Northern Telecom isn't the only one guilty. It's one of my mainQuote:> In addition to all the changeover annoyance, the new system has a
>real human-factors botch: no tones are generated at the phone when
>dialing. Tones are generated after the call connects, but only for a
>fixed, short duration, so any remote device that needs long tones
>(like many answering machines) is difficult or impossible to access.
>How could Northern Telecom let such a stupid mistake out the door?
complaints about modern phone systems (my other is that they normally
do not generate a CPC [disconnect supervision] signal on analog
The Japanese telecom companies are especially guilty of this (the one
notable exception being Panasonic's KX products). I have asked them
why they do this. They point to the spec that says that touch-tones
must only be 100ms minimum duration. Yes, that's fine for dialing
into a dial-tone on a clean phone line, but not enough to interrupt an
announcement on an answering machine or voice mail system. The fact
that such systems are virtually non-existant in Japan would explain
their ignorance. I hope that as interactive voice systems become more
prevalent here that the PBX and KTS makers will mend their ways. I
figure that all it will take is for the engineer of a company to not
be able to access some service he wants to call.
But that fails to explain why a company like Northern Telecom would do
this, except that maybe it has historically been done that way. AT&T
does get it right in their systems. Mitel Supersets also work
correctly, because they have a real tone-generator in the set.
A work-around to this is to set the touch-tone length (usually it is
an option on PBXs) to something like one second. The drawback is that
dialing an 11-digit number will now take a long time to outdial.
Jim Gottlieb Info Connections, Tokyo, Japan
Fax: (011)+81-3-237-5867 Voice Mail: (011)+81-3-222-8429