As I remember it the 2564 was meant for speakerphone setup with T,R,A,A1 going out on the violets, with the speakerphone wired through the hookswitch, or something of the sort, been a few years. The 2565 was the same set without the violet pairs.
Willing to share what I've learned in my past 40 years dealing with both ends of the phone line. Competent (Ihope) on Norstar, competent on Harris 20-20.
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