# ThunderPhone Full Site Context ThunderPhone is a voice AI platform for production phone agents. The public website explains why integrated voice AI architecture matters: phone calls fail when systems mishear callers, lose audio nuance, follow scripts poorly, or require expensive manual setup. ThunderPhone positions itself as a lower-cost, more reliable alternative with pricing from 2 cents per minute. ## Product Positioning ThunderPhone combines caller audio understanding, model routing, LLM reasoning, speech output, telephony, testing, monitoring, and integrations in one stack. The main claim is that this integrated architecture can hear callers more accurately, follow instructions more reliably, and cost less than call centers or component-based voice AI tools. ## Core Capabilities - AI phone agents for inbound and outbound calls. - Real telephony, SIP trunking, web widget, app, and API deployment paths. - Spark, Bolt, and Storm intelligence tiers. - Multiple ASR/transcription paths plus direct audio-to-LLM input. - Thinking and non-thinking model routing for speed and instruction following. - Test calls, automated scenario testing, monitoring, issue detection, and reporting. - Integrations through a guided platform workflow and API access. - 47 languages with multilingual call handling. - Compliance-oriented features including BAA and DPA support. ## Public Pages ## Voice AI that nails the calls others fumble. URL: https://thunderphone.com/ Title: ThunderPhone: AI Phone Agents Description: Voice AI that nails the calls others fumble, on one integrated stack from 2 cents per minute. Summary: ThunderPhone is an integrated voice AI stack for reliable, low-cost phone agents that hear callers correctly, follow instructions, and run across phone, web, and app channels. ## Integrated voice AI architecture URL: https://thunderphone.com/technology Title: Technology | ThunderPhone Description: How ThunderPhone uses an integrated voice AI architecture to improve audio understanding, instruction following, latency, and price. Summary: Explains ThunderPhone audio understanding, model routing, instruction following, benchmark performance, speech-to-speech tradeoffs, and enterprise extensions. ## The control room for AI calls. URL: https://thunderphone.com/platform Title: Platform | ThunderPhone Description: Set up, test, monitor, and improve production AI voice agents from one ThunderPhone control room. Summary: Shows the ThunderPhone platform for building agents, choosing voices and intelligence tiers, connecting SIP and integrations, running tests, and monitoring production calls. ## Simple per-minute pricing URL: https://thunderphone.com/pricing Title: Pricing | ThunderPhone Description: ThunderPhone pricing starts at 2 cents per minute with no platform fee and three simple intelligence tiers. Summary: Details Spark, Bolt, and Storm pricing, surcharges, premium voices, language support, and comparisons against human call centers and other voice AI platforms. ## Enterprise voice AI implementation URL: https://thunderphone.com/enterprise Title: Enterprise Voice AI | ThunderPhone Description: Enterprise voice AI implementation, customization, compliance, data residency, and high-volume cost optimization. Summary: Describes enterprise deployments, implementation support, custom integrations, data residency, compliance, ThunderHuman, interpreting, and high-volume optimization. ## White-label AI interpreting for LSPs URL: https://thunderphone.com/interpreting Title: AI Interpreting for LSPs | ThunderPhone Description: White-label AI interpreting for language service providers: dedicated numbers per language pair, 47 languages at full quality, and compliance options. Summary: Describes ThunderPhone Interpreting, the white-label over-the-phone interpreting platform for LSPs: dedicated numbers per language pair, the TranslateMyCall public demo line, language coverage, per-minute economics, and compliance options. ## Bring your agents to ThunderPhone URL: https://thunderphone.com/import Title: Import Your Agents from Vapi, Retell, ElevenLabs, or Bland | ThunderPhone Description: Move your voice agents to ThunderPhone in one sitting: paste an API key or a JSON export, review the mapped agents, tools, and knowledge bases, and import. Summary: Explains the ThunderPhone agent importer for Vapi, Retell, ElevenLabs Agents, and Bland: what is fetched, how prompts, voices, tools, and knowledge are mapped, what needs a manual step, and how the vendor key is handled. ## Generations of voice AI URL: https://thunderphone.com/generations-of-voice-ai Title: Generations of Voice AI | ThunderPhone Description: A scrollable look at why automated phone calls have felt clumsy, and what changes with newer voice AI architecture. Summary: Explains the evolution from brittle phone trees and scripted bots to integrated voice AI systems that can understand audio and follow instructions. ## Privacy Policy URL: https://thunderphone.com/privacy Title: Privacy Policy | ThunderPhone Description: How ThunderPhone collects, uses, shares, and retains website, account, analytics, and customer call data. Summary: Covers website, account, analytics, call data, retention, subprocessors, privacy rights, and consent-gated tracking. ## Terms of Service URL: https://thunderphone.com/terms Title: Terms of Service | ThunderPhone Description: The terms for using ThunderPhone, including service usage, payment, customer data, calling-law compliance, and disputes. Summary: Sets out ThunderPhone service terms, payment, acceptable use, customer data, calling-law compliance, disclaimers, and dispute terms. ## Cookie Policy URL: https://thunderphone.com/cookies Title: Cookie Policy | ThunderPhone Description: ThunderPhone cookie and storage policy, including essential storage, consent-gated analytics, and product diagnostics. Summary: Explains essential cookies, consent-gated analytics, product diagnostics, and cookie settings for ThunderPhone. ## Data Processing URL: https://thunderphone.com/dpa Title: Data Processing | ThunderPhone Description: ThunderPhone data processing, subprocessors, DPA, BAA, retention, residency, and security measures. Summary: Summarizes ThunderPhone data processing, subprocessors, security, retention, BAA, DPA, and data residency terms. ## Security & Compliance URL: https://thunderphone.com/security Title: Security & Compliance | ThunderPhone Description: ThunderPhone supports HIPAA and GDPR compliance with documented controls, automated monitoring, and continuous policy enforcement for healthcare voice AI. Summary: ThunderPhone HIPAA and GDPR compliance posture, security controls, active policies, and vendor BAA status. ## Solutions Pages Hub pages for the solutions content families: - [Industries](https://thunderphone.com/industries) - [Compare](https://thunderphone.com/compare) - [Alternatives](https://thunderphone.com/alternatives) - [Guides](https://thunderphone.com/guides) - [Languages](https://thunderphone.com/languages) - [Glossary](https://thunderphone.com/glossary) - [Use cases](https://thunderphone.com/use-cases) - [Integrations](https://thunderphone.com/integrations) ### Industries - [AI Phone Agents for Accounting Firms](https://thunderphone.com/ai-phone-agents-for-accounting-firms): Capture new-client inquiries, schedule consultations, survive the tax-season ring storm, and run document and deadline reminder campaigns — without the agent ever giving tax advice. - [AI Phone Agents for Auto Repair Shops and Service Departments](https://thunderphone.com/ai-phone-agents-for-auto-services): Book service appointments, run status and ready-for-pickup calls, relay estimates for approval, and capture breakdown calls with a multilingual AI phone agent. - [AI Phone Agents for Car Dealerships](https://thunderphone.com/ai-phone-agents-for-car-dealerships): Answer inventory calls, book test drives, call internet leads back in minutes, and capture trade-in details with a multilingual AI phone agent for dealership sales and BDC teams. - [AI Phone Agents for Childcare Centers](https://thunderphone.com/ai-phone-agents-for-childcare-centers): Answer parent calls, capture enrollment inquiries, schedule tours, take absence reports, and route sensitive questions to staff with a multilingual AI phone agent. - [AI Phone Agents for Cleaning Services](https://thunderphone.com/ai-phone-agents-for-cleaning-services): Answer cleaning-company calls, capture new-lead details, book estimates and recurring visits, and route complaints with a multilingual AI phone agent. - [AI Phone Agents for Dental Offices](https://thunderphone.com/ai-phone-agents-for-dental-offices): Answer dental calls, book appointments, handle routine questions, and route urgent patients with a multilingual AI phone agent. - [AI Phone Agents for Dermatology Practices](https://thunderphone.com/ai-phone-agents-for-dermatology): Fill cancelled slots from the waitlist, capture referrals, run urgent-lesion scripts, schedule biopsy-result callbacks, and handle recall outreach for annual skin checks with a multilingual AI phone agent. - [AI Phone Agents for Driving Schools](https://thunderphone.com/ai-phone-agents-for-driving-schools): Answer enrollment calls, book and reschedule lessons, explain packages, and handle parent questions with a multilingual AI phone agent for driving schools. - [AI Phone Agents for E-commerce](https://thunderphone.com/ai-phone-agents-for-ecommerce): Answer order-status calls from connected order data, start returns per your policy, handle product and shipping questions, and support customers in 47 languages. - [AI Phone Agents for Tutoring Centers](https://thunderphone.com/ai-phone-agents-for-tutoring-centers): Answer parent calls, capture enrollment inquiries, schedule assessments and make-up sessions, and route questions to instructors with a multilingual AI phone agent. - [AI Phone Agents for Equipment Rental](https://thunderphone.com/ai-phone-agents-for-equipment-rental): Answer availability calls, take reservations, schedule deliveries and off-rents, and escalate breakdowns to dispatch with a multilingual AI phone agent. - [AI Phone Agents for Event Venues](https://thunderphone.com/ai-phone-agents-for-event-venues): Qualify event inquiries, schedule tours, check date availability, coordinate vendors, and call consented web leads back automatically with a multilingual AI phone agent. - [AI Phone Agents for Financial Advisors](https://thunderphone.com/ai-phone-agents-for-financial-advisors): Capture prospect calls, schedule and confirm client meetings, take structured service requests, and run event RSVPs with an AI phone agent that never gives investment advice. - [AI Phone Agents for Funeral Homes](https://thunderphone.com/ai-phone-agents-for-funeral-homes): Every call answered by a calm, unhurried voice at any hour — first calls gathered gently and handed to the on-call director, routine questions answered from the home's own words. - [AI Phone Agents for Golf Courses](https://thunderphone.com/ai-phone-agents-for-golf-courses): Answer tee-time calls, book through your connected tee sheet, capture outing and membership inquiries, and handle frost-delay mornings with a multilingual AI phone agent. - [AI Phone Agents for Gyms and Fitness Studios](https://thunderphone.com/ai-phone-agents-for-gyms-and-fitness-studios): Answer membership calls, book tours and classes, follow up on web leads, and route freeze or billing requests with a multilingual AI phone agent. - [AI Phone Agents for Home Health Care](https://thunderphone.com/ai-phone-agents-for-home-health-care): Capture referrals on the first ring, handle caregiver call-outs, confirm visits, and route urgent calls by agency-defined rules with a multilingual AI phone agent. - [AI Phone Agents for Home Service Businesses](https://thunderphone.com/ai-phone-agents-for-home-services): Answer service calls, qualify jobs, schedule visits, capture after-hours leads, and transfer urgent work with an AI phone agent. - [AI Phone Agents for Hotels & Hospitality](https://thunderphone.com/ai-phone-agents-for-hotels): Answer reservation calls, route guest requests, confirm arrivals, and serve international guests in 47 languages with an AI phone agent for hotels. - [AI Phone Agents for Insurance Agencies](https://thunderphone.com/ai-phone-agents-for-insurance-agencies): Capture quote requests, take first notice of loss, route policy-service calls, and run renewal outreach with an AI phone agent that always hands licensed work to licensed staff. - [AI Phone Agents for IT Services and MSPs](https://thunderphone.com/ai-phone-agents-for-it-services): Answer help-desk calls, triage severity by your written rules, create structured tickets, page on-call engineers, and keep clients informed with an AI phone agent. - [AI Phone Agents for Law Firms](https://thunderphone.com/ai-phone-agents-for-law-firms): Qualify new inquiries, capture consistent intake details, route urgent matters, and answer routine calls without turning legal intake into a phone queue. - [AI Phone Agents for Locksmiths](https://thunderphone.com/ai-phone-agents-for-locksmiths): Answer lockout calls while you're on a job, capture location and vehicle details, quote only your configured prices, and dispatch urgent work with a multilingual AI phone agent. - [AI Phone Agents for Logistics, Freight Brokerages, and 3PLs](https://thunderphone.com/ai-phone-agents-for-logistics): Run carrier check calls at scale, answer shipper status inquiries, intake detention and lumper reports, and hold on warehouse lines with an AI phone agent. - [AI Phone Agents for Med Spas](https://thunderphone.com/ai-phone-agents-for-med-spas): Book consultations by treatment type, run intake with your screening questions, confirm appointments, fill cancellations, and check in after treatments with a multilingual AI phone agent. - [AI Phone Agents for Medical Clinics](https://thunderphone.com/ai-phone-agents-for-medical-clinics): Answer patient calls, schedule visits, take refill requests, run reminder and recall outreach, and escalate urgent callers by clinic-defined rules with a multilingual AI phone agent. - [AI Phone Agents for Mortgage Brokers](https://thunderphone.com/ai-phone-agents-for-mortgage-brokers): Capture mortgage inquiries, schedule