could anyone please guide me how to make a conference call from netcf... in Windows Mobile like i have three numbers and i want to dail them for a conference call...
I've never done this myself, but you will have to use the Telephony API.
You will find in there functions like:
lineSetupConference, lineAddToConference, etc
I would recommend that you read the MSDN sections very closely as TAPI is not very easy to use.
I'm not sure how much access you have with C# and would also recommend that the coding around using these be done in C/C++ and you could expose them in a more simplified API via a DLL.