Grandstream Codec Issue
Symptoms: For an inbound call, there is one-way outbound audio from the affected Grandstream handset. The caller can hear the callee, but the audio is garbled. Outbound calls from the Grandstream handset work normally.
Issue: The Grandstream handset has not selected a compatible audio codec during an inbound call and has resulted in broken audio.
Fix: Changing the handset to use the audio codec from the caller will result in selecting a compatible audio codec.
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Using the IP Address of the phone, enter the IP Address into your browser
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Log into the phone WebUI, then select “Account 1" (or the account NEWT Cloud is configured on)
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Select "Audio Settings” from the top menu bar
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Change the feature “Use first matching vocoder in 200OK SDP” to “Yes”
- Ensure SRTP Mode is "Enabled and Forced"
- Click on Save and Apply