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ABNF for SIP:  Headers

 

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Warning   =
"Warning"   HCOLON   warning‑value   *( COMMA   warning‑value )

; example:
;  Warning: 301 isi.edu "Incompatible network address type 'E.164'"

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warning-value   =
warn-code   =
3DIGIT

; 300  Incompatible network protocol:
; One or more network protocols contained in the session description are not available

; 301  Incompatible network address formats:
; One or more network address formats contained in the session description are not available

; 302  Incompatible transport protocol:
; One or more transport protocols described in the session description are not available

; 303  Incompatible bandwidth units:
; One or more bandwidth measurement units contained in the session description were not understood

; 304  Media type not available:
; One or more media types contained in the session description are not available

; 305  Incompatible media format:
; One or more media formats contained in the session description are not available

; 306  Attribute not understood:
; One or more of the media attributes in the session description are not supported

; 307  Session description parameter not understood:
; A parameter other than those listed above was not understood

; 330  Multicast not available:
; The site where the user is located does not support multicast

; 331  Unicast not available:
; The site where the user is located does not support unicast communication (usually due to the presence of a firewall)

; 370  Insufficient bandwidth:
; The bandwidth specified in the session description or defined by the media exceeds that known to be available

; 380  SIPS Not Allowed:
; The bandwidth specified in the session description or defined by the media exceeds that known to be available [RFC 5630]

; 381  SIPS Required:
; The UAS or proxy cannot process the request because the SIPS scheme is required [RFC 5630]

; 399  Miscellaneous warning:
; The warning text can include arbitrary information to be presented to a human user or logged. A system receiving this warning MUST NOT take any automated action


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warn-agent   =
warn-text   =
pseudonym   =