In the Twilio console, create an Elastic SIP Trunk.
Set the termination URI and add origination pointing at Retell's SIP endpoint.
Add credentials for outbound authentication.
In Retell, go to Phone Numbers and click + β Connect to your number via SIP trunking.
Enter the number in E.164 format, the termination URI, credentials, and outbound transport.
Assign an inbound or outbound agent to the number and place a test call.
Inbound call to your Twilio number β Retell agent answers β agent sends a confirmation SMS mid-call β transcript posts to your webhook
SMS on Retell runs on connected Twilio numbers β SMS setup docs











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