Vertical Communications DSU and DSU II - Manual (Page 85)

8.14 Setting A Do Not Disturb
At Your Telephone
This feature keeps calls from ringing at your telephone and makes it
appear to be busy to intercom calls. If your telephone has this feature,
you can enable it as needed.
Generally, this feature cannot be overridden by the caller. The caller
hears two quick tone bursts every three seconds when he or she calls a
telephone with this feature enabled. Some telephones, however, do have
the ability to override a do not disturb condition set at another
telephone.
NOTE: You can program a special do not disturb button if you need it
for quick access to the feature. See the programming section
of this user’s guide for details.
•
To enable do not disturb, proceed as follows:
1. Press OPTIONS.
2. Press NEXT until DND appears.
3. Press DND.
4. Press ON.
5. Press SPEAKER to end.
•
To disable the Do Not Disturb condition, repeat the above
procedure, but press OFF instead of ON.
NOTE: To override a Do Not Disturb condition at another telephone,
refer to the discussion titled Overriding Calls for details.
GCA70–245 Using The Other Telephone Features
LCD Speakerphone Reference Manual 8–13