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ABNF for SDP – Session Description Protocol

|   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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a=rmcap:   (session- or media-level)
a=omcap:   (session- or media-level)
a=mfcap:   (session- or media-level)
a=mscap:   (session- or media-level)
a=lcfg:   (media-level)
a=sescap:   (session-level)


attribute-fields   =/
media-capability-line   =
rtp-mcap   =
"a=rmcap:"   media-cap-num-list   1*WSP   encoding-name   "/"  
clock-rate   [ "/"   encoding-parms ]   CRLF

non-rtp-mcap   =
"a=omcap:"   media-cap-num-list   1*WSP   format-name   CRLF

media-cap-num-list   =
media-cap-num-element   =
media-cap-num-range   =
media-cap-num   =
NonZeroDigit   *9( DIGIT )

encoding-name   =
clock-rate   =
NonZeroDigit   *9( DIGIT )

encoding-parms   =
format-name   =
NonZeroDigit   =
%x31-39

media-format-parameter-capability   =
"a=mfcap:"   media-cap-num-list   1*WSP   fmt-specific-param-list   CRLF

fmt-specific-param-list   =
media-specific-capability   =
"a=mscap:"   media-caps-star   1*WSP   att-field   1*WSP   att-value   CRLF

media-caps-star   =
media-cap-star-element   =
media-cap-num   [ wildcard ] )  /  ( media-cap-num-range   [ wildcard ] )

wildcard   =
"*"

lcfg-line   =
"a=lcfg:"   config-number   1*WSP   lcfg-cfg-list   CRLF

config-number   =
NonZeroDigit   *9( DIGIT )

lcfg-cfg-list   =
media-type   =
[ "+" ]   "mt="   media

sescap-line   =
"a=sescap:" session-num   1*WSP   list-of-configs   [ 1*WSP   optional-configs ]   CRLF

session-num   =
NonZeroDigit   *9( DIGIT )

list-of-configs   =
alt-config   *( ","   alt-config )

optional-configs   =
"["   list-of-configs   "]"

alt-config   =
config-number   *( "|"   config-number )

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