Nortel Networks Server 1000S User Manual

Title page  
Nortel Communication Server 1000  
Nortel Communication Server 1000 Release 4.5  
Communication Server 1000S  
Overview  
Document Number: 553-3031-010  
Document Release: Standard 3.00  
Date: August 2005  
Year Publish FCC TM  
Copyright © Nortel Networks Limited 2005  
All Rights Reserved  
Produced in Canada  
Information is subject to change without notice. Nortel Networks reserves the right to make changes in design  
or components as progress in engineering and manufacturing may warrant.  
Nortel, Nortel (Logo), the Globemark, This is the Way, This is Nortel (Design mark), SL-1, Meridian 1, and  
Succession are trademarks of Nortel Networks.  
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4
Revision history  
August 2005  
Standard 3.00. This document is up-issued to support Communication  
Server 1000 Release 4.5.  
September 2004  
October 2003  
Standard 2.00. This document is up-issued for Communication Server 1000  
Release 4.0.  
Standard 1.00. This document is a new NTP for Succession 3.0. It was created  
to support a restructuring of the Documentation Library. This document  
contains information previously contained in the following legacy document,  
now retired: System Overview (553-3023-010).  
Communication Server 1000S Overview  
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Page 4 of 44 Revision history  
553-3031-010 Standard 3.00 August 2005  
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Contents  
Communication Server 1000S Overview  
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Page 6 of 44 Contents  
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About this document  
This document is a global document. Contact your system supplier or your  
Nortel representative to verify that the hardware and software described are  
supported in your area.  
Subject  
WARNING  
Before a CS 1000S system can be installed, a network  
assessment must be performed and the network must be  
VoIP-ready.  
If the minimum VoIP network requirements are not met,  
the system will not operate properly.  
For information on the minimum VoIP network  
requirements and converging a data network with VoIP,  
refer to Data Networking for Voice over IP  
(553-3001-160).  
This document provides an overview of the general design and features of the  
CS 1000S system.  
Note on legacy products and releases  
This NTP contains information about systems, components, and features that  
are compatible with Nortel Communication Server 1000 Release 4.5  
software. For more information on legacy products and releases, click the  
Communication Server 1000S Overview  
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About this document  
Technical Documentation link under Support & Training on the Nortel  
home page:  
Applicable systems  
This document applies to the Communication Server 1000S (CS 1000S)  
system.  
Intended audience  
This document is intended for individuals responsible for the sale,  
acquisition, planning, or installation of a CS 1000S system.  
Conventions  
In this document, the CS 1000S system is referred to generically as “system.”  
Related information  
This section lists information sources that relate to this document.  
NTPs  
The following NTPs are referenced in this document:  
Data Networking for Voice over IP (553-3001-160)  
IP Peer Networking: Installation and Configuration (553-3001-213)  
Branch Office: Installation and Configuration (553-3001-214)  
WLAN IP Telephony: Installation and Configuration (553-3001-304)  
Integrated Conference Bridge: Service Implementation Guide  
(553-3001-358)  
Hospitality Integrated Voice Services: Service Implementation Guide  
(553-3001-359)  
Integrated Recorded Announcer: Service Implementation Guide  
(553-3001-360)  
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About this document  
Integrated Call Director: Service Implementation Guide (553-3001-361)  
Integrated Call Assistant: Service Implementation Guide  
(553-3001-362)  
IP Line: Description, Installation, and Operation (553-3001-365)  
Telephones and Consoles: Description, Installation, and Operation  
(553-3001-367)  
IP Phones: Description, Installation, and Operation (553-3001-368)  
DECT: Description, Planning, Installation, and Operation  
(553-3001-370)  
Online  
To access Nortel documentation online, click the Technical Documentation  
link under Support & Training on the Nortel home page:  
CD-ROM  
To obtain Nortel documentation on CD-ROM, contact your Nortel customer  
representative.  
Communication Server 1000S Overview  
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Description and features  
Introduction  
WARNING  
Before a CS 1000S system can be installed, a network  
assessment must be performed and the network must be  
VoIP-ready.  
If the minimum VoIP network requirements are not met,  
the system will not operate properly.  
For information on the minimum VoIP network  
requirements and converging a data network with VoIP,  
refer to Data Networking for Voice over IP  
(553-3001-160).  
The CS 1000S is an IP PBX that was introduced to address the increasing  
demand for Voice over IP (VoIP) and support the convergence of voice and  
data networks. In addition to supporting powerful new IP features, including  
Session Initiation Protocol (SIP), the CS 1000S provides continued support  
of the traditional Meridian suite of features.  
