IT seems that red5 suffers from a few issues in spark.
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in Spark 2.0.8 it doesnt seem to auto pop-up a red5 window on the recieving end but audio starts streaming instantly.
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No way for the recieving end to kill a conversation it seems.
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Only way to stop streaming audio is to deny Flash access to my mic webcam.
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seems like you can accidently start multiple Red5 sessions with the same person creating a weird audio echo issue and it starts to cause lag in the video.
I really like this plugin though and I think it has a lot of potential for spark.