AT&T IP Flexible Reach Service
Nortel BCM50 Release 3.0 SIP Configuration Guide
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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 service.
For an overview of Nortel BCM 200/400 for IP Flexible Reach; please reference a
separate document named “Nortel BCM 200/400 Configuration Guide.”
Nortel BCM50
Private Side
Legacy
Circuit
PBX
AT&T Managed
With
Voice GW
Call Control
Element
Public Side
Switch
AT&T
Managed
Router
With NAT
IP Border
Element
Network
Gateway
Border
Element
PST
Application
Server
Figure 1: AT&T IP Flexible Reach 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.
• The following interfaces are provided on all three variants of the BCM50
main module:
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