Polycom VVX 1500 C Business Media Phone for Cisco Unified Communications Manager (SIP) - Manual (Page 145)

Using the Basic Features of Your Phone
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To enable Do Not Disturb for a particular line:
1. Press .
The Line Select screen displays.
Note You can automatically enable or disable Do Not Disturb for all lines. To
automatically enable Do Not Disturb for all lines, tap the Set All soft key. To
automatically disable the feature for all lines, tap the Clear All soft key. After you
tap the Set All or Clear All soft key, the idle screen displays.