loan-officer calls, send document reminders, and route application-status questions with a multilingual AI phone agent. - [AI Phone Agents for Moving Companies](https://thunderphone.com/ai-phone-agents-for-moving-companies): Capture quote requests, schedule surveys, confirm bookings, coordinate move day, and handle claims intake with an AI phone agent for movers and storage companies. - [AI Phone Agents for Optometrists](https://thunderphone.com/ai-phone-agents-for-optometrists): Answer eye-care calls, book exams, handle glasses and contact-lens order questions, and route urgent symptoms with a multilingual AI phone agent. - [AI Phone Agents for Pest Control Companies](https://thunderphone.com/ai-phone-agents-for-pest-control): Answer after-hours pest calls, qualify new jobs, book inspections, manage recurring visits, and cover seasonal surges with a multilingual AI phone agent. - [AI Phone Agents for Pharmacies](https://thunderphone.com/ai-phone-agents-for-pharmacies): Take refill requests, place prescription-ready and pickup-reminder calls, answer hours and insurance questions, and route every medication question to the pharmacist with a multilingual AI phone agent. - [AI Phone Agents for Physical Therapy Clinics](https://thunderphone.com/ai-phone-agents-for-physical-therapy): Book evaluations and visit series, run plan-of-care and intake-form reminders, backfill cancellations from the waitlist, collect workers'-comp intake fields, and route clinical questions to clinicians with a multilingual AI phone agent. - [AI Phone Agents for Property Management](https://thunderphone.com/ai-phone-agents-for-property-management): Route maintenance requests, answer resident questions, follow up on work orders, and escalate property emergencies with an AI phone agent. - [AI Phone Agents for Property Restoration](https://thunderphone.com/ai-phone-agents-for-property-restoration): Answer emergency loss calls 24/7, capture structured intake, escalate to on-call technicians, and route adjuster calls with a multilingual AI phone agent. - [AI Phone Agents for Real Estate](https://thunderphone.com/ai-phone-agents-for-real-estate): Answer sign calls and listing inquiries, schedule showings, call back web leads in minutes, and run consent-based outreach for real estate brokerages, teams, and agents. - [AI Phone Agents for Restaurants](https://thunderphone.com/ai-phone-agents-for-restaurants): Answer reservation calls, quote wait policies, capture takeout and event inquiries, and confirm bookings with a multilingual AI phone agent. - [AI Phone Agents for Salons and Spas](https://thunderphone.com/ai-phone-agents-for-salons-and-spas): Book appointments by service and provider, fill cancellations from the waitlist, confirm tomorrow's schedule, and answer menu questions with a multilingual AI phone agent. - [AI Phone Agents for Self-Storage](https://thunderphone.com/ai-phone-agents-for-self-storage): Answer unit-availability and sizing questions, take rental inquiries, schedule move-ins, and handle gate-access calls with an AI phone agent. - [AI Phone Agents for Senior Living Communities](https://thunderphone.com/ai-phone-agents-for-senior-living): Answer family inquiries warmly, schedule tours, support admissions intake, and route resident-family calls to staff with a multilingual AI phone agent for independent living, assisted living, and memory care. - [AI Phone Agents for Solar Installers](https://thunderphone.com/ai-phone-agents-for-solar-installers): Answer solar leads while crews are on roofs, qualify inquiries, schedule site surveys, give project-status updates, and handle service calls with a multilingual AI phone agent. - [AI Phone Agents for Staffing and Recruiting Agencies](https://thunderphone.com/ai-phone-agents-for-staffing-agencies): Capture applications, ask the agency's own screening questions, fill open shifts by calling the available-worker list, and keep placed workers confirmed—without making a single hiring judgment. - [AI Phone Agents for Therapy Practices](https://thunderphone.com/ai-phone-agents-for-therapy-practices): Answer new-client inquiries, manage waitlists and scheduling, route insurance and superbill questions, and capture after-hours messages for a counseling practice — with a practice-configured crisis response placed first in the intended call flow. - [AI Phone Agents for Towing Companies](https://thunderphone.com/ai-phone-agents-for-towing-companies): Answer stranded callers 24/7, capture dispatch-ready location and vehicle details, handle impound-release questions, and route unsafe situations with a multilingual AI phone agent. - [AI Phone Agents for Travel Agencies](https://thunderphone.com/ai-phone-agents-for-travel-agencies): Qualify trip inquiries, schedule advisor consultations, run payment and pre-departure reminder calls, and cover after-hours in 47 languages with an AI phone agent. - [AI Phone Agents for Veterinary Clinics](https://thunderphone.com/ai-phone-agents-for-veterinary-clinics): Answer veterinary calls, book appointments, take refill requests, run reminder campaigns, and route emergencies with a multilingual AI phone agent. ### Comparisons, Alternatives & Guides - [Voice AI language support compared: ThunderPhone vs. Retell vs. Vapi vs. Bland](https://thunderphone.com/compare/voice-ai-language-support): How ThunderPhone, Retell AI, Vapi, and Bland AI actually count supported languages — published catalogs, provider ceilings, switching behavior, and a buyer checklist, verified August 2026. - [How to compare voice AI performance — and what ThunderPhone publishes](https://thunderphone.com/compare/voice-ai-performance): Why voice AI performance claims are hard to compare, what ThunderPhone publishes and lets you audit, and how to run your own apples-to-apples evaluation. - [Voice AI platform features compared: testing, monitoring, telephony, and integrations — ThunderPhone vs. Retell vs. Vapi vs. Bland](https://thunderphone.com/compare/voice-ai-platform-features): A feature-by-feature comparison of ThunderPhone, Retell AI, Vapi, and Bland AI across testing, monitoring, telephony, call handling, and integrations, verified against public sources as of August 2026. - [Voice AI pricing compared (2026): ThunderPhone vs. Retell vs. Vapi vs. Bland per-minute costs](https://thunderphone.com/compare/voice-ai-pricing): A buyer's guide to voice AI pricing models — all-in engine rates, component pricing, hosting plus pass-through, and tiered bundles — with a normalized 10,000-minute scenario, verified August 2026. - [Retell vs. Vapi vs. Bland vs. ElevenLabs (2026): pricing, languages, and compliance compared](https://thunderphone.com/compare/retell-vs-vapi-vs-bland-vs-elevenlabs): A side-by-side roundup of Retell AI, Vapi, Bland AI, and ElevenLabs Agents — pricing models, languages, telephony, compliance, and testing — with a normalized 10,000-minute scenario, verified August 2026. - [Smith.ai vs. Goodcall: an AI receptionist comparison](https://thunderphone.com/compare/smith-ai-vs-goodcall): A side-by-side look at Smith.ai's hybrid AI-plus-human receptionist and Goodcall's flat-rate AI phone agent — pricing units, features, and compliance postures — with a pay-per-minute platform alternative, verified September 2026. - [ThunderPhone vs. Bland AI: pricing, deployment, compliance, and testing](https://thunderphone.com/compare/thunderphone-vs-bland): Compare verified ThunderPhone and Bland AI pricing, language coverage, SIP options, compliance posture, and testing tooling as of August 2026. - [ThunderPhone vs. building your own AI phone agent: the build-vs-buy decision](https://thunderphone.com/compare/thunderphone-vs-building-your-own): What rolling your own voice agent on LiveKit Agents or Pipecat actually requires — providers, telephony, hosting, testing, maintenance — versus ThunderPhone's published 2¢/5¢/9¢ per-minute rates, as of August 2026. - [ThunderPhone vs. ElevenLabs Agents: pricing, telephony, compliance, and testing](https://thunderphone.com/compare/thunderphone-vs-elevenlabs): Compare verified ThunderPhone and ElevenLabs Agents pricing, language coverage, SIP options, compliance posture, and testing tooling as of August 2026. - [ThunderPhone vs. Goodcall: pricing, phone numbers, languages, and compliance](https://thunderphone.com/compare/thunderphone-vs-goodcall): Compare ThunderPhone and Goodcall pricing units, phone-number options, languages, workflows, integrations, compliance posture, and testing depth for buyers. - [ThunderPhone vs. LiveKit Cloud (2026): pricing, telephony, and what each side manages](https://thunderphone.com/compare/thunderphone-vs-livekit): Compare ThunderPhone's hosted phone-agent platform with LiveKit Cloud running LiveKit Agents: pricing, telephony, compliance, testing, and what each side manages, verified August 2026. - [ThunderPhone vs. Phonely: pricing, telephony, compliance, and testing](https://thunderphone.com/compare/thunderphone-vs-phonely): Compare verified ThunderPhone and Phonely pricing, tier limits, language coverage, SIP options, compliance posture, and testing tooling as of August 2026. - [ThunderPhone vs. Pipecat Cloud (2026): pricing, hosting, and what each side manages](https://thunderphone.com/compare/thunderphone-vs-pipecat): Compare ThunderPhone's hosted phone-agent platform with Pipecat Cloud's managed hosting for Pipecat agents — pricing structure, telephony, compliance, and testing, verified August 2026. - [ThunderPhone vs. Retell AI: pricing, telephony, compliance, and testing](https://thunderphone.com/compare/thunderphone-vs-retell): Compare verified ThunderPhone and Retell AI pricing, language coverage, SIP options, compliance posture, and testing tooling as of August 2026. - [ThunderPhone vs. Smith.ai: pricing, human backup, telephony, and compliance](https://thunderphone.com/compare/thunderphone-vs-smith-ai): Compare ThunderPhone and Smith.ai pricing units, live human backup, telephony, languages, compliance posture, integrations, and testing workflows. - [ThunderPhone vs. Thoughtly: pricing, GTM workflows, telephony, and compliance](https://thunderphone.com/compare/thunderphone-vs-thoughtly): Compare ThunderPhone and Thoughtly pricing transparency, GTM workflows, telephony, languages, APIs, testing, integrations, and compliance posture for buyers. - [ThunderPhone vs. Vapi: pricing, languages, SIP, compliance, and testing](https://thunderphone.com/compare/thunderphone-vs-vapi): Compare verified ThunderPhone and Vapi pricing, language coverage, SIP options, compliance posture, and testing tooling as of August 2026. - [Air AI alternatives (2026): working AI phone-call platforms compared](https://thunderphone.com/alternatives/air-ai): Air AI settled an FTC action in March 2026 and its domain now serves an unrelated company. Verified, sourced alternatives for AI phone agents: ThunderPhone, Retell, Vapi, and Bland. - [Bland AI alternatives (2026): verified pricing and platform comparison](https://thunderphone.com/alternatives/bland): Five Bland AI alternatives for AI phone agents, compared on verified published pricing, tier limits, compliance posture, and telephony options as of August 2026. - [ElevenLabs Agents alternatives (2026): five platforms compared on published pricing and docs](https://thunderphone.com/alternatives/elevenlabs-agents): A sourced look at ElevenLabs conversational AI alternatives — ThunderPhone, Retell AI, Vapi, Bland AI, and Phonely — compared on published pricing, telephony, compliance, and testing. - [Goodcall alternatives (2026): compare pricing, phone setup, and platform control](https://thunderphone.com/alternatives/goodcall): Compare Goodcall alternatives across caller-based pricing, phone setup, languages, integrations, compliance posture, testing tools, and buyer fit. - [Phonely alternatives (2026): five platforms compared on published pricing and docs](https://thunderphone.com/alternatives/phonely): A sourced look at Phonely alternatives — ThunderPhone, Retell AI, Vapi, Bland AI, and ElevenLabs Agents — compared on published pricing, tier limits, telephony, compliance, and testing. - [Retell AI alternatives (2026): five platforms compared on published pricing and docs](https://thunderphone.com/alternatives/retell): A sourced look at Retell AI alternatives — ThunderPhone, Vapi, Bland AI, ElevenLabs Agents, and Phonely — compared on published pricing, telephony, compliance, and testing. - [Smith.ai alternatives (2026): AI receptionists compared on pricing, human backup, and platform depth](https://thunderphone.com/alternatives/smith-ai): Compare Smith.ai alternatives across pricing, human backup, telephony, languages, integrations, compliance posture, testing depth, and buyer fit. - [Synthflow alternatives for self-serve voice AI buyers (2026)](https://thunderphone.com/alternatives/synthflow): Synthflow's public pricing now starts at $30,000/year with no self-serve tiers. Verified self-serve alternatives: ThunderPhone, Retell, Vapi, Bland, and Phonely. - [Thoughtly alternatives (2026): compare pricing, channels, CRM depth, and testing](https://thunderphone.com/alternatives/thoughtly): Compare Thoughtly alternatives for pricing transparency, channels, CRM workflows, telephony, languages, compliance posture, testing depth, and buyer fit. - [Vapi alternatives (2026): 5 voice-agent platforms compared on pricing, compliance, and testing](https://thunderphone.com/alternatives/vapi): A sourced look at ThunderPhone, Retell, Bland, ElevenLabs Agents, and Phonely as Vapi alternatives, with published pricing and compliance facts as of August 2026. - [AI call quality assurance: grade every call, then verify the grader](https://thunderphone.com/guides/ai-call-quality-assurance): QA for AI phone agents — why grading every call beats sampling, how automatic issue detection clusters failures into patterns, what makes a rubric work, and where LLM-judged QA needs humans in the loop. - [How much does an AI phone agent cost in 2026? The five pricing models, explained](https://thunderphone.com/guides/ai-phone-agent-cost): A buyer's guide to AI phone agent pricing — all-in per-minute, component-based, hosting plus pass-through, bundled tiers, and per-agent or per-call plans — with a worked 10,000-minute month and a TCO checklist, verified August 2026. - [Audio