Download Cisco Jabber from the app store.
You must be connected to the wcs-secure wireless network.
When you launch the app, it will ask for your e-mail address to determine how to locate the servers. Enter it as login@jabber.wcs.k12.va.us.
Whenever it asks for your login/password on the next screens, use your e-mail login (just the user part) and the default password is lastname+employeeID.
You will get prompted several times to accept the server certificates, accept them all.
After logging in, if you click on the menu, you should see check marks beside Instant Messaging, Phone Services, and Voicemail. That means those services are all active.
The voicemail service may not connect right the first time. Click on it in the menu and re-enter your login and password. Server address should be 192.168.102.13.