Nortel Networks SRG 50, NN43001-307 User Manual

Nortel Communication Server 1000

Main Ofﬁce Conﬁguration Guide for SRG 50

NN43001-307

Document status: Standard Document version: 02.02 Document date: 3 December 2007

Sourced in Canada. The information in this document is subject to change without notice. The statements, conﬁguration, technical

data, and recommendations in this document are believed to be accurate and reliable, but are presented without express or implied warranty. Users must take full responsibility for their applications of any products speciﬁed in this document. The information in this document is proprietary to Nortel Networks.

Nortel, Nortel (Logo), the Globemark, SL-1, Meridian 1, and Succession are trademarks of Nortel Networks. All other trademarks are the property of their respective owners.

Revision history

December 2007

Standard 02.02. This document is up-issued to support CS 1000 Release

5.0 for SRG 50 Release 3.0. This document includes conﬁguration at the main office.

August 2007

Standard 02.01. This document is up-issued to support CS 1000 Release

5.0 for SRG 50 Release 3.0.

June 2007

Standard 01.02. This document is up-issued to remove the Nortel Networks Conﬁdential statement.

May 2007

Standard 01.01. This document is up-issued to support Communication Server 1000 Release 5.0. This document contains information previously contained in the following legacy document, now retired: (553-3001-207). This document is up-issued to include updated information due to CR Q01587820. See "Codec negotiation" (page 95).

SIP Trunks

October 2006

Standard 3.00. This document is up-issued to support SRG 50 Release

2.0 for CS 1000 Release 4.5.

January 2006

Standard 2.00. This document is up-issued for CR Q01202736, with information on reconﬁguring Call Server alarm notiﬁcation levels if necessary when conﬁguring Adaptive Network Bandwidth Management.

August 2005

Standard 1.00. This document is a new document to support Communication Server 1000 Release 4.5.

Nortel Communication Server 1000

Main Ofﬁce Conﬁguration Guide for SRG 50

NN43001-307 02.02 Standard

Release 5.0 3 December 2007

4 Revision history

Nortel Communication Server 1000

Main Ofﬁce Conﬁguration Guide for SRG 50

NN43001-307 02.02 Standard

Release 5.0 3 December 2007

Contents

New in this release 9

Other 9 Subject 9 Intended audiences 9 Related information 9

Description 11

Contents 11 Survivable Remote Gateway 11 Main ofﬁce hardware description 14 Main ofﬁce requirements 17 Optional features to enhance SRG functionality 18 Normal Mode and Local Mode overview 19

Bandwidth Management Overview 24

Capacity 26 Branch ofﬁce dialing plan 27 Branch ofﬁce and SRG 50 terminology 28 Limitations 29

NTPs 10 Online 10 CD-ROM 10

Normal Mode 19

Time of Day 24 SRG IP Phone to local PSTN calls 25 IP Phone to analog (500/2500-type) telephone calls 25

Setting up the main ofﬁce 31

Contents 31 Introduction 31 SRG information required by the main ofﬁce 31 Main ofﬁce information required by the SRG 32 Zone parameters 34 Branch ofﬁce IP Phone conﬁguration at the main ofﬁce 38 SIP IP Trunks conﬁguration at the main ofﬁce 40

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Main Ofﬁce Conﬁguration Guide for SRG 50

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6 Contents

Dialing Plan conﬁguration 43

Contents 43 Overview 43 On-net dialing plan 43 Off-net dialing plan 45 Routing calls 45 SIP/H.323 zones 45 Zone-based digit manipulation 46 Conﬁguring the dialing plan for PSTN access to SRG users in Normal Mode 48 Dialing plan examples 65

Bandwidth Management 95

Contents 95 Introduction 95 Codec negotiation 95 Conﬁguring Bandwidth Management parameters 101 Adaptive Network Bandwidth Management 110 Tandem Bandwidth Management overview 129 Dialing Plan Overview 130 Network using Uniform Dialing Plan 132 Network using Coordinated Dialing Plan 154

Alternative Call Routing for Network Bandwidth Management159

Contents 159 Description 159 Operating parameters 174 Feature interactions 175 Feature packaging 176 Feature implementation using Command Line Interface 176 Feature implementation using Element Manager 178 Diagnostics 180 Maintenance 184 Feature operation 187

