Zoom ADSL X6v 5697 - Manual (Page 46)

Do Not Disturb
Note: This feature applies to VoIP calls only.
On the User Configuration menu, click Do Not Disturb to
enable or disable this feature, which allows you to block all calls
except those from the phone numbers on the Do Not Disturb
Exceptions list:
Your phone will not ring unless you get a call from one of the
phone numbers that you enter on the Exceptions list.
Call Waiting/Caller ID
This feature applies to VoIP calls only.
On the User Configuration menu, click Call Waiting/Caller ID
to configure Call Waiting, Inbound and Outbound Caller ID, and
Call Waiting Caller ID:
ADSL X6v User Guide 46