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ABNF for  Subscription-State  SIP Header

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RFC 6665 – Section 8.4

See also:     Event     Allow-Events


Subscription-State   =
"Subscription-State"   HCOLON   substate-value   *( SEMI   subexp-params )

; example:
;    Subscription-State: active;expires=60


substate-value   =
"active"  /  "pending"  /  "terminated"  /  extension-substate

extension-substate   =
subexp-params   =
( "reason"   EQUAL   event-reason-value )  /
( "expires"   EQUAL   delta-seconds )  /
( "retry-after"   EQUAL   delta-seconds )  /
max-rate-param  /  min-rate-param  /  amin-rate-param  /     ; RFC 6446 – Section 9.2
generic-param

event-reason-value   =
"deactivated"  /  "probation"  /  "rejected"  /  "timeout"  /
"giveup"  /  "noresource"  /  "invariant"  /
event-reason-extension

event-reason-extension    =