Hello All,

I need to write a VOIP or GSM client based upon SIP protocol for Windows
Mobile 2003 and 2005 .
The application should be compatible with smartphone's also.

As i am new to this field can any body give me a thread to start with VOIP
or GSM client programming on windows
Mobile.

After going through help i could find out availablity of TAPI in the SDK's .

Can i use TAPI for this
Or Microsoft supports some other library or facility for the same.

Thanks,
Ritu