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ABNF for  From  SIP Header

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RFC 3261 – Section 20.20

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From   =
( "From"  /  "f" )   HCOLON   from-spec

; examples:
;    From: Alice <sip:alice@atlanta.example.com>;tag=9fxced76sl
;    From: "Anonymous" <sip:anonymous@anonymous.invalid>;tag=1928301774


from-spec   =
( name-addr  /  addr-spec )   *( SEMI   from-param )

from-param   =
tag-param   =
"tag"   EQUAL   token