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AT&T IP Flexible Reach and AT&T IP Flexible Reach with AT&T Business in a Box

Nortel BCM50 Release 3.0 SIP Configuration Guide

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

Issue 1.5 Page 9 of 38

3 Overview

This section provides a service overview of the Nortel Business Communication

Manager 50 (BCM50) IP PBX integration with AT&T IP Flexible Reach and AT&T

IP Flexible Reach with AT&T Business in a Box services.

Figure 1: AT&T BVoIP Network

The Nortel BCM50 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

BCM50 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.

Nortel BCM50

Private Side

Public Side

FAX

Switch

Customer Site

AT&T

Managed

Router

IP Border

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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