介绍sip的一个文档，比较不错
sip protocol 2361 Protocol Independent Multicast-Sparse Mode (PIM-SM): Protocol Specification
SIP 协议，草案稿
SIP是一个用来为Python生成C++接口代码的土工具。
UnderstandingtheSIPdocument.
OneofthefeaturesofPythonthatmakesitsopowerfulistheabilitytotakeexistinglibraries,writteninCorC++,and
TherearemanyapplicationsoftheInternetthatrequirethecreationandmanagementofasession,whereasessionisco
sip学习自己还不错
JAVA的SIP电话
ThetutorialgiveyouanoverviewonSIPprotocol
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