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SDP attributes defined in RFC 3312

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Preconditions for session establishment
curr,  des,  conf

RFC 3312 – Section 4

a=curr:   (media-level)
a=des:   (media-level)
a=conf:   (media-level)


attribute-fields   =/
current-status   =
"a=curr:"   precondition-type   SP   status-type   SP   direction-tag   CRLF

desired-status   =
"a=des:"   precondition-type   SP   strength-tag   SP   status-type   SP   direction-tag   CRLF

confirm-status   =
"a=conf:"   precondition-type   SP   status-type   SP   direction-tag   CRLF

precondition-type   =
"qos"  /     ;  Quality of Service   (see   RFC 3312)
"sec"  /     ;  Security   (see   RFC 5027 – Section 3)
"conn"  /     ;  Connectivity   (see   RFC 5898 – Section 3)
token
;  see  Registration with IANA

strength-tag   =
( "mandatory"  /  "optional"  /  "none"  /  "failure"  /  "unknown" )

status-type   =
( "e2e"  /  "local"  /  "remote" )

direction-tag   =
( "none"  /  "send"  /  "recv"  /  "sendrecv" )