"Intrestingly, wiring diagram on triple Amp cords are kept consistent with standard 5-line models. So what I need is just to connect the Amp #1 of Call Director to my regular 5-line 1A2 plug and the first key strip works + ringer, etc. work perfectly fine."
That was the whole idea with 1A2 - consistency and the ability to upgrade. You had 5 line phones and business got better- runs another cable and change to the next model.
When the K-10 (830?) model was introduced you could upgrade from a 5 line to a 9 line with minimal wiring changes. Unplug the 564 and plug in in the 9 line and it worked! Of course your intercom was now on line 5 and not on line 9, but that was incidental, Move the intercom, remove the A1 leads from lines 2-4 and you were in business to add more lines. Buzzer and ringer leads stayed the same.
Sam
"Where are we going and why are we in this hand basket?"
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