CS 1000S expands the system’s capabilities to leverage the flexibility of IP  
WANs. It provides seamless network integration, simplified management,  
greater flexibility in network deployment, and reduced costs for supporting  
an increasingly distributed global user community.  
CS 1000S is more than an IP PBX. It is the architecture that evolves, using  
open standards, to deliver future Advanced Applications, Interactive  
Multimedia Services, Integrated Desktops, and Management Services.  
Migrating to an IP telephony network  
CS 1000S architecture provides an IP-based alternative to traditional  
Meridian 1 architecture. It is designed to enable IP-based communication  
models while protecting the investment of Meridian 1 end users as they  
migrate to new technologies. Figure 1 illustrates the key components of this  
architecture.  
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Description and features  
Page 13 of 44  
Figure 1  
Software architecture for telephony  
Telephony  
Feature  
Proccessing  
Meridian 1  
CS 1000  
Circuit Switching Manager  
Virtual Connection Manager  
IP  
Phone  
control  
Media  
BW  
control  
Digital  
Analog PSTN/ Other  
SIP ...  
XML  
H.323  
Telephones  
Telephones  
ISDN  
TDM  
Circuit Switching Equipment  
Interface for IP-Based Devices  
Internet Enabling  
553-AAA2129  
Telephony Feature Processing is based on the existing Meridian 1 Call  
Processing software and provides industry-leading feature capabilities.  
The Virtual Connection Manager allows IP-based devices that are registered  
with the Call Server to access the same feature capabilities as existing  
telephony devices. In this way, the Meridian 1 feature set is made available  
to evolving IP devices and soft clients, and is the switching foundation of  
CS 1000S. In addition to access to the Telephony Feature Processing of a Call  
Server, devices can also access other services in the network, such as XML  
and IM. The Virtual Connection Manager supports IP Phones and a wider  
suite of devices and services.  
Communication Server 1000S Overview  
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Description and features  
The Circuit Switching Manager evolved from Meridian 1 software. This  
migration strategy enables Telephony Feature Processing for future releases  
of CS 1000S to control existing Meridian 1 hardware components. In this  
way, the investment in existing equipment is preserved while new capabilities  
are added at a managed pace.  
Features  
Key features of the CS 1000S system are as follows:  
capacity  
flexibility and redundancy  
software applications  
enhanced system management  
terminal equipment  
interworking/interoperability  
Capacity  
The CS 1000S Call Server can support up to four Media Gateway 1000S  
(MG 1000S) systems, and each MG 1000S can support a Media  
Gateway 1000S Expander (MG 1000S Expander).  
The MG 1000S has a Small System Controller (SSC) card and has four  
available slots for flexible configurations of line and trunk cards.  
The Call Server can support up to 1000 IP Phones.  
Flexibility and redundancy  
The CS 1000S can be deployed in many flexible configurations in a LAN or  
WAN environment. The system can be deployed in a single location, multiple  
buildings in a campus setting, or a network of multiple locations with  
distributed Call Servers or branch offices.  
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Description and features  
Page 15 of 44  
The CS 1000S provides a number of capabilities to ensure that telephony is  
available in the event of equipment failure at a site. CS 1000S provides the  
following component redundancy:  
Call Server with automatic database distribution  
Signaling Server software, including H.323 Gateway and IP Phone  
software  
H.323 Gatekeeper  
H.323 Gateway interface to Gatekeeper  
Campus-distributed MG 1000S in Survival Mode  
Refer to “Configuration options” on page 33 for more information on system  
deployment and reliability strategies.  
Software applications  
CS 1000S supports a broad suite of applications, including the following:  
CallPilot applications  
CallPilot is a multimedia messaging system that offers a single solution for  
managing information, including the following:  
voice, fax, and e-mail messages  
telephone calls (including conference)  
calendars  
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Description and features  
directories  
call logs  
CallPilot 2.0  
CallPilot 2.0 includes the 501t and the 1002rp messaging platforms as  
replacements for the existing standalone platforms.  
CallPilot 1.5 Mini  
CallPilot 1.5 Mini is a less expensive, embedded messaging stand-alone  
platform that provides Unified Messaging and base Voice Messaging  
capabilities in both Meridian 1 and CS 1000S switching environments.  
Symposium Call Center Server  
Symposium Call Center Server (SCCS) offers a suite of applications that  
includes call processing and agent handling, extensive management and  
reporting capabilities, third-party application interfaces, and real-time  
displays for supervisors and managers. For further information, see the  
Symposium Call Centre Server documentation.  
Nortel Integrated Recorded Announcer  
Nortel Integrated Recorded Announcer enables the user to manage recorded  
announcements using a Browser User Interface (BUI), a Telephone User  
Interface (TUI), or a text-based user interface. For further information, see  
Integrated Recorded Announcer: Service Implementation Guide  
(553-3001-360).  
