https://tools.ietf.org/html/rfc3261
개인 정리용이므로
아래의 내용보다는 위의 출처의 글을 보는것이
더 도움이 될 수 있다.
1xx Provisional : 처리중
2xx Success : 정상
3xx Redirection : 요청을 다른 주소로 재송신
4xx Client Error : 클라이언트 장애
5xx Server Error : 서버 장애
6xx Global Failure : 사용자 연결은 가능하지만 통화불가, 모든 서버에서 사용 불가
각 코드별 상세 정보는 RFC 문서를 확인하면 됨
1xx: Provisional -- request received, continuing to process the
request;
2xx: Success -- the action was successfully received, understood,
and accepted;
3xx: Redirection -- further action needs to be taken in order to
complete the request;
4xx: Client Error -- the request contains bad syntax or cannot be
fulfilled at this server;
5xx: Server Error -- the server failed to fulfill an apparently
valid request;
6xx: Global Failure -- the request cannot be fulfilled at any
server.
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
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