Nortel Networks NN43021-110 manual SIP Proxy

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54System architecture

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.

SIP Proxy

Communication Server (CS) 1000 Release 5.5 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 5.5, 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.

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

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Contents Communication Server 1000M Meridian 1 Large System Overview Legal Notice Contents Copyright 2003-2008 Nortel Networks Other Revision HistoryNew in this Release How to get help Getting help from the Nortel Web siteGetting help through a Nortel distributor or reseller Subject Applicable systemsSystem migration Intended audienceConventions TerminologyRelated information NTPsIntroduction Contents IntroductionProduct description System options CS 1000M HGand Meridian 1 Option 51CMeridian 1 Option 51C CS 1000M HG Memory options CS 1000M SGand Meridian 1 PBX 61C CP PIV Meridian 1 PBX 61C CP PIVor Meridian 1 Option 61CCS 1000M SG PDU CS 1000M MGand Meridian 1 PBX 81C CP PIV Meridian 1 PBX 81C CP PIVor Option 81CCS 1000M MG Msdl System modules NT4N41 Core/Network moduleCore side Network sideNT5D21 Core/Network module NT8D35 Network module NT8D35 Network module Fiber Network Fabric NT8D37 Intelligent Peripheral Equipment module Fiber Remote IPE module Carrier Remote IPEProduct description System architecture Hardware architecture Common control complex System architecture Hardware architecture CS 1000M SGand Meridian 1 PBX 61C CP PIVcore complex Network interface Network organization Superloop network configurations System architecture Intelligent Peripheral Equipment Intelligent Peripheral Equipment cards Number Terminations Intelligent Peripheral Equipment remote location Terminal equipment Digital telephonesAttendant consoles Power equipment AC powerDC power Candeo DC power system Signaling ServerNortel Common Processor Pentium Mobile server International Business Machines X306m server Hewlett Packard DL320-G4 serverSIP/H.323 Signaling Gateways Terminal Proxy ServerNetwork Routing Service SIP Proxy Software architecture Element ManagerNRS Manager Office data FirmwareSoftware Resident programsService change and print routines Maintenance diagnosticsNonresident programs Equipment data dump Configuration optionsTraffic Software auditFiber Remote Multi-IPE Interface Fundamentals N43021-556 Meridian 1 Large Systemto Carrier Remote IPE links Branch Office Geographic RedundancyAnalog Analog signalBattery backup ArchitectureCentral processing unit CPU ConfigurationCentral Office CO Circuit cardsCPCI Transition card Diagnostic programsDigital signal Electromagnetic interference EMIRandom-access memory RAM Module power suppliesPower distribution unit PDU LineSoftware generic Read-only memory ROMRedundancy System monitorTop cap TrunkUniversal equipment module UEM Page Nortel Communication Server
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