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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 3312 – Preconditions for session establishment

RFC 3312Section 4
a=curr   a=des   a=conf

 


attribute-fields  =/

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precondition-type =
"qos" /  ; Quality of Service  RFC 3312Section 4
"sec" /  ; Security  RFC 5027Section 3
"conn" /  ; Connectivity  RFC 5898Section 3
token
; see  IANA
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strength-tag =
( "mandatory"  /  "optional" /  "none" /  "failure" /  "unknown" )
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status-type =
( "e2e"  /  "local" /  "remote" )
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direction-tag =
( "none"  /  "send" /  "recv" /  "sendrecv" )
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