Nortel Networks NN43021-110 User Manual

Page 54

System architecture

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 5.0.

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.

The H.323 Gatekeeper and the SIP Redirect Server can reside on the
same Signaling Server. Examples of H.323 and SIP-compatible endpoints
needing the services of the NRS are CS 1000E. The NRS also supports
endpoints that do not support H.323 Registration, Admission, and Status
(RAS) or SIP registration with the NRS.

Note: Systems that do not support H.323 RAS procedures and H.323
Gatekeeper procedures are referred to as non-RAS or static endpoints.

Each CS 1000E in an IP Peer network must register to the NRS. The NRS
software identifies the IP addresses of PBXs based on the network-wide
numbering plan. NRS registration eliminates the need for manual
configuration of IP addresses and numbering plan information at every site.

Nortel Communication Server 1000

Communication Server 1000M and Meridian 1 Large System Overview

NN43021-110

01.03

Standard

Release 5.0

18 February 2008