### Answer To get your voice agent to answer a UK phone number, you need to connect a UK phone number to Retell AI through one of the supported telephony methods [(1) ]() [(2) ]() . *Option 1: SIP Trunking (Recommended) * You can connect a UK number from telephony providers like Twilio, Telnyx, or Vonage using SIP trunking . Here's the general process: 1. Purchase or move a UK number to your telephony provider's Elastic SIP Trunk [(2) ]() 2. Configure the trunk with Retell's SIP server address as the origination SIP URI:

sip:sip.retellai.com

3. Set up termination with your provider's SIP URI 4. Import the UK number into Retell using the dashboard or the Import Number API, providing the termination SIP URI and any required credentials Option 2: Direct Purchase If Retell supports purchasing UK numbers directly (availability varies by region) , you can buy one through the Retell dashboard and assign it to your voice agent. Once the UK number is connected and imported into Retell, you can assign it to your voice agent through the phone number configuration in your dashboard. The agent will then handle all inbound calls to that UK number [(3) ]() [(4) ]() . For detailed SIP trunking setup with specific providers, check out the [Twilio integration guide]() or [Custom Telephony Overview]() [(1) ]() [(2) ]() .

​ To learn more, see the sources I considered: [[1] Custom Telephony Overview](https://docs.retellai.com/deploy/custom-telephony) [[2] Twilio](https://docs.retellai.com/deploy/twilio) [[3] Get Voice Agent](https://docs.retellai.com/api-references/get-agent) [[4] Issue with Inbound Voice Agent](https://discord.com/channels/1186424376300679209/1413628905235021887) ​

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