—Do Not Disturb
— Presence/BLF
3.Soft Keys—The screen will display labels for these keys, to identify their context-sensitive functions.
4.Line Indicators—Individual multi-color LEDs display the dynamic call state and remote user status (busy lamp field (BLF) and presence). The mapping is:
—Solid green—An active call is in progress.
—Fast flashing green—There is an Incoming (ringing) call.
—Flashing green—The call is held by the other party.
—Flashing red—The call is on hold.
—Solid red—The line is busy remotely (shared lines).
5. Line Keys | and | —Use these keys to activate up |
to lines that can be assigned to your phone.
6.Hold 
—Holds an active call or resumes a held call.
7.Headset 
—Allows you to place and receive calls through an optionally connected headset.
8.Speakerphone 
—Allows for hands-free communication during calls.
9.Hands-freeMicrophone—Picks up audio during hands-free calls. Place your phone on a hard, flat surface for best results.
10.Volume Keys 
—Use these to adjust the volume of the handset, headset, speaker, and ringer.
11.Microphone Mute 
—Mutes audio transmission locally during calls.
12.Dial Pad—These 12 keys provide the 10 digits, the alphabetic characters, and special characters available in context-sensitive applications.
13.Feature Keys—Access important features using these keys.
—Dial
—Access