codecs on phone calls: G.711, G.722, and Opus, explained](https://thunderphone.com/guides/audio-codecs-explained): Phone-call codecs turn sampled speech into transportable bits; G.711 favors simplicity, G.722 wider speech bandwidth, and Opus adaptive efficiency. - [Best AI answering service: nine options for 24/7 and overflow calls](https://thunderphone.com/guides/best-ai-answering-service): Compare nine AI answering services for after-hours coverage, overflow, routing, human backup, phone setup, fit, and published pricing as of August 2026. - [Best AI receptionist software: nine options compared for 2026](https://thunderphone.com/guides/best-ai-receptionist-software): Compare nine AI receptionist options for buyers by service model, published pricing, phone setup, testing, languages, and human backup as of August 2026. - [Bland AI pricing (2026): per-minute tiers, platform fees, and what 10,000 minutes costs](https://thunderphone.com/guides/bland-pricing): How Bland AI's tiered per-minute pricing works — talk rates, platform fees, transfer minutes, daily-call and concurrency limits — with a worked 10,000-minute month from published numbers, verified August 2026. - [Where the milliseconds go: latency in AI phone calls](https://thunderphone.com/guides/call-latency-explained): AI call latency is the accumulated time for capture, transport, turn detection, recognition, response generation, speech synthesis, and playback. - [The cheapest AI receptionist in 2026: subscriptions, per-call plans, and usage pricing compared](https://thunderphone.com/guides/cheapest-ai-receptionist): What an AI receptionist costs across pricing models, with a worked 300-call small-business month — verified September 2026. - [The cheapest AI voice agent in 2026: published per-minute prices, compared](https://thunderphone.com/guides/cheapest-ai-voice-agent): Published complete voice AI rates run roughly from 2¢ to $0.31 per minute. This guide compares managed platforms and the DIY floor from vendor list prices, verified September 2026. - [Client portals for AI call reporting: white-label visibility without dashboard access](https://thunderphone.com/guides/client-portals-for-ai-call-reporting): How agencies and service providers running AI phone agents for many clients use white-label client reporting portals — what a portal shows and hides, branding, viewer access models, read-only scope discipline, and consent inheritance. - [ElevenLabs Agents pricing (2026): tiers, the $0.08/minute overage, and what is billed on top](https://thunderphone.com/guides/elevenlabs-agents-pricing): How ElevenLabs conversational AI pricing works — subscription tiers with included call minutes, the flat $0.08/minute overage, burst pricing, and the LLM and telephony costs billed separately on top — verified August 2026. - [Free AI phone agents in 2026: real free tiers, trial credits, and what they include](https://thunderphone.com/guides/free-ai-phone-agent): Which voice-AI platforms have a genuine free tier versus trial credits, what each includes, and what the price becomes afterward, verified September 2026. - [Choosing a GDPR-compliant AI phone agent: a buyer's guide](https://thunderphone.com/guides/gdpr-compliant-ai-phone-agent): What GDPR means for AI phone agents — recordings, transcripts, controller and processor roles — plus what to look for in a platform and how major vendors publicly describe their GDPR posture. - [Goodcall pricing (2026): per-agent plans, what counts as a unique customer, and a worked example](https://thunderphone.com/guides/goodcall-pricing): Goodcall's $79/$129/$249 per-agent plans, the unique-customer meter, the $0.50 overage, and a worked example with the arithmetic shown; verified September 2026. - [HD voice, explained: what it is and when calls actually get it](https://thunderphone.com/guides/hd-voice-explained): HD voice is wideband calling that preserves more speech frequencies, but callers hear it only when the negotiated path stays wideband end to end. - [HIPAA compliant AI phone agents: what the label means and how to evaluate one](https://thunderphone.com/guides/hipaa-compliant-ai-phone-agent): A buyer's guide to HIPAA and AI phone agents: why voice AI touches PHI, what a BAA does and does not cover, how ThunderPhone and other platforms describe their posture, and an evaluation checklist for healthcare teams. - [How AI phone agents work: the full pipeline, explained](https://thunderphone.com/guides/how-ai-phone-agents-work): An AI phone agent is a real-time speech system that connects telephony, transcription, dialogue logic, tools, and synthesized audio in one call. - [How call transfers actually work: SIP REFER, bridging, warm and cold](https://thunderphone.com/guides/how-call-transfers-work): Call transfers either redirect a SIP dialog or create and bridge a second call leg, with different behavior for consultation, failure, media, and control. - [Caller ID, CNAM, and why calls get labeled "Spam Likely"](https://thunderphone.com/guides/how-caller-id-and-spam-labeling-work): Caller ID combines a calling number, optional name data, cryptographic verification, and carrier reputation systems that can independently change the display. - [How voice agents take actions mid-call: function calling, explained](https://thunderphone.com/guides/how-function-calling-works-on-live-calls): Function calling lets a voice agent request a typed operation during a call while an application validates, executes, and returns the result for speech. - [How voice agents ground answers: knowledge bases and RAG on calls](https://thunderphone.com/guides/how-knowledge-grounding-works): Voice agents ground answers by retrieving relevant approved passages for each turn, then constraining the response to that evidence and call context. - [How number porting works: LOAs, FOC dates, and timelines](https://thunderphone.com/guides/how-number-porting-works): Number porting moves a phone number between carriers through authorization, record validation, an accepted order, and a coordinated routing cutover. - [How a phone call works: from dial to audio, PSTN to VoIP](https://thunderphone.com/guides/how-phone-calls-work): A phone call uses signaling to resolve a dialed number and establish a session, then carries audio over circuit or packet paths until teardown. - [How SIP trunking works](https://thunderphone.com/guides/how-sip-trunking-works): A SIP trunk is an IP connection that uses signaling to establish phone sessions and negotiated media streams to carry calls between systems. - [How speech recognition works on phone calls](https://thunderphone.com/guides/how-speech-recognition-works-on-calls): Call speech recognition turns a compressed audio stream into evolving text by extracting acoustic features, decoding tokens, and finalizing stable words. - [How text-to-speech works in real-time calls](https://thunderphone.com/guides/how-text-to-speech-works): Real-time text-to-speech normalizes response text, predicts pronunciation and prosody, generates a waveform, and streams encoded audio into the call. - [How to cut your voice AI bill: nine levers that actually move the per-minute price](https://thunderphone.com/guides/how-to-reduce-voice-ai-costs): Practical cost levers — comparing complete rates, call-length discipline, prompt size, tier routing, hold and voicemail policy, transfer strategy, concurrency, telephony, and testing budgets — verified September 2026. - [How to test a voice agent before it answers real calls](https://thunderphone.com/guides/how-to-test-voice-agents): Voice-agent testing must cover conversation policy, audio and turn timing, tool side effects, telephony, integrations, and safe recovery together. - [How voicemail and answering machine detection works](https://thunderphone.com/guides/how-voicemail-detection-works): Voicemail detection classifies post-answer audio from speech, silence, cadence, and tones, then waits for a safe point to leave a message or hang up. - [How webhooks carry call events to your systems](https://thunderphone.com/guides/how-webhooks-work-for-calls): Call webhooks are signed HTTP callbacks that report lifecycle events, while retries and receiver-side deduplication bridge calls to business systems. - [How browser calls work: WebRTC from mic to phone network](https://thunderphone.com/guides/how-webrtc-browser-calls-work): A browser call captures microphone audio, secures and transports it with WebRTC, then crosses a media gateway when it must reach the phone network. - [Live call monitoring for AI voice agents: listen, whisper, step in](https://thunderphone.com/guides/live-call-monitoring): How live oversight of AI phone calls works — silent listen-in, private whisper guidance the caller never hears, joining and escalation — and when it beats after-the-fact review. - [How to migrate from Bland to ThunderPhone (2026): import agents, tools, and pathways](https://thunderphone.com/guides/migrate-from-bland-to-thunderphone): Step-by-step: get a Bland API key, run the ThunderPhone importer, review mapped agents and pathways, and finish numbers and credentials. - [How to migrate from ElevenLabs Agents to ThunderPhone (2026): import agents, tools, and knowledge bases](https://thunderphone.com/guides/migrate-from-elevenlabs-agents-to-thunderphone): Step-by-step: get an ElevenLabs API key, run the ThunderPhone importer, review mapped content, and finish numbers, tools, and credentials. - [How to migrate from Retell to ThunderPhone (2026): import agents, tools, and knowledge bases](https://thunderphone.com/guides/migrate-from-retell-to-thunderphone): Step-by-step: get a Retell API key, run the ThunderPhone importer, review mapped content, and finish numbers, webhooks, and credentials. - [How to migrate from Vapi to ThunderPhone (2026): import assistants, tools, and knowledge bases](https://thunderphone.com/guides/migrate-from-vapi-to-thunderphone): Step-by-step: get a Vapi private key, run the ThunderPhone importer, review mapped content, and finish numbers, webhooks, and credentials. - [The most accurate voice AI: what's actually measurable, and the one auditable number](https://thunderphone.com/guides/most-accurate-voice-ai): Why 'most accurate' has no standardized answer, how WER differs from task accuracy, the auditable 99.4% Big Bench Audio result, and how to run your own evaluation — September 2026. - [The most reliable voice AI: six things you can actually verify before you buy](https://thunderphone.com/guides/most-reliable-voice-ai): No standardized reliability ranking exists for voice AI — here are the verifiable signals: public status history, automated failure detection, regression testing, live supervision, alerting, and delivery guarantees — September 2026. - [How multilingual voice agents switch languages mid-call](https://thunderphone.com/guides/multilingual-voice-ai-explained): Multilingual voice agents detect a caller's language from streaming speech, update a controlled language state, and answer with matching recognition and speech. - [Phonely pricing (2026): tiers, included minutes, overage rates, and a 10,000-minute example](https://thunderphone.com/guides/phonely-pricing): How Phonely's subscription pricing works — the free 100 minutes, $50 Starter and $150 Pro tiers, annual discounts, per-minute overage rates, and a worked 10,000-minute example — verified September 2026. - [Pipecat Cloud pricing (2026): agent hosting rates, what's passed through, and a 10,000-minute example](https://thunderphone.com/guides/pipecat-cloud-pricing): Pipecat Cloud hosting and reserved rates, telephony and recording add-ons, what your AI providers bill, and a 10,000-minute example — verified September 2026. - [Prompt engineering for voice agents: what's different about the phone](https://thunderphone.com/guides/prompt-engineering-for-voice-agents): Voice-agent prompts must control a real-time, interruptible conversation with uncertain transcripts, tool side effects, and no visible interface. - [Retell AI pricing (2026): per-minute components, add-ons, and a 10,000-minute example](https://thunderphone.com/guides/retell-pricing): How Retell AI's component-based pricing works — the $0.055/minute voice infra base, LLM and voice rates stacked on top, telephony, add-ons, and a worked 10,000-minute example computed entirely from Retell's published numbers — verified August 2026. - [Smith.ai pricing (2026): AI receptionist per-call rates vs. human receptionist plans, with a worked example](https://thunderphone.com/guides/smith-ai-pricing): Smith.ai's per-call AI receptionist tiers ($0–$800/mo, $3 overage) and $300–$2,100 human plans, with a 2,000-call worked example — verified September 2026. - [Synthflow pricing (2026): enterprise-only plans, what's published, and how to budget a 10,000-minute month](https://thunderphone.com/guides/synthflow-pricing): Synthflow lists an Enterprise plan from $30,000/year, no per-minute rate: what's public, what to ask sales, and a 10,000-minute budget, verified September 2026. - [Telnyx voice AI pricing (2026): what the $0.05/minute rate covers and what bills on top](https://thunderphone.com/guides/telnyx-voice-ai-pricing): How Telnyx's voice-AI agent pricing works — the $0.05/minute orchestration+STT+TTS rate, separately billed LLM tokens and telephony, tiers, and a worked example — verified September 2026. - [Thoughtly pricing (2026): plans, per-minute rates, add-ons, and a 10,000-minute example](https://thunderphone.com/guides/thoughtly-pricing): How Thoughtly's Flex, Scale, and Enterprise plans are priced, what is published versus quoted, and a 10,000-minute worked example — verified September 2026. - [ThunderPhone pricing (2026): 2¢, 5¢, and 9¢ per-minute engine rates, add-ons, and monthly examples](https://thunderphone.com/guides/thunderphone-pricing): Complete ThunderPhone rates with speech recognition, language model, and voice in one number; pay as you go with no subscription, plus worked examples verified September 2026. - [How ThunderPhone keeps agents reliable: status, self-detection, and testing like software](https://thunderphone.com/guides/thunderphone-reliability): ThunderPhone's reliability machinery — the public status page, automatic issue detection with AI-drafted fixes, simulations and release gates, validation sets, live