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Section 700 - Operation Chapter 3. System Features
ICX-50-700 ICX (International) issued October 2000 67
Considerations
• Trunks can only appear in one trunk group.
• If Automatic Call Routing is enabled, the MCO access code (default = 9 [UK/HK] and 0
[Taiwan/Malaysia/Indonesia]) automatically accesses the Automatic Route Selection (ARS)
features.
Trunk Interface
Description
The System supports several types of trunk Interfaces including the following:
• Direct Dial Inward (DDI)
• Integrated Services Digital Network (ISDN) - Basic Rate Interface (BRI)
• ISDN - Primary Rate Interface (PRI)
• Loop Start
Each trunk type supports various features such as Delayed Ringing, Night Ringing, etc.
Trunk Interface - DDI (Not Available on UK, TX or EX Model)
The DDI feature allows an extension to have a dedicated direct number. The dedicated number allows
calls to be made directly to the extension, without the caller going through the attendant.
The DDI number may have from 1 to 4 digits (typically 4).
Each DDI Trunk Interface card (VB-44520) supports up to 8 DDI trunks.
Hardware Requirements
• The -48V power supply is required.
Considerations
• The DDI Trunk card supports 1 to 4-digit dial-pulse (10 pps) or Dual Tone Multifrequency
(DTMF) signalling.
• DDI numbers must be between 0 and 9999.
Trunk Interface - ISDN BRI
The System supports ISDN BRI with the VB-44530 ISDN BRI interface unit. The VB-44530 is a T-
Point ISDN-BRI that supports 2 B (bearer) channels and 1 D (data) channel (2B + D; 144kbps or
192kbps). This unit connects to an ISDN Data Service Unit (DSU). Point-to-point and point-to-multi
operations are selectable.
The ISDN-BRI supports enblock setting and enblock setting at the sub-address.
Hardware Requirements
•N/A
Considerations
• A DSU is required (not available from Panasonic). Normally the DSU is supplied by the
telephone service provider.