​ To learn more, see the sources I considered: [[1] Unable to add number for my bot](https://discord.com/channels/1186424376300679209/1411268663247634473) [[2] Custom Telephony Overview](https://docs.retellai.com/deploy/custom-telephony) [[3] Import Phone Number](https://docs.retellai.com/api-references/import-phone-number) ​

### Answer Retell AI does not directly sell Singapore phone numbers [(1) ]() . However, you can use a Singapore number with Retell AI by purchasing one from a telephony provider that supports SIP trunking and then connecting it to Retell AI [(2) ]() [(1) ]() . To use a Singapore number with Retell AI: 1. Purchase a Singapore phone number from a telephony provider that supports elastic SIP trunking [(2) ]() . Providers like Telnyx or other providers that support SIP trunking will work with Retell AI [(1) ]() . 2. Set up a SIP trunk with your telephony provider and configure your number to point to it [(2) ]() . 3. Import that number to Retell AI using the Import Phone Number API [(3) ]() . The phone number must be in E.164 format (e.g., "+6512345678") . The recommended integration method is elastic SIP trunking, which allows you to connect Retell's VoIP with PSTN so your agents can make and receive calls [(2) ]() . When using this method, all telephony functionalities supported by Retell numbers will also be supported, assuming your telephony provider supports them .

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