dtmf

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> > Correct, and don't forget about A, B, C, D (flash override, flash, priority
> > and <I forget>) -- four more valid DTMF sequences...
> 
> Yes, all modems seem to be able to dial them, but they're pretty useless
> on my isdn pbx. It doesn't even seem to detect them. What happens if
> you dial them on a "regular" exchange?

Most telco switches (and PBX equipment) ignore it. The only things I've
seen that use the ABCD 'hooks' are automated telephone-operated equipment;
at least one automatic switch box uses them (you dial in with your modem, 
and then on connect, you get another dialtone; send the 'A'..'D' based on
which of four servers you wish to connect to.)

I haven't seen any recent application of them...

(The solution to the problem of running out of phone numbers in the US?)

joe
.