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

RFC 5583 – Signaling Media Decoding Dependency

RFC 5583 – Section 5.2.2
a=depend

 

attribute-fields  =/
depend-attribute
depend-attribute =
"a=depend:"  dependent‑fmt  SP  dependency‑tag
*( ";"  SP  dependent‑fmt  SP  dependency‑tag )  CRLF
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dependency-tag =
dependency‑type  *1( SP  identification‑tag  ":"  fmt‑dependency  *( ","  fmt‑dependency ) )
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dependency-type =
"lay" /  "mdc" /  token
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dependent-fmt =
fmt
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fmt‑dependency =
fmt
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