With ReachUC Plus it is possible to chat with other people in your organization using the ReachUC desktop or mobile app.  To start a chat conversation, simply select the other party from the PBX presence panel in the mobile app, and choose the ‘Send Message” option.  This allows you to send  a chat message using their PBX extension number as the destination.  From the WebRTC desktop app, you can choose the other party from PBX contacts that have been synced to your WebRTC app.