I found a detailed Codeproject guide about PBX development. It might be helpful: http://www.codeproject.com/Articles/739075/How-to-build-a-simple-SIP-PBX-in-Csharp-extended-w It's based on Ozeki VoIP SIP SDK.
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I found a detailed Codeproject guide about PBX development. It might be helpful: http://www.codeproject.com/Articles/739075/How-to-build-a-simple-SIP-PBX-in-Csharp-extended-w It's based on Ozeki VoIP SIP SDK.