​ To learn more, see the sources I considered: [[1] Import Phone Number](https://docs.retellai.com/api-references/import-phone-number) [[2] Connect AI call agent to Zendesk](https://www.retellai.com/integrations/zendesk) ​

### Answer Yes, you can import phone numbers into Retell AI from custom telephony providers. [(1) ]() Retell supports importing numbers through their API using the

/import-phone-number

endpoint. To import a phone number, you'll need to provide the phone number in E.164 format and a termination URI that uniquely identifies your SIP trunk. For example, with Twilio elastic SIP trunks, the termination URI always ends with ".pstn.twilio.com". Here's the code example for importing a phone number:

javascript
import Retell from 'retell-sdk';
const client = new Retell({
 apiKey: process.env['RETELL_API_KEY'], // This is the default and can be omitted
}) ;
const phoneNumberResponse = await client.phoneNumber.import({
 phone_number: '+14157774444',
 termination_uri: 'someuri.pstn.twilio.com',
}) ;
console.log(phoneNumberResponse.inbound_agent_id) ;

You can also configure optional authentication credentials (

sip_trunk_auth_username

and

sip_trunk_auth_password

) and bind agents to the number for inbound or outbound calls. While Zendesk integration is mentioned as available through custom API integrations or Retell's integration partners [(2) ]() , the specific process for porting numbers from Zendesk would depend on your telephony provider setup.

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