​ To learn more, see the sources I considered: [[1] Connect a Twilio number to Retell with elastic SIP trunking](https://docs.retellai.com/deploy/twilio) [[2] Connect Retell voice agents to custom telephony](https://docs.retellai.com/deploy/custom-telephony) ​

### Answer For your Twilio elastic SIP trunk, the origination SIP URI (inbound setting) needs to point to Retell's SIP server address:

sip:sip.retellai.com

[(1) ]() [(2) ]() . If your trunk's origination URI is currently set to a

sip.livekit.cloud

address, you'll need to update it in Twilio to

sip:sip.retellai.com

instead [(1) ]() . This handles inbound calls flowing from Twilio into Retell [(2) ]() . Note that origination and termination are configured separately : - **Origination (inbound) **: calls from Twilio into Retell — set this to

sip:sip.retellai.com

[(1) ]() [(2) ]() - **Termination (outbound) **: calls from Retell out through Twilio — Twilio gives you a termination SIP URI, which you then supply to Retell when importing the number (not something you change on Twilio's side) So updating the origination URI in your Twilio trunk settings to

sip:sip.retellai.com

should be the main step here [(1) ]() . Your termination setup and number import into Retell should remain unaffected unless the email specifies otherwise. If you run into issues after switching, verify that your termination SIP URI doesn't contain extra spaces and that you're using a localized termination URI near your region .

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

### Answer The documentation specifies to set the origination SIP URI to

sip:sip.retellai.com

for inbound calls [(1) ]() , but it doesn't specify what priority or weight values to use for that trunk origination setting. I don't have documented information on the correct Priority or Weight numbers for this Twilio configuration field. Since these are Twilio-side trunk settings, I can't confirm specific values from the sources available to me. Check out these potentially useful sources: [Connect a Twilio number to Retell with elastic SIP trunking]() , [Elastic SIP Trunk Busy Signal]() Would you like a general answer based on my broader knowledge instead?

​ To learn more, see the sources I considered: [[1] Connect a Twilio number to Retell with elastic SIP trunking](https://docs.retellai.com/deploy/twilio) ​

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