VoIP SIP SDK, developing a softphone

To build a softphone I have found an SDK (Ozeki VoIP SIP SDK) on the net. Would you be so kind to help me with giving the most important aspects I should concentrate on? The page where you can find more information: http://voip-sip-sdk.com/p_95-registe-sip-pbx-voip.html
Thanks.

What information and help do you exactly want ??? Just inform me about it..

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