I am experiencing a very low volume of the incoming side of the call.
It happens intermittently during the call, eg the volume starts normal, a couple of minutes hardly to hear and than suddenly the volume is at normal level.
Issue appears on several extensions. Also on a call with another FreeBX.
The configuration worked wel for five months until now.
Asterisk 11.17.1 R1
all extensions are VoiP Tiptel 3220.
Can anyone tell me in what area to look for an answer.