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From: motcid!charris@uunet.uu.net (Craig Harris)
Newsgroups: comp.dcom.telecom
Subject: Re: Answer Supervision on Cellular Roam Ports
Message-ID: <16017@accuvax.nwu.edu>
Date: 12 Jan 91 09:59:30 GMT
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Reply-To: Craig Harris <motcid!charris@uunet.uu.net>
Organization: Motorola Inc. - Cellular Infrastructure Div., Arlington Hgts, IL
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X-Telecom-Digest: Volume 11, Issue 29, Message 8 of 10


In article <15877@accuvax.nwu.edu> forrette@cory.berkeley.edu (Steve
Forrette) writes:
X-Telecom-Digest: Volume 11, Issue 15, Message 4 of 9

>This is something that has always bothered me.  Let's say that I'm
>roaming into a far away cellular system where my calls don't
>automatically find me.  Someone has to dial into the roamer port, then
>enter my 10 digit number to reach me.  The problem is that if they are
>calling long distance, they must pay a toll charge for each attempt,
>whether or not I'm on the air, since the call supervises at the point
>the secondary dialtone is provided.

The reason for the answer supervision on roamer access numbers is that
some of the time AT&T will not pass audio from the calling party to
the terminating party until there is answer supervision.  If the
Cellular switch did not return supervision, the calling party would
not be able to DTMF overdial your mobile number to the roamer access
port.

  This was not always the case. A few years ago, some of the long
distant companies that were buying time from AT&T would not send
supervision, but would actually complete the call and they could not
bill for those calls.

So, this was their fix to always make sure that supervision was
returned before connecting the audio path from the calling party to
the terminating party until answer supervision was returned.


Craig Harris,  Motorola Inc     1501 W. Shure Drive, IL27-2237
 ...!uunet!motcid!charris       Arlington Heights, IL 60004-1497