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You can also use it for instant messaging and desk to desk video calls. Please see the University Information Services Jabber Guide for more information about installing and using the different features. The University of Stanford has some good documentation that might also be of use https://uit.stanford.edu/service/jabber/quick-guides
Please note that Cisco Jabber requires its own password. This can be set in My.Phone Phone Options. If you do not see a “Cisco Password” section on that page, you have not been enabled for Jabber and you should contact your Telephone Liaison Officer to arrange for this to be setup.