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When did the beeping tones you hear in a receiver when you pick up the phone or when the line is busy become a standard?
asked in phone, beep, tone
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| Kayce_1987 answers: I'll say the 1980's possibly. 3 years ago / reply
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| nivetha answers: The dial tone was introduced by Siemens in 1908 in germany.
I would guess the busy tone was standardised between 1890s and 1910s when automatic switching and telephone exchanges came about.
http://www.seg.co.uk/telecomm/automat1.htm 3 years ago / reply
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