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ABNF Notation
ABNF for SIP Headers
(80 of 93)
SIP Header — Subject
Section 20.36 of RFC 3261
and
ABNF in RFC 3261
Subject
=
( "
Subject
" / "
s
" )
HCOLON
[
TEXT‑UTF8‑TRIM
]
; example:
;
Subject: A tornado is heading our way!