Zack
12/17/2025, 2:39 PMZack
12/17/2025, 2:39 PMVapi Support Bot
12/17/2025, 2:40 PMcall.in-progress.error-assistant-did-not-receive-customer-audio means the assistant did not receive any audio from the customer, often due to missing microphone permissions or audio input issues.
To resolve this, ensure that the user has granted microphone access and that their device is sending audio correctly.
Example checklist:
- Confirm browser/device microphone permissions are enabled
- Test audio input with another app to verify functionality
- Check for any network/firewall restrictions blocking audio streams
If the issue persists, review your call logs for more details or contact support with the affected Call IDs for further investigation.
Source:
- [Call ended reasons documentation](https://docs.vapi.ai/calls/call-ended-reason)Zack
12/17/2025, 3:06 PMQper
12/17/2025, 6:44 PMRajesh B K
12/22/2025, 1:27 PMZack
12/24/2025, 3:38 PMVapi Support Bot
12/24/2025, 3:39 PMCall IDs: [list of IDs]
Issue: High volume of `call.in-progress.error-assistant-did-not-receive-customer-audio` on voice calls
Description: Many calls are failing with this error, but some succeed.
This will help the support team analyze backend logs and identify any systemic issues.
See: [Call ended reasons documentation](https://docs.vapi.ai/calls/call-ended-reason)
Source:
- [Call ended reasons documentation](https://docs.vapi.ai/calls/call-ended-reason)Chiranjeet Mishra
01/08/2026, 4:54 PMcall.in-progress.error-assistant-did-not-receive-customer-audio reason. This happens when Vapi does not receive any audio data from the provider. SInce you used telnyx in this setup, try contacting telnyx regarding this issue.
As an alternative, try using another provider and check whether you are seeing the same issue or not.