I tried an SDK (Ozeki VoIP SIP SDK) but got stucked when I tried to build my soft phone. They say it is compatible with Visual Studio 2010 which I have but i am not sure about it. Could anyone help me. The page where you can find more information: http://voip-sip-sdk.com/p_358-advanced-softphone-development-voip.html
Thanks.
Thanks.