description Twilio Programmable Voice API Overview
Focusing specifically on voice, this API allows developers to build sophisticated, automated phone systems. You can programmatically create IVRs, integrate with CRM data to personalize calls, and build complex conversational flows without needing physical telephony hardware. It is the go-to solution for modernizing customer service phone trees.
help Twilio Programmable Voice API FAQ
How does Twilio Programmable Voice decide what happens during a call?
Your application returns TwiML instructions telling Twilio to perform actions such as speaking with <Say>, collecting input with <Gather>, or connecting another party with <Dial>. An outbound call begins with a POST request to Twilio's Calls resource.
Can Twilio Programmable Voice connect normal phones, browsers, and SIP systems?
Yes. Twilio can route calls among telephone numbers, browser or mobile clients using its Voice SDKs, and SIP domains, allowing one application to bridge internet and public telephone endpoints.
Does Twilio charge only for the phone number?
No. Programmable Voice uses pay-as-you-go pricing based on call direction, destination, duration, and optional features, while rented Twilio numbers have separate recurring charges. Recording, transcription, conferencing, and answering-machine detection can add further usage charges.
What must be secured before a Twilio Voice app goes live?
Production requests should use API keys rather than exposing the Account SID and Auth Token in client code. Applications should also validate Twilio's signatures on incoming webhooks, because those endpoints control live call behavior.
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