Do we have a way to detect if a forwarding went through the voicemail or not, is the voicemail detection only for outbound calls or can they also work for inbounds

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Yes, Vapi's voicemail detection can be used for both outbound and inbound calls. To enable voicemail detection, add the following to your assistant configuration:

json
"voicemailDetection": {
  "provider": "vapi",
  "backoffPlan": {
    "startAtSeconds": 2,
    "frequencySeconds": 2.5,
    "maxRetries": 5
  }
}

This will detect voicemail regardless of call direction, but specific detection after forwarding is not explicitly documented. For more details, see the [Vapi voicemail detection documentation](https://docs.vapi.ai/calls/voicemail-detection). Source: - [Vapi Voicemail Detection Documentation](https://docs.vapi.ai/calls/voicemail-detection)

How can i know if the voicemail was successful

When using automatic voicemail detection, the system will automatically deliver your configured

voicemailMessage

when voicemail is detected. The call will end automatically after message delivery.