### Answer I don't have specific voicemail detection accuracy ratios or percentages for France or the US in the available documentation. The sources explain how voicemail detection works and how to configure it, but don't provide country-specific detection rates [(1) ]() . What I can tell you is that voicemail detection runs continuously within a timeout window (default 30 seconds, configurable up to 3 minutes) [(1) ]() [(2) ]() [(3) ]() . The system is optimized for real-time use and generally adds under 30ms of latency [(1) ]() . However, there are some community reports about detection challenges. One user reported issues with Polish language calls being incorrectly categorized as voicemail_reached even during human conversations [(4) ]() . Another mentioned false voicemail detection when users asked "Is this a recording?" [(5) ]() . If you're experiencing detection issues specific to France or the US, you might want to reach out to support at support@retellai.com for country-specific performance data or assistance with your particular use case [(1) ]() .

​ To learn more, see the sources I considered: [[1] Handle voicemail and IVR](https://docs.retellai.com/build/handle-voicemail) [[2] Create Voice Agent](https://docs.retellai.com/api-references/create-agent) [[3] Update Voice Agent](https://docs.retellai.com/api-references/update-agent) [[4] Incorrect voicemail detection with Polish language. POOR performance‼](https://discord.com/channels/1186424376300679209/1400851136906399885) [[5] Discord message from @musthafa1996 on 2025-07-07](https://discord.com/channels/1186424376300679209/1186462578310910112/1391909782100770856) ​

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