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ABNF for SIP Headers

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SIP Header — Session-Expires

RFC 4028Section 4

Session-Expires =
( "Session‑Expires" /  "x" )  HCOLONdelta‑seconds  *( SEMIse‑params )

; example:
; Session‑Expires: 4000;refresher=uac

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se-params =
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refresher-param =
"refresher"  EQUAL  ( "uas" /  "uac" )
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