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

### Answer Based on the available sources, there isn't a built-in native feature in Retell AI to automatically route calls to a backup number when Retell is down. However, there are workarounds you can implement at the telephony provider level: [(1) ]() 1. **Primary webhook failover via Twilio**: Set up a

new-incoming-call

webhook and a

webhook-failed

webhook via Twilio. When dialing the SIP endpoint fails, it can route to a backup number. 2. Sequential ring approach (less efficient) : Configure your primary number to pick up and try to ring your Retell number for a set time (e.g., 30 seconds) , and if there's no answer, route to another backup number. These configurations would need to be set up through your telephony provider (like Twilio) rather than directly within Retell AI. For more details on Retell's reliability and uptime guarantees, you can check their [Status Page]() to monitor for any issues. [(2) ]()

​ To learn more, see the sources I considered: [[1] Discord message from @trill_og.sol on 2025-10-09](https://discord.com/channels/1186424376300679209/1186462578310910112/1425958425564549181) ​