To achieve an Android platform of network telephone, put forward a VoIP system design scheme based on the PJSIP stack, it conforms to the Android the NDK development specification, use Java language development, the upper lower using pure C language PJSIP libraries to develop its protocol stack, and using JNI connections fluctuation two parts, is described in the PJSIP principle, and as a starting point, analysis and design of a specific VoIP system,
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