### Answer Unfortunately, Retell AI currently only supports purchasing US and Canada numbers and supports making calls to 15 countries. [(1) ]() For numbers from other countries like South Africa, the documentation recommends using Custom Telephony. With Custom Telephony, you can: - Use your own telephony provider (such as Twilio, Telnyx, Vonage, or others) that supports South African numbers - Import those numbers into Retell AI This approach allows you to work with numbers from countries not directly supported by Retell's built-in phone number purchasing. Check out the [Custom Telephony guide]() referenced in the documentation for detailed setup instructions.

​ To learn more, see the sources I considered: [[1] Purchase phone number](https://docs.retellai.com/deploy/purchase-number) ​

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

@AI Evy any other option?

### Answer Based on the available documentation, Custom Telephony is the primary option for using numbers from countries not directly supported by Retell AI's built-in purchasing. [(1) ]() There are two methods available: 1. *Elastic SIP Trunking (Recommended) * – Set up a SIP trunk with a provider that supports South African numbers (like Twilio, Telnyx, or Vonage) , then import that number into Retell. 2. Dial to SIP URI – If your provider doesn't support elastic SIP trunking or you have a more complex setup, you can dial calls to a specific SIP URI (

sip:sip.retellai.com

) . Both methods allow you to use your own phone numbers from any telephony provider that supports your region. If you need help with SIP trunking setup, Retell has partnered with [Jambonz]() , which already connects with Retell and offers dedicated support for Retell users. Unfortunately, there isn't a simpler alternative documented for unsupported regions—Custom Telephony is the path forward.

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

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