Check the Ozeki VoIP SIP SDK sample source code for creating a softphone at: http://www.voip-sip-sdk.com/p_122-source-code-explanation-for-a-c-open-source-voip-softphone-with-wpf-gui-using-ozeki-sip-sdk-voip.html
You probably need to check your audio controls in your computer's
control panel to make your headset the default audio device and also
make sure your softphone control panel is set the same way.
Good luck from Headsets Direct!
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