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ABNF for SIP Headers

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SIP Header — Retry-After

Section 20.33 of RFC 3261  and  ABNF in RFC 3261

Retry-After =
"Retry-After"  HCOLONdelta‑seconds  [ comment ]  *( SEMIretry‑param )

; examples:
;  Retry‑After: 18000;duration=3600
;  Retry‑After: 120 (I'm in a meeting)

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retry-param =
( "duration"  EQUALdelta‑seconds ) /  generic‑param
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