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SIP消息
SIP-message = Request / Response
Request = Request-Line
*( message-header )
CRLF
[ message-body ]
SIP消息头域
message-header = (Accept
/ Accept-Encoding
/ Accept-Language
/ Alert-Info
/ Allow
/ Authentication-Info
/ Authorization
/ Call-ID
/ Call-Info
/ Contact
/ Content-Disposition
/ Content-Encoding
/ Content-Language
/ Content-Length
/ Content-Type
/ CSeq
/ Date
/ Error-Info
/ Expires
/ From
/ In-Reply-To
/ Max-Forwards
/ MIME-Version
/ Min-Expires
/ Organization
/ Priority
/ Proxy-Authenticate
/ Proxy-Authorization
/ Proxy-Require
/ Record-Route
/ Reply-To
/ Require
/ Retry-After
/ Route
/ Server
/ Subject
/ Supported
/ Timestamp
/ To
/ Unsupported
/ User-Agent
/ Via
/ Warning
/ WWW-Authenticate
/ extension-header) CRLF
SIP 响应状态码
Informational = "100" ; Trying
/ "180" ; Ringing
/ "181" ; Call Is Being Forwarded
/ "182" ; Queued
/ "183" ; Session Progress
Success = "200" ; OK
Redirection = "300" ; Multiple Choices
/ "301" ; Moved Permanently
/ "302" ; Moved Temporarily
/ "305" ; Use Proxy
/ "380" ; Alternative Service
Client-Error = "400" ; Bad Request
/ "401" ; Unauthorized
/ "402" ; Payment Required
/ "403" ; Forbidden
/ "404" ; Not Found
/ "405" ; Method Not Allowed
/ "406" ; Not Acceptable
/ "407" ; Proxy Authentication Required
/ "408" ; Request Timeout
/ "410" ; Gone
/ "413" ; Request Entity Too Large
/ "414" ; Request-URI Too Large
/ "415" ; Unsupported Media Type
/ "416" ; Unsupported URI Scheme
/ "420" ; Bad Extension
/ "421" ; Extension Required
/ "423" ; Interval Too Brief
/ "480" ; Temporarily not available
/ "481" ; Call Leg/Transaction Does Not Exist
/ "482" ; Loop Detected
/ "483" ; Too Many Hops
/ "484" ; Address Incomplete
/ "485" ; Ambiguous
/ "486" ; Busy Here
/ "487" ; Request Terminated
/ "488" ; Not Acceptable Here
/ "491" ; Request Pending
/ "493" ; Undecipherable
Server-Error = "500" ; Internal Server Error
/ "501" ; Not Implemented
/ "502" ; Bad Gateway
/ "503" ; Service Unavailable
/ "504" ; Server Time-out
/ "505" ; SIP Version not supported
/ "513" ; Message Too Large
Global-Failure = "600" ; Busy Everywhere
/ "603" ; Decline
/ "604" ; Does not exist anywhere
/ "606" ; Not Acceptable