We hare experiencing an issue with the Vapi Phone Numbers when using an Agent that has the OpenAI Realtime speech-to-speech model selected. The bitrate of the audio is incorrectly set, so the agent's voice is pitched down and very slow-sounding. From the agent's perspective, the audio from the caller is pitched up and sped up. This makes the agent unusable. Example Call ID: 019d261b-5179-7000-8c05-7b93c0843e0c

Suggestion: Please verify that your agent is configured to use only supported voices for OpenAI Realtime models (alloy, echo, shimmer, marin, or cedar), as using unsupported voices can cause audio issues. Update your configuration as follows:

json
"voice": {
  "provider": "openai",
  "voiceId": "alloy" // or "echo", "shimmer", "marin", "cedar"
}

If the issue persists after confirming voice compatibility, please report the problem with your Call ID to support for further investigation. Reference: [OpenAI Realtime documentation](https://docs.vapi.ai/openai-realtime) Source: - [OpenAI Realtime documentation](https://docs.vapi.ai/openai-realtime)

We have confirmed that we are using the supported

marin

voice and the call works correctly on non-Vapi-phone transports such as web and Twilio. We have isolated the issue to Vapi Phone Numbers. My Call ID is in the original message above and this is my support ticket.

Have you been able to solve this or you still need help? @GraysonPike - OpenIntake