Nortel Remote Gateway 9150  
Nortel Remote Gateway 9150 enables remote employees of central offices to  
access CS 1000S features and functionality using an IP WAN. The Remote  
Gateway 9150 unit installs at the remote site and communicates with the  
central site using a 10BaseT Ethernet or ISDN Basic Rate Interface (BRI)  
connection. It uses VoIP technology to route voice and signaling packets  
between the remote office site and the CS 1000S main site, enabling seamless  
integration.  
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Description and features  
Page 17 of 44  
The VoIP features automatically switch from the IP network to the PSTN,  
when voice Quality of Service (QOS) falls below a pre-determined threshold.  
IP Telephony resumes when QOS levels return to an acceptable level.  
Remote Gateway 9150 supports a maximum of 32 digital telephones.  
For further information, see Remote Gateway 9150: Installation and  
Administration Guide (555-8421-215).  
Nortel Integrated Call Assistant  
The Nortel Integrated Call Assistant can route calls to desired destinations  
after a series of greetings are played. The destination is based on the caller’s  
telephone keypad strokes. For further information, see Integrated Call  
Assistant: Service Implementation Guide (553-3001-362).  
Nortel Integrated Conference Bridge  
The Nortel Integrated Conference Bridge enables a user to schedule and  
manage conference bridges using a Browser User Interface (BUI) or a  
Telephone User Interface (TUI). These interfaces enable a user to schedule  
and configure one-time and recurrent conferences. For further information,  
see Integrated Conference Bridge: Service Implementation Guide  
(553-3001-358).  
Nortel Integrated Call Director  
The Nortel Integrated Call Director enables users to automatically forward  
incoming telephone calls to another number, such as a cellular or home  
telephone. The Integrated Call Director continues to forward the call until the  
call is answered, or all the options are exhausted. For further information, see  
Integrated Call Director: Service Implementation Guide (553-3001-361).  
Nortel Hospitality Integrated Voice Services  
Nortel Hospitality Integrated Voice Services provide the hospitality services  
of Automatic Wake Up (AWU) and Do Not Disturb (DND). The guest dials  
an access DN and follows instructions until a confirmation message plays to  
activate a feature. For further information, see Hospitality Integrated Voice  
Services: Service Implementation Guide (553-3001-359).  
Communication Server 1000S Overview  
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Description and features  
Enhanced system management  
CS 1000S supports a suite of value-added management capabilities for  
multiple systems that reduces a customer’s total cost of ownership. These  
include Optivity Telephony Manager (OTM) and Element Manager.  
Optivity Telephony Manager  
Optivity Telephony Manager (OTM) provides management simplicity and  
flexible control. OTM features include the following:  
Lightweight Directory Access Protocol (LDAP) directory integration  
station administration  
call accounting  
call tracking  
traffic analysis  
maintenance  
alarm management  
centralized management  
multi-user capability  
web-based functionality  
customizable reporting  
import/export utility  
scheduled tasks  
disaster recovery tools  
These features save time and facilities costs, simplifying the management of  
a complex network.  
Element Manager  
Element Manager is a simple and user-friendly web-based interface that  
supports a broad range of system management tasks, including:  
configuration and maintenance of IP Peer and IP telephony features  
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Description and features  
Page 19 of 44  
configuration and maintenance of traditional routes and trunks  
configuration and maintenance of numbering plans  
configuration of Call Server data blocks (such as configuration data,  
customer data, Common Equipment data, D-channels)  
maintenance commands, system status inquiries, backup and restore  
functions  
software download, patch download, patch activation  
Element Manager has many features to help administrators manage systems  
with greater efficiency. Examples are as follows:  
Web pages provide a single point-of-access to parameters that were  
traditionally available through multiple overlays.  
Parameters are presented in logical groups to increase ease-of-use and  
speed-of-access.  
The "hide or show information" option enables administrators to see  
information that relates directly to the task at hand.  
Full-text descriptions of parameters and acronyms help administrators  
reduce configuration errors.  
Configuration screens offer pre-selected defaults, drop-down lists,  
checkboxes, and range values to simplify response selection.  
The Element Manager web server resides on the Signaling Server and can be  
accessed directly through a web browser or Optivity Telephony Manager  
(OTM). The OTM navigator includes integrated links to each network system  
and their respective instances of Element Manager.  
Terminal equipment  
The CS 1000S supports the following terminal equipment:  
IP Phones  
802.11 Wireless LAN  
wireless telephones  
digital telephones  
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Description and features  
IP Phone adapter  
analog telephones and devices  
attendant consoles  
For further information on analog and digital telephones, see Telephones and  
Consoles: Description, Installation, and Operation (553-3001-367). See  
IP Phones: Description, Installation, and Operation (553-3001-368) for  
information on IP Phones.  
