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ABNF for SIP:  Headers

 

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Retry-After   =
"Retry-After"   HCOLON   delta‑seconds   [ comment ]   *( SEMI   retry‑param )

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

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