Telephone Technology - 1940s - USA

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[@Mattipedersen]

I work in the Information Technology field and it is always a privilege to have the opportunity to see how parts of my job, today (Voice Over IP & Internet Telephony, etc) were performed, in the past.

[@Admiral8Q]

It really is amazing how far communication has come along since this film in the 1940's. Even from the 1980's to today, the leap is incredible!

[@byrd56]

4:52--Those keypulsing sounds are the forerunners of the later touch-tones. 5:35--So "312" was the Chicago area code before there was such a thing as dialing direct by long distance.

[@JMan6271]

oh cool, thank you

[@scottk8245R]

Pretty impressive for the time

[@gautamdamodaran]

DTMF. Isn't it?

[@Mattipedersen]

DTMF wasn't officially implemented until 1963. However, it is obviously based on the same concept. The only real difference being that instead of an Operator sending Dual-Tone Instructions to the Circuit Switch the Caller's Phone itself is able to Output those Dual Tone Instructions, as the Caller Dials.

[@bdm1019]

Multi frequency