### Answer The call transfer node has a "When Can Transition Happen" edge that fires "when transfer fails," with a pre-populated edge available to connect to a failure-handling node [(1) ]() . This is the mechanism you're already using. On your specific questions: 1. The documentation states the transition happens "when transfer fails," but does not specify whether an unanswered/no-answer destination on a cold transfer is classified as a failure versus only hard telephony failures like an invalid number . This distinction isn't documented in the sources available to me. 2. There is a "Configure Transfer Ring Duration" setting that lets you "set how long the destination should ring for this transfer," and this value "applies only to this transfer" . This exists for all transfer modes, so it should be settable on your cold transfer node. However, the sources don't specify what happens once that ring duration is exceeded — whether it routes to the failed edge or ends the call. 3. Human detection is documented as part of warm transfer, not cold transfer: "the AI agent can attempt to detect if the other side is human, leave private messages that are not heard by the user, do a three-way introduction, etc." . Cold transfer is described only as "The call is transferred to a destination number and that's it" , with no mention of human detection. Enabling human detection would mean switching to warm transfer rather than a setting on cold transfer. 4. I don't have information confirming whether the voicemail/no-answer issue described in that community thread affects cold transfers. The sources here don't address that bug for cold transfer specifically. I don't have documented details on exactly what triggers the "transfer failed" edge for a no-answer scenario on cold transfer specifically. This behavio

r isn't explicitly confirmed in the available sources. I'd suggest opening a support ticket for a definitive answer on failure-edge triggering conditions, since this is a behavioral/backend question not covered in the docs. Would you like a general answer based on my broader knowledge instead?

​ To learn more, see the sources I considered: [[1] Call transfer node in conversation flow](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.