I guess it could be said that I have the phreaker mentality. That is all you need to know, really. (If you don't even understand that, it means that I'm curious about how telecommunications work, and I am willing to dial unusual patterns to find out.)
Have you ever wondered what the #xx and *xx codes on UW telephones do? I dialed most of them, and the results are yours for the asking. Or just download them without asking.
I have some information on the Number 3 Electronic Switching System from Bell Labs. I would put it on Wikipedia, but it's mostly original research and uncitable sources. (Is it acceptable to cite unpublished documentation?)
A partial list of Bell System Practices. These all were borrowed from the Museum of Communications, which is their permanent home.
I was treated to a tour of some of the UW's telephone infrastructure recently. I hoped to post a write-up with pictures. When I asked permission to publish it, my friend at C&C said,
Sorry Duncan, but our policies do not allow us to support or give permission for information regarding the UW voice network to be published on other sites than our official departmental site.
Pity. (I know that such statement doesn't prohibit me from publishing. I'm being considerate towards C&C, because – among other things – they treat me nicely. If I receive a few requests from visitors, I might very well post a writeup nevertheless.)
I have some documents on the history of automatic switching in Seattle. Mainly histories of the switch machines from their inception to the 1960s, and also a list of the office codes changed when Seattle cut-over from 6-digit phone numbers (LL-NNNN) to 7-digit numbers (LLN-NNNN) in 1958.
I'm also working on a description of the 1960 Morris ESS Trial. Right now all I have is audio files that I synthesized myself.