I have a fleet of Yealink T23G phones. Many people are reporting audio issues with them. They say that the audio cuts off briefly during a conversation. Especially if two people are talking over each other (similar to duplexing issues in the old days).
When doing an echo test (*43) and making a continuous sound, the sound is only played back to me in pieces. I.e. sound - small break - sound.
I think this is the problem. I am also trying from my T20P and I don’t have the issue there.
Yealink fimrware: T23-44.80.0.95
I went back and reviewed my settings. It was not the jitter buffer that made a (noticeable) difference. It is the VAD. I turned off VAD and also CNG (because I think the comfort noise is too loud anyway) and this got rid of most of the dropouts. I suspect the VAD is too sensitive.
To test, I tried the long continuous sound test in the *43 echo tester. With VAD and CNG turned on, I got the dropouts every few seconds. With it turned off, I didn’t hear any dropouts.
I also tested by dialing to a MOH source and listening to the music for a few minutes. In two minutes, I heard a single dropout, but I don’t know whether it was because of my phone or a common Internet issue (my PBX is hosted). Regardless, the audio is significantly improved.
Seriously, we ALWAYS turn it off because the lack of Comfort Noise (the noise floor in the background) makes people think the system is dropping audio - even when it is not.