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SDP attributes defined in

RFC 6284 – Port Mapping between Unicast and Multicast RTP Sessions

RFC 6284 – Section 7.1
a=portmapping-req

 

attribute-fields  =/
portmapping‑req‑attr
portmapping-req-attr =
"a=portmapping‑req:"  port  [ SP  nettype  SP  addrtype  SP  connection‑address ]  CRLF

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