SIP RFC协议标准,只可惜是 英文版的，可做参考
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SIP RFC协议标准,只可惜是 英文版的，可做参考-SIP RFC protocol standards, but unfortunately are in English, can refer to
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协议标准
RFC 2327(SDP).txt
RFC 2543(INVITE).txt
RFC 2806(TEL-URL).txt
RFC 2976(INFO).txt
RFC 3261(INVITE).txt
RFC 3262(PRACK) .txt
RFC 3265(SUBSCRIBE).txt
RFC 3311(UPDATE).txt
RFC 3326(Reason Header).txt
RFC 3428(MESSAGE).txt
RFC 3515(REFER).txt
RFC 3581(RPort).txt
RFC 3891(Replaces Header).txt
RFC 3892(Referred-By).txt
RFC 4028(Session Timers).txt
RFC 4475(Torture Test Messages).txt
