### Answer Based on the sources, international call transfers are not currently supported. [(1) ]() A community member confirmed: "does not support international call currently." What you should verify: 1. Number format — Ensure the transfer destination is in E.164 format (e.g.,

+33612345678

) . [(2) ]() 2. Call type — Call transfer only works during phone calls, not web calls. , [(3) ]() 3. Check your call logs — Look at the detailed logs for your call to see the specific SIP error code, which can help identify the exact failure reason. If you need to transfer to international numbers, you may want to explore custom telephony solutions or contact Retell support for updates on international transfer support.

​ To learn more, see the sources I considered: [[1] Call_transfer not working](https://discord.com/channels/1186424376300679209/1297577451341217832) [[2] Transfer call](https://docs.retellai.com/build/single-multi-prompt/transfer-call) [[3] Debug call transfer failure](https://docs.retellai.com/reliability/call-performance) ​

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