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ABNF for  Reason  SIP Header

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RFC 3326 – Section 2     RFC 4411 – Section 5

 


Reason   =
"Reason"   HCOLON   reason-value   *( COMMA   reason-value )

; examples:
;    Reason: SIP ;cause=200 ;text="Call completed elsewhere"
;    Reason: Q.850 ;cause=16 ;text="Terminated"
;    Reason: SIP ;cause=600 ;text="Busy Everywhere"
;    Reason: SIP ;cause=580 ;text="Precondition Failure"
;    Reason: preemption ;cause=1 ;text="UA Preemption"
;    Reason: preemption ;cause=2 ;text="Reserved Resources Preempted"
;    Reason: preemption ;cause=3 ;text="Generic Preemption"
;    Reason: preemption ;cause=4 ;text="Non-IP Preemption"


reason-value   =
protocol   =
"SIP"  /  "Q.850"  /  "Preemption"  /  token

reason-params   =
protocol-cause   =
"cause"   EQUAL   cause

cause   =
1*DIGIT

reason-text   =
"text"   EQUAL   quoted-string

reason-extension   =