Emergency Services conﬁguration 189

Contents 189 Overview 189 Emergency Services Access 190 Emergency Services for Virtual Ofﬁce 200 On-Site Notiﬁcation 201 Conﬁguring the NRS for ESA SPN 201 Testing the ESDN number 202 Conﬁguring ESA using Element Manager 202 Emergency Service using Special Numbers (SPN) 202

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Contents 7

Enhanced UNIStim Firmware Download 205

Contents 205 Description 205 Firmware upgrade 206

Appendix A Media Redirection Scenarios 209 List of terms 213 Index 218 Procedures

Procedure 1 Conﬁguring ESN and SRG zones 34 Procedure 2 Conﬁguring branch ofﬁce IP Phones at the main ofﬁce using

LD 11 39 Procedure Conﬁguring SIP IP Trunks 40 Procedure 3 Conﬁguring the main ofﬁce 49 Procedure 4 Conﬁguring the NRS database 57 Procedure 5 Conﬁguring the branch ofﬁce 60 Procedure 6 Testing PSTN access using an SRG IP Phone 64 Procedure 7 Printing intrazone and interzone statistics for a zone 106 Procedure 8 Displaying CAC parameters for one or more zones 124 Procedure 9 Provisioning Tandem Bandwidth Management 145 Procedure 10 Accessing the Zones web page 178 Procedure 11 Printing zone ALTPreﬁx 181 Procedure 12 Show Status 183 Procedure 13 Enabling behavior at a zone 185 Procedure 14 Suppress Alternative Call Routing for NBWM alarms 187 Procedure 15 Conﬁguring the main ofﬁce 195 Procedure 16 Conﬁguring the branch ofﬁce zone 200 Procedure 17 Testing ESDN using an SRG telephone 202 Procedure 18 Upgrading ﬁrmware 207

Nortel Communication Server 1000

Main Ofﬁce Conﬁguration Guide for SRG 50

NN43001-307 02.02 Standard

Release 5.0 3 December 2007

8 Contents

Nortel Communication Server 1000

Main Ofﬁce Conﬁguration Guide for SRG 50

NN43001-307 02.02 Standard

Release 5.0 3 December 2007

New in this release

The CS 1000 Main Ofﬁce Conﬁguration for SRG50 (NN43001-307) for CS 1000 Release 5.0 includes support for SRG 50 Release 3.0.

The following sections detail what is new in CS 1000 Main Ofﬁce Conﬁguration for SRG50 (NN43001-307) for CS 1000 Release 5.0 .

Other

CS 1000 Main Ofﬁce Conﬁguration for SRG50 (NN43001-307) includes the following changes:

•

Replaced instances of OTM 2.2 with TM 3.1.

•

Updated Element Manager with enhancements.

•

Added support for new IP Phones.

•

Removed instances of CS 1000S and Small Systems.

•

Removed instances of Terminal Numbers (TN) in "c u" format. Only TN in "l s c u" format are supported.

Subject

This document describes the CS 1000 Main Ofﬁce Conﬁguration for SRG50 (NN43001-307) for software Release 3.0 for CS 1000 Release 5.0.

Information in this document complements information found in documents in the Communication Server 1000 documentation suite. For information about how to conﬁgure the SRG 50, see SRG50 Conﬁguration Guide (NN40140-500) at w Documentation > Communication Servers > BCM.

Intended audiences

This document is intended for individuals responsible for conﬁguring the main ofﬁce for Survivable Remote Gateway for organizations using CS 1000 systems.

Related information

This section lists information sources that relate to this document.

ww.nortel.com. Select Support & Training > Technical

Nortel Communication Server 1000

Main Ofﬁce Conﬁguration Guide for SRG 50

NN43001-307 02.02 Standard

Release 5.0 3 December 2007

10 New in this release

NTPs

The following NTPs are referenced in this document:

•

• IP Line Fundamentals (NN43100-500)

•

Converging the Data Network with VoIP (NN43001-260) Electronic Switched Network Reference—Signaling and Transmission

