You can stop an incoming call from ringing on your handset or set the handset to not ring for any incoming call.
Silence an Incoming Call
If you don't want to answer a call, you can silence the handset to stop the ringing. The call will transfer to your voicemail, if voicemail is configured.
When a call is ringing,
Set Do Not Disturb
You can set the handset to not disturb you when you get an incoming calls. This is called do not disturb (DND) mode. When you are in this mode, you see the DND icon in the screen headers. If you get a call while DND is active, the call is sent to voicemail.
While in DND, many of the icons that display on the header are different from normal.
To use this feature, your administrator must enable DND.
Press Menu .
Highlight your choice.
Press Select to save the setting.