Fields displayed when hover over contact

Is there a way to make a users business phone field appear when you hover over their entry in your contacts list? Right now if I hover over a contact it shows their name, idle status, and “username@xmpp.domain” Can I change it from displaying the “username@xmpp.domain” to the business phone field from their VCard which is mapped to our active directory?

We get a lot of IM’s that are simply “what is your number?” It would be nice if users could just hover over a contact and see that persons phone number.