twilio-voice-outbound-calls

Call client.calls.create() with a from Twilio number, a to recipient in E.164 format, and either inline twiml or a webhook url that returns TwiML. The call object returns a sid and status such as queued, ringing, or in-progress.

Set machineDetection to Enable for immediate human/machine classification or DetectMessageEnd to wait for the voicemail beep. The AMD webhook returns an AnsweredBy value like human, machine_start, or machine_end_beep, and accuracy is roughly 85-90%.

No, answering machine detection is only available on calls made through the Calls API, not on SIP Trunking calls. SIP Trunking is intended for bringing your own carrier to reduce outbound calling costs at scale.

Error 13224 means the TwiML returned by your webhook URL is invalid, and 13225 means the URL returned a non-200 status. Fix your webhook endpoint and validate the TwiML response; the URL must also be publicly accessible.

Trial accounts can only call verified recipient numbers, so you must verify each destination or upgrade to a paid account. Inline twiml is also limited to about 4,096 characters, so longer responses require a TwiML URL.