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| Re: A ''Shocking'' Lawsuit (1393717) | |||
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Re: A ''Shocking'' Lawsuit |
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Posted by Stephen Bauman on Tue Apr 26 23:57:15 2016, in response to Re: A ''Shocking'' Lawsuit, posted by Dyre Dan on Tue Apr 26 06:15:31 2016. Some of the 1960's tone changes had to do with direct international dialing. Each country had different tones. The person making the call had to interpret the different tones correctly. Some country's ringing signal was interpreted as a busy signal. Result: the caller hung up even though the call went through.The biggest problem was the French transfer tone which had no US equivalent. Its purpose was to tell the caller the call went through before the phone rang. Something like 90% of US callers thought it was a busy signal. The various countries settled on a new set of tones that were less confusing but still close to the original ones. US signalling between CO's and above was tone and not pulse from the 1940's on. It was in band signalling until blue boxes became fashionable. |
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