[comp.dcom.telecom] DTMF vs TouchTone

nigel@CC.IC.AC.UK (Mad Nige) (12/30/88)

Over the last few issues, there has been a lot of discussion about
whether or not TouchTone is a trademark, and if it is the same as DTMF.

Here in the UK, the System-X exchanges will accept tone dialling, and
no charge is made for using it. Unfortunately, there aren't that many
System X exchanges around. Some of the payphones in London use tone
dialling, but I've not come across many more elsewhere.

Initially, British Telecom referred to tone phones as having MF
dialling, and sometimes (especially in their in-house magazine) as
DTMF. The latest range of phones that they have brought out have
stickers on them saying that they are TouchTone(TM) compatible. Perhaps
it's still a trademark in the UK.

Incidentally, although System X has tone dialling (and other nice
features that I can list if anyone's interested), it does seem to
behave rather unpredictably. I lives for about 6 months in a flat with
a line to a local System X exchange, and quite often would come home to
find that the exchange had left messages on my answering machine that
said "Sorry. You have dialled incorrectly. Please replace the handset
and try again."

I see we've found a way to bring about the downfall of the USSR. We've
sold them System X...

Nigel Whitfield.
----------------
nigel@cc.ic.ac.uk	nigel%mvax.cc.ic.ac.uk@cunyvm.cuny.edu
or even			...mcvax!ukc!icdoc!mvax.cc.ic.ac.uk!nigel
zmacz02@doc.ic.ac.uk	...mcvax!ukc!icdoc!zmacz02