4.2. User 
The second tab on your main navigation bar, is the User tab. From here you
can view your account’s information, sign in/out, modify your account’s details
and administer your voice mail.
INFO:
The Presence and Devices
sections in the Voice-Only configuration are grayed out, and are only
configurable in the Integrated and UC-Only modes.
For more information about the User tab please refer to the subchapter in
the chapter Using Integrated or UC-only Configurations.
‣ Parent topic: Section 4. Using Voice-Only Configuration