If you have a mobile device, you also are able to install the Jabber client from your device’s app store. However, calling from the mobile app currently is not configured. It is a separate configuration from the PC based Jabber client that still needs to be completed.
The most important thing to note for Jabber is the phone control feature (bottom left of the hub window), which allows you to control your desk phone from your computer. If you want all calls to to skip your phone and go directly to your computer, make sure that it is set to “Use my computer for calls” and that you have a microphone or headset available, just as you would for a Skype call. Jabber also is able to make video calls to a desk phone.