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ABNF Notation
ABNF for SIP Headers
(59 of 93)
SIP Header — Refer-Sub
RFC 4488
–
Section 4
Refer-Sub
=
"
Refer‑Sub
"
HCOLON
refer‑sub‑value
*(
SEMI
exten
)
refer-sub-value
=
"
true
" / "
false
"
exten
=
generic‑param