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The ROLM DND feature enables a station to be put in to a Do Not Disturb state.  In this state all incoming calls to that station follow the call forwarding defined for Do Not Disturb and do not ring on that telephone. Calls from that station are still permitted.   Note that many companies do not allow this feature be enabled ... as purposefully blocking or avoiding calls is against company policy.

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To initiate this call blocking feature simply...
Get dial tone ...
Pickup...
Press ...DND... <or> dial ...# 5...
Hangup ...Hangup.
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To cancel this call blocking feature simply ....

Get dial tone ...Pickup...
Press ...DND... <or> dial ...# # 5.
Hangup ...Hangup.
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Phone User Guide   |   Siemens Rolm Phone User Guide