OP
Piratepete
Ok,
If customer is deaf perhaps rationalise the phones and put in 877905 | BT Adapter Ringer | BT it has the bell set from the orginal dial telephones, it startles anyone under about 35!!
Hallo UKMeterman
He already has one of these bells! I'll see if he can do without some of the phone bells. I guess some of the phones will have a ringer off switch, otherwise disconnect the ring line. The PBX solution looks like overkill though my main concern is that he'll fiddle with it or chuck it out (He's a cantankerous old bugger!).
So...I'M STILL LOOKING FOR A REN BOOSTER. ANYONE? LOOK IN YOUR JUNK BOXES, PLEASE!
Will be there today giving the wiring a comprehensive going over, and testing line voltages, etc!
Cheers
Pete