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ABNF for  Referred-By  SIP Header

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RFC 3892 – Section 3

 


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

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


referrer-uri   =
( name-addr  /  addr-spec )

referredby-id-param   =
"cid"   EQUAL   sip-clean-msg-id

sip-clean-msg-id   =
LDQUOT   dot-atom   "@"   ( dot-atom  /  host )   RDQUOT

dot-atom   =
atom   *( "."   atom )

atom   =
1*( alphanum  /  "-"  /  "!"  /  "%"  /  "*"  /  "_"  /  "+"  /  " ' "  /  "`"  /  "~" )