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Old April 3rd 12, 10:11 PM posted to uk.railway,uk.transport.london,misc.transport.rail.americas
Charles Ellson Charles Ellson is offline
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First recorded activity at LondonBanter: Sep 2004
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Default Cell phones, British dials

On Tue, 3 Apr 2012 13:38:30 -0700 (PDT), wrote:

On Apr 3, 3:46*pm, wrote:

Nobody seems to have mentioned New Zeeland, where the 0 is in the same
place, but the other digits run clockwise round the dial, so the 5 is
also in the same place, but all of the other digits are different.
The mechanism is the same as on a normal dial, so that dialing a digit
n generates 10-n pulses.


The above was one of the challenges when international direct distance
dialing was introduced.

Would it be correct to say that when DTMF (Touch Tone) came out
everyone used the same frequencies world wide?

SSMF4 seemed to have become the accepted standard in the UK by 1972,
see e.g.:-
http://www.britishtelephones.com/tsa4258.htm
but ISTR there used to be at least some subtle differences (avoiding
clashing with other MF signals) between US and UK MF telephones
although both would fit the current ITU specification.