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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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SDP attributes defined in
RFC 5576 – Source-Specific Media Attributes

RFC 5576Section 4Section 10  —  see also:  IANA

|   a=ssrc   |   a=ssrc‑group   |   a=cname   |   a=previous‑ssrc   |

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attribute   =/
ssrc-attr   =
"ssrc:"   ssrc-id   SP   attribute
;   see  Section 4.1  and  Figure 4 of RFC 5576
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ssrc-group-attr   =
"ssrc-group:"   semantics   *( SP   ssrc‑id )
;   see  Section 4.2  and  Figure 5 of RFC 5576
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semantics   =
"FEC"  /     ;  see   RFC 5576
"FID"  /     ;  see   RFC 5576
"FEC-FR"  /     ;  see   RFC 5956Section 4.3
"DUP"  /     ;  see   RFC 7104Section 3.2
token
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cname-attr   =
"cname:"   cname
;   see  Section 6.1  and  Figure 6 of RFC 5576
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previous-ssrc-attr   =
"previous‑ssrc:"   ssrc‑id   *( SP   ssrc‑id )
;   see  Section 6.2  and  Figure 7 of RFC 5576
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cname   =
byte-string
;  following the syntax conventions for CNAME as defined in   RFC 3550Section 6.5.1
;  with guidelines in   RFC 7022

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ssrc-id   =

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