I have downloaded PortSIP SDK and compared it with another SDK called Ozeki VoIP SIP SDK (voip-sip-sdk.com). The usage and functionalities were quite similar. Both of them can be easily used. However I found that the PortSIP VoIP SDK reaches the functions via DLLImport whereas Ozeki SIP SDK is a pure .Net solution. To sum it up I would prefer the Ozeki SDK because thanks to .Net it is more flexible and I could easily implement it into my application.
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