I bought a NOS 2662 A1MW to use with a 4A speakerphone; at least I thought this was the correct phone to use. The seller even included schematics but it shows only a 3B speakerphone hook-up which I'm not bright enough to figure out to be perfectly honest. Also the schematic lists a 2662AW1 to be used with the 3B. (Right now I still do not have a working KSU either.) I had hoped that I could hook it up to a 4A in a similar manner to a 2565. So here are my questions:
1. Is this the correct 2662 to use with a speakerphone?
2. Can it be used with a 4A or is it limited to a 3B?
3. Is there a special connector to use with the 3B? (Yes, I have a Model 55 control unit)


Bill