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Old 30th May 2019, 10:07 pm   #22
dagskarlsen's Avatar
Join Date: Jan 2008
Location: Hakadal, Norway
Posts: 436
Default Re: GPO/BT Call Progress Tones?

Lots of the tones are here:

Looks, or sounds like North america had one system, most of Europe another, UK a third and other countries copied one of the systems.
Exeption; Germany pre 1979 had a Morse code A as a dial tone.
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