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ABNF for SIP
RFC 3261and subsequent RFCs

SIP Response Codes

Section 21 of RFC 3261  and  ABNF in RFC 3261  —  IANA

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Informational =
"100" /   ; Trying   RFC 3261 – Section 21.1.1
"180" /   ; Ringing   RFC 3261 – Section 21.1.2
"181" /   ; Call Is Being Forwarded   RFC 3261 – Section 21.1.3
"182" /   ; Queued   RFC 3261 – Section 21.1.4
"183" /   ; Session Progress   RFC 3261 – Section 21.1.5
"199"  ; Early Dialog Terminated   RFC 6228Section 11.1

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Success =
"200" /   ; OK   RFC 3261 – Section 21.2.1
"202" /   ; Accepted (Deprecated)   RFC 6665Section 8.3.1
"204"  ; No Notification   RFC 5839Section 8.1

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Redirection =
"300" /   ; Multiple Choices   RFC 3261 – Section 21.3.1
"301" /   ; Moved Permanently   RFC 3261 – Section 21.3.2
"302" /   ; Moved Temporarily   RFC 3261 – Section 21.3.3
"305" /   ; Use Proxy   RFC 3261 – Section 21.3.4
"380"  ; Alternative Service   RFC 3261 – Section 21.3.5

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Client-Error =
"400" /   ; Bad Request   RFC 3261 – Section 21.4.1
"401" /   ; Unauthorized   RFC 3261 – Section 21.4.2
"402" /   ; Payment Required   RFC 3261 – Section 21.4.3
"403" /   ; Forbidden   RFC 3261 – Section 21.4.4
"404" /   ; Not Found   RFC 3261 – Section 21.4.5
"405" /   ; Method Not Allowed   RFC 3261 – Section 21.4.6
"406" /   ; Not Acceptable   RFC 3261 – Section 21.4.7
"407" /   ; Proxy Authentication Required   RFC 3261 – Section 21.4.8
"408" /   ; Request Timeout   RFC 3261 – Section 21.4.9
"410" /   ; Gone   RFC 3261 – Section 21.4.10
"412" /   ; Conditional Request Failed   RFC 3903Section 13.2
"413" /   ; Request Entity Too Large   RFC 3261 – Section 21.4.11
"414" /   ; Request-URI Too Long   RFC 3261 – Section 21.4.12
"415" /   ; Unsupported Media Type   RFC 3261 – Section 21.4.13
"416" /   ; Unsupported URI Scheme   RFC 3261 – Section 21.4.14
"417" /   ; Unknown Resource-Priority   RFC 4412Section 12.4
"420" /   ; Bad Extension   RFC 3261 – Section 21.4.15
"421" /   ; Extension Required   RFC 3261 – Section 21.4.16
"422" /   ; Session Interval Too Small   RFC 4028Section 12.2
"423" /   ; Interval Too Brief   RFC 3261 – Section 21.4.17
"424" /   ; Bad Location Information   RFC 6442Section 8.4
"428" /   ; Use Identity Header   RFC 4474Section 14.2
"429" /   ; Provide Referrer Identity   RFC 3892Section 8
"430" /   ; Flow Failed   RFC 5626Section 11.5
"433" /   ; Anonymity Disallowed   RFC 5079Section 6
"436" /   ; Bad Identity Info   RFC 8224Section 13.2
"437" /   ; Unsupported Credential   RFC 8224Section 13.2
"438" /   ; Invalid Identity Header   RFC 4474Section 14.5Section 14.2
"439" /   ; First Hop Lacks Outbound Support   RFC 5626Section 11.6
"440" /   ; Max-Breadth Exceeded   RFC 5393Section 6.2
"469" /   ; Bad Info Package   RFC 6086Section 11.6
"470" /   ; Consent Needed   RFC 5360Section 6.1
"480" /   ; Temporarily Unavailable   RFC 3261 – Section 21.4.18
"481" /   ; Call/Transaction Does Not Exist   RFC 3261 – Section 21.4.19
"482" /   ; Loop Detected   RFC 3261 – Section 21.4.20
"483" /   ; Too Many Hops   RFC 3261 – Section 21.4.21
"484" /   ; Address Incomplete   RFC 3261 – Section 21.4.22
"485" /   ; Ambiguous   RFC 3261 – Section 21.4.23
"486" /   ; Busy Here   RFC 3261 – Section 21.4.24
"487" /   ; Request Terminated   RFC 3261 – Section 21.4.25
"488" /   ; Not Acceptable Here   RFC 3261 – Section 21.4.26
"489" /   ; Bad Event   RFC 6665Section 8.3.2
"491" /   ; Request Pending   RFC 3261 – Section 21.4.27
"493" /   ; Undecipherable   RFC 3261 – Section 21.4.28
"494"  ; Security Agreement Required   RFC 3329Section 6.4

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Server-Error =
"500" /   ; Server Internal Error   RFC 3261 – Section 21.5.1
"501" /   ; Not Implemented   RFC 3261 – Section 21.5.2
"502" /   ; Bad Gateway   RFC 3261 – Section 21.5.3
"503" /   ; Service Unavailable   RFC 3261 – Section 21.5.4
"504" /   ; Server Time-out   RFC 3261 – Section 21.5.5
"505" /   ; Version Not Supported   RFC 3261 – Section 21.5.6
"513" /   ; Message Too Large   RFC 3261 – Section 21.5.7
"580"  ; Precondition Failure   RFC 3312Section 8

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Global-Failure =
"600" /   ; Busy Everywhere   RFC 3261 – Section 21.6.1
"603" /   ; Decline   RFC 3261 – Section 21.6.2
"604" /   ; Does Not Exist Anywhere   RFC 3261 – Section 21.6.3
"606"  ; Not Acceptable   RFC 3261 – Section 21.6.4
"607"  ; Unwanted   RFC 8197 – Section 5

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