No clue about historical accuracy, but while we're on the subject
here's a wonderful archive of recordings of many of the original
announcements:
http://www.payphone-directory.org/sounds.html
I have caller ID routing through my phone system at work, and I
typically send persistent unsolicited numbers
*cough*billcollectors*cough* to the "We're sorry, you have reached a
number that is disconnected or no longer in service..."
Good luck,
RG
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