supervision, alerts, and signed webhooks — September 2026. - [Turn-taking, endpointing, and barge-in: how voice agents know when to speak](https://thunderphone.com/guides/turn-taking-and-interruptions-explained): Voice agents coordinate listening and speaking with speech detection, endpoint rules, streaming transcripts, playback state, and interruption handling. - [Vapi pricing (2026): what the $0.05/minute hosting rate includes and what bills on top](https://thunderphone.com/guides/vapi-pricing): How Vapi's hosting-plus-pass-through pricing works — the Build plan's $0.05/minute call hosting, provider costs billed at cost, compliance add-ons, and why the complete per-minute price can't be computed from the public pages — verified August 2026. - [Voice agent observability: catching failures that never throw an error](https://thunderphone.com/guides/voice-agent-observability): AI phone agents fail as drifting success rates, not exceptions. A useful observability surface separates failure classes, keeps honest denominators, attributes numbers to agents, and discloses sampling. - [Voice agent regression testing: catching the behaviors a prompt edit silently changed](https://thunderphone.com/guides/voice-agent-regression-testing): How to build and maintain a regression suite for AI phone agents — scenario design, pass-rate gates, replaying frozen real-call turns versus live simulations, CI integration, and keeping the suite honest as the agent evolves. - [What a voice AI minute actually costs: component economics from published 2026 prices](https://thunderphone.com/guides/voice-ai-cost-breakdown): STT, LLM, TTS, telephony, and orchestration list prices assembled into a per-minute floor, with the conversion assumptions stated — verified September 2026. ### Languages - [AI Phone Agents in Arabic](https://thunderphone.com/languages/arabic-ai-phone-agents): Build an Arabic-speaking AI phone agent with eight compatible voices, optional premium Arabic voices, an Arabic dashboard, dedicated Arabic documentation, and automatic mid-call language switching. - [AI Phone Agents in Bengali](https://thunderphone.com/languages/bengali-ai-phone-agents): Build a Bengali-speaking AI phone agent with eight compatible voices including Pooja and Rubel, a Bengali dashboard and documentation edition, and automatic mid-call language switching. - [AI Phone Agents in Bulgarian](https://thunderphone.com/languages/bulgarian-ai-phone-agents): Build a Bulgarian-speaking AI phone agent with eight compatible voices, a Bulgarian dashboard and documentation edition, and automatic mid-call language switching. - [AI Phone Agents in Cantonese](https://thunderphone.com/languages/cantonese-ai-phone-agents): Build a Cantonese-speaking AI phone agent with six compatible voices, Cantonese dashboard and documentation localization, and automatic mid-call language switching. - [AI Phone Agents in Chinese](https://thunderphone.com/languages/chinese-ai-phone-agents): Build a Chinese-speaking AI phone agent with eight compatible voices, a Chinese dashboard interface, dedicated Chinese documentation, and automatic mid-call language switching. - [AI Phone Agents in Croatian](https://thunderphone.com/languages/croatian-ai-phone-agents): Build a Croatian-speaking AI phone agent with eight compatible voices, a Croatian dashboard and documentation edition, and automatic mid-call language switching. - [AI Phone Agents in Czech](https://thunderphone.com/languages/czech-ai-phone-agents): Build a Czech-speaking AI phone agent with eight compatible voices, a Czech dashboard, dedicated Czech documentation, and automatic mid-call language switching. - [AI Phone Agents in Danish](https://thunderphone.com/languages/danish-ai-phone-agents): Build a Danish-speaking AI phone agent with eight compatible voices, a Danish dashboard interface, dedicated Danish documentation, and automatic mid-call language switching. - [AI Phone Agents in Dutch](https://thunderphone.com/languages/dutch-ai-phone-agents): Build a Dutch-speaking AI phone agent with eight compatible voices, a Dutch dashboard interface, dedicated Dutch documentation, and automatic mid-call language switching. - [AI Phone Agents in English](https://thunderphone.com/languages/english-ai-phone-agents): Build an English-speaking AI phone agent with 46 compatible voices, 12 optional premium English voices, and automatic mid-call switching to any other supported language. - [AI Phone Agents in Estonian](https://thunderphone.com/languages/estonian-ai-phone-agents): Build an Estonian-speaking AI phone agent with six compatible voices, an Estonian dashboard interface, Estonian documentation, and automatic mid-call language switching. - [AI Phone Agents in Finnish](https://thunderphone.com/languages/finnish-ai-phone-agents): Build a Finnish-speaking AI phone agent with eight compatible voices including Milla and Matti, a Finnish dashboard and documentation edition, and automatic mid-call language switching. - [AI Phone Agents in French](https://thunderphone.com/languages/french-ai-phone-agents): Build a French-speaking AI phone agent with eight compatible voices including premium options Pauline and Marc, a French dashboard and documentation edition, and automatic mid-call language switching. - [AI Phone Agents in German](https://thunderphone.com/languages/german-ai-phone-agents): Build a German-speaking AI phone agent with eight compatible voices including premium options Viktoria and Nico, a German dashboard and documentation edition, and automatic mid-call language switching. - [AI Phone Agents in Greek](https://thunderphone.com/languages/greek-ai-phone-agents): Build a Greek-speaking AI phone agent with eight compatible voices, a Greek dashboard interface, Greek documentation, and automatic mid-call language switching. - [AI Phone Agents in Gujarati](https://thunderphone.com/languages/gujarati-ai-phone-agents): Build a Gujarati-speaking AI phone agent with eight compatible voices, a Gujarati dashboard interface, Gujarati documentation, and automatic mid-call language switching. - [AI Phone Agents in Hebrew](https://thunderphone.com/languages/hebrew-ai-phone-agents): Build a Hebrew-speaking AI phone agent with eight compatible voices, no language surcharge, a Hebrew dashboard interface, dedicated Hebrew documentation, and automatic mid-call language switching. - [AI Phone Agents in Hindi](https://thunderphone.com/languages/hindi-ai-phone-agents): Build a Hindi-speaking AI phone agent with Hindi dashboard and documentation support, eight compatible voices, and automatic mid-call language switching. - [AI Phone Agents in Hungarian](https://thunderphone.com/languages/hungarian-ai-phone-agents): Build a Hungarian-speaking AI phone agent with eight compatible voices, a Hungarian dashboard interface, dedicated Hungarian documentation, and automatic mid-call language switching. - [AI Phone Agents in Indonesian](https://thunderphone.com/languages/indonesian-ai-phone-agents): Build an Indonesian-speaking AI phone agent with eight compatible voices, an Indonesian dashboard and documentation edition, and automatic mid-call language switching. - [AI Phone Agents in Italian](https://thunderphone.com/languages/italian-ai-phone-agents): Build an Italian-speaking AI phone agent with eight compatible voices, an Italian dashboard and documentation edition, and automatic mid-call language switching. - [AI Phone Agents in Japanese](https://thunderphone.com/languages/japanese-ai-phone-agents): Build a Japanese-speaking AI phone agent with eight compatible voices, a Japanese dashboard and documentation edition, and automatic mid-call language switching. - [AI Phone Agents in Kannada](https://thunderphone.com/languages/kannada-ai-phone-agents): Build a Kannada-speaking AI phone agent with eight compatible voices, a Kannada dashboard and documentation edition, and automatic mid-call language switching. - [AI Phone Agents in Korean](https://thunderphone.com/languages/korean-ai-phone-agents): Build a Korean-speaking AI phone agent with eight compatible voices, a Korean dashboard, a dedicated Korean documentation edition, and automatic mid-call language switching. - [AI Phone Agents in Latvian](https://thunderphone.com/languages/latvian-ai-phone-agents): Build a Latvian-speaking AI phone agent with six compatible voices, a Latvian dashboard, a dedicated Latvian documentation edition, and automatic mid-call language switching. - [AI Phone Agents in Lithuanian](https://thunderphone.com/languages/lithuanian-ai-phone-agents): Build a Lithuanian-speaking AI phone agent with six compatible voices, a Lithuanian dashboard, Lithuanian documentation, and automatic mid-call language switching. - [AI Phone Agents in Malayalam](https://thunderphone.com/languages/malayalam-ai-phone-agents): Build a Malayalam-speaking AI phone agent with eight compatible voices, a Malayalam dashboard, Malayalam documentation, and automatic mid-call language switching. - [AI Phone Agents in Marathi](https://thunderphone.com/languages/marathi-ai-phone-agents): Build a Marathi-speaking AI phone agent with eight compatible voices, a Marathi dashboard interface, Marathi documentation, and automatic mid-call language switching. - [AI Phone Agents in Norwegian](https://thunderphone.com/languages/norwegian-ai-phone-agents): Build a Norwegian-speaking AI phone agent with eight compatible voices, a Norwegian dashboard interface, dedicated Norwegian documentation, and automatic mid-call language switching. - [AI Phone Agents in Polish](https://thunderphone.com/languages/polish-ai-phone-agents): Build a Polish-speaking AI phone agent with eight compatible voices at no language surcharge, a Polish dashboard interface, dedicated Polish documentation, and automatic mid-call language switching. - [AI Phone Agents in Portuguese](https://thunderphone.com/languages/portuguese-ai-phone-agents): Build a Portuguese-speaking AI phone agent with eight compatible voices at no language surcharge, a Portuguese dashboard interface, dedicated Portuguese documentation, and automatic mid-call language switching. - [AI Phone Agents in Punjabi](https://thunderphone.com/languages/punjabi-ai-phone-agents): Build a Punjabi-speaking AI phone agent with eight compatible voices, a Punjabi dashboard interface, localized documentation, and automatic mid-call language switching. - [AI Phone Agents in Romanian](https://thunderphone.com/languages/romanian-ai-phone-agents): Build a Romanian-speaking AI phone agent with eight compatible voices, a Romanian dashboard interface, dedicated Romanian documentation, and automatic mid-call language switching. - [AI Phone Agents in Russian](https://thunderphone.com/languages/russian-ai-phone-agents): Build a Russian-speaking AI phone agent with eight compatible voices, no language surcharge, a Russian dashboard interface, dedicated Russian documentation, and automatic mid-call language switching. - [AI Phone Agents in Serbian](https://thunderphone.com/languages/serbian-ai-phone-agents): Build a Serbian-speaking AI phone agent with six compatible voices, a Serbian dashboard interface, localized documentation, and automatic mid-call language switching. - [AI Phone Agents in Slovak](https://thunderphone.com/languages/slovak-ai-phone-agents): Build a Slovak-speaking AI phone agent with eight compatible voices, a Slovak dashboard and documentation edition, and automatic mid-call language switching. - [AI Phone Agents in Slovenian](https://thunderphone.com/languages/slovenian-ai-phone-agents): Build a Slovenian-speaking AI phone agent with six compatible voices, a Slovenian dashboard and documentation edition, and automatic mid-call language switching. - [AI Phone Agents in Spanish](https://thunderphone.com/languages/spanish-ai-phone-agents): Build a Spanish-speaking AI phone agent with Spanish dashboard and documentation support, 12 compatible voices, and automatic mid-call language switching. - [AI Phone Agents in Swahili](https://thunderphone.com/languages/swahili-ai-phone-agents): Build a Swahili-speaking AI phone agent with six compatible voices, a Swahili dashboard and documentation edition, and automatic mid-call language switching. - [AI Phone Agents in Swedish](https://thunderphone.com/languages/swedish-ai-phone-agents): Build a Swedish-speaking AI phone agent with eight compatible voices, a Swedish dashboard and dedicated documentation edition, and automatic mid-call language switching. - [AI Phone Agents in Tamil](https://thunderphone.com/languages/tamil-ai-phone-agents): Build a Tamil-speaking AI phone agent with eight compatible voices, a Tamil dashboard interface, Tamil documentation, and automatic mid-call language switching. - [AI Phone Agents in Telugu](https://thunderphone.com/languages/telugu-ai-phone-agents): Build a Telugu-speaking AI phone agent with eight compatible voices, a Telugu dashboard interface, Telugu documentation, and automatic mid-call language switching. - [AI Phone Agents in Thai](https://thunderphone.com/languages/thai-ai-phone-agents): Build a Thai-speaking AI phone agent with eight compatible voices, a Thai dashboard interface, Thai documentation, and automatic mid-call language switching. - [AI Phone Agents in Turkish](https://thunderphone.com/languages/turkish-ai-phone-agents): Build a Turkish-speaking AI phone agent with eight compatible voices, a Turkish dashboard interface, dedicated Turkish documentation, and automatic mid-call language switching. - [AI Phone Agents in Ukrainian](https://thunderphone.com/languages/ukrainian-ai-phone-agents): Build a Ukrainian-speaking AI phone agent with seven compatible voices, a Ukrainian dashboard interface, dedicated Ukrainian documentation, and automatic mid-call language switching. - [AI Phone Agents in Urdu](https://thunderphone.com/languages/urdu-ai-phone-agents): Build an Urdu-speaking AI phone agent with eight compatible voices, an Urdu dashboard interface, an Urdu documentation edition, and automatic mid-call language switching. - [AI Phone Agents in Vietnamese](https://thunderphone.com/languages/vietnamese-ai-phone-agents): Build a Vietnamese-speaking AI phone agent with eight compatible voices, a Vietnamese dashboard interface, dedicated Vietnamese documentation, and automatic mid-call language switching. ### Use Cases - [24/7 phone