The new app PLUCS in the Univention App Center provides you with a
Jabber/XMPP daemon for instant messaging with domain integration via
PLUCS provides an integration between the Jabber server, the directory and the UCS management system. As soon as it is installed, further XMPP domains, which are directly activated at the user, can be optionally configured on the server. In addition, existing groups can be converted into XMPP groups, which will then appear in the contact list of the Jabber client.
An overview of all available apps can be found in the app catalogue at: https://www.univention.de/en/products/ucs/app-catalogue/