Setup is CM4.2 with 3845VG and currently around 500 phones deployed using PoE.
We've noticed that in the last two weeks we are experiencing a few phones that appear to hang.
The symptoms are:
Phone remains powered on and network switchport continues to work
Telephone rings but one cannot answer, there is no sound etc.
Cannot make calls, when you lift the handset it shows the offhook handset icon but there is no line.
The only way to resolve is via a soft reset, but we'd like to understand what might be happening as slowly more phones are being effected.
No changes have been made to the setup recently, phone firmware is SCCP 8-0-9
Perhaps someone has come across this before.