Panasonic ICX Manual

68

ICX (International) issued June 2000

ICX-45-700

Chapter 3. System Features

Section 700 - Operation

The System supports ISDN PRI with the VB-44540 ISDN PRI Interface unit. The VB-44540 is a T/S-
Point ISDN PRI that supports 30B (for UK) or 23B (for HK) (bearer) channels and 1 D (data) channel 
(30B + D; 2M) (23B + D; 1.5M). This unit connects to an ISDN DSU.

Up to 3 units may be installed in a CCU if you use full channel (30B + D)/(23B + D or 24B). A 
maximum of 18 units may be utilised in a fully equipped system. When all 30 or 23 channels on a unit 
are utilised in one card, four or three slot positions are required. 

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N/A

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N/A

The VB-44510UK Loop Start interface unit supplies 8 loop start analog exchange line circuits. In 
addition, the VB-44510UK Loop Start interface unit may alternatively be used to connect to loop start 
exchange lines.

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VB-44510UK Loop Start Card

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N/A

Several types of trunk ringing are available for the System including the following:

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Direct Dial Inward (DDI) Ringing

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Direct Line (DL) Ringing

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Direct Inward System Access (DISA) Ringing

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Multiple Ringing

These ringing types may be used in any combination in the System.

DDI Ringing allows calls on a common trunk to be directed to ring to a specific extension or group of 
extensions, etc. based upon the final digits dialled. These final digits are received from the DDI trunk 
and compared to a DDI Table that determines where the calls should ring. Depending on the 
assignments in the DDI Table, names or trunk numbers are displayed. (Names can be up to 10 digits 
long.)

DDI Ringing can be very useful by sending calls directly to a specific extension, hunt group, etc. 
based upon the number dialled. Since a relatively small number of trunks handle the DDI calls, this 
can be more cost efficient than DL trunks or attendant group answering and transfer. (DDI may send a