Hi guys, i've just discovered this forum and really hoping someone could point me in the right direction.

I have a DSC 816 Analogue system that was installed about 3 years back and which was working perfectly till this morning.

Calls would suddenly start cutting out with a a soft click and the software version number being shown on every telephone screen. Turning the main system on and off at the mains seemed to reset this and fix it. Till a few hours later. I tried the same routine except this time it has failed to work.

"Ver 2.2
2003 4.30" is all that is shown, with more clicking, no dial tone and I can't do anything to get past this.

Is there anything really obvious I should check?

(I'm not an installer, semi end-user/administrator here, the company who installed the system went bust last year and I am completely stuck)

Many thanks in advance,

Jas