answering](https://thunderphone.com/use-cases/24-7-phone-answering): See how a ThunderPhone agent can answer calls around the clock, handle routine requests, capture details, and route calls that need a person with useful context. - [After-hours answering](https://thunderphone.com/use-cases/after-hours-answering): Configure a ThunderPhone agent to answer after-hours calls, handle routine questions, capture complete messages, and escalate defined urgent requests. - [Appointment reminder calls](https://thunderphone.com/use-cases/appointment-reminder-calls): Configure ThunderPhone appointment reminder calls that confirm booking details, record outcomes, support rescheduling, and route exceptions to staff. - [Appointment scheduling by phone](https://thunderphone.com/use-cases/appointment-scheduling): Use a ThunderPhone agent to check approved availability, collect booking details, create appointments, and hand unusual scheduling requests to staff. - [Call deflection for support centers](https://thunderphone.com/use-cases/call-center-deflection): Resolve bounded support requests using approved information, capture structured context, and hand unresolved or sensitive calls to the right human team. - [Call screening and routing](https://thunderphone.com/use-cases/call-screening-routing): Identify why someone is calling, collect the context each destination needs, and route the call through explicit rules with a safe human fallback every time. - [Class and session booking](https://thunderphone.com/use-cases/class-session-booking): Let callers find approved availability, book the right class or session, and route exceptions without asking front-desk staff to re-enter their details. - [Client intake for professional services](https://thunderphone.com/use-cases/client-intake): Use an AI phone agent to collect consistent client intake details, schedule approved next steps, and route matters requiring professional judgment. - [Support intake and triage](https://thunderphone.com/use-cases/customer-support-triage): Collect a caller’s support issue, check approved guidance, classify the next step, and transfer urgent or unresolved cases with useful context for resolution. - [Customer win-back calls](https://thunderphone.com/use-cases/customer-win-back-calls): Reconnect with eligible former customers by phone, record why they left, and offer an approved next step without pressuring people who decline during the call. - [Delivery scheduling](https://thunderphone.com/use-cases/delivery-scheduling): Let callers choose or change delivery windows by phone using approved availability, with confirmed records and clear staff handoff for exceptions or disputes. - [Event registration by phone](https://thunderphone.com/use-cases/event-registration): Let callers register for events by phone, confirm approved details, record attendee information, and route policy or accessibility exceptions to staff. - [FAQ answering line](https://thunderphone.com/use-cases/faq-answering): Use an AI phone agent to answer approved questions, search source material, route exceptions, and show where callers still need a person for follow-up. - [Field service dispatch](https://thunderphone.com/use-cases/field-service-dispatch): Collect service details by phone, apply approved dispatch rules, update the system of record, and escalate urgent or ambiguous jobs to a human dispatcher. - [Virtual front-desk receptionist](https://thunderphone.com/use-cases/front-desk-receptionist): Answer routine front-desk calls, use approved information, schedule eligible appointments, and route exceptions without pretending every request is simple. - [Hours, directions, and info line](https://thunderphone.com/use-cases/hours-directions-info-line): Give callers approved hours, address details, arrival instructions, and basic location information while routing unusual or urgent questions to a person. - [Internal employee hotline](https://thunderphone.com/use-cases/internal-employee-hotline): Give employees a consistent phone path for policy questions, workplace reports, facilities issues, and urgent routing without replacing human judgment. - [Interview scheduling](https://thunderphone.com/use-cases/interview-scheduling): Use an AI phone agent to offer approved interview times, confirm candidate details, and route scheduling exceptions without implying a hiring outcome. - [IT helpdesk intake](https://thunderphone.com/use-cases/it-helpdesk-intake): Give employees a phone path to report technical issues, capture consistent diagnostics, use approved runbooks, and escalate security or access problems. - [IVR replacement](https://thunderphone.com/use-cases/ivr-replacement): Replace rigid phone-menu trees with a conversational call flow that identifies caller intent, answers approved questions, and routes requests with context. - [Job applicant screening](https://thunderphone.com/use-cases/job-applicant-screening): Use an AI phone agent to ask approved job-screening questions, record candidate answers consistently for review, and leave every hiring decision to people. - [Lead qualification calls](https://thunderphone.com/use-cases/lead-qualification-calls): Use a consistent phone conversation to collect lead details, apply explicit qualification rules, update records, and route promising inquiries for follow-up. - [Lead reactivation campaigns](https://thunderphone.com/use-cases/lead-reactivation): Revisit eligible older leads by phone, confirm whether the need still exists, and record a useful next step without treating stale data as current intent. - [Maintenance request line](https://thunderphone.com/use-cases/maintenance-request-line): Give callers a consistent maintenance intake line that captures location and symptoms, creates a request, and escalates urgent or uncertain cases to staff. - [Missed-call recovery](https://thunderphone.com/use-cases/missed-call-recovery): Turn an unanswered inbound call into a tracked callback, verify what the caller needs, record the outcome, and hand urgent requests to staff with context. - [Multilingual call answering](https://thunderphone.com/use-cases/multilingual-call-answering): Answer callers in configured languages, keep intake consistent across language changes, and route sensitive conversations to a fluent human specialist. - [No-show reduction](https://thunderphone.com/use-cases/no-show-reduction): Use ThunderPhone calls to confirm appointment details, resolve scheduling friction, record reschedules, and flag bookings that need human follow-up. - [Outbound notification campaigns](https://thunderphone.com/use-cases/notification-campaigns): Deliver time-sensitive notices by phone, record clear delivery outcomes, and route questions without confusing voicemail or a connected call with understanding. - [Order status line](https://thunderphone.com/use-cases/order-status-line): Let callers request an order update by phone, confirm the status returned by an approved system, and route delivery or account exceptions for staff review. - [Outage and incident information line](https://thunderphone.com/use-cases/outage-information-line): Answer outage calls with approved current status, collect new reports, and route safety, account, or unresolved service issues to the right human team. - [Outbound appointment confirmations](https://thunderphone.com/use-cases/outbound-appointment-confirmation): Confirm upcoming appointments by phone, capture clear attendance outcomes, and route change requests without treating an unanswered call as confirmation. - [Overflow call handling](https://thunderphone.com/use-cases/overflow-call-handling): Use a ThunderPhone agent to answer calls when staff are busy, identify the request, complete routine work, and route exceptions with context during peak demand. - [Phone intake forms](https://thunderphone.com/use-cases/phone-intake-forms): Turn a phone conversation into a consistent set of intake fields, confirm important answers, submit the record, and route exceptions to a person reliably. - [Phone order intake](https://thunderphone.com/use-cases/phone-order-intake): Capture product requests and delivery details by phone, validate them against approved systems, and send payment, authorization, or policy exceptions to staff. - [Phone surveys and feedback calls](https://thunderphone.com/use-cases/phone-surveys): Collect structured feedback by phone, preserve the respondent's own words, and route urgent concerns without turning a survey into a sales conversation. - [Quote request intake](https://thunderphone.com/use-cases/quote-request-intake): Use an AI phone agent to capture quote requirements, qualify each request against defined rules, and route complete details to the estimating team. - [Renewal reminder calls](https://thunderphone.com/use-cases/renewal-reminder-calls): Remind customers about upcoming renewals by phone, capture intent and questions, and route account decisions without collecting payment details on the call. - [Rescheduling and cancellations](https://thunderphone.com/use-cases/rescheduling-cancellations): Let callers change or cancel appointments by phone while protecting calendar rules, recording outcomes clearly, and escalating policy exceptions to staff. - [Reservation management](https://thunderphone.com/use-cases/reservations): Use an AI phone agent to take reservation requests, confirm approved availability, manage permitted changes, and route capacity exceptions to staff. - [Returns and exchanges intake](https://thunderphone.com/use-cases/returns-exchanges-line): Collect return or exchange requests by phone, check approved policy and order data, and route refund, damage, or eligibility exceptions for staff review. - [Property showing scheduling](https://thunderphone.com/use-cases/showing-scheduling): Let prospective buyers or renters request a property showing by phone, check approved availability, book eligible slots, and route special requests for review. - [Speed-to-lead callbacks](https://thunderphone.com/use-cases/speed-to-lead-callbacks): Call new inquiries promptly, collect the first qualification details, record outcomes, and route ready prospects without hiding failed contact attempts. - [Urgent-call routing to humans](https://thunderphone.com/use-cases/urgent-call-routing): Detect business-defined urgency signals, collect the facts a responder needs, and attempt a human transfer with an explicit fallback when unavailable. - [Waitlist management](https://thunderphone.com/use-cases/waitlist-management): Use an AI phone agent to capture waitlist requests, confirm caller preferences, maintain a clear queue record, and route priority decisions to staff. - [Warranty claim intake](https://thunderphone.com/use-cases/warranty-claim-intake): Collect consistent product, purchase, and failure details, use approved troubleshooting, and route warranty decisions and safety exceptions to authorized staff. - [Website voice assistant (embedded widget)](https://thunderphone.com/use-cases/website-voice-assistant): Add an embedded voice assistant to a website for approved answers, lead or support intake, scheduling, and structured follow-up through connected tools. ### Integrations - [Cal.com](https://thunderphone.com/integrations/cal-com): Connect Cal.com so a ThunderPhone agent can check availability, create or cancel bookings, and handle approved scheduling steps during live phone calls. - [Google Calendar](https://thunderphone.com/integrations/google-calendar): Connect Google Calendar so a ThunderPhone agent can check availability and create, update, or cancel calendar events during scheduling calls for callers. - [Google Sheets](https://thunderphone.com/integrations/google-sheets): Connect Google Sheets to ThunderPhone so phone agents can append structured lead details, intake data, and call outcomes to a spreadsheet from live calls. - [HubSpot](https://thunderphone.com/integrations/hubspot): Connect HubSpot so a ThunderPhone agent can find contacts and companies, create or update contacts, and add confirmed call notes during conversations. - [LiveKit Agents](https://thunderphone.com/integrations/livekit-agents): Use a ThunderPhone voice agent as the realtime speech-to-speech model of a LiveKit Agents session with livekit-plugins-thunderphone, with LiveKit rooms, SIP and telephony around it. - [MCP servers](https://thunderphone.com/integrations/mcp-servers): Connect remote MCP servers to ThunderPhone over Streamable HTTP, synchronize their tools, and attach selected capabilities to phone agents during calls. - [OpenAI Realtime API clients](https://thunderphone.com/integrations/openai-realtime-api): Point any OpenAI Realtime API client at ThunderPhone's realtime WebSocket and get a phone agent with speech recognition, reasoning, voice, turn-taking, tools and telephony on the other end of the socket. - [Pipecat](https://thunderphone.com/integrations/pipecat): Run a ThunderPhone voice agent as the speech-to-speech service inside a Pipecat pipeline with the pipecat-thunderphone package: your transport and telephony, ThunderPhone's recognition, reasoning, voice and turn-taking. - [Plivo (bring your own number)](https://thunderphone.com/integrations/plivo): Connect a Plivo number to ThunderPhone through manual SIP, then verify it for inbound and outbound AI calls while keeping your trunk and number ownership. - [REST API and webhooks](https://thunderphone.com/integrations/rest-api-webhooks): Use ThunderPhone's REST API to manage agents and custom functions, then receive signed webhook events for call and workflow activity across your systems. - [Salesforce](https://thunderphone.com/integrations/salesforce): Connect Salesforce to ThunderPhone so phone agents can search CRM records, update leads, and log call activity using approved operations during calls. - [SignalWire (bring your own number)](https://thunderphone.com/integrations/signalwire): Connect a SignalWire number to ThunderPhone through manual SIP for verified inbound and outbound AI calls while retaining your production trunk and number. - [Slack](https://thunderphone.com/integrations/slack): Connect Slack so a ThunderPhone agent can find channels, search messages, and post approved updates while handling live calls and internal team follow-up. - [Telnyx (bring your own number)](https://thunderphone.com/integrations/telnyx): Connect