​ To learn more, see the sources I considered: [[1] Twilio](https://docs.retellai.com/deploy/twilio) [[2] Custom Telephony Overview](https://docs.retellai.com/deploy/custom-telephony) ​

### Answer To use Guam numbers with Retell AI, you'll need to connect via SIP trunking with a telephony provider that supports Guam numbers [(1) ]() [(2) ]() . Here's how: 1. Purchase a Guam number from a telephony provider like Twilio, Telnyx, or Vonage that offers Guam coverage 2. Set up Elastic SIP Trunking with your provider: - Create a SIP trunk in your provider's console [(1) ]() - Configure termination settings (for outbound calls) with the provider's termination SIP URI - Configure origination settings (for inbound calls) pointing to Retell's SIP server:

sip:sip.retellai.com

[(1) ]() [(2) ]() 3. Move your Guam number to the elastic SIP trunk you created [(1) ]() 4. Import the number to Retell by providing the termination SIP URI from your provider For international dialing setup with Twilio specifically, you'll need to configure Voice Geographic Permissions to enable calling to Guam and other international countries . If your provider doesn't support elastic SIP trunking, you can use the alternative "Dial to SIP URI" method where you dial calls to Retell's SIP server address:

sip:sip.retellai.com

[(2) ]() .

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