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1986-12-04
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IBMSIG - The Source - Updated: 4 December 1986
Call Waiting and Modems
The call-waiting feature found in many homes and offices can pose a real
problem for the person using data communication. If you are on the modem
when another call comes in, you will lose the carrier. This is particuarly
annoying if you are nearly done with a large file transfer.
The BASIC program used with this procedure is the product of many people's
work. This latest update involved changing the COM parameters so that a
device timeout would not be generated. It was also compiled with the
QuickBASIC Compiler from Microsoft and LINKed with the GWCOM.OBJ file
provided by Microsoft. It should work on any MS-DOS machine for COM1. If
you are using COM2 then you will have to use the BASIC program and change the
communication parameters on line 150 of the program from COM1 to COM2. If
you make changes and re-compile the program, don't forget to LINK it with the
GWCOM.OBJ or IBMCOM.OBJ file or it will not function properly.
This short program will set the Hayes Smartmodem or a Hayes compatible modem
so that it will not detect the incoming call. You should run this program
before making the modem call. You may get a few bad blocks or some messed up
screens but your connection will not be dropped.
If you find that your communication program resets the modem when it starts,
you will have to start your communication program first and then exit to DOS
to run CW.
Some phone systems provide the means to temporarily disable call waiting.
Check with your telephone business office for the availablility of that
capability in your area and instructions on how to use it. If it is
available, it is probably a better alternative than using this procedure.
If you are using ProComm you may be able to simply add the parameter S=200 to
your Modem initialization string to accomplish the task. It will depend on
your modem and your telephone system. This has been tried with the U.S.
Robotics, Courier 2400 modem with a GTE phone system with some success.
Please share your experiences if you find any of these methods work or you
find a better way to circumvent the problems of Call Waiting.
If you have a modem that is not Hayes compatible and you find a way to make
it work, share your experience. In addition to making your information
available to the members of the IBMSIG on The Source, a previous author
involved with this program has requested any information so that it may be
shared. He is Jeffrey Morley, SysOp of The Help Screen BBS at (703)524-3982,
24 Hours a Day, 7 Days a Week.
Questions, suggestions and comments are welcomed in the IBMSIG Post Messages
or the "IBMSIG EXCHANGE" or "IBMSIG HELP" topics in PARTI on The Source. See
you there...
Mike Todd
SysOp, IBMSIG
Source ID: SIG003