
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.
Customer Site
Managed
Router
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.
BVoIP
Network
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