Redial button 
Redials a call. 
Keypad 
Allows you to dial phone numbers, enter letters, and choose menu items (by entering the item 
number). 
 
Speakerphone button 
 
Selects the Speakerphone as the default audio path and initiates a new call, picks up an incoming 
call, or ends a call. During a call, the button is lit green. 
The Speakerphone audio path does not change until a new default audio path is selected (for 
example, by picking up the handset). 
If a headset is connected, the Speakerphone button selects them as the default audio path. 
Video Mute button 
Mutes the video from the phone screen during a video call. When Video Mute is on, the Video Mute 
button is lit red. 
 
Mute button 
Mutes the video from the phone screen during a video call. When Video Mute is on, the Video Mute 
button is lit red. 
 
Headset button 
 
Selects the Headset as the default audio path and initiates a new call, picks up an incoming call, or 
ends a call. During a call, the button is lit green. 
A Headset icon in the phone screen header line indicates the headset is the default audio path. This 
audio path does not change until a new default audio path is selected (for example, by picking up the 
handset). 
 
Volume button 
 
Controls the handset, headset, and speakerphone volume (off hook) and the ringer Volume (on 
hook). 
Silences the ringer on the phone if an incoming call is ringing.