Local Mode - Nortel SRG200 Configuration Manual

Page 24 of 254 Overview

Local Mode

NN43001-308 Standard 01.02
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.
An IP Phone at the SRG may be in Local Mode for different reasons:
1 IP Phone has just booted up and the Main office parameters are not yet
configured.
2 IP Phone cannot communicate to the main office because of a WAN
failure or a failure of the main office components.
When a telephone or trunk in the main office calls an SRG IP Phone
that has switched to Local Mode due to WAN failure, the call is treated
according to the main office call redirection configuration (such as
forwarding to voice mail or continuous ringback).
In the event that the IP Phones at the branch office lose the connection to the
main office CS1000 call server for any reason (WAN failure, main office call
server failure, main office Signaling Server failure), the SRG 50 reverts to
Local Mode automatically. Essentially, when VoIP connectivity is lost, each
IP Phone loses its Reliable UDP (RUDP) connection with the main office
terminal proxy server (TPS). The IP Phones at the branch office reboot and
reregister to the SRG 50, placing them in Local Mode.
After this occurs, the IP Phones displays an indication on the display area that
the set is in Local Mode of operation. This display is configurable by
installers to meet local language and usage norms.
In Local Mode, the IP users connected at the branch office are under the
control of the SRG 50 call services. As such, the normal main office call
server features are not available. The SRG 50 offers a basic feature set when
in Local Mode which allows IP Phones to continue to make and receive calls
May 2007
IMPORTANT!