Nortel Networks COMMUNICATION SERVER 1000 NN43021-110 - Manual (Page 53)

Hardware architecture 53
Network Routing Service
NRS for CS 1000 Release 5.5 software is offered in two versions: a SIP
Redirect Server NRS and a SIP Proxy NRS.
The SIP Redirect Server NRS is hosted either co-resident with Signaling
Server applications, or in a stand-alone mode on a dedicated Common
Processor Pentium Mobile (CP PM) server running the VxWorks™
real-time operating system. There are no changes to the SIP Redirect
Server NRS in CS 1000 Release 5.5.
The SIP Proxy NRS is hosted in a stand-alone mode on a dedicated
commercial off the shelf server running the Linux™ real-time operating
system. The SIP Proxy NRS is referred to as the Linux-based NRS.
The NRS application provides network-based routing, combining the
following into a single application:
• H.323 Gatekeeper — The H.323 Gatekeeper provides central
dialing plan management and routing for H.323-based endpoints and
gateways.
•
SIP Redirect Server — The SIP Redirect Server provides central
dialing plan management and routing for SIP-based endpoints and
gateways.
• NRS Database — The NRS database stores the central dialing
plan in XML format for both the SIP Redirect Server and the H.323
Gatekeeper. The SIP Redirect Server and H.323 Gatekeeper both
access this common endpoint and gateway database.
•
Network Connect Server (NCS) — The NCS is used only for Virtual
Office, Branch Office, and Geographic Redundancy solutions.
• NRS Manager web interface — The NRS provides its own web
interface to configure the SIP Redirect Server, the H.323 Gatekeeper,
and the NCS.
The NRS application provides routing services to both H.323 and
SIP-compliant devices. The H.323 Gatekeeper can be configured to
support H.323 routing services, while the SIP Redirect Server can be
configured to support SIP routing services.
Nortel Communication Server 1000
Communication Server 1000M and Meridian 1 Large System Overview
NN43021-110 02.05 Standard
30 September 2008
Copyright © 2003-2008 Nortel Networks
.