Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!hayes!tnixon
From: tnixon@hayes.uucp
Newsgroups: comp.dcom.modems
Subject: Re: PP9600SA and V.32 questions (dumb!)
Message-ID: <3747.279dcc02@hayes.uucp>
Date: 23 Jan 91 17:46:42 GMT
References: <1991Jan23.015246.3728@hoss.unl.edu>
Distribution: comp
Organization: Hayes Microcomputer Products, Norcross, GA
Lines: 33

In article <1991Jan23.015246.3728@hoss.unl.edu>, ho@hoss.unl.edu
(Tiny Bubbles...) writes: 

> 	I have cancellable call waiting;  if I dial *70 before a call,
> it is immune to the little "beeps."  Currently, I have one of the S-
> registers on the modem programmed to hang up as soon as it gets a beep,
> thus killing the data connection and letting the voice call ring through.
> If I have an important or expensive data connection, I just have the
> computer dial *70 for me before the call.
> 
> 	Obviously, this is useless under V.32 (what, line noise?  let's
> ignore it and ask for a retransmit).  But if I have a "normal" line
> (no MNP, no LAPM, no V.32), can I still maintain my relative "voice higher
> than data" priority?  Does that S-register do its stuff if the correction
> protocols are disabled?

Perhaps you're talking about V.42 (error control) rather than V.32 
(modulation).  A V.32 modem may, in fact, disconnect on a call 
waiting beep -- depends upon the implementation.  The process 
controlled by S9/S10 (detection of carrier loss) operates 
independently of V.42 or MNP error control -- if you have error 
control active and the underlying modem detects loss of carrier, the 
call is terminated, pure and simple.  

The best thing you can do is TRY IT.  I'll bet that most V.32 modems 
will, if S9/S10 are set accordingly, disconnect on a call-waiting 
interruption, even when error control is active.

-- 
Toby Nixon, Principal Engineer    | Voice   +1-404-449-8791  Telex 151243420
Hayes Microcomputer Products Inc. | Fax     +1-404-447-0178  CIS   70271,404
P.O. Box 105203                   | UUCP uunet!hayes!tnixon  AT&T    !tnixon
Atlanta, Georgia  30348  USA      | Internet       hayes!tnixon@uunet.uu.net