1.7 Primary Directory Number (PDN)/Secondary Directory Number (SDN) Features
Feature Guide 121
6) A Call From 333-3333 Arrives at Ext. 102
7) The Call From 333-3333 is Answered by Ext. 103
8) The Call From 333-3333 is Transferred by Ext. 103 to Extension 102
Conditions
[General]
• A flexible button of a PT and a PS can be customised as a PDN or SDN button. A flexible button on a
DSS Console can be customised as an SDN button.
• An extension can have up to eight PDN buttons.
• If none of an extension's PDN buttons are idle, the extension will not receive incoming calls, including
Call Waiting. Therefore, it is strongly recommended for PDN extensions to have at least three PDN
buttons.
• Through COS programming, it is possible to select whether extensions can create SDN buttons on their
own extensions using PT programming.
• Up to eight different extensions can assign SDN buttons corresponding to the same PDN extension.
• When a PDN extension has an idle CO button or ICD Group button, calls will arrive on the following
buttons according to the following priority:
– Incoming intercom calls to an ICD group: ICD Group button → PDN button
– Incoming trunk calls: S-CO button → G-CO button → L-CO button → PDN button
– Incoming trunk calls to an ICD group: ICD Group button → S-CO button → G-CO button → L-CO
button → PDN button
• When multiple calls of the same status (e.g., on hold) are on a PDN extension, the status of the newest
call will be displayed on the corresponding SDN extensions. For example, if a PDN extension has two
calls ringing, an SDN extension will answer the call that arrived at the PDN extension last, when
pressing the SDN button.
(Rapid Red
Flashing)
SDN buttons
(Off)
(Extn. 103)
(Rapid Red
Flashing)
(Extn. 102)
Extn. 101 (Boss)
SDN buttons
(Off)
(Extn. 103)
(Extn. 101)
Extn. 102 (Boss) Extn. 103 (Secretary)
PDN buttons
(Off)
(Off)
(Off)
PDN buttons
(Off)
(Green On)
(Rapid Green
Flashing)
PDN buttons
(Off)
(Off)
(Rapid Green
Flashing)
SDN buttons
(Rapid Red
Flashing)
(Extn. 102)
(Rapid Red
Flashing)
(Extn. 101)
(Rapid Red
Flashing)
SDN buttons
(Off)
(Extn. 103)
(Red On)
(Extn. 102)
Extn. 101 (Boss)
SDN buttons
(Off)
(Extn. 103)
(Extn. 101)
Extn. 102 (Boss)
PDN buttons
(Off)
(Off)
(Red On)
Extn. 103 (Secretary)
PDN buttons
(Off)
(Off)
(Off)
PDN buttons
(Off)
(Green On)
(Rapid Green
Flashing)
SDN buttons
(Green On)
(Extn. 102)
(Rapid Red
Flashing)
(Extn. 101)
SDN buttons
(Off)
(Extn. 103)
(Red On)
(Extn. 102)
Extn. 101 (Boss) Extn. 102 (Boss) Extn. 103 (Secretary)
PDN buttons
(Off)
(Off)
(Off)
PDN buttons
(Off)
(Green On)
(Rapid Green
Flashing)
(Rapid Red
Flashing)
SDN buttons
(Off)
(Extn. 103)
(Extn. 101)
PDN buttons
(Off)
(Off)
(Rapid Green
Flashing)
SDN buttons
(Moderate
Green Flashing)
(Extn. 102)
(Rapid Red
Flashing)
(Extn. 101)
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