other-emerald•2mo ago
Remove Codec?
We are experiencing background noise and audio distortion when our voice agent places outbound calls from a Belgian number (via Telnyx SIP trunk) to Belgian recipients (or Dutch recipients).
Telnyx confirmed the issue is not on their side and mentioned that the audio issue is most likely caused by codec negotiation or audio processing within VAPI. The issue is urgent because now we are missing a lot of opportunities.
✅ Could you please:
Ensure that G722 and (and maybe G729) is/are NOT used or offered during SIP/RTC negotiation.
Force usage of PCMU (G711 µ-law) or PCMA (G711 A-law) only for outbound calls.
Confirm that there is no additional transcoding or compression layer on your end.
3 Replies
Disable G722 and G729 in your Telnyx outbound settings to ensure only PCMU or PCMA is negotiated, preventing audio issues caused by codec mismatch.. https://docs.vapi.ai/advanced/sip/telnyx
other-emeraldOP•2mo ago
Hi thank you! I can only disable G722 and G729 for inbound calls. They say for outbound, it should be disabled on the VAPI side, do you know how that should be done?
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