When I received my model 33 it came with a UCC82 Call Control Unit as an extra in the deal. http://i11.photobucket.com/albums/a166/ballsandy/Computer%20related/teletype /CGS_0127.jpg (Photo of the CCU) It doesn't seem to do much on its own (makes the teletype print null characters uncontrollably when you plug the system in) and I can't find any information on what it did however just looking at it and a small note from google says it was used for putting a phone line on and off the hook and dialing. The row of buttons at the bottom controlled a Bell 101 or 103 DataPhone which you hid away in the stand. I've been searching up info on the 101 and I can't find a whole lot of anything short of it was one of the first modems, it was 110 baud and it had a D-sub 25 port that you connected it a computer/terminal with. They also seem to be about impossible to find. I have modems that cat run at 110 baud however god knows if the D-sub serial port on the back of them are the same and even if they were I have no idea how it would of connected to the teletype. Does anybody have more information?