Make Call using Tapi 3 driver

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C#3.0

C#

Hi All,

i am developing C# window application using TAPI 3 driver, while developing i gone through several site that is giving hint and partcularly gone through "http://www.codeproject.com/Articles/10994/TAPI-3-0-Application-development-using-C-NET" and "http://www.codeproject.com/Articles/17048/Examples-to-create-your-Conferencing-System-in-NET" and by using that i have created a window application.

My problem is i have a client Window XP machine. i have installed TAPI 3 driver and able to successfully registered the "IP Office Phone: 4322" from code and also i got the regsitration code.
But while making call i got status "Dialing" and "connected" but number is not getting called and after some time it automatically get disconnected.

Can anybidy help me to solve this issue.

Note : I am using TAPI3