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ABNF for SIP Headers

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SIP Header — Reason

RFC 3326Section 2

Reason =
"Reason"  HCOLONreason‑value  *( COMMAreason‑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"

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reason-value =
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protocol =
"SIP" /  "Q.850" / 
"Preemption" /  ; see  RFC 4411Section 5
; the following in  3GPP TS 24.229Clause 7.2A.18
"EMM" /  ; see  3GPP TS 24.301subclause 9.9.3.9
"ESM" /  ; see  3GPP TS 24.301subclause 9.9.4.4
"S1AP-RNL" /  ; (radio network layer) see  3GPP TS 36.413
"S1AP-TL" /  ; (transport layer) see  3GPP TS 36.413
"S1AP-NAS" /  ; (non-access stratum) see  3GPP TS 36.413
"S1AP-MISC" /  ; miscellaneous) see  3GPP TS 36.413
"S1AP-PROT" /  ; (protocol) see  3GPP TS 36.413
"DIAMETER" /  ; see  3GPP TS 29.274subclause 8.103
"IKEV2" /  ; see  3GPP TS 29.274subclause 8.103
"RELEASE_CAUSE" / 
; 1  User ends call
; 2  RTP/RTCP time-out
; 3  Media bearer loss
; 4  SIP timeout - no ACK
; 5  SIP response time-out
; 6  Call-setup time-out
 
"FAILURE_CAUSE" / 
; 1  Media bearer or QoS lost
; 2  Release of signalling bearer
; 3  Indication of failed resources allocation
 
token
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reason-params =
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protocol-cause =
"cause"  EQUALcause
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cause =
1*DIGIT
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reason-text =
"text"  EQUALquoted‑string
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reason-extension =
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