Hello VAPI team, I’m experiencing an intermittent issue with outbound calls. I’ve set up a new phone number in my Twilio account and linked it to VAPI so that my assistant can make outbound calls. The problem is that, in many cases, when I answer the call, I hear nothing — and the call record ends with either “silence timed out” or “customer did not answer.” However, sometimes the calls work as expected. Here are the details: • Assistant ID: 39afe167-6ef2-47a3-9e48-a14ae768bdf0 • Phone Number ID: e1ddd42c-bccb-42b1-b183-6ff93b15c542 Calls that worked: • 4794117c-5fa8-4b6c-aedd-f5e0ed0db78c • ca98fe9e-8318-4155-b2f8-49d63463224c • 7bf60aa7-6e52-4d54-b7bf-803e70897040 • eb2696d9-a2ab-4574-8d25-a0b6b3074b85 Calls with silence errors: • 56b04ed3-49e4-42bb-bc92-85d584a1cad3 • d498facf-4a1f-4b95-bdd2-54ac8976f577 • 15f0996c-ada0-4c30-82de-b9a5ac6df3ef • 74d36d9b-baac-4768-a590-10b72ef9db10 Could you please help me investigate this issue? Thank you!

A common workaround for intermittent audio issues and "silence timed out" errors in VAPI outbound calls is to switch your transcriber (speech-to-text provider) from Deepgram to Azure or Whisper (via Talkscribe). Many users have reported that this resolves or improves the issue. You can update your transcriber in your VAPI configuration—here’s an example API call to set the transcriber to Azure:

json
{
  "transcriber": "azure"
}

Try this change and monitor if the issue persists. [Reference](https://discord.com/channels/1211482211119796234/1343612796717371393) Source: - [Discord: VAPI outbound call intermittent audio issue troubleshooting](https://discord.com/channels/1211482211119796234/1343612796717371393)

Hey, Could you please schedule a brief call at your convenience so we can discuss this matter in detail? Kindly use the following link to book a suitable time: .