Spent way too many hours chasing down VoIP call quality issues recently—audio clipping, words getting cut off, inconsistent transmission—only to discover the culprit was Yealink Voice VAD (Voice Activity Detection).
If you're running Yealink phones (in my case, T54W) with FusionPBX, this is worth checking.
Fix (FusionPBX):
Advanced → Default Settings → Provision → yealink_voice_vad
Set value to 0 (disabled)
Or directly on the phone (Yealink T54W):
Settings → Voice → VAD → OFF
After disabling it, call quality immediately improved.
You may also want to experiment with turning off some of the other Yealink voice processing features depending on your environment—they can sometimes do more harm than good.
Hopefully this saves someone else a few hours (or days) of frustration.
If you're running Yealink phones (in my case, T54W) with FusionPBX, this is worth checking.
Fix (FusionPBX):
Advanced → Default Settings → Provision → yealink_voice_vad
Set value to 0 (disabled)
Or directly on the phone (Yealink T54W):
Settings → Voice → VAD → OFF
After disabling it, call quality immediately improved.
You may also want to experiment with turning off some of the other Yealink voice processing features depending on your environment—they can sometimes do more harm than good.
Hopefully this saves someone else a few hours (or days) of frustration.