Reinhart says no.
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While not a perfect solution, you can download the entire Mumble source code here. Which means some enterprising developer (okay I'll get to it later if there's time/interest) could refactor the pertinent client code into actionscript as an add on.
Well there is a way for Ventrilo to be install on PS3.. :P but yea.. better not do it if you are not confident in it.. :D
Use Mumble/Vent/TS3 and have PS3 players use it on their phones.