IP Phones  
IP Phones provide the desktop clients for CS 1000S IP Telephony. The  
functionality and call features of these IP Phones are similar to that of a  
standard digital telephone, such as the M2616. The CS 1000S system  
supports the following IP Phones:  
Nortel IP Phone 2001  
Nortel IP Phone 2002  
Nortel IP Phone 2004  
Nortel IP Phone 2007  
Nortel IP Audio Conference Phone 2033  
Nortel IP Softphone 2050  
Nortel Mobile Voice Client (MVC) 2050  
WLAN Handsets 2210/2211  
802.11 Wireless LAN  
CS 1000S supports the 802.11 Wireless LAN. The 802.11 Wireless LAN  
requires an H.323 Symbol Wireless client terminal.  
Wireless telephones  
CS 1000S supports 802.11 Wireless IP Gateway, the WLAN IP Telephony  
Manager 2245 for the WLAN Handsets 2210/221, and Nortel Integrated  
DECT (DECT) systems.  
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Description and features  
Page 21 of 44  
802.11 Wireless IP Gateway  
The e-mobility Meridian Gateway supports communication between the  
circuit-switched telephony network and the H.323 Wireless IP terminals on a  
customer’s corporate IP network. For further information, see WLAN IP  
Telephony: Installation and Configuration (553-3001-304).  
DECT  
The DECT system is an application that enables users to move freely about  
their work sites using wireless handsets, and keep in communication with  
end-users and suppliers. Missed calls are reduced and employee productivity  
is increased due to quick employee response times and multi-tasking  
flexibility. For further information, see DECT: Description, Planning,  
Installation, and Operation (553-3001-370).  
Digital telephones  
The CS 1000S system supports a wide range of Digital Line cards that  
provide global telecommunications market interfaces.  
The CS 1000S system supports the M3900 series Meridian Digital  
Telephones. This includes the M3901 Entry Level Telephone, the M3902  
Basic Telephone, the M3903 Enhanced Telephone, the M3904 Professional  
Telephone, and the M3905 Call Center Telephone.  
In conformance with the Evergreen policy, the CS 1000S system also  
supports other digital telephones, including the M2006, M2008, M2008HF,  
M2616, M2016S, M2216ACD, and M2317 digital telephones.  
IP Phone adapter  
The CS 1000S system supports the IP Phone adapter package, for the M26xx  
and M39xx telephones. The IP Phone adapter package is intended for local  
deployment and does not support analog PSTN fallback.  
Analog telephones and devices  
The CS 1000S system supports a wide range of Analog Line cards that  
provide analog (500/2500-type) telephones and T.38 Fax interfaces.  
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Description and features  
Attendant consoles  
The CS 1000S system supports an Attendant PC software console and the  
M2250 attendant console.  
The Attendant PC software enables users to perform attendant console and  
call processing functions on a Windows® PC using a mouse or keyboard.  
The Attendant PC combines the call-processing power of the M2250  
attendant console with the information-processing and storage power of a PC,  
enhancing attendant services.  
Interworking/Interoperability  
The CS 1000S uses the standard H.323 protocol to support interworking with  
other vendors. Interoperability testing is required to determine which  
products are compatible with CS 1000S systems. A number of products are  
supported as part of the development, including the following:  
BCM 2.5+  
CS 1000M using an IP Trunk 2.x up-issue  
Interworking with Nortel’s CS 1000M and BCM products is provided to  
enable enterprise networks to smoothly migrate from traditional TDM-based  
PBXs to IP-based telephony products.  
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32  
Page 23 of 44  
System architecture  
Contents  
This section contains information on the following topics:  
Communication Server 1000S Overview  
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System architecture  
Hardware architecture  
A typical CS 1000S system consists of the following major hardware  
components:  
NTDU30 Call Server  
NTDU27 Signaling Server  
NTDU14 Media Gateway 1000S (MG 1000S)  
NTDU15 Media Gateway 1000S Expander (MG 1000S Expander)  
IP Phones  
customer-supplied Ethernet Layer 2 switch  
Power over LAN unit (optional)  
Figure 2 on page 25 shows the major hardware components installed in a  
customer-supplied 19-inch rack.  
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System architecture  
Page 25 of 44  
Figure 2  
CS 1000S components in a rack  
NTDU30 Call Server  
NTDU27 Signaling Server  
NTDU14 Media Gateway 1000S  
NTDU15 Media Gateway  
1000S Expander  
Customer Supplied  
Ethernet Switch  
Power over LAN unit (optional)  
553-AAA2256  
Communication Server 1000S Overview  
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System architecture  
Call Server  
The Call Server provides telephony services, such as call processing, and  
supports trunking features. It also acts as a database server for  
synchronization of configuration information with all MG 1000S systems.  