a Telnyx number to ThunderPhone for verified inbound and outbound AI phone calls while keeping your production telephony account, number, and routing. - [TEN Framework](https://thunderphone.com/integrations/ten-framework): Run a ThunderPhone voice agent as the speech-to-speech model of a TEN Framework graph with the thunderphone_mllm_python extension, next to the other realtime model extensions. - [Twilio (bring your own number)](https://thunderphone.com/integrations/twilio): Connect a Twilio account to ThunderPhone, import numbers you already own, verify the route, and use them for inbound and outbound AI calls on business lines. - [Vonage (bring your own number)](https://thunderphone.com/integrations/vonage): Connect a Vonage number to ThunderPhone through manual SIP for verified inbound and outbound AI calls while keeping your telephony setup and ownership. - [Zapier (via MCP)](https://thunderphone.com/integrations/zapier): Connect a Zapier MCP endpoint so a ThunderPhone agent can discover and use the actions it exposes during live phone conversations and phone intake flows. ### Glossary - [10DLC](https://thunderphone.com/glossary/10dlc): 10DLC is the U.S. carrier framework for registered application-to-person text messaging sent through standard local numbers for business use cases. - [A2P messaging](https://thunderphone.com/glossary/a2p-messaging): A2P messaging is text sent from a software application to a person's phone for a defined business purpose, such as a confirmation or service notice. - [A/B testing for voice agents](https://thunderphone.com/glossary/ab-testing-voice-agents): A/B testing for voice agents compares variants on similar live calls to measure which version performs better against a defined outcome. - [Abandonment rate](https://thunderphone.com/glossary/abandonment-rate): Abandonment rate is the share of eligible inbound callers who disconnect before a human or automated agent begins handling their request for service. - [After-hours coverage](https://thunderphone.com/glossary/after-hours-coverage): After-hours coverage handles calls outside normal staffed hours through automation, alternate routing, on-call escalation, or message intake for later action. - [AI answering service](https://thunderphone.com/glossary/ai-answering-service): An AI answering service receives business calls, handles approved requests, records caller details, and escalates calls under defined rules. - [AI phone agent](https://thunderphone.com/glossary/ai-phone-agent): An AI phone agent handles inbound or outbound calls by understanding speech, responding in real time, and carrying out defined phone workflows. - [AI receptionist](https://thunderphone.com/glossary/ai-receptionist): An AI receptionist answers business calls, gathers caller information, handles routine requests, and routes conversations by configured rules. - [All-in pricing](https://thunderphone.com/glossary/all-in-pricing): All-in pricing combines the core components of a service into one per-unit rate. - [Answering machine detection (AMD)](https://thunderphone.com/glossary/answering-machine-detection-amd): Answering machine detection classifies whether an answered outbound call reached a person or an automated greeting, then routes the call accordingly. - [Appointment reminders](https://thunderphone.com/glossary/appointment-reminders): Appointment reminders are scheduled messages or calls that restate booking details and ask the recipient to confirm, cancel, or reschedule. - [Appointment setting](https://thunderphone.com/glossary/appointment-setting): Appointment setting is the process of finding an eligible time, collecting required details, and creating a confirmed booking for a caller. - [Audio codec](https://thunderphone.com/glossary/audio-codec): An audio codec is a method for encoding sound into digital data for transmission or storage and decoding it back into playable audio at the receiving endpoint. - [Automatic call distribution (ACD)](https://thunderphone.com/glossary/automatic-call-distribution-acd): Automatic call distribution is a routing system that assigns inbound calls to suitable agents or resources according to rules and availability. - [Automatic issue detection](https://thunderphone.com/glossary/automatic-issue-detection): Automatic issue detection is the machine-driven flagging of problems across a stream of calls — failure patterns clustered into named issues, often with proposed fixes — so operators find regressions without reviewing every conversation. - [Automatic speech recognition (ASR)](https://thunderphone.com/glossary/automatic-speech-recognition-asr): Automatic speech recognition converts spoken audio into machine-readable words so software can interpret, search, transcribe, or act on speech. - [Average handle time (AHT)](https://thunderphone.com/glossary/average-handle-time-aht): Average handle time measures the average time needed to complete a handled interaction, including the conversation, holds, and defined follow-up work. - [Average speed of answer (ASA)](https://thunderphone.com/glossary/average-speed-of-answer-asa): Average speed of answer measures how long answered inbound callers wait in a queue before a human or automated agent begins handling their request. - [Backchanneling](https://thunderphone.com/glossary/backchanneling): Backchanneling uses brief listener responses such as acknowledgements to show attention without taking over the speaker's conversational turn. - [Barge-in](https://thunderphone.com/glossary/barge-in): Barge-in is the ability for a caller to interrupt a voice agent while it is speaking so the system stops playback and listens to the caller. - [Billing increment](https://thunderphone.com/glossary/billing-increment): A billing increment is the smallest unit of time or usage to which measured activity is rounded for charging. - [Bot disclosure](https://thunderphone.com/glossary/bot-disclosure): Bot disclosure is a clear notice that tells a caller they are interacting with an automated or AI system rather than a human during a phone call. - [Branded calling](https://thunderphone.com/glossary/branded-calling): Branded calling is a caller-identification service that can show a verified business name, logo, or call reason on supported phones and networks. - [Bring your own carrier (BYOC)](https://thunderphone.com/glossary/bring-your-own-carrier-byoc): Bring your own carrier lets a business connect its existing telephony provider or SIP trunk to another platform while retaining carrier control. - [Business Associate Agreement (BAA)](https://thunderphone.com/glossary/business-associate-agreement-baa): A Business Associate Agreement is a HIPAA contract governing how a business associate may handle protected health information on another entity's behalf. - [Call analytics](https://thunderphone.com/glossary/call-analytics): Call analytics turns call metadata, conversation records, and outcomes into measures that help teams understand performance and caller needs. - [Call deflection](https://thunderphone.com/glossary/call-deflection): Call deflection redirects or resolves an inbound request through self-service or another appropriate path before a staffed phone conversation is needed. - [Call disposition](https://thunderphone.com/glossary/call-disposition): A call disposition is a structured outcome label assigned after a call to support consistent reporting and determine the appropriate next workflow action. - [Call flow](https://thunderphone.com/glossary/call-flow): A call flow is the ordered sequence of prompts, decisions, actions, and fallback paths that takes a phone call from initial connection through completion. - [Call forwarding](https://thunderphone.com/glossary/call-forwarding): Call forwarding redirects an incoming call from its original number or endpoint to another destination under an always-on or conditional routing rule. - [Call monitoring](https://thunderphone.com/glossary/call-monitoring): Call monitoring is the live or near-live observation of an active phone conversation for operational oversight, timely support, or intervention when needed. - [Call quality assurance (QA)](https://thunderphone.com/glossary/call-quality-assurance): Call quality assurance is the systematic review of conversations against defined standards to find risks, coach performance, and improve call flows. - [Call queue](https://thunderphone.com/glossary/call-queue): A call queue holds and orders inbound calls until an appropriate agent or other answering resource becomes available to handle each caller. - [Call recording consent](https://thunderphone.com/glossary/call-recording-consent): Call recording consent is the notice, permission, or other lawful basis required before a telephone conversation may be recorded during a call. - [Call recording](https://thunderphone.com/glossary/call-recording): Call recording captures and stores the audio of a phone conversation for later playback, quality review, documentation, training, or dispute resolution. - [Call routing](https://thunderphone.com/glossary/call-routing): Call routing is the process of selecting where a call goes next based on rules, caller information, business context, and destination availability. - [Call scoring](https://thunderphone.com/glossary/call-scoring): Call scoring evaluates a conversation against a defined rubric so teams can compare outcomes, behavior, accuracy, and process adherence consistently across calls. - [Call screening](https://thunderphone.com/glossary/call-screening): Call screening evaluates an incoming call before connecting it, using caller information and purpose to choose whether, where, or how it should proceed. - [What is call simulation? How voice-agent test calls work](https://thunderphone.com/glossary/call-simulation): Call simulation is a controlled test that uses realistic calls to evaluate how a voice agent handles defined scenarios before broader use. - [Call summary](https://thunderphone.com/glossary/call-summary): A call summary is a concise post-call account of the conversation's purpose, key facts, decisions, outcome, and remaining follow-up for review or handoff. - [Call transcription](https://thunderphone.com/glossary/call-transcription): Call transcription converts spoken audio in a phone conversation into a time-ordered text record for search, review, analysis, and downstream processing. - [Call whisper](https://thunderphone.com/glossary/call-whisper): Call whisper is a private audio message delivered to one call participant before or during a conversation without being heard by the other participant. - [Caller ID](https://thunderphone.com/glossary/caller-id): Caller ID is the calling-party information presented to the recipient or receiving network, usually a phone number and sometimes a display name. - [Client portal (call reporting)](https://thunderphone.com/glossary/client-portal): A client portal is a branded, restricted view where a business's own clients can see the phone calls handled on their behalf — call history, transcripts, recordings, and outcomes — without access to the operator's full platform. - [What is CNAM? Caller name delivery, explained](https://thunderphone.com/glossary/cnam): CNAM is caller-name data associated with a North American phone number and shown by participating networks alongside the number on inbound calls. - [Code-switching](https://thunderphone.com/glossary/code-switching): Code-switching is the shift between languages or language varieties within one conversation, sometimes within a single sentence or speaking turn. - [Cold transfer](https://thunderphone.com/glossary/cold-transfer): A cold transfer sends an active caller directly to another person or endpoint without first briefing the recipient or confirming that someone will answer. - [Computer telephony integration (CTI)](https://thunderphone.com/glossary/computer-telephony-integration-cti): Computer telephony integration connects a phone system with business software so applications can use call events, controls, and caller context. - [What are concurrent calls? Call concurrency, explained](https://thunderphone.com/glossary/concurrent-calls): Concurrent calls are calls active at the same time, and concurrency is the number of overlapping calls a system must handle without delaying or rejecting new callers. - [What is consent capture? Definition and how it works on calls](https://thunderphone.com/glossary/consent-capture): Consent capture records a person's affirmative permission for defined communications together with evidence of what they agreed to and when. - [Contact center](https://thunderphone.com/glossary/contact-center): A contact center is the people, processes, and technology a business uses to manage customer conversations across phone and digital channels. - [Containment rate](https://thunderphone.com/glossary/containment-rate): Containment rate is the share of eligible automated interactions completed without a transfer to a human agent or other live human intervention during the call. - [Context window](https://thunderphone.com/glossary/context-window): A context window is the limited amount of text a language model can consider at once, including instructions, dialogue, retrieved content, and tool results. - [Conversational AI](https://thunderphone.com/glossary/conversational-ai): Conversational AI enables software to understand, manage, and respond to human language across multi-turn interactions in voice or text channels. - [CRM integration](https://thunderphone.com/glossary/crm-integration): A CRM integration connects phone workflows with customer records so authorized systems can retrieve context and write back call outcomes and next steps. - [What is CSAT? Customer satisfaction score, defined](https://thunderphone.com/glossary/csat): CSAT is a post-interaction measure of how satisfied customers say they are with a specific call, outcome, product, or service experience they received. - [Customer Effort Score (CES)](https://thunderphone.com/glossary/customer-effort-score-ces): Customer Effort Score measures how easy or difficult customers say it was to complete a task, resolve an issue, or get an answer during a recent interaction. - [Data Processing Agreement (DPA)](https://thunderphone.com/glossary/data-processing-agreement-dpa): A