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ABNF for SDP
RFC 4566and many other RFCs

Session Description   v=   o=   s=   i=   u=   e=   p=   c=   b=   t=  r=  z=   k=   a=   m=   SDP Addressing   SDP generic rules   "a=" SDP Attributes
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SDP attributes defined in

RFC 6871 – SDP Media Capabilities Negotiation

RFC 6871Section 3.3
a=rmcap   a=omcap   a=mfcap   a=mscap   a=lcfg   a=sescap

 


attribute-fields  =/
media-capability-line =
rtp-mcap =
"a=rmcap:"  media‑cap‑num‑list  1*WSPencoding‑name  "/" 
clock‑rate  [ "/"  encoding‑parms ]  CRLF
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media-cap-num-list =
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media-cap-num-element =
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media-cap-num-range =
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media-cap-num =
NonZeroDigit  *9( DIGIT )
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encoding-name =
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clock-rate =
NonZeroDigit  *9( DIGIT )
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encoding-parms =
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format-name =
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fmt-specific-param-list =
media-specific-capability =
"a=mscap:"  media‑caps‑star  1*WSP  att-field   1*WSP  att-value   CRLF
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media-caps-star =
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media-cap-star-element =
media‑cap‑num  [ wildcard ] ) /  ( media‑cap‑num‑range  [ wildcard ] )
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wildcard =
"*"
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lcfg-line =
"a=lcfg:"  config‑number  1*WSPlcfg‑cfg‑listCRLF
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lcfg-cfg-list =
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media-type =
[ "+" ]  "mt="  media
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sescap-line =
"a=sescap:" session‑num  1*WSPlist‑of‑configs  [ 1*WSPoptional‑configs ]  CRLF
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session-num =
NonZeroDigit  *9( DIGIT )
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optional-configs =
"["  list‑of‑configs  "]"
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list-of-configs =
alt‑config  *( ","  alt‑config )
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alt-config =
config‑number  *( "|"  config‑number )
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config-number =
NonZeroDigit  *9( DIGIT )
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Up
NonZeroDigit =
%x31-39
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