Hi, I need help with one-way audio on inbound phone calls. When someone calls my phone number, my assistant answers and the caller hears the greeting, but the caller's voice never reaches Vapi. The user transcript stays empty and the bot does not respond. I use Telnyx as the carrier. Their support confirmed the calls connect and complete correctly on their side, so the problem seems to be in the audio path between Telnyx and Vapi. The assistant works perfectly in the Vapi web test, so it only happens on real calls. How can I fix the inbound audio not reaching Vapi?

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Since callers can hear the greeting, it sounds like the call is connecting properly, but the caller's audio isn't making it from Telnyx to Vapi. I've seen this happen before when there's an issue with the media stream configuration, codec settings, or how the inbound audio is being passed through. A good place to start would be checking the Telnyx and Vapi call logs to see whether Vapi is receiving any inbound audio events at all. Have you already looked into that, or tested with a different Telnyx number to rule out a number-specific issue? @Romano Aspas

Hi, can you please share your call id