A CS 1000S system can control a maximum of four MG 1000S systems and  
Expanders.  
A CS 1000S system with one Call Server supports up to 1000 IP Phones. You  
can network a CS 1000S system with other CS 1000S systems to support  
larger numbers of IP Phones.  
Small System Controller card  
The NTDK20 Small System Controller (SSC) card in the Call Server is the  
primary system processor. It controls the telephony services and call  
processing. Each MG 1000S is also equipped with an SSC card.  
The Call Server SSC controls the call-processing features of IP Phones and  
trunk interfaces when in normal mode of operation.  
The Call Server SSC synchronizes the configuration information on all  
MG 1000S SSC cards. The configuration data on all MG 1000S SSC cards  
always exactly matches the Call Server SSC configuration data.  
The card’s Security Device enables the activation of features assigned to the  
system, through the use of a series of keycodes.  
Media Gateway 1000S SSC card  
The SSC card in the MG 1000S controls the MG 1000S interface and  
application cards, and acts as a survivable call processor. All MG 1000S SSC  
cards are synchronized with the call processing on the Call Server SSC card.  
This synchronization enables an MG 1000S SSC card to take over local call  
processing if the primary Call Server fails to respond.  
If the Call Server fails to respond, each MG 1000S SSC can become its own  
independent call processor. This means that in the event of Call Server failure,  
one MG 1000S SSC does not act as a Call Server for the rest of the system;  
they are all independent.  
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System architecture  
Page 27 of 44  
Signaling Server  
CS 1000S systems use a Signaling Server. The Signaling Server is an  
industry-standard, PC-based server that provides a central processor to drive  
H.323 and Session Initiation Protocol (SIP) signaling for IP Phones and  
IP Peer Networking. It provides signaling interfaces to the IP network using  
software components that operate on the VxWorks™ real-time operating  
system.  
The Signaling Server has both an ELAN and TLAN network interface. The  
Signaling Server communicates with the Call Server through the ELAN  
subnet.  
The Signaling Server is mounted in a 19-inch rack. The Signaling Server can  
be installed in a load-sharing redundant configuration for higher scalability  
and reliability.  
The following software components operate on the Signaling Server:  
All the software elements can coexist on one Signaling Server or reside  
individually on separate Signaling Servers, depending on traffic and  
redundancy requirements for each element.  
For more information about H.323 and SIP Trunking, refer to IP Peer  
Networking: Installation and Configuration (553-3001-213).  
Communication Server 1000S Overview  
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System architecture  
Terminal Proxy Server  
The Terminal Proxy Server (TPS) acts as a signaling gateway between the IP  
Phones and the Call Server using the UNIStim protocol. It performs the  
following functions:  
converts the IP Phone UNIStim messages into messages the Call Server  
can interpret  
allows IP Phones to access telephony features provided by the Call  
Server  
The TPS also controls the IP Phone registration.  
SIP/H.323 Signaling Gateways  
SIP/H.323 Signaling Gateways are software components configured on  
virtual loops, similar to IP Phones. SIP/H.323 Signaling Gateways bridge  
existing call processing features and the IP network. They also enable access  
to the routing and features in the MCDN feature set.  
Note 1: The SIP/H.323 Signaling Gateway must register with the  
Network Routing Service (NRS).  
Note 2: Virtual TNs enable you to configure service data without  
hardwiring IP Phones to the CS 1000S system. Virtual TNs are  
configured in LD 97.  
To support IP Peer Networking, dual Call Servers in a CS 1000S must be  
associated with Signaling Servers that run SIP/H.323 Signaling Gateway  
software. The number of Signaling Servers required depends on the capacity  
and level of redundancy required.  
Network Routing Service  
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.  
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System architecture  
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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 Media  
Gateway 1000B (MG 1000B) and Virtual Office 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.  
Each system in an IP Peer network must register to the NRS. The NRS  
software identifies the IP addresses of systems 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.  
Element Manager  
Element Manager is a software application that provides a web interface to  
configure and maintain system components, including the Signaling Server.  
Single web pages provide access to information traditionally spread into  
multiple overlays.  
For more information on the Element Manager application, see “Element  
Media Gateway 1000S  
The MG 1000S holds Intelligent Peripheral Equipment (IPE) cards and  
application cards. In a normal operational state, the Call Server controls the  
MG 1000S. The MG 1000S processor provides low-level control of the  
interface cards installed in the MG 1000S slots, and communicates with the  
Call Server for feature operation.  
