First post here. So forgive me if I don’t have enough information.
I have about five or six people reporting that some incoming calls have no sound when they pick up the handset. The call is stays active until one of the two parties hangs up. Two of the users say it happens anytime they get a call from someone using a cell phone.
I have not found anything in the software or maintenance logs. The server does a monthly reboot, which was a week after this started.