Every content item in this list is tagged with all the required labels:

• browser-plug-in
• deskphone
• extension
• incoming-call
• mailbox
• people-search
• phone
• ringtone
• voice-over-ip

To add a label to the list of required labels, choose '+ labelname' from Related Labels.
To remove a label from the required labels, choose '- labelname' from above.