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System architecture  
The MG 1000S supports a Small System Controller (SSC) card and four slots  
for flexible configurations of line, trunk, and application cards.  
Note: You can configure the SSC in the MG 1000S for survivability to  
assume local call processing if the Call Server cannot be accessed. If the  
MG 1000S is not configured as survivable, then the MG 1000S is  
out-of-service until the Call Server is again accessible.  
Voice Gateway Media Cards are installed in the MG 1000S. A Voice  
Gateway Media Card provides transcoding between IP and circuit-switched  
protocol.  
Each MG 1000S can support one MG 1000S Expander.  
Ethernet switch (customer-supplied)  
The customer-supplied Layer 2 Ethernet switch transmits data packets to  
interconnected Ethernet-attached devices. The switch directs the data only to  
the targeted device, rather than to all attached devices. See Data Networking  
for Voice over IP (553-3001-160) for details.  
Power over LAN (optional)  
An optional Power over LAN unit adds power and data communication over  
standard Category 5 LAN drops for powering IP Phones. The Power over  
LAN unit eliminates the need to connect each telephone to an AC power  
outlet. This saves in desktop wiring and enables the use of a centralized  
Uninterruptible Power Supply (UPS) for power backups.  
Infrastructure  
Various infrastructure components are required to support VoIP. These  
components include switches, routers, and MG 1000S. The data network  
infrastructure’s engineering and provisioning is critical to achieve  
satisfactory telephony voice quality. For more information, see Data  
Networking for Voice over IP (553-3001-160).  
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System architecture  
Page 31 of 44  
Software architecture  
Centralized Automatic Software Upgrade  
Centralized Automatic Software Upgrade allows a new version of software to  
be automatically loaded on the MG 1000S after the Call Server software is  
upgraded. To reduce service impact, a sequential upgrade mode upgrades  
only one MG 1000S at a time.  
Centralized upgrade  
Centralized upgrade enables the IP telephony components (Voice Gateway  
Media Cards) to be upgraded from the Element Manager interface. The  
Element Manager host, the Signaling Server, is a file server for software  
upgrade files for the Voice Gateway Media Cards. IP Phones also  
automatically upgrade from a centralized file location (their TPS).  
Centralized patching  
Centralized patching enables IP telephony components, the Call Server, and  
MG 1000S systems, to be patched from a central location through Element  
Manager.  
File uploading  
File uploading enables software upgrade files and patches to be uploaded to  
the Element Manager host, the Signaling Server, for centralized upgrading or  
centralized patching. The file is uploaded from the management PC (web  
browser) to the Element Manager host (web server).  
Patching implementation  
The Call Server, MG 1000S, Signaling Server, and the Voice Gateway Media  
Cards are patchable. Installing a patch enables a fix to be delivered, without  
requiring a new version of software.  
Communication Server 1000S Overview  
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System architecture  
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44  
Page 33 of 44  
Configuration options  
Contents  
This section contains information on the following topics:  
Introduction  
The IP-distributed architecture of CS 1000S offers the benefits of location  
flexibility for system components. The architecture also provides wiring  
control and simplification of space planning, system management, and  
databases.  
CS 1000S bridges the circuit-switched PBX and the IP network, or it can  
operate in an IP-only network. This consolidation of network traffic  
simplifies the task of managing communication to a single, efficient IP  
network. End users can deploy the CS 1000S in many flexible configurations  
Communication Server 1000S Overview  
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Configuration options  
in a LAN or WAN environment. Although different combinations are  
possible, most installations fall into one of the following categories:  
Single Site  
— single building  
— multiple buildings in a campus  
Multiple Sites  
— central Call Server with branch office users  
— distributed Call Servers  
For more information on system deployment options for the CS 1000S, refer  
to Data Networking for Voice over IP (553-3001-160).  
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Configuration options  
Page 35 of 44  
Single campus deployment  
Figure 3 shows an example of a single campus deployment and its  
components.  
Figure 3  
Single campus deployments example  
Signaling Server  
(Optionally Redundant)  
Call Server  
Rest of World  
PSTN  
Media Gateway  
1000S Expander  
Media Gateway 1000S  
IP Phones  
Campus IP  
Network  
Survivable!  
Survivable!  
Network Management  
802.11  
Survivable!  
Survivable!  
Wireless  
Access Point  
Applications: Nortel Messaging Server 500, Symposium  
553-AAA2130  
Communication Server 1000S Overview  
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Configuration options  
Note: You can configure the network for redundancy.  
