Nortel Networks NN43021-110 User Manual

Page 55

Hardware architecture

SIP Proxy

Communication Server (CS) 1000 Release 5.0 adds a transaction stateful
SIP Proxy to the IP Peer Network.

A SIP Proxy acts as both a server and a client. A SIP Proxy receives
requests, determines where to send the requests, and acting as a client on
behalf of SIP endpoints, passes requests to another server.

A SIP Proxy makes the following features and functionality, which are
provided by CS 1000 Release 5.0, possible:

1. Transport Layer Security (TLS).

TLS provides the NRS with private, secure signaling, message
authentication, confidentiality, and integrity through end-to-end
encryption of media exchanged between two SIP endpoints.

2. Mixed transport layer protocol.

A mixed transport layer protocol enables gateways using TCP, TLS over
TCP, or UDP to interoperate.

3. Network features.

By default the SIP Proxy and Redirect Server functions as a SIP Proxy.
However, an endpoint can request transaction by transaction that the
SIP Proxy act as a SIP Redirect Server.

A SIP Redirect Server receives requests, but does not pass the requests
to another server. Instead, a SIP Redirect Server sends a response
back to the SIP endpoint, indicating the IP address of the called user.

4. Post-routing SIP URI modification.

5. Transaction forking.

Element Manager

Element Manager is a software application that provides a web interface
to support administration of system components, including the Signaling
Server. With Element Manager, single web pages provide access to
information traditionally spread throughout multiple overlays.

Element Manager provides tools to configure and maintain the following
components:

•

Call Servers

•

Media Gateway (MG 1000E, Expander)

•

MG 1000B

•

Signaling Servers

•

Voice Gateway Media Cards

Nortel Communication Server 1000

Communication Server 1000M and Meridian 1 Large System Overview

NN43021-110

01.03

Standard

Release 5.0

18 February 2008