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

RFC 6947 – SDP Alternate Connectivity (ALTC)

RFC 6947 – Section 4
a=altc

 

attribute  =/
altc-attr
altc-attr =
"altc"  ":"  att-value
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att-value =
altc-num  SP  addrtype  SP  connection-address  SP  port  [ "/"  rtcp-port ]
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altc-num =
1*DIGIT
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rtcp-port =
port
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