How to Create a Jabber Server
Collaboration via a server is more scalable, but requires special Sugar support in the server.
A server can be set up using the XS school server for school deployments.
Running your own server
Two different Jabber server programs are known to work with Sugar; prosody and ejabberd.
As used by the Sugar Labs Jabber server.
See Installing ejabberd for instructions on installing and configuring.
More details on the ejabberd configuration are here: Ejabberd Configuration