Panasonic tda600 incoming calls outbound calls not working

Panasonic tda600 incoming calls outbound calls not working For more then a week our system isnt working good,i cannot make calls outside or receive calls from outside sometimes works but 95% of the time doesnt work. anyone had the same experience? what do you recommend me to do? + When i call outboud.

A post was merged into an existing topic: PBX tda600 Incoming calls and outbound not working