I use voicemail detection with the following configuration:

voicemailDetection: {
  provider: 'vapi',
  beepMaxAwaitSeconds: 15,
},

and I saw in the logs that the call detected as voicemail but the ended reason is "Customer Did Not Answer". call id: 8704f10f-37ca-4ffd-9b64-188133747522

Here are some improvements you can make to your system prompt. https://cdn.discordapp.com/attachments/1383756053136806028/1384325655554031626/nia_prompt_improvement.json?ex=6852053b&is=6850b3bb&hm=3919e6e3623a60107ccc37c0df5b4e1a296365d1692b3cd6e53010bf16985c37&