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From: mike@point.UUCP (Mike Andrews)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Modems and call waiting
Keywords: modem call waiting
Message-ID: <[1342.8]comp.ibmpc;1@point.UUCP>
Date: 16 Aug 89 05:00:08 GMT
References: <44d4af00.15768@gtephx.UUCP> <2571@astroatc.UUCP>
Lines: 9

Setting the S10 register to a higher value will work, but only if BOTH
modems are set to higher value. S10 is the time in tenths of a second that
the modem will wait to recognize a loss of carrier. You can set the register
as high as 255, i.e. ATS10=255, but both you and the modem calling you must
do that.  That would mean that the phone line could disappear for 25 1/2
seconds before the modems would give up with a NO CARRIER result. Note that
while the modems are connected they normally will not resond to dialing
commands, although this may vary by manufacturer, so you may not be able to
tell your modem to do the "flash-*70" on the fly while connected.