The single campus deployment example consists of the following:  
Call Server  
Signaling Server (optionally redundant)  
up to four Media Gateways and four Media Gateway Expanders:  
— can be configured to provide network redundancy  
— provide a global suite of telephony trunks  
analog telephones (service for 2500 series telephones and fax)  
digital telephones (service for Meridian 3900 telephones)  
a switched Ethernet infrastructure  
up to 1000 IP Phones  
centralized management capability  
other telephony applications  
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Configuration options  
Page 37 of 44  
Multiple buildings in a campus  
Figure 4 shows a CS 1000S system distributed across multiple buildings in a  
campus setting. You can distribute MG 1000S systems and users across a  
campus IP Network.  
Figure 4  
Multi-site deployment with centralized call processing  
Campus Distributed  
Media Gateway 1000S  
Central Site  
Optional  
Signaling Server  
Media  
Gateway 1000S  
Call Server  
Signaling Server  
Media Gateway 1000S  
Trunks  
Campus  
Trunks  
IP Network  
(Survivable)  
Client  
Applications  
Client  
553-AAA2131  
In Figure 4, the multi-site deployment with centralized call processing  
consists of the following:  
Call Server at the central site  
Campus distributed MG 1000S  
— optional Signaling Server  
— MG 1000S (survivable)  
— IP Phones configured and managed centrally from the central site  
— Local trunks PSTN and 911 access.  
Communication Server 1000S Overview  
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Configuration options  
Multiple sites  
Figure 5 shows a multi-site deployment with a central Call Server and a  
branch office.  
Figure 5  
Central Call Server with branch office  
Central Office  
Branch Office  
Call Server  
Signaling Server  
Signaling Server  
Media Gateway 1000B  
Nortel Messaging  
Server 500  
Media Gateway  
1000S Expander  
Campus IP  
Network  
Media Gateway 1000S  
Rest of World  
Survivable!  
Campus IP  
Network  
Survivable!  
Client  
Survivable!  
Survivable!  
PSTN  
Rest of World  
553-AAA2132  
The following apply to a multi-site deployment:  
The Call Server at the central site that provides call processing for the  
main and branch offices.  
The multi-site deployment can contain a branch office.  
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Configuration options  
— Requires its own Signaling Server.  
Page 39 of 44  
— MG 1000B in remote branch offices enables local PSTN and 911  
access.  
— IP Phones are configured and managed centrally from the main  
office.  
— The MG 1000B is survivable in the event of a WAN failure.  
— You can configure up to 400 users for survivability.  
— You can use the Signaling Server virtual trunking to the central site  
for system management purposes.  
Routing to and from local branch offices  
IP Phone users can be located at a branch office that is equipped with an  
MG 1000B Core. Call routing to the local MG 1000B Core is important,  
especially if toll charges are applicable to calls from the central Call Server  
controlling the IP Phone. The administrator can configure digit manipulation  
for IP Phones that are located near a branch office, in order to select a branch  
office that provides local PSTN access.  
Calls from the PSTN to users within the network can be routed using either  
(a) the various ESN numbering plan configurations, or (b) the Network  
Number Resolution feature, based upon the Vacant Number Routing feature.  
This enables small sites, such as a branch office, to require minimal  
configuration to route calls through other Call Servers or the Gatekeeper. See  
Branch Office: Installation and Configuration (553-3001-214).  
Communication Server 1000S Overview  
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Configuration options  
Distributed Call Servers  
Distributed Call Servers are defined as multiple CS 1000S systems. Figure 6  
shows an example of multi-site deployment with distributed Call Servers.  
Figure 6  
Distributed Call Servers  
IP Peer Networking  
Call Server  
Signaling Server  
Call Server  
Signaling Server  
Nortel Messaging  
Server 500  
LAN  
IP WAN  
Media Gateway  
Media Gateway 1000S  
1000S Expander  
LAN  
PSTN  
Survivable!  
Survivable!  
Network VIA PRI  
Call Server  
Signaling Server  
Survivable!  
Survivable!  
LAN  
Tie Trunk (T1)  
PSTN  
PSTN  
553-AAA2133  
The multi-site deployment consists of the following peer sites:  
separate Call Servers that provide call processing for each site  
networking supported with IP data network or circuit-switched (analog  
or digital) trunks  
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Configuration options  
Page 41 of 44  
full-featured networking between sites using IP Peer Networking and/or  
TIE trunks  
transparent to user at all sites  
Reliability strategies  
Communication reliability is critical to the operation of any business. A  
number of capabilities are available in CS 1000S to ensure that telephony is  
available when one or more of the following situations occur:  
a hardware component fails  
a software component fails  
the IP network suffers an outage  
The CS 1000S provides several levels of redundancy to ensure that the  
telephony services can withstand single hardware and network failures.  
