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AT&T IP Flexible Reach

Nortel BCM450 Release 1.0 SIP Configuration Guide

*Nortel, Nortel Networks, Nortel (Logo), the Globemark, CS1000 are trademarks of Nortel Networks.

Issue 0.4 Page 8 of 33

3 Overview

This section provides a service overview of the Nortel Business Communication

Manager 450 (BCM450) IP PBX integration with AT&T IP Flexible Reach services.

Figure 1: AT&T BVoIP Network

The Nortel BCM450 customer premises site shall consist of the following

components.

• Nortel IP 200x, 11xx, 12xx phones* – These phones use the Nortel

proprietary UNIStim signaling protocol to communicate to the Nortel

BCM450 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.

• The following interfaces and applications can also be used on the

BCM450. They include (but are not limited to):

Nortel BCM450

Private Side

Public Side

FAX

Switch

Customer Site

AT&T

Managed

Router

IP Borde

Element



Customer Premises



Phones and IP PBX Server

in Private Address space



AT&T Managed Router



Customer Sites connect to ATT

IP Border Element (IPBE)

Application

Servers,

Network

Gateways,

etc.

AT&T

BVoIP

Network

PSTN

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