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ABNF for SIP:  Headers

 

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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"

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reason-value   =
protocol   *( SEMI   reason‑params )
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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   =
protocol-cause   =
"cause"   EQUAL   cause
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cause   =
1*DIGIT
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reason-text   =
"text"   EQUAL   quoted‑string
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reason-extension   =