CS 1000S provides the following component redundancy:  
Call Server with automatic database distribution  
Signaling Server software, including H.323 Gateway and IP Phone  
software  
H.323 Gatekeeper  
H.323 Gateway interface to Gatekeeper  
Campus-distributed MG 1000S in Survival Mode  
You can provision a CS 1000S to provide the following component  
redundancy:  
If the Call Server is unavailable, you can configure MG 1000S systems  
as survivable independent systems (automatic database  
synchronization).  
Note: If the MG 1000S is not configured as survivable, then it is out of  
service until the Call Server is in service again.  
If the Call Server is unavailable, the IP telephony node can re-register  
with one MG 1000S specified as an Alternate Call Server.  
Communication Server 1000S Overview  
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Configuration options  
If the master (Leader) Signaling Server is unavailable, a Follower  
Signaling Server becomes the IP Telephony node master.  
Signaling Servers share telephone registrations (load-sharing).  
If a virtual trunk is unavailable, virtual trunk redundancy occurs (that is,  
the call-processing software selects an alternate route).  
Signaling Servers can be configured for different types of redundancy for  
their software components (for example, Alternate Gatekeeper, Failsafe  
Gatekeeper).  
If the Primary Gatekeeper is unavailable, you can configure an Alternate  
Gatekeeper (automatic database synchronization).  
If the Primary and Alternate Gatekeeper are unavailable, you can  
configure a Failsafe Gatekeeper (at each Signaling Server).  
Figure 7 on page 43 illustrates the handling of a network failure with  
Survivable MG 1000S in place.  
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Configuration options  
Page 43 of 44  
Figure 7  
Network failure with survivable MG 1000S systems  
Call Server  
Signaling Server (optionally redundant)  
-Terminal Proxy Service (TPS)  
-H.323 Gateway Signaling S/W  
WAN  
Media Gateway  
1000B  
1. Call Server Database periodically  
synchronized at Media Gateways  
2. IP Campus Network Fails  
3. Distributed Media Gateway enters  
Survival mode  
4. Voice Gateway Media Card registers  
at Survival Media Gateway Controller Card  
5. Operation resumes at Survivable site using  
local cards only  
6. Primary Call Server continues in normal mode for  
reachable Media Gateways  
Survivable  
Media Gateway  
1000S  
PSTN  
553-AAA2134  
IP telephony node configuration  
An IP telephony node is a grouping of Voice Gateway Media Cards (and  
Signaling Servers), regardless of the location of the Voice Gateway Media  
Cards in the MG 1000S. Therefore, several MG 1000S can belong to the  
same node. Alternately, each MG 1000S can have its own node.  
Each IP telephony node can be configured with the IP address of an Alternate  
Call Server, to which it registers if the Call Server is unavailable.  
Note: The Alternate Call Server is an MG 1000S SSC that is configured  
as survivable.  
Communication Server 1000S Overview  
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Configuration options  
The survivable MG 1000S (Alternate Call Server) IP address must be on the  
same ELAN subnet as the Call Server. If the MG 1000S is on a physically  
different subnet, such as in a different building, then you can use VLANs to  
keep IP addresses on the same logical subnet. For further implementation  
details, refer to Data Networking for Voice over IP (553-3001-160).  
If there are different nodes in different MG 1000S, then the nodes can be  
configured to register to different Alternate Call Servers. This concept is  
desirable for optimizing system reliability to best deal with possible system  
outages. Associate each IP telephony node with an appropriate (for example,  
co-located) Alternate Call Server.  
If the node IDs are configured using the guidelines for the ‘Enhanced  
Redundancy for IP Line Nodes’ feature, then the IP Phones can register (if  
needed) to an alternate node on an MG 1000S Expander. This further  
improves the survivability of the IP Phones by allowing them to register to a  
different node should a system outage occur on their primary node's  
MG 1000S.  
Refer to IP Line: Description, Installation, and Operation (553-3001-365)  
for a description of the Enhanced Redundancy for IP Line Nodes feature.  
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Family Product Manual Contacts Copyright FCC notice Trademarks Document  
number Product release Document release Date Publish  
Nortel Communication Server 1000  
Communication Server 1000S  
Overview  
Copyright © Nortel Networks Limited 2005  
All Rights Reserved  
Information is subject to change without notice.  
Nortel Networks reserves the right to make changes in design  
or components as progress in engineering and manufacturing  
may warrant.  
Nortel, Nortel (Logo), the Globemark, This is the Way, This is  
Nortel (Design mark), SL-1, Meridian 1, and Succession are  
trademarks of Nortel Networks.  
Publication number: 553-3031-010  
Document release: Standard 3.00  
Date: August 2005  
Produced in Canada  
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