we are now using Oscar 2.0 (build from cvs sometimes ago, in july 2005) as our OSGI implementation, which is lacking an important feature for us. It is impossible right now to install bundles by reference, which means that the content of every bundle is copied to the bundle cache for every user. This is problematic in a multi-user environment.
The Felix implementation of OSGI (formerly oscar 2.0) allows reference URL for bundles. Maybe this is time to upgrade to felix?
Until we switch, the SIP Communicator will duplicate unnecessarily its bundles in a multi-user environment.