### Answer To connect your Retell AI agent to a Saudi Arabia phone number, you'll need to use Custom Telephony via SIP Trunking since Retell currently only supports direct purchase of US numbers. [(1) ]() Here are your options: Option 1: Elastic SIP Trunking Connect your existing Saudi phone number through a telephony provider that supports SIP trunking (like Twilio, Telnyx, or Vonage) . [(2) ]() This allows you to route calls from your local Saudi number to Retell's system over the internet using SIP protocol. Option 2: Dial to SIP URI If your telephony provider doesn't support elastic SIP trunking, you can use this method where your system dials calls to a Retell SIP URI. You would call the Register Phone Call API to get a

call_id

, then use the SIP URI format:

sip:{call_id}@sip.retellai.com

Option 3: Port Your Number Some telephony providers like Twilio allow you to port your existing number to their system, after which you can use it with Retell via SIP trunking. [(3) ]() Getting Help If you need international inbound numbers, Retell has app partners like [Jambonz]() and [Llamada IP]() that can assist with international number setup. [(2) ]() , [(4) ]() Check out these resources for setup guides: - [Custom Telephony Overview]() - [Twilio SIP Guide]() - [Telnyx SIP Guide]()

​ To learn more, see the sources I considered: [[1] Create Phone Number](https://docs.retellai.com/api-references/create-phone-number) [[2] Custom Telephony Overview](https://docs.retellai.com/deploy/custom-telephony) [[3] Phone numbers](https://discord.com/channels/1186424376300679209/1278412505177260054) [[4] Discord message from @dcphealth_99900 on 2025-08-27](https://discord.com/channels/1186424376300679209/1294891368505937952/1410406226956914829) ​

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