国内的 C++ 并发编程的教程并不稀少，不管是书籍、博客、视频。然而大多数是粗糙的、不够准确、复杂的 ...
SIP (Session Initiation Protocol) is the IETF (Internet Engineering Task Force) signaling standard for managing multimedia session initiation defined in RFC 3261 commonly used in VOIP communication.
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