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

RFC 4145 – TCP-Based Media Transport in SDP

RFC 4145 – Section 4 – Section 5
a=setup   a=connection

 

attribute-fields  =/
setup-attr /  connection-attr
setup-attr =
"a=setup:"  role  CRLF
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role =
"active" /  "passive" /  "actpass" /  "holdconn"
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connection-attr =
"a=connection:"  conn-value  CRLF
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conn-value =
"new" /  "existing"
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