Matt: Glad you found it. Now, let's get back to how you have your single line telephones ("SLT's") wired into your system.
There are two ways, the right way and, you guessed it! the Bell System Way.
The SLT's need to be converted to A-lead control, and they need to be wired into your system, AFTER the line cards, not BEFORE.
This method will ensure that if a key set is used first, then an slt is picked up, then, finally, the key set is put on hook, there will be no false hold condition.
Another advantage will be on an incoming call, if the call is answered by an slt, the system ringing will stop, and the line lamps will go from flashing to steady.
You will need to convert each slt for A-lead control, and then run their wires to the output of the KSU. More than one slt can be wired to the same pairs, by the way. They do not need to be home-runs, if that helps.
