Im tying to pull a user manual for this thing,but i dont know what model it is. The only info i got was on a little white sticker on the side.It says E60PT REV L. The serial #is 6295475. It can accomodate 8 CO lines and 20 EXT. Anyone know what this particular model is? I need to disable ringing and co line access for line 2 at several locations.Any help is appreciated.Thanx in advance!