As an afterthought:
This may also have legal implications. Offering a voice server (or an irc gateway) may make you (or us, or the Wikimedia e.V.!) an "service provider" in the sense of German Law (which applies since the toolserver is run by the German Wikimedia e.V.) This would imply some liability wrt content, and it might also mean that we have to offer a surveillance interface (seriously!). I'm not sure about the detailed conditions and implications, but it would probably be a good idea to ask the e.V. about it, or rather to ask them to seek legal advise on the matter. Which make take a while.
-- Daniel
PS: it would actually be interesting to know in how far all this already applies because we are running a web hosting (!) service.