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154 ICX (International) issued October 2000 ICX-50-700
Chapter 5. Key Telephone Features Section 700 - Operation
In Version 4.0 and higher, directory numbers may be assigned to stations that are not installed,
provided the cabinet is installed. However, once the directory numbers have been assigned to a
particular slot, that slot is no longer available.
Figure 3. Example Directory Number assignments for Extension 200
When a caller originates a call, the call appears on the first available PDN key. If all PDNs are
unavailable, the call will select the INT LED.
When calls come in to a DN, the call appears on the first available DN key. If the call is to your PDN
and no PDN key is available, the call appears on the INT LED.
Directory numbers may be assigned to FF keys 25-32. These are non-appearing keys.
Intercom voice calls only go to the PDN extension but light the corresponding NPDN keys red. A tone
call follows the appropriate ring status (immediate ring, delayed ring, etc.) for any extension.
To originate a call using a Primary Directory Number:
Action Result
1. Lift the handset or press the ON/OFF key. Intercom dial tone
The first available PDN key lights.
2. If dialling an outside call, dial the outside line group access
code (default = 9 [UK/HK], 0 [Taiwan, Malaysia, Indone-
sia], or 81-84).
• Outside dial tone
• CO XXX displays (where XXX = line
number)
3. Dial the phone number or extension number. Dialed number displays