No idea yet.
I just got Openfire & Spark up and running in my organization, and will keep an eye on this thread in case anyoen else comes up with something, cause I'd like to check out this possibility as well.
DL the one for your OS
make an account with instango
once your in hit the BB menu button
add an account.. select jabber.
put your JID which will be right when u log into spark.