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Session Description  Addressing  generic rules  "a=" SDP Attributes
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SDP attributes defined in

RFC 4566 – SDP

RFC 4566 – Section 6
a=cat   a=keywds   a=tool   a=ptime   a=maxptime   a=rtpmap   a=recvonly   a=sendrecv   a=sendonly   a=inactive   a=orient   a=type   a=charset   a=sdplang   a=lang   a=framerate   a=quality   a=fmtp

Note:  no ABNF definitions for theses attributes

;  a=cat:<category>
;  see  Here  in RFC 4566
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;  a=keywds:<keywords>
;  see  Here  in RFC 4566
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;  a=tool:<name and version of tool>
;  see  Here  in RFC 4566
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;  a=ptime:<packet time>
;  see  Here  in RFC 4566
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;  a=maxptime:<maximum packet time>
;  see  Here  in RFC 4566
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;  a=rtpmap:<payload type> <encoding name> / <clock rate> [/ <encoding parameters>]
;  see  Here  in RFC 4566
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;  a=recvonly
;  see  Here  in RFC 4566
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;  a=sendrecv
;  see  Here  in RFC 4566
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;  a=sendonly
;  see  Here  in RFC 4566
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;  a=inactive
;  see  Here  in RFC 4566
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;  a=orient:<orientation>
;  see  Here  in RFC 4566
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;  a=type:<conference type>
;  see  Here  in RFC 4566
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;  a=charset:<character set>
;  see  Here  in RFC 4566
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;  a=sdplang:<language tag>
;  see  Here  in RFC 4566
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;  a=lang:<language tag>
;  see  Here  in RFC 4566
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;  a=framerate:<frame rate>
;  see  Here  in RFC 4566
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;  a=quality:<quality>
;  see  Here  in RFC 4566
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;  a=fmtp:<format> <format specific parameters>
;  see  Here  in RFC 4566
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