Changelog

Dates reflect when changes reached production.

v1.9.2 — August 17, 2026

• Realtime API: added session.live_transcripts — caller transcript segments stream over the session socket as they finalize, instead of arriving only in the post-call record.
• Moved the premium voice lineup to the latest synthesis model generation; Urdu voices re-cast.
• Multilingual agents now switch voice language in the same turn the caller switches, not one turn late.
• Exposed the silent-line hangup timeout as an agent builder setting.
• Outbound greeting now yields when a live reply wins the pickup race — no more double-talk when a human answers mid-greeting.
• Fixed a consent-gate redirect loop for invited members: the governing org now carries through the acceptance flow.

v1.9.1 — August 12, 2026

• Added send_email agent tool — mid-call email delivery to a configured recipient.
• Higher answer quality on turns that follow substantive tool results.
• Spelling readback got faster and more accurate on names, addresses, and confirmation codes.

v1.9.0 — August 6, 2026

• POST /v1/call fast-returns with a durable dial record and idempotent retries; dial progression continues async.
• Made max_duration authoritative: the agent wraps the call before the cap fires rather than the media layer hard-dropping.
• Exactly-once tool-call/response pairing — an orphaned tool call can no longer wedge delivery of later messages.
• Added additional_audio_context (tri-state) controlling how much prior-turn audio the model hears; surfaced in builder advanced settings.
• Outbound pre-conversation audio is now anchored on SIP answer supervision instead of wall-clock timing.
• Hardened how integration credentials are stored.

v1.8.2 — August 5, 2026

• Shipped docs in all 47 supported languages — 1,100+ localized pages with hreflang pairs and localized sitemaps.
• Recording disclosure defaults on, per-agent override with an effective-state readout; the runtime fails safe to "disclose" on any config ambiguity.
• Cut streaming first-audio latency at call start.

v1.8.1 — August 3, 2026

• Per-agent recording opt-out; the consent announcement is muxed into retained recordings so the artifact is self-documenting.
• Added a one-time per-org TCPA confirmation gating outbound calling features.
• Fixed Cantonese being voiced with a Mandarin accent.
• Tuned CJK responses down to conversational length — long-form answers read badly at TTS pace.
• Synthesis stalls no longer leave dead air — the turn recovers automatically.

v1.8.0 — July 31, 2026

• Custom voice cloning.
• Regional consent regimes: announcement opt-in for EEA/UK/CH, default-on with opt-out elsewhere, resolved per call leg.
• Retention: deletion cascade, erasure tombstones, and a scheduled dsar_sweep job for data-subject requests.
• ToS v2.0 with versioned, evidenced acceptance records.
• Support presence: heartbeat-based session presence with proactive support chat.

v1.7.4 — July 29, 2026

• Knowledge bases: URL import behind an SSRF-guarded server-side fetcher.
• Added the forgot-password flow.
• Dashboard restyled to the new design system.
• Widget 1.2.1: mic no longer stays hot during ringback.

v1.7.3 — July 28, 2026

• Redesigned website.

v1.7.2 — July 27, 2026

• Premium voice tier with an accent-grouped catalog.
• Premium synthesis failures now fail over to the standard voice mid-turn instead of dropping the turn.
• Fixed PCM frame misalignment in streamed synthesis output.

v1.7.1 — July 24, 2026

• Tool-wait reassurance: the agent narrates progress on long tool calls instead of going silent; placeholder cadence tuned to kill filler loops.
• Drag-and-drop uploads for knowledge bases.
• macOS app auto-updates.
• Fixed a double-greeting race at call start.

v1.7.0 — July 22, 2026

• Dashboard and site localized into 47 locales: namespace-split catalogs, ICU plural rules (including Arabic's six categories), locale cookie, per-account preference.
• Transactional emails and system prompts localized to match.

v1.6.5 — July 22, 2026

• Stored provider credentials re-encrypted under rotating keys, rotated online with no downtime.
• Session tokens now revoke on password change/reset; added an admin break-glass path.
• Per-device sessions with individual revocation.
• Billing pipeline hardening: spend caps enforced under concurrency, idempotent auto-reload, correct handling of out-of-order refund reversals.

v1.6.4 — July 20, 2026

• Security hardening sweep across authorization scoping, export validation, and outbound fetch guards.
• DTMF digits are redacted from logs and stored artifacts.
• Webhook egress is IP-pinned and SSRF-guarded.
• Call exports now walk the full filtered set instead of the first page.

v1.6.3 — July 17, 2026

• Org spending limits enforced at call admission with reservation semantics — calls are declined before budget is exceeded, not billed past it.
• Realtime WebSocket API: bidirectional audio and event frames for building custom call frontends.
• Webhook platform: HMAC signatures over canonical payload bytes, exponential-backoff retry ladder, coverage across all call events.
• Idempotent top-ups and stricter payment-webhook verification.
• Added a live prompt-size meter to the agent builder.

