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ABNF for SIP Headers

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SIP Header — Referred-By

RFC 3892Section 3

Referred-By =
( "Referred‑By" /  "b" )  HCOLONreferrer‑uri  *( SEMI  ( referredby‑id‑param /  generic‑param ) )

; example:
; Referred-By: <sip:referrer@referrer.example>
;   ;cid="abnf-20398823.2UWQFN309shb3@referrer.example"

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referrer-uri =
name‑addr /  addr‑spec )
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referredby-id-param =
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sip-clean-msg-id =
LDQUOTdot‑atom  "@"  ( dot‑atom /  host )  RDQUOT
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dot-atom =
atom  *( "."  atom )
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atom =
1*( alphanum /  "-" /  "!" /  "%" /  "*" /  "_" /  "+" /  "'" /  "`" /  "~" )
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