Re: problem with ITCallInfo.CallState when dialing to a phone.

From: Andreas Marschall [MVP TAPI] (Andreas.Marschall_at_I-B-A-M.de)
Date: 01/26/05 

Date: Wed, 26 Jan 2005 15:49:08 +0100

"Nadav" <NadavPopplewell@newsgroup.nospam> schrieb im Newsbeitrag
news:EF4E35D7-3C90-4EBD-BCF1-3CAEDE7B57AC@microsoft.com...
> I've started to learn TAPI and I'm trying to dial to a phone
> (eventually I wan't to send a voice message to a phone, but right now I
> can't even dial properly).
> I'm using C# & visual studio 2003,and I imported the TAPI3 com object
> (TAPI3Lib) into my project.
>
> What happens is that the program DOES dial the phone.
> However, there is something strange with the CallState property of the call
> object.
> When I call the phone I get event with:
> e.State=CS_INPROGRESS
> (and the phone start ringing)
> And then, BEFORE I pick up the phone I get another event with:
> e.State=CS_CONNECTED
> When I answer the phone and put down the handset, I don't get any event
> and the call CallState stays CS_CONNECTED.
> What I'm I doing wrong?

Nadav,
I presume you are using a voice modem with UniModem.TSP?

There is a limitation for voice modems: their hardware doesn't have proper
call progression detection capabilities in vocie mode, i.e. they simply don't
detect when the outgoing call has been answered, so UniModem.TSP is generating
a _CONNECTED blindly after the dialling is complete. 

-- 
Best Regards
Andreas Marschall
Microsoft MVP for TAPI / Windows SDK
TAPI / TSP Developer and Tester
http://www.I-B-A-M.de/Andreas_Marschall's_TAPI_and_TSPI_FAQ.htm
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