(NN43001-280) Dialing Plans Reference (NN43001-283) Signaling Server Installation and Commissioning (NN43001-312) IP Peer Networking Installation and Commissioning (NN43001-313) Branch Ofﬁce Installation and Commissioning (NN43001-314) Telephony Manager 3.1 System Administration (NN43050-601) Software Input Output Administration (NN43001-611) Emergency Services Access Fundamentals (NN43001-613) Element Manager System Reference Administration (NN43001-632)

ISDN Primary Rate Interface Fundamentals (NN43001-569)

Online

CD-ROM

•

Basic Network Feature Fundamentals (NN43001-579)

• Communication Server 1000M and Meridian 1 Small System Planning

and Engineering (NN43011-220)

•

Communication Server 1000M and Meridian 1 Large System Planning and Engineering (NN43021-220)

•

CommunicationServer 1000E Planning and Engineering (NN43041-220)

•

Software Input Output Reference—Maintenance (NN43001-711)

•

SRG50 Conﬁguration Guide (NN40140-500)

To access Nortel documentation online, click the Technical Documentation link under Support & Training on the Nortel home page:

ww.nortel.com

To obtain Nortel documentation on CD-ROM, contact your Nortel customer representative.

Nortel Communication Server 1000

Main Ofﬁce Conﬁguration Guide for SRG 50

NN43001-307 02.02 Standard

Release 5.0 3 December 2007

Description

This section contains information about the following topics:

•

"Survivable Remote Gateway" (page 11)

•

"Main ofﬁce hardware description" (page 14)

•

"Main ofﬁce requirements" (page 17)

•

"Optional features to enhance SRG functionality" (page 18)

•

"Normal Mode and Local Mode overview" (page 19)

•

"Capacity" (page 26)

•

"Branch ofﬁce dialing plan" (page 27)

•

"Branch ofﬁce and SRG 50 terminology" (page 28)

Survivable Remote Gateway

The Survivable Remote Gateway (SRG) extends the desktop feature and user interface of the CS 1000 to remote IP branch ofﬁce users and gives them full access to the same applications as the main site. CallPilot, Contact Center Management Server (CCMS), and other central applications are shared by remote users to deliver state-of-the-art features and functionality to small remote ofﬁces.

SRG 50 Release 2.0 provides the following:

•

extends the supported number of survivable IP users from 32 to 80

•

extends support for the IP Phone 1120E, IP Phone 1140E, IP Audio Conference Phone 2033, and WLAN 2212

See "Supported IP Phones" (page 16) for a complete list of supported IP Phones.

•

supports H.323 and SIP Trunking to the CS 1000 main ofﬁce

•

supports analog devices, such as fax machines and terminals but are limited in number and limited to basic access

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12 Description

SRG 50 Release 3.0 provides the following:

•

extends support for the IP Phone 1110 See "Supported IP Phones" (page 16) for a complete list of supported

IP Phones.

•

evolves the SIP trunk to support a standard SIP Trunk interface

•

supports On-site Notiﬁcation

Table 1 Supported software at the branch ofﬁce

IP branch office solution

SRG 1.0

SRG 50 Release 1.0

SRG200/400 Release

1.5

SRG 50 Release 2.0

Survivable users

up to 90

up to 32

up to 90

up to 80

Server support

Succession 3.0 CS 1000 Release 4.0 CS 1000 Release 4.5

Succession 3.0 CS 1000 Release 4.0 CS 1000 Release 4.5 CS 1000 Release 5.0

Feature description

VoIP and Application Gateway Local Mode = Basic telephony features

VoIP and Application Gateway Local Mode = Basic telephony features A more cost effective small branch office solution. Provides H.323 trunking. For more information, see CS

1000 Main Office Configuration Guide for SRG 50 (553-3001-207).

VoIP and Application Gateway Local Mode = Basic telephony features Feature Parity with SRG 50, new OS, and extended IP Phone support. Provides H.323 trunking. For more information, see Main

Office Configuration Guide for SRG 200/400 Release 1.5 (NN43001-308).

