Distributed Communications System And Isdn - Avaya IP600 Overview

Distributed Communication System — Integrated
SDN and Non-Integrated SDN

Distributed Communications System and ISDN

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Feature transparency means that features work the same from a user's perspective,
whether the telephones involved are assigned to the same switch or to different
switches. Users in a DCS can dial each other with four or five digits as if they were all
on the same switch.
Here are some examples of feature transparency in a DCS:
• Leave Word Calling (LWC) allows you to press a button on your telephone and
leave a standard "call me" message with your name and phone number. When
your Avaya IP600 is linked with other switches in a DCS, you can call any
employee in the DCS complex and press the LWC button to automatically leave a
standard message.
Calling-Party Name Display — If your telephone is equipped with a digital
•
display, information about the person calling you is displayed before you pick up
the receiver. With DCS you know who is calling and whether that person is in a
nearby building or across the country.
Centralized Messaging services for an entire DCS complex (subnetwork) may be
•
coordinated by one system, depending on the traffic volumes and versions of the
main and remote switches. This means that switches with smaller messaging
requirements do not share a voice messaging system with another switch.
Avaya IP600's DCS features DCS over Integrated Software Defined Network-
Primary Rate Interface (ISDN-PRI) with path replacement for optimizing trunks.
Thus, when you transfer out of your AUDIX voice messaging system, for example,
Avaya IP600 sets up a new path that optimizes system resources.
DCS nodes are connected by digital trunks (for example, using DS1 or ISDN-PRI
facilities). Avaya IP600 can send DCS messages over ISDN-PRI D channels. As a
result, you are not limited to private or leased facilities between your various
locations. You can also use public-network services. (See
The SDN supports every DCS transparency except the following:
DCS attendant control of trunk group access
•
• DCS attendant direct trunk group selection
• DCS busy verification of terminals
All other capabilities and limitations associated with the DCS still apply.
AUDIX systems networked via DCS can also be supported over ISDN-PRI. (See
Chapter 4, Intuity AUDIX Messaging, for more information.)
Overview for Avaya IP600 Internet Protocol Communications Server
555-233-001 — Issue 5 — November 2000
Figure 6.)
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