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From: hpubvwa!ssc!Tad.Cook@beaver.cs.washington.edu
Newsgroups: comp.dcom.telecom
Subject: Re: Telco "Customer Service" (Really DTMF to Pulse)
Message-ID: <14287@accuvax.nwu.edu>
Date: 2 Nov 90 23:41:29 GMT
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X-Telecom-Digest: Volume 10, Issue 787, Message 3 of 12


In article <14017@accuvax.nwu.edu>, CRW@icf.hrb.com (Craig R. Watkins)
writes:

> In article <13940@accuvax.nwu.edu>, oberman@rogue.llnl.gov writes:

> > What Mountain Bell (now USWest) did was put DTMF receivers on the
> > input to the switch which output pulses. So I entered the tones and
> > could hear the pulses being generated in the background. And, no, it
> > was not a pushbutton phone generating pulses. It was a phone that can
> > so either with the switch set to tone position. I could clearly hear
> > the DTMF.

> I *think* this is what was happening to me (sometimes) at the North
> Rim of the Grand Canyon in September.  It made it really difficult
> (impossible) to DISA and/or voice mail.  I think it might have worked
> once, but I couldn't figure out any possible timeouts, etc to repeat
> my success.

The telco was using a standard touchtone to dialpulse converter,
probably Mitel or Teltone, between the linefinder and the first
selector.

After the dialing is done, there are several ways to disable the
converter for end-to-end DTMF signalling.

Some of them are set up to disable the converter upon receipt of
answer supervision, in the form of a line reversal.

Some of them will accept a * from the caller to disable the converter.

Most of them will time out the converter after about 15 or 20 seconds.


Tad Cook  Seattle, WA  Packet: KT7H @ N7HFZ.WA.USA.NA  Phone: 206/527-4089 
MCI Mail: 3288544      Telex: 6503288544 MCI UW  
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