pjsip:sip协议栈源码，可在Linux和windows下编译生成库文件。进行应用开发。-pjsip: sip protocol stack source code can be compiled under Linux and windows to generate a library file. Application development.

IPHER API Reference.pdf Descr iption of the Installation and Upgrade of the Hi3521a???Hi3520dv300 SDK.txt Differences Between the MPIs of the Hi3521A???Hi3520DV300 and the Hi3521.pdf Differences Between the SDKs of the Hi3521A and Hi3520D V300.pdf