Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.

​ To learn more, see the sources I considered: [[1] Twilio](https://docs.retellai.com/deploy/twilio) [[2] Custom Telephony Overview](https://docs.retellai.com/deploy/custom-telephony) ​

### Answer For inbound SIP origination with Twilio Elastic SIP Trunking, you need to configure Retell's SIP server address in your Twilio trunk's origination settings. [(1) ]() Retell's Inbound SIP URI:

sip:sip.retellai.com

, [(2) ]() Setup Steps: 1. In your Twilio Elastic SIP Trunk, go to the Origination settings (this handles inbound calls) [(1) ]() 2. Specify Retell's SIP server address as the origination SIP URI:

sip:sip.retellai.com

3. After configuring the trunk, import your phone numbers into Retell so the platform knows how to route incoming calls Transport Options (if needed) : - TCP:

sip:sip.retellai.com;transport=tcp

- UDP:

sip:sip.retellai.com;transport=udp

- TLS:

sip:sip.retellai.com;transport=tls

[(2) ]() The inbound SIP endpoint is the same for all accounts — it's Retell's central SIP server. No account-specific inbound URI needs to be generated. The routing is determined by the phone number you import into Retell and bind to an agent. [(1) ]() Check out these resources for more details: - [Twilio SIP Trunking Guide]() - [Custom Telephony Overview]()