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Generic URI
ABNF Notation
Session Description
Addressing
generic rules
"a=" SDP Attributes
SDP attributes defined in
RFC 6679 – ECN for RTP over UDP
RFC 6679
–
Section 6.1
a=
ecn-capable-rtp
attribute-fields
=/
ecn‑attribute
ecn-attribute
=
"
a=ecn‑capable‑rtp:
"
SP
init‑list
[
SP
parm‑list
]
CRLF
init-list
=
init‑value
*( "
,
"
init‑value
)
init-value
=
"
rtp
" / "
ice
" / "
leap
" /
init‑ext
init-ext
=
token
parm-list
=
parm‑value
*( "
;
"
SP
parm‑value
)
parm-value
=
mode
/
ect
/
parm‑ext
mode
=
"
mode=
" ( "
setonly
" / "
setread
" / "
readonly
" )
ect
=
"
ect=
" ( "
0
" / "
1
" / "
random
" )
parm-ext
=
parm‑name
"
=
"
parm‑value‑ext
parm-name
=
token
parm-value-ext
=
token
/
quoted‑string
quoted-string
=
(
DQUOTE
*
qdtext
DQUOTE
)
qdtext
=
%x20‑21 / %x23‑5B / %x5D‑7E /
quoted‑pair
/
UTF8-NONASCII
; No DQUOTE and no "\"
quoted-pair
=
"
\\
" / ( "
\
"
DQUOTE
)
UTF8-NONASCII
=
UTF8‑1 / UTF8‑2 / UTF8‑3 / UTF8‑4
; from
RFC 3629
–
Section 4