Nortel Networks SRG 50 NN43001-307 - Manual (Page 19)

Normal Mode and Local Mode overview 19
• Network Signaling (NSIG) package 37. This package is optional for
SRG IP Phones to access set-based Network Class of Service (NCOS)
features.
• Adaptive Network Bandwidth Management package 407.
• Alternative Call Routing for Network Bandwidth Management.
For software and hardware requirements for SRG, see SRG50 Configuration
Guide (NN40140-500).
Normal Mode and Local Mode overview
Normal Mode and Local Mode overview provides a description of the
following sections:
• Normal Mode
• Local Mode
• Survivability
• Recovery to Normal Mode
• Local Mode operation
• Virtual trunks
Normal Mode
IP Phones that are physically located at the SRG but are registered with the
main office are operating in Normal Mode. In Normal Mode, the main office
provides centralized call processing to all applications transparently to all
IP Phones at the Branch Office. All IP Phones at the Branch, in Normal
Mode, are registered to the main office TPS and are controlled by the Call
Server at the main office.
Users of the SRG IP Phones receive the features, applications, key
layout, and tones of the main office Call Server. This provides feature and
application transparency between the branch office and the main office.
Local Mode
Users at the branch office may be in Local Mode, or survivable mode for
two different reasons:
1. IP Phone has just booted up.
2. IP Phone cannot communicate to the main office because of a WAN
failure or a failure of the main office components.
Nortel Communication Server 1000
Main Office Configuration Guide for SRG 50
NN43001-307 02.02 Standard
Release 5.0 3 December 2007
Copyright © 2005-2007, Nortel Networks
.