[RCU] Global Address Book in RoundCube?

I'm the webmaster of Purple Radio, the student radio station at the University of Durham in the United Kingdom. We are currently using Bongo (www.bongo-project.org) as our backend but for the moment, are using RoundCube as our web front end until they finish the work on the web end or if we move elsewhere.

Anyway, we really need a global address book and is there such a feature in RoundCube and is it LDAP compatible? I've seen various references to a patch on the forums and mailing list but have had no luck in finding anything.

Thanks!

Seb