Prof. Susan Crawford is doing something that I've always wanted to do: delve deep into the history of telephony. Good stuff ... hope she uses her blog to keep her notes (Telephony and We're Keeping Guard Over Your Loved Ones).

In advertisements spanning the years between 1907 and 1958, the Bell System used emergencies as a key sales point to get people to buy telephones. Much of the usefulness of the telephone, as advertised, was that it was there, that it was watching over you. You weren't so much interacting as being guarded. The telephone, that magnificent instrument, was silently keeping you safe. ....

The ties to the E911 controversy I've been focusing on are obvious. An important part of joining the telephony network was gaining the ability to tell other people when you were in trouble. [emphasis in original]