I'm not familiar with the V-110RT, but if it's like all the other pre-packaged intercom units it has nothing to do with the 4 card slots in the KSU.

As you suggest, you should install a separate 66 block and connect the intercom to it. Provide power and then connect to the phones on line 5.

The number of phones you have on a system has nothing to do with the number of card slots in the KSU. You can have two CO lines, a 401PA to access a Public Address system and a 415 card for a tie line and have those lines appear on 10 phones.

Sam


"Where are we going and why are we in this hand basket?"