Computer telephony integration (CTI)
Computer telephony integration (CTI) connects a telephone system with business software so applications can receive call events, control call actions, and use caller context.
A CTI layer turns telephony activity into information another application can act on. When a call arrives, the phone system may emit the caller's number, the number dialed, routing status, and other event data. A connected application can use those details to find a customer record, open the appropriate screen, or prepare a workflow for the answering agent.
The connection also works in the other direction. Depending on the implementation, a user may click a number in a business application to place a call, answer or transfer from an on-screen control, or save a disposition when the call ends. Events and controls may move through APIs, webhooks, browser components, or a vendor-specific connector.
CTI is broader than a screen pop and narrower than a complete contact-center operation. A screen pop is one visible result of CTI. A CRM integration may use CTI data, but it can also synchronize records unrelated to calls. The practical question is which call events and actions the connected systems actually support.
Why it matters for AI phone calls
An AI phone agent often needs information beyond the telephone connection. CTI can help a workflow associate a call with the correct record, retrieve permitted context, trigger a supported action, and write the outcome back to another system. That can reduce manual lookup and make a later human handoff more useful.
The design needs clear boundaries. A matched phone number is not always proof of identity, and an AI agent should not receive every field simply because the integration can expose it. Teams should define which data is needed, when stronger verification is required, and what may be included in a transcript, summary, or transfer brief.
Reliability matters as much as the normal flow. If the customer system is slow or unavailable, the call still needs a safe path. Duplicate events should not create duplicate records, and retries should not repeat an irreversible action. Testing should cover mismatched records, missing identifiers, delayed events, and transfers as well as clean first-time calls.