Thanks for the info, Sam.

It's interesting, since all the other equipment seems to be attainable; the 108 speakerphone and 680 transmitter equipment seems fairly available, both at the last phone show and on ebay.

Just not the connection blocks.

I'm having some boards printed based on the 82b schematic in the 512-700-100 BSP (screenshot with some extra info added below). I'm hoping that design will work out, so I can set up my speakerphone equipment to a 2565.

[Linked Image from seriss.com]