Accessing POTS modem through framework?

Is using an analog modem simply a dead art form or is there still
functionality within the .NET Framework for accessing a modem on the
computer, sending AT commands and sending/receiving character data? At a
very minimum, I'd like to develop a small application that will dial a list
of phone numbers from a phonebook and check the modem response strings to
see if the call is answered or not.

Does anyone have any experience with this using the .NET Framework? Any
help/suggestions would be greatly appreciated.

Thanks in advance,
Patrick

Sijin
Wed Sep 08 08:51:29 CDT 2004

Well it seems that MS has put TAPI into support mode since it is now
switching over to a RTC architecture.

Here are some good links
http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&threadm=Sj1ErPU%24BHA.1916%40cpmsftngxa07&rnum=3&prev=/groups%3Fhl%3Den%26lr%3D%26ie%3DUTF-8%26q%3Dtapi%2B.net
http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&threadm=ufco3rqi30dcf5%40corp.supernews.com&rnum=7&prev=/groups%3Fhl%3Den%26lr%3D%26ie%3DUTF-8%26q%3Dtapi%2B.net
http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&threadm=OlqT4dfkEHA.1712%40TK2MSFTNGP09.phx.gbl&rnum=10&prev=/groups%3Fhl%3Den%26lr%3D%26ie%3DUTF-8%26q%3Dtapi%2B.net

And some code
http://www.gotdotnet.com/Community/UserSamples/Details.aspx?SampleGuid=5d893af6-b340-49d8-9162-b90bf6932414
http://www.sellsbrothers.com/tools/

and some components
http://www.exceletel.com/products/TeleTools/SamplePrograms/Index.htm
http://www.devdirect.com/ALL/commstelephony_PCAT_1962.aspx

Sijin Joseph
http://www.indiangeek.net
http://weblogs.asp.net/sjoseph



PMac wrote:
> Is using an analog modem simply a dead art form or is there still
> functionality within the .NET Framework for accessing a modem on the
> computer, sending AT commands and sending/receiving character data? At a
> very minimum, I'd like to develop a small application that will dial a list
> of phone numbers from a phonebook and check the modem response strings to
> see if the call is answered or not.
>
> Does anyone have any experience with this using the .NET Framework? Any
> help/suggestions would be greatly appreciated.
>
> Thanks in advance,
> Patrick
>
>

Dick
Wed Sep 08 12:03:20 CDT 2004

Hi,

>>
I'd like to develop a small application that will dial a list
of phone numbers from a phonebook and check the modem response strings to
see if the call is answered or not.
<<

There is nothing in the current framework, though there are LOTS of serial
classes and add-on (I have some in my book, below, and you can download
NETComm.ocx from my homepage) -- google will provide a number of "hits."

However, you are asking to do something that modems don't do. Thus, no
serial class or add-on will help you with part of the task. You certainly
can dial (and if answered by a modem, you can tell, because carrier detect
is raised). However, if answered by a human -- in other words, a voice
call, 99% of all modems do not provide ANY indication. Thus, that part of
the equation is not possible.

There are voice telephony boards that will do this, but not most modems.

Dick

--
Richard Grier (Microsoft Visual Basic MVP)

See www.hardandsoftware.net for contact information.

Author of Visual Basic Programmer's Guide to Serial Communications, 4th
Edition ISBN 1-890422-28-2 (391 pages) published July 2004.

Nick
Thu Sep 09 04:00:01 CDT 2004

There are some very good links on this site: http://www.lvr.com/serport.htm
including links into the Knowledge base as well as links to some
manufacturers of components.

I hope this helps,
--- Nick

"PMac" <junkmail@mcclellon.com> wrote in message
news:M5p%c.12739$QJ3.52@newssvr21.news.prodigy.com...
> Is using an analog modem simply a dead art form or is there still
> functionality within the .NET Framework for accessing a modem on the
> computer, sending AT commands and sending/receiving character data? At a
> very minimum, I'd like to develop a small application that will dial a
list
> of phone numbers from a phonebook and check the modem response strings to
> see if the call is answered or not.
>
> Does anyone have any experience with this using the .NET Framework? Any
> help/suggestions would be greatly appreciated.
>
> Thanks in advance,
> Patrick
>
>