v1.6.2 — July 16, 2026

• Client portals: scoped read-only access for your clients via emailed login codes.
• In-app assistant: voice mode, guided walkthroughs that drive the UI step by step, human handoff.
• Knowledge bases: document upload with chunked ingestion and grounded retrieval.
• Per-agent connect tones and progress sounds.

v1.6.1 — July 13, 2026

• In-dashboard number lifecycle: search → order → provision → assign.
• New agent options: silence check-in kill switch; connect tone at call start.
• Provisioning failures now return structured JSON errors instead of raw 500s.
• Raw-audio lane recovers mid-call when its stream reader dies.

v1.6.0 — July 9, 2026

• Warm (attended) transfers: hold leg, conversational consent on both sides, merge-on-consent.
• iPhone home-screen install (PWA).
• Acknowledgements now dispatch immediately when the caller stops speaking.

v1.5.3 — June 27, 2026

• Suppressed TTS narration of keypad tones.
• Storm tool-calling gains a model fallback path for upstream slowdowns.

v1.5.2 — June 18, 2026

• Fewer mid-thought cutoffs on Storm: end-of-turn detection improved beyond simple pause thresholds. Benchmarked before rollout.
• Configurable response cues on Storm.

v1.5.1 — June 15, 2026

• Fixes to hold handling and IVR menu navigation on outbound calls.
• Website refresh.

v1.5.0 — June 9, 2026

• Improved spelling readback accuracy on ambiguous spans.
• Language detection stays active for the full call; added a short-utterance switch detector and lowered the configured-language confidence floor.
• Fixed autosave for additional agent languages.

v1.4.3 — May 28, 2026

• TTS holds while incoming audio is still unconfirmed as speech — no more talking over a hesitating caller.
• Assorted call-quality fixes.

v1.4.2 — May 21, 2026

• Rebuilt VAD around multiple acoustic signals — improves the precision/recall tradeoff of speech detection in noisy environments.
• VAD spans now emit complete — no more truncated leading edges on utterances.
• Fixed greeting-echo self-barge-in: the agent no longer interrupts itself on its own opening line.

v1.4.1 — May 13, 2026

• Voice system overhaul: rebuilt catalog with consistent naming.

v1.4.0 — May 5, 2026

• Live transcript streaming to the dashboard during in-progress calls.
• Automatic language detection with mid-call switching.
• A/B experiment framework: run agent variants side by side with outcome comparison.

v1.3.1 — April 28, 2026

• Automatic issue investigation: flagged calls get a structured, reviewable investigation record.
• Draft deploys: stage agent edits against an init snapshot, publish atomically.
• Settings redesign; guided onboarding coach.
• Call-success scoring redefined around task completion instead of call completion.
• Configurable end-of-call silence tail.

v1.3.0 — April 23, 2026

• Scenario generation: simulated callers with generated personas and goals, runnable against an agent pre-launch.
• Test-call and issues-page overhaul.

v1.2.1 — April 21, 2026

• Call history export.
• API documentation rewrite.
• On-request mid-call language switching.
• Acknowledgements localized to the caller's language.
• Composable, saveable filters across calls and numbers.

v1.2.0 — April 17, 2026

• Agent builder redesign.
• Multilingual agents switch languages mid-conversation without a re-prompt.
• Voice catalog renamed for consistency.
• Storm output restructured for complex requests.

v1.1.1 — April 14, 2026

• Grading signal-quality pass: missing transcripts no longer grade as failures; grader inputs deduplicated.
• Pipeline reports across call batches.

v1.1.0 — April 8, 2026

• Phone number labels.
• Transfers and goodbyes are interruptible without corrupting call state.
• Per-agent endpointing configuration for IVR navigation.

v1.0.4 — March 30, 2026

• Call history detail view upgraded.
• Configurable completion prompt on outbound calls.
• Storm degrades gracefully under slow upstream APIs instead of stalling the turn.

v1.0.3 — March 23, 2026

• DTMF send: agents press keys to drive IVRs and enter codes, with per-digit acknowledgement.
• Hold state with an explicit wait-on-hold trigger — the agent waits out hold music and resumes on a human voice.
• Configurable speak/act ordering.
• Fixed silent follow-ups after DTMF entry.

v1.0.2 — March 18, 2026

• New HD voices.
• Widget call-cost display fixed.
• Stale in_progress calls now detected and cleaned up.

v1.0.1 — March 16, 2026

• Call connect latency reduced.
• Widget: ringback no longer bleeds into the session audio.
• Phone-number management API.

v1.0.0 — March 10, 2026

• Full call recordings, archived and playable from the dashboard.
• Browser test calls.
• Teammate invites through signup.
• Per-call cost breakdowns.

