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

### Answer --- The call transfer feature only works during phone calls, not web calls or test chats. [(1) ]() Since "test chat" in the conversation flow is a web-based simulation, the transfer call function won't actually execute—it's designed specifically for phone calls. To test transfer failure scenarios, you would need to: 1. Make actual phone calls and configure conditions that would cause a failure (e.g., invalid transfer number, unreachable destination) 2. Check SIP connection logs in your call logs after a failed transfer attempt to diagnose the failure reason [(2) ]() Common reasons transfers fail include telephony issues (similar to outbound call failures) or, if human detection is enabled, failure to detect a human at the transfer destination. If you need to test your flow's behavior when a transfer fails, you'll need to use real phone calls rather than the test chat feature.

​ To learn more, see the sources I considered: [[1] Transfer call](https://docs.retellai.com/build/single-multi-prompt/transfer-call) [[2] Debug call transfer failure](https://docs.retellai.com/reliability/call-performance) ​