### Answer When you enable human detection during warm transfer, the AI agent attempts to verify if a human is present before connecting the original caller [(1) ]() [(2) ]() . Common Human Detection Issues: If human detection fails, possible reasons include [(1) ]() : - No human was actually present (e.g., it was an IVR or voicemail) - The other party spoke, but only after the detection timeout expired - The speech was too similar to an IVR or voicemail and was not recognized as human Configuration Settings to Adjust: For warm transfers, you can configure [(2) ]() : - **Agent detection timeout**: The maximum time the AI agent will wait to determine whether the transfer target is a human . The default timeout is 30 seconds . The caller is connected only if human detection succeeds within this timeframe; otherwise, the transfer is marked as failed - **Auto-greet**: If enabled, the agent will immediately say "Hello" when the transfer target picks up, which encourages a response and increases the likelihood of detecting a human Recommendations: 1. Increase the agent detection timeout if calls are timing out before the human can respond [(1) ]() [(2) ]() 2. Enable auto-greet to prompt an immediate response from the transfer target [(2) ]() 3. Review your call logs to check the SIP connection log for specific failure reasons [(1) ]() If the issue persist

s, the human detection system may be confusing the transfer target's voice patterns with IVR/voicemail greetings .

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

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