Data Processing Agreement sets the rules for a processor handling personal data on a controller's behalf and allocates key privacy duties. - [Data residency](https://thunderphone.com/glossary/data-residency): Data residency describes the geographic location where an organization’s information is stored or processed by a service and its providers. - [Data retention](https://thunderphone.com/glossary/data-retention): Data retention is the policy and practice of keeping information for a defined period before deleting, anonymizing, or archiving it. - [Dialogue management](https://thunderphone.com/glossary/dialogue-management): Dialogue management determines what a conversational system should do next based on the caller's goal, known information, and call state. - [DID number (Direct Inward Dialing)](https://thunderphone.com/glossary/did-number): A DID number is a public telephone number routed directly to a specific user, team, extension, application, or location in a business phone system. - [Do Not Call (DNC)](https://thunderphone.com/glossary/do-not-call-dnc): Do Not Call describes registries and business-specific requests used to prevent covered telemarketing calls to people who do not want them. - [DTMF (touch-tone signaling)](https://thunderphone.com/glossary/dtmf): DTMF is the touch-tone signaling method that sends paired audio tones from a phone keypad to communicate digits and symbols within a live call. - [E.164 phone number format](https://thunderphone.com/glossary/e164): E.164 is the international phone-number format that represents a dialable number with a country code and national number digits for consistent routing. - [Embeddable voice widget](https://thunderphone.com/glossary/embeddable-voice-widget): An embeddable voice widget lets website visitors start a spoken conversation with a voice agent from a web page without dialing a phone number. - [Endpointing](https://thunderphone.com/glossary/endpointing): Endpointing is the decision process a voice system uses to determine that a caller has finished a spoken turn and that it is time to respond. - [Entity extraction](https://thunderphone.com/glossary/entity-extraction): Entity extraction finds and structures specific details in a caller's language, such as names, dates, locations, quantities, and identifiers. - [Escalation](https://thunderphone.com/glossary/escalation): Escalation moves a call to a person, specialist, or higher-authority process when the current agent cannot handle it safely, appropriately, or completely. - [First call resolution (FCR)](https://thunderphone.com/glossary/first-call-resolution-fcr): First call resolution measures whether a caller's issue is fully resolved during the initial call without requiring another contact or follow-up. - [Function calling (tool use)](https://thunderphone.com/glossary/function-calling): Function calling lets an AI agent request a defined external action with structured inputs, then use the result to continue the conversation. - [GDPR](https://thunderphone.com/glossary/gdpr): The GDPR is the European Union data protection law governing how organizations collect, use, secure, and delete personal data and the rights individuals hold over it. - [Grounding](https://thunderphone.com/glossary/grounding): Grounding ties an AI phone agent's response to supplied evidence, such as approved documents, call context, or results returned by business tools. - [Guardrails](https://thunderphone.com/glossary/guardrails): Guardrails are instructions and controls that limit what an AI phone agent may say or do and define how it handles risky or uncertain situations. - [Hallucination](https://thunderphone.com/glossary/hallucination): A hallucination is an AI-generated statement presented as factual even though the information available to the system during a call does not support it. - [HIPAA](https://thunderphone.com/glossary/hipaa): HIPAA is the U.S. federal framework for how covered entities and business associates use, disclose, and protect identifiable health information. - [HMAC signature](https://thunderphone.com/glossary/hmac-signature): An HMAC signature uses a shared secret and a hash function to let a recipient verify that a message is authentic and unchanged. - [Human handoff](https://thunderphone.com/glossary/human-handoff): A human handoff moves an active conversation from an automated agent to a person when the caller's request needs human attention, judgment, or authority. - [Human in the loop](https://thunderphone.com/glossary/human-in-the-loop): Human in the loop is an operating model in which people review, guide, approve, or take over selected decisions and actions within an automated process. - [Intent detection](https://thunderphone.com/glossary/intent-detection): Intent detection identifies what a caller is trying to accomplish so a voice agent can choose the appropriate response, workflow, or handoff. - [IVR (Interactive Voice Response)](https://thunderphone.com/glossary/ivr): IVR is an automated phone system that collects keypad or spoken input to provide information, perform actions, or route calls without an operator. - [Jitter](https://thunderphone.com/glossary/jitter): Jitter is variation in packet arrival timing that can make a live voice call sound choppy, delayed, or uneven even when the connection stays active. - [Knowledge base](https://thunderphone.com/glossary/knowledge-base): A knowledge base is a curated set of documents and data that an AI phone agent can search to answer questions with relevant business information. - [Large language model (LLM)](https://thunderphone.com/glossary/large-language-model-llm): A large language model is a statistical model trained on extensive text data to interpret instructions, generate language, and perform text-based tasks. - [Latency in voice AI](https://thunderphone.com/glossary/latency-voice-ai): Latency in voice AI is the delay between a caller's speech or action and the system's audible response, including processing and delivery time. - [Lead qualification](https://thunderphone.com/glossary/lead-qualification): Lead qualification is the structured process of deciding whether a prospect fits defined criteria and should advance to a specific next step. - [Letter of Authorization (LOA)](https://thunderphone.com/glossary/letter-of-authorization-loa): A Letter of Authorization permits a carrier or provider to act on a customer's behalf for a defined number-porting or telephone-service request. - [Mean Opinion Score (MOS)](https://thunderphone.com/glossary/mean-opinion-score-mos): Mean Opinion Score is a summary rating of perceived voice quality, based on listener judgments or a model designed to estimate those judgments. - [Missed-call recovery](https://thunderphone.com/glossary/missed-call-recovery): Missed-call recovery is the process of following up after an unanswered inbound call so the caller can resume the intended conversation or request. - [Model Context Protocol (MCP)](https://thunderphone.com/glossary/model-context-protocol-mcp): Model Context Protocol is a standard interface for AI applications to discover and invoke tools or retrieve context exposed by connected servers. - [Multi-turn conversation](https://thunderphone.com/glossary/multi-turn-conversation): A multi-turn conversation is an exchange in which later questions, answers, or actions depend on information established in earlier turns. - [Multilingual voice agent](https://thunderphone.com/glossary/multilingual-voice-agent): A multilingual voice agent can understand and respond in more than one configured language while carrying context through a spoken conversation. - [Natural language processing (NLP)](https://thunderphone.com/glossary/natural-language-processing-nlp): Natural language processing is the field of computational methods used to analyze, transform, understand, and generate human language in software systems. - [Natural language understanding (NLU)](https://thunderphone.com/glossary/natural-language-understanding-nlu): Natural language understanding derives machine-usable meaning from language, such as a speaker's intent, referenced entities, and conversational context. - [Net Promoter Score (NPS)](https://thunderphone.com/glossary/net-promoter-score-nps): Net Promoter Score measures customers' stated willingness to recommend a company by comparing the shares of promoters and detractors in a defined survey. - [Neural text-to-speech](https://thunderphone.com/glossary/neural-text-to-speech): Neural text-to-speech uses learned neural networks to generate spoken audio from text, including its pronunciation, timing, and vocal expression. - [No-show recovery](https://thunderphone.com/glossary/no-show-recovery): No-show recovery is the follow-up process used after a person misses a scheduled appointment to resolve its status and arrange a next step. - [Number porting](https://thunderphone.com/glossary/number-porting): Number porting is the carrier process for moving a telephone number to a new service provider while keeping the public number customers dial unchanged. - [OAuth](https://thunderphone.com/glossary/oauth): OAuth is an authorization framework that lets an application receive limited access to another service without obtaining a user’s password. - [Omnichannel](https://thunderphone.com/glossary/omnichannel): Omnichannel service connects customer identity, context, routing, and history across communication channels so each interaction can continue the journey. - [Opt-out management](https://thunderphone.com/glossary/opt-out-management): Opt-out management is the process of receiving, recording, and enforcing a person's request to stop defined calls or other communications. - [Outbound campaign](https://thunderphone.com/glossary/outbound-campaign): An outbound campaign is a coordinated program that places calls to an eligible contact list using defined timing, conversation, and outcome rules. - [Overage rate](https://thunderphone.com/glossary/overage-rate): An overage rate is the per-unit price charged when usage exceeds a plan’s included allowance. - [Overflow answering](https://thunderphone.com/glossary/overflow-answering): Overflow answering routes calls to backup capacity when the primary team cannot answer within the business's chosen conditions or time threshold. - [Packet loss](https://thunderphone.com/glossary/packet-loss): Packet loss occurs when some audio data sent across a network never reaches its destination, which can create gaps, distortion, or missing speech. - [Pass-through pricing](https://thunderphone.com/glossary/pass-through-pricing): Pass-through pricing separates a platform’s fee from component costs billed at cost or directly by external providers. - [PBX](https://thunderphone.com/glossary/pbx): A PBX is a private business phone system that connects internal extensions and controls how calls move between users, outside lines, and locations. - [Personally identifiable information (PII)](https://thunderphone.com/glossary/personally-identifiable-information-pii): Personally identifiable information is data that identifies a specific person directly or can be linked with other data to do so in a given context. - [Phoneme](https://thunderphone.com/glossary/phoneme): A phoneme is the smallest sound category that can distinguish one word from another in a language, regardless of how the sound is spelled. - [Platform fee](https://thunderphone.com/glossary/platform-fee): A platform fee is a fixed recurring charge for access to a service tier, separate from usage charges. - [Power dialer](https://thunderphone.com/glossary/power-dialer): A power dialer calls contacts sequentially when capacity is available, reducing manual dialing while keeping outreach tied to an ordered contact list. - [Predictive dialer](https://thunderphone.com/glossary/predictive-dialer): A predictive dialer places outbound calls ahead of agent availability and uses pacing estimates to connect live answers to available agents. - [Prompt engineering](https://thunderphone.com/glossary/prompt-engineering): Prompt engineering is the disciplined process of writing, testing, and refining instructions so an AI agent behaves reliably across real scenarios. - [Pronunciation dictionary](https://thunderphone.com/glossary/pronunciation-dictionary): A pronunciation dictionary maps written terms to approved spoken forms so speech systems handle names, acronyms, and specialized vocabulary consistently. - [Prosody](https://thunderphone.com/glossary/prosody): Prosody is the pattern of rhythm, stress, pitch, loudness, and timing that carries structure and meaning beyond the words in spoken language. - [Protected health information (PHI)](https://thunderphone.com/glossary/protected-health-information-phi): Protected health information is identifiable health data that a covered entity or business associate holds or transmits in a HIPAA-covered context. - [PSTN](https://thunderphone.com/glossary/pstn): The PSTN is the public telephone network that assigns dialable numbers and routes calls among fixed, mobile, and business phone systems across carriers. - [Quiet hours](https://thunderphone.com/glossary/quiet-hours): Quiet hours are protected time windows when an outbound calling system does not contact recipients based on local time, law, or business policy. - [Redaction](https://thunderphone.com/glossary/redaction): Redaction is the removal or masking of sensitive information so it is no longer visible or available in a record that is viewed, shared, or retained. - [Regression testing for voice agents](https://thunderphone.com/glossary/regression-testing-voice-agents): Regression testing for voice agents reruns consistent call scenarios to detect behavior changes after prompts, tools, or workflows are updated. - [REST API](https://thunderphone.com/glossary/rest-api): A REST API is an HTTP interface that organizes operations around resources and uses standard methods to create, read, update, or delete them. - [Retrieval-augmented generation (RAG)](https://thunderphone.com/glossary/retrieval-augmented-generation-rag): Retrieval-augmented generation finds relevant source material at response time and gives it to a language model to produce a grounded answer. - [Retry policy](https://thunderphone.com/glossary/retry-policy): A