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The PJSIP library has a lot of advantages:
Portability . Written in native C++ , it offers good portability for different mobile and desktop platforms and operating systems. For example, there are wrappers for Windows/*nix ( Java , .NET , Python ), Android , iOS , WM7, etc.
Good documentation . There are fully described API references, articles describing all best practices and multiplatform samples.
Wide knowledge base . Due to wide usage in different projects, there is a lot of discussion on different professional expertise-sharing resources.
Powerful functionality . PJSIP contains full implementation of SIP according to the RFC specification, as well as additional features. It supports audio and video communication, message chats, conference calls, and different audio and video codecs.
Maturity . The first build of PJSIP was compiled in February 2005, and the development is still being continued by a huge community of domain professionals.