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Evy Where do I find my origination URI
# ❓・ai-evy-support
a
@AI Evy Evy Where do I find my origination URI? I currently have sip:sip.retellai.com but there is no answer when I dial the phone number. Twilio is reporting the line as "No Answer"
a
Thanks for tagging me @andrewtraub. I'll look through relevant sources and get back to you shortly.
### Answer --- The origination SIP URI for Retell is 
sip:sip.retellai.com
. [(1) ]() However, if you're using TLS transport, you need to append the transport method to the URI. The supported formats are: - **TCP**: 
sip:sip.retellai.com;transport=tcp
- **UDP**: 
sip:sip.retellai.com;transport=udp
- **TLS**: 
sip:sip.retellai.com;transport=tls
Troubleshooting "No Answer" issues: 1. Check your origination settings in Twilio's Elastic SIP Trunk configuration. Make sure the origination URI is correctly set. 2. Verify the number is imported into Retell — after setting up the SIP trunk, you need to import the number to Retell so it knows how to route the call. 3. Ensure an agent is bound to the number — inbound calls won't connect if no agent is assigned. 4. Check Twilio trunk settings — make sure "Code Transfer" is enabled and "Enable PSTN Transfer" is checked. [(2) ](

▾

) There have been some intermittent SIP connectivity issues reported by users. If the problem persists, check the logs in your Twilio dashboard and consider opening a support ticket. [(7) ]()
​ To learn more, see the sources I considered: [[1] Custom Telephony Overview](https://docs.retellai.com/deploy/custom-telephony) [[2] Retell AI - Connect to your own Twilio - Using Sip Trunking](

https://www.youtube.com/watch?v=JC3PV_R-Z1Y▾

) ​
Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.
a
Adding ";transport=tcp" did not change anything. The other items appear correct but there is no "Code Transfer" option - did you mean "Call Transfer" (which is enabled)?
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