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ABNF for SIP Headers

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SIP Header — Subscription-State

RFC 6665Section 8.4
See also:  Event   Allow‑Events

Subscription-State =
"Subscription‑State"  HCOLONsubstate‑value  *( SEMIsubexp‑params )

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

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substate-value =
"active" /  "pending" /  "terminated" /  extension‑substate
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extension-substate =
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subexp-params =
( "reason"  EQUALevent‑reason‑value )  /
( "expires"  EQUALdelta‑seconds )  /
( "retry‑after"  EQUALdelta‑seconds )  /
max‑rate‑param /  min‑rate‑param /  amin‑rate‑param /  generic‑param
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event-reason-value =
"deactivated" /  "probation" /  "rejected" /  "timeout" /  "giveup" /  "noresource" /  "invariant" /  event‑reason‑extension
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event-reason-extension  =
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