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o=user 2890844526 2890842807 IN IP4 10.20.30.40
s=File delivery session example
i=More information
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a=source-filter: incl IN IP4 * 10.20.30.40
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a=flute-ch:1
m=application 4001 FLUTE/UDP 0
c=IN IP4 226.10.40.1/15