atcomsystems.ca/forum Forums Other TDM Phone Systems Antique Telephones can anyone give me some info?

I did some work in an 80 year old apartment building on Friday. My customer had me remove all the old phone and cable wiring throughout the place; his security vendor ran new wire through the building. I came across several of these old intercoms in the apartments, and he let me take one of them. The only writing on it is 'Connecticut Tel and Elec. Co'
I hooked it up to my phone line at home to see if it would draw DT, and all it did was busy out the line. Unfortunately the one I got is missing the earpiece which is on a cord.