Teleco UST DK User Manual page 12

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If you have an LCD telephone, you can determine the actual Directory
Number of a [DN] button by pressing the [DN] you want to display
and dialing
Table 2 Directory Button Definitions
Button
[PDN]
Primary Directory
Number
[SDN]
Secondary Directory
Number
[PhDN]
Phantom Directory
Number
12
. The number ( ) displays.
Press to answer a call to the Primary Directory Number or to initiate a
phone call. The [PDN] is specifically your Extension Number or Intercom
Number. Your telephone can have up to four [PDN] buttons with your
number. You can set Call Forward and Voice Mail ID code for your [PDN].
A [PDN] of another telephone which appears on your telephone is
considered a [SDN]. You cannot set Call Forward and Voice Mail ID code
for [SDNs] on your telephone.
Up to eight Phantom Directory Numbers can be dedicated to a station or
shared by a group of stations. One example of a Phantom Directory
Number application is when it is used as a common phone number for an
entire department. For instance, when the [PhDN] appears on a group of
telephones, such as the Sales Department, it will ring on all of the
telephones of the group when it is called. You can only set Call Forward
and Voice Mail ID code for [PhDNs] that are owned by your telephone. You
can have a separate message waiting button and mailbox for up to four
[PhDNs] on your telephone.
Definitions
UST DK Digital Telephone
DN = 210