### Answer Based on the available documentation, the current SIP trunk configuration supports a single termination URI per phone number [(1) ]() [(2) ]() . When importing or updating a phone number with custom telephony, you specify one

termination_uri

along with optional authentication credentials . For inquiries about supporting multiple termination URIs for SIP redundancy, I recommend reaching out through: - **Enterprise Plan Contact**: - This is the best channel for discussing custom requirements and advanced telephony features - **Discord Community**: - For community discussions and support - **GitHub**: - For technical discussions Multiple termination URIs for failover/redundancy would likely be an enterprise-level feature request, so contacting through the enterprise plan link would be your best path forward for this specific requirement.

​ To learn more, see the sources I considered: [[1] Import Phone Number](https://docs.retellai.com/api-references/import-phone-number) [[2] Update Phone Number](https://docs.retellai.com/api-references/update-phone-number) ​

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