retry policy defines whether, when, and how often another call attempt may occur after a specific unsuccessful or incomplete outcome. - [RTP (Real-time Transport Protocol)](https://thunderphone.com/glossary/rtp): RTP is a network protocol that carries timestamped, sequenced audio or video packets so receivers can play real-time media in order during an internet call. - [Screen pop](https://thunderphone.com/glossary/screen-pop): A screen pop automatically displays relevant caller and interaction context in an agent's workspace when a call arrives, is answered, or is transferred. - [Sentiment analysis](https://thunderphone.com/glossary/sentiment-analysis): Sentiment analysis estimates a caller's emotional tone from spoken or transcribed language to help teams interpret and review interactions. - [Service level agreement (SLA)](https://thunderphone.com/glossary/service-level-agreement-sla): A service level agreement defines a provider's measurable service commitments, how performance is calculated, and what happens when a commitment is missed. - [SIP REFER](https://thunderphone.com/glossary/sip-refer): SIP REFER is a signaling method that asks an endpoint to initiate a new SIP request to a specified target, commonly to transfer a call between parties. - [SIP trunk](https://thunderphone.com/glossary/sip-trunk): A SIP trunk is an IP-based connection that links a phone system or voice application to a telephony provider for call routing and number delivery. - [SIP URI](https://thunderphone.com/glossary/sip-uri): A SIP URI is an address that identifies a user, service, or endpoint for routing and delivering a SIP session across an IP communications network. - [SIP (Session Initiation Protocol)](https://thunderphone.com/glossary/sip): SIP is a signaling protocol used to start, modify, route, and end real-time voice or video communication sessions, including phone calls, over IP. - [Slot filling](https://thunderphone.com/glossary/slot-filling): Slot filling is the process of collecting and validating the specific pieces of information required to complete a conversational task. - ["Spam Likely" labeling](https://thunderphone.com/glossary/spam-likely-labeling): "Spam Likely" labeling is a carrier or device warning that a call may be unwanted, based on reputation signals rather than a universal verdict. - [Speaker diarization](https://thunderphone.com/glossary/speaker-diarization): Speaker diarization separates a call recording into speaker-labeled segments, showing who spoke when and supporting clearer transcripts and review. - [Speech-to-text (STT)](https://thunderphone.com/glossary/speech-to-text-stt): Speech-to-text converts spoken audio into written words for transcripts, search, analysis, accessibility, conversational software, and call workflows. - [Speed to lead](https://thunderphone.com/glossary/speed-to-lead): Speed to lead measures the time between a prospect's qualifying action and the business's first defined response to that prospective customer. - [SRTP](https://thunderphone.com/glossary/srtp): SRTP is a security profile for real-time media that encrypts RTP payloads and helps detect tampering and replayed packets during live voice or video sessions. - [SSML (Speech Synthesis Markup Language)](https://thunderphone.com/glossary/ssml): SSML is a markup language that gives a compatible speech synthesizer instructions for pronunciation, pauses, emphasis, pacing, and pitch. - [STIR/SHAKEN](https://thunderphone.com/glossary/stir-shaken): STIR/SHAKEN is a caller-ID authentication framework that lets phone networks assess an originating provider's authority to use a calling number. - [Suppression list](https://thunderphone.com/glossary/suppression-list): A suppression list is a controlled set of phone numbers or contacts that a dialing workflow must exclude before an outbound call or retry is placed. - [System prompt](https://thunderphone.com/glossary/system-prompt): A system prompt is the instruction set that defines an AI agent's role, priorities, boundaries, and rules before a caller's conversation begins. - [Task completion rate](https://thunderphone.com/glossary/task-completion-rate): Task completion rate is the share of eligible calls or tasks in which an agent achieves the intended outcome end-to-end. - [TCPA (Telephone Consumer Protection Act)](https://thunderphone.com/glossary/tcpa): The TCPA is a U.S. federal law that restricts certain calls, texts, and faxes and establishes protections for consent and calling preferences. - [Text-to-speech (TTS)](https://thunderphone.com/glossary/text-to-speech-tts): Text-to-speech converts written text into spoken audio, giving a voice application a consistent way to deliver generated responses aloud on a live call. - [Time to first audio](https://thunderphone.com/glossary/time-to-first-audio): Time to first audio measures how long a voice system takes to begin playing an audible response after a defined input event in a live interaction. - [Toll-free number](https://thunderphone.com/glossary/toll-free-number): A toll-free number lets callers reach an organization without a separate long-distance charge, while the recipient pays for the inbound phone service. - [Turn-taking](https://thunderphone.com/glossary/turn-taking): Turn-taking is the coordination of who speaks, who listens, and when conversational control passes between a caller and a voice agent during a call. - [Two-party consent](https://thunderphone.com/glossary/two-party-consent): Two-party consent is a recording rule that requires every participant's permission before certain conversations on a call may lawfully be recorded. - [Uptime](https://thunderphone.com/glossary/uptime): Uptime is the share of time a service is available according to a defined standard, often expressed as a percentage or number of nines. - [Virtual receptionist](https://thunderphone.com/glossary/virtual-receptionist): A virtual receptionist performs front-desk call handling from outside the physical office through human operators, software, or a hybrid service. - [Voice activity detection (VAD)](https://thunderphone.com/glossary/voice-activity-detection-vad): Voice activity detection identifies which parts of an audio stream contain human speech so a voice agent can listen and respond at the right time. - [Voice agent observability](https://thunderphone.com/glossary/voice-agent-observability): Voice agent observability is the practice of instrumenting AI phone agents so operators can see call volume, outcomes, failures, and latency — and attribute each to a specific agent and configuration. - [Voice agent](https://thunderphone.com/glossary/voice-agent): A voice agent is software that conducts spoken conversations in real time, follows task-specific instructions, and can take actions for the caller. - [Voice AI](https://thunderphone.com/glossary/voice-ai): Voice AI combines speech recognition, language processing, and speech generation so software can understand spoken input and respond aloud in real time. - [Voice cloning](https://thunderphone.com/glossary/voice-cloning): Voice cloning creates a synthetic voice that resembles a particular speaker and can produce new speech the person did not originally record. - [What is a voice user interface (VUI)? Definition and examples](https://thunderphone.com/glossary/voice-user-interface-vui): A voice user interface lets a person operate a system through spoken input and audio responses instead of relying only on screens or controls. - [Voicemail detection](https://thunderphone.com/glossary/voicemail-detection): Voicemail detection identifies when an outbound call has reached a mailbox so the system can leave a message, hang up, or schedule another attempt. - [Voicemail drop](https://thunderphone.com/glossary/voicemail-drop): Voicemail drop leaves a prepared message after an outbound call reaches voicemail, then records the result without starting a live conversation. - [VoIP](https://thunderphone.com/glossary/voip): VoIP carries voice calls as digital data over internet protocol networks instead of relying entirely on dedicated circuits for call routing. - [Warm transfer](https://thunderphone.com/glossary/warm-transfer): A warm transfer privately briefs the intended recipient, giving that person context and a chance to accept before connecting the caller to a live conversation. - [Webhook](https://thunderphone.com/glossary/webhook): A webhook is an automated HTTP message sent when an event occurs, allowing another system to react without repeatedly checking for updates. - [WebRTC](https://thunderphone.com/glossary/webrtc): WebRTC is a set of browser and application technologies for sending real-time audio, video, and data over an internet connection with low delay. - [WebSocket](https://thunderphone.com/glossary/websocket): WebSocket is a protocol that maintains a persistent, two-way connection so a client and server can send messages without new HTTP requests. - [Word error rate (WER)](https://thunderphone.com/glossary/word-error-rate-wer): Word error rate measures speech-recognition transcription errors by comparing a generated transcript with a human-verified reference transcript. - [Zero data retention](https://thunderphone.com/glossary/zero-data-retention): Zero data retention is an arrangement in which a service does not keep covered customer content after it finishes the required processing. ## Documentation Product and API documentation lives at https://thunderphone.com/docs in English plus 47 translated languages at /{locale}/docs (all pages enumerated in the sitemap; full raw content at https://thunderphone.com/docs/llms-full.txt): - Documentation in Arabic: https://thunderphone.com/ar/docs - Documentation in Bulgarian: https://thunderphone.com/bg/docs - Documentation in Bengali: https://thunderphone.com/bn/docs - Documentation in Czech: https://thunderphone.com/cs/docs - Documentation in Danish: https://thunderphone.com/da/docs - Documentation in German: https://thunderphone.com/de/docs - Documentation in Greek: https://thunderphone.com/el/docs - Documentation in Spanish: https://thunderphone.com/es/docs - Documentation in Estonian: https://thunderphone.com/et/docs - Documentation in Finnish: https://thunderphone.com/fi/docs - Documentation in French: https://thunderphone.com/fr/docs - Documentation in Gujarati: https://thunderphone.com/gu/docs - Documentation in Hebrew: https://thunderphone.com/he/docs - Documentation in Hindi: https://thunderphone.com/hi/docs - Documentation in Croatian: https://thunderphone.com/hr/docs - Documentation in Hungarian: https://thunderphone.com/hu/docs - Documentation in Indonesian: https://thunderphone.com/id/docs - Documentation in Italian: https://thunderphone.com/it/docs - Documentation in Japanese: https://thunderphone.com/ja/docs - Documentation in Kannada: https://thunderphone.com/kn/docs - Documentation in Korean: https://thunderphone.com/ko/docs - Documentation in Lithuanian: https://thunderphone.com/lt/docs - Documentation in Latvian: https://thunderphone.com/lv/docs - Documentation in Malayalam: https://thunderphone.com/ml/docs - Documentation in Marathi: https://thunderphone.com/mr/docs - Documentation in Norwegian Bokmål: https://thunderphone.com/nb/docs - Documentation in Dutch: https://thunderphone.com/nl/docs - Documentation in Punjabi: https://thunderphone.com/pa/docs - Documentation in Polish: https://thunderphone.com/pl/docs - Documentation in Portuguese: https://thunderphone.com/pt/docs - Documentation in Romanian: https://thunderphone.com/ro/docs - Documentation in Russian: https://thunderphone.com/ru/docs - Documentation in Slovak: https://thunderphone.com/sk/docs - Documentation in Slovenian: https://thunderphone.com/sl/docs - Documentation in Serbian: https://thunderphone.com/sr/docs - Documentation in Swedish: https://thunderphone.com/sv/docs - Documentation in Swahili: https://thunderphone.com/sw/docs - Documentation in Tamil: https://thunderphone.com/ta/docs - Documentation in Telugu: https://thunderphone.com/te/docs - Documentation in Thai: https://thunderphone.com/th/docs - Documentation in Turkish: https://thunderphone.com/tr/docs - Documentation in Ukrainian: https://thunderphone.com/uk/docs - Documentation in Urdu: https://thunderphone.com/ur/docs - Documentation in Vietnamese: https://thunderphone.com/vi/docs - Documentation in Cantonese: https://thunderphone.com/yue/docs - Documentation in Chinese (Simplified): https://thunderphone.com/zh/docs - Documentation in Chinese (Traditional): https://thunderphone.com/zh-Hant/docs ## Blog The blog at https://thunderphone.com/blog is a published discovery surface, included in the sitemap. ### Introducing TranslateMyCall URL: https://thunderphone.com/blog/introducing-translatemycall Published: 2026-09-02 Summary: One free phone number that live-interprets your calls across 70+ languages. Dial (228) 888-8666, merge in anyone — or put it on speakerphone — and both sides hear their own language. No app, no account. ### Announcing ThunderPhone v2 URL: https://thunderphone.com/blog/thunderphone-self-serve Published: 2026-08-27 Summary: ThunderPhone v2 is live for everyone: self-serve voice AI from 2c/min with models included, a 99.4% Big Bench Audio score, and a full platform for building, testing, and monitoring AI phone agents. ### Announcing ThunderPhone URL: https://thunderphone.com/blog/announcing-thunderphone Published: 2026-03-10 Summary: Today, we’re proud to announce the public launch of ThunderPhone, which makes it easy to automate phone calls with AI. With a completely different integrated architecture from other phone AI platforms, ThunderPhone is able to achieve much higher performance, lower cost, and fewer integrations headaches. ## Changelog Dated release notes for the ThunderPhone platform live at https://thunderphone.com/changelog, going back to October 2025. Included in the sitemap. ## Pages Intentionally Excluded From Discovery Demo and prototype routes are excluded from robots and sitemap discovery. ## Canonical External Links - Documentation: https://thunderphone.com/docs - Trust center: https://thunderphone.com/security - App login: https://app.thunderphone.com/login - App signup: https://app.thunderphone.com/signup ## Contact Primary public contact from the site: alex@thunderphone.com.