A busy lamp field lets you monitor and answer a colleague's extension. If you speak with that person frequently, you can easily dial the number by tapping the busy lamp field line key, indicated with a blue silhouette icon. In addition, busy lamp fields can be used while transferring a call to your colleague's line and adding people to a conference call.
Line keys programmed as busy lamp fields fall below your private lines and are identified by a silhouette icon. Your phone will have one or two private lines and are identified with your extension and handset icon.
Busy lamp fields have similar, but more powerful functionality, than shared call appearances. When you answer a busy lamp field, you are pulling the call to your primary line.
To answer an incoming call from a busy lamp field: