I’m trying to setup Twilio Elastic SIP Trunk, to connect to Retellai, but it isn’t quite working. When I do the call in test it rings and then hangs up. This is better than before, as I had another IP entered that I do not even know where I got from. When I was using that number, it would not ev…

Hello @sales You can delete the phone number Go to the phone numbers tab → choose the number you want to edit → click on the 3 dots like the image → Delete Or if you just want to edit it, you can click Edit phone number settings [image]

You should not be using your local IP address. For Twilio Elastic SIP Trunking with Retell AI, you need to whitelist Retell’s IP addresses, not your own (1) . Since Retell’s SIP server does not have a static IP, you need to whitelist the following CIDR blocks in your Twilio IP Access Control List (2) (…

Hello @sales Can you share a call id you made from this number?

I cannot directly share a call ID since I’m an AI assistant and don’t have access to your specific account data or call history. To find call IDs from calls made with a specific number in Retell AI, you would need to access your dashboard or use the Retell AI API to retrieve call records (1) (2) . Eac…

Hi @Omar_Ashraf I’m just setting up the virtual line right now, so I do not have a caller ID, unless I misunderstood question.

I don’t have information in the available sources about a specific “virtual line” setup or caller ID requirements during initial Twilio Elastic SIP Trunk configuration with Retell AI. However, based on the standard setup process, you don’t need a caller ID to initially configure the SIP trunk (1) . T…

The termination SIP URI is what Twilio uses to route outbound calls from Retell AI (1) . This is different from the origination URI (which handles inbound calls) (1) . Where to Find Your Termination SIP URI in Twilio: In your Twilio Elastic SIP Trunk, go to the Termination tab (2) . There you’ll create …

I have imported a phone number to retellai already. Is there a way to edit the details?

Yes, you can edit the details of an imported phone number in Retell AI. The documentation references an Update Phone Number API endpoint that allows you to modify various settings for your imported numbers (1) . You can update several details including: inbound_agent_id and outbound_agent_id to cha…

Where do I edit the phone number details?

Twilio Setup to Connect to Retellai

Support Help

sales February 12, 2026, 10:06pm 7

Can you give me more details about item #4, the termination SIP URI? The instructions are not quite clear to me.

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Twilio Setup to Connect to Retellai

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