Hello. I am administering a Mitel 3300 ICP. On some days, the screens of some of the Mitel IP phones, on the network, go blank with the backlight on (i.e. they are powered on and dialing these extensions from a working IP phone shows the "OUT OF SERVICE" message. I checked the computers which are connected to these affected IP phones and the network connection of these computers are working fine e.g. they can access the internet.
I have also noticed that the switches, which the affected IP phones connect to, show solid LEDs when this problem is experienced. This is temporarily fixed by restarting the switches, where the LEDs start flashing again and the screens of the affected IP phones are not blank anymore (they correctly show the "LOGGED OUT" message for ACD extensions and the date and time for non ACD extensions).
What could be causing some of the IP phones' screens to go blank? I would like to find the source of the problem so that it can be permanently fixed.
I have also noticed that the switches, which the affected IP phones connect to, show solid LEDs when this problem is experienced. This is temporarily fixed by restarting the switches, where the LEDs start flashing again and the screens of the affected IP phones are not blank anymore (they correctly show the "LOGGED OUT" message for ACD extensions and the date and time for non ACD extensions).
What could be causing some of the IP phones' screens to go blank? I would like to find the source of the problem so that it can be permanently fixed.