Overview; Figure 1: At&T Ip Flexible Reach Network - Nortel BCM200 Configuration Manual

Nortel BCM200/400 (Release 4.0.2.03a) H.323 Configuration Guide

3 Overview

This section provides a service overview of the Nortel Business Communication
Manager 200/400 (BCM200/400) IP PBX integration with AT&T IP Flexible Reach
service. For an overview of Nortel BCM50 for IP Flexible Reach; please reference
a separate document named "Nortel BCM50 Configuration Guide."
Private Side
AT&T
Switch
Managed
Router
With NAT
Nortel BCM200/400
The Nortel BCM customer premises site shall consist of the following
components.
• Nortel IP 2004 or IP 2002 phones – These phones use the Nortel
proprietary UNIStim signaling protocol to communicate to the Nortel
BCM200/400 IP PBX for call feature and routing support. These phones
can be connected to a Nortel Ethernet switch (ES 470, ERS 5520, etc.)
that supplies in-line power (IEEE 802.3af) to the phones.
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AT&T IP Flexible Reach Service
Application
Server
Call Control
Element
Public Side
IP Border
Element
Figure 1: AT&T IP Flexible Reach Network
Issue 1.9
PST
Network
Gateway
Border
AT&T Managed
Element
With
Voice GW
Legacy
Circuit
PBX
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