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Source Flows A UDP-based packet flow is uniquely identified Source/Destination IP Addresses Source/Destination Ports ? An integer identifier MAY be used internally within the FEC scheme as a shorthand fec-source-flow-line = "a=fec-source-flow:" source-id [";" SP tag-length] CRLF source-id = "id=" src-id src-id = 1*DIGIT (MANDATORY) tag-length = "tag-len=" tlen tlen = *DIGIT (OPTIONAL) |