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Session Description  Addressing  generic rules  "a=" SDP Attributes
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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
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init-list =
init‑value  *( ","  init‑value )
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init-value =
"rtp" /  "ice" /  "leap" /  init‑ext
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init-ext =
token
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parm-list =
parm‑value  *( ";"  SP  parm‑value )
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parm-value =
mode /  ect /  parm‑ext
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mode =
"mode="  ( "setonly" /  "setread" /  "readonly" )
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ect =
"ect="  ( "0" /  "1" /  "random" )
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parm-ext =
parm‑name  "="  parm‑value‑ext
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parm-name =
token
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parm-value-ext =
token /  quoted‑string
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quoted-string =
( DQUOTE  *qdtext  DQUOTE )
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qdtext =
%x20‑21 /  %x23‑5B /  %x5D‑7E /  quoted‑pair /  UTF8-NONASCII
; No DQUOTE and no "\"
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quoted-pair =
"\\" /  ( "\"  DQUOTE )
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UTF8-NONASCII =
UTF8‑1 /  UTF8‑2 /  UTF8‑3 /  UTF8‑4
;  from   RFC 3629 – Section 4
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