v0.9.2 — March 8, 2026

• Bolt streams TTS as tokens are generated instead of waiting on the full completion — cuts time-to-first-word.
• Bolt transcription got faster and more robust to transcriber slowdowns.
• Passkey sign-in with org-level enforcement.
• Call history shows real billed cost per call.

v0.9.1 — March 5, 2026

• Widget fast-connect plus built-in noise cancellation for browser calls.
• Reduced Spark turn latency and improved recovery from failed turns.
• Fixed sentence restarts after long silence tails.

v0.9.0 — March 2, 2026

• Multi-language conversations.
• Production-readiness hardening pass.

v0.8.0 — February 26, 2026

• Added redundancy across model backends — single-backend failures no longer surface mid-call.

v0.7.1 — February 25, 2026

• Configurable reasoning depth on Storm.
• Tool-call placeholders: the agent acknowledges before executing longer actions.
• Hangup timing recorded to the precise disconnect moment.
• Webhook delivery dedup.

v0.7.0 — February 20, 2026

• Consent controls for callers and users.
• Token-streamed TTS path — synthesis starts before the sentence is complete.
• Background ambiance decoupled from agent voice gain.

v0.6.2 — February 18, 2026

• Prompt regeneration from agent config.
• Fixed provisioning button states.

v0.6.1 — February 12, 2026

• Developer docs launched.

v0.6.0 — February 11, 2026

• Embeddable widget: a voice agent on your own site via script tag, authenticated with publishable keys.
• Introduced the three-engine lineup — Spark, Bolt, Storm — differing in model size, latency, and per-minute rate.
• Integration-based tool routing: tool calls resolve through the connected integration's endpoint.

v0.5.0 — February 10, 2026

• The ThunderPhone dashboard: build, test, and manage agents from the browser.
• Organizations and teams with email invites.
• BYO-carrier SIP trunking and unified number management.
• Integrations UI.
• Ambient background sound options.
• Google OAuth sign-in.

v0.4.2 — January 27, 2026

• Call-transport hardening after a series of edge-case disconnects.
• Acoustic-event classification moved off the response hot path — noise detection no longer adds latency.

v0.4.1 — January 14, 2026

• Voice lineup expanded.
• Fixed an audio-pump stall that could freeze playback mid-turn.
• Reduced latency on the live-response path.

v0.4.0 — January 6, 2026

• Usage logging and per-call cost reporting.
• Collapsed per-turn model round trips into a single request, removing one network round trip from every reply.
• Fixed dropped transcript spans.

v0.3.3 — December 18, 2025

• Completion no longer blocks on a slow transcriber.
• Transcript finalization timeout fixes.
• Fixed artifacts in merged call audio.

v0.3.1 — December 12, 2025

• Added an acoustic noise classifier to cut false speech triggers from background noise; tuned its confidence threshold against recorded calls.
• End-of-call detection: added farewell-intent and post-farewell-silence signals to improve the precision/recall tradeoff — fewer premature hangups, fewer lingering dead lines.
• Added a lenient VAD mode for quiet callers — lower onset threshold at the cost of some false accepts.
• Faster acknowledgement dispatch.

v0.3.0 — December 4, 2025

• Realtime transcription.
• Recordings consolidated to a single mixed audio file per call.
• Latency fixes across the pipeline.

v0.2.4 — November 24, 2025

• Acknowledgements are checked against the pending completion so they can't contradict the final answer.
• Raised the acknowledgement timeout to stop premature re-prompts.
• Fixed audio glitches in longer replies.
• Fixed handling of long caller silences.

v0.2.3 — November 20, 2025

• Call recording.
• Hold music during waits and transfers.
• First version of Spark: moved simple call flows onto a smaller, lower-latency model.
• Phone number availability expanded.

v0.2.2 — November 14, 2025

• Call-completion webhooks now wait on finalized call state before firing.
• Cut model reasoning effort on simple turns to reduce response latency.

v0.2.1 — November 11, 2025

• Barge-in: the agent halts speech on caller speech onset.
• Bounded runaway audio buffers.
• Response latency reduced.
• New voices.

v0.2.0 — November 5, 2025

• Acknowledgements now condition on the caller's request instead of using generic filler.
• Call-end webhook improvements.
• Faster recovery when a turn stalls past five seconds.

v0.1.4 — October 31, 2025

• Interruption handling.
• The agent finishes its sign-off before hanging up — no more mid-sentence cutoffs.
• Phone numbers formatted properly for speech.

v0.1.3 — October 29, 2025

• Webhooks for call events.
• Mid-call recovery on connection blips.

v0.1.2 — October 28, 2025

• Spelling readback for names and confirmation numbers.
• Reduced false speech triggers from background noise.
• More voices and accents.

v0.1.0 — October 8, 2025

• First release: AI voice agents on real phone calls, inbound and outbound.