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there is the gaim-vv project there :
and as stated on their news list :
July 19, 2004 - The next release will be based on gstreamer, unless something breaks horribly and we feel compelled to put up a release in the mean time.
there is also the http://www.phonegaim.com/ project, one more gaim based one, but no plan for gstreamer back-end here
and no plan for a gstreamer back-end in gnomemeeting that i am aware of