VoIP and Application Gateway Local Mode = Basic telephony features Extends IP Phone support and survivable IP users from 32 to 80. Provides H.323 and SIP trunking. For more information, see CS

1000 Main Office Configuration Guide for SRG 50 (553-3001-207).

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Survivable Remote Gateway 13

IP branch office solution

SRG 50 Release 3.0

MG 1000B

MG 1000E

The SRG is implemented on a BCM 50 platform and is connected to a CS 1000 at the main ofﬁce through Virtual Trunks over a reliable IP WANaccess facility. This conﬁguration allows the call processing for the IP Phones at the SRG site to be centralized at the main ofﬁce. The Call Server at the main ofﬁce provides the call processing for the IP Phones registered to both the main ofﬁce and branch ofﬁces. The SRG provides call processing functionality to phones in local mode and local analog devices. The SRG supports business continuity and call failover through digital and analog trunk access to the local Public Switched Telephone Network (PSTN).

Survivable users

up to 80

up to 400

Server support

CS 1000 Release 5.0

Succession 3.0 CS 1000 Release 4.0 CS 1000 Release 4.5 CS 1000 Release 5.0

CS 1000 Release 5.0

Feature description

VoIP and Application Gateway Local Mode = Basic telephony features Extends IP Phone support to include the IP Phone 1110. Supports On Site Notification for E-911 calls. Provides H.323 and SIP trunking.

100% CS 1000 feature and application redundancy in survivable mode. Designed and positioned for larger IP branch offices. Provides H.323 and SIP trunking.

Provides survivability with the addition of Call Processor Pentium Mobile (CP PM).

In order for devices in the CS 1000 network to access analog devices at the SRG or to access the PSTN at the SRG, virtual trunks are used over the LAN/WAN.

If the main ofﬁce fails to function, or if there is a network/WAN outage, the SRG automatically switches to Local mode and provides basic telephony service to the phones located at the branch ofﬁce. This enables the IP Phones to survive the outage between the branch ofﬁce and the main ofﬁce.

To ensure proper operation of the SRG solution it must be conﬁgured to support a common dialing plan with the CS 1000 main ofﬁce. Any other conﬁguration is not guaranteed to work reliably. Since the Call Server and the SRG handle dialing slightly differently, ensure that any settings you use for the main ofﬁce that need to interact with the SRG, can be accommodated by the SRG call processing.

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Main Ofﬁce Conﬁguration Guide for SRG 50

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Release 5.0 3 December 2007

14 Description

Figure 1 "SRG network" (page 14) shows the networking among the main

ofﬁce, SRG, and IP Phones.

Figure 1 SRG network

Main ofﬁce hardware description

The main ofﬁce must be one of the following systems:

•

CS 1000E

•

CS 1000M Cabinet

•

CS 1000M Chassis

•

CS 1000M HG

•

CS 1000M SG

•

CS 1000M MG

Throughout this document, references to CS 1000 systems encompass all CS 1000 system types.

The diagrams throughout this documentation show a CS 1000E main ofﬁce. All of the systems appearing in the list perform identical main ofﬁce functions as far as the SRG is concerned. For information about the SRG, see SRG50 Conﬁguration Guide (NN40140-500).

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Main Ofﬁce Conﬁguration Guide for SRG 50

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Signaling Server

The following Signaling Servers are available for CS 1000 Release 5.0 :

•

ISP1100

•

HP-DL320-G4

•

IBM-X306m

•

Common Processor Pentium Mobile (CP PM)

The Signaling Server is required at the main ofﬁce only. It provides the following functions:

•

Terminal Proxy Server (TPS) The TPS provides a connection from the IP Phones to the Call Server

and a connection from a Virtual Trunk to the Call Server.

•

H.323 Gateway (Virtual Trunk)

•

SIP Gateway (Virtual Trunk)

•

CS 1000 Element Manager Web Server and Network Routing Service (NRS)

Main ofﬁce hardware description 15

•

NRS, consisting of: — SIP Redirect Server NRS — H.323 Gatekeeper — Network Connection Service (NCS)

•

Personal Directory

A second Signaling Server can be used to provide redundancy in the case of a failure in the primary Signaling Server at the main ofﬁce.

A similar function to the Signaling Server is used at the SRG when the phones are in local mode.

The Signaling Server supports en bloc signaling which is standard on the Signaling Server.

For more information about the Signaling Server, see Signaling Server Installation and Commissioning (NN43001-312). For more information about H.323 and overlap signaling, see IP Peer Networking Installation and Commissioning (NN43001-313).

Network Routing Services

•

The Network Routing Service (NRS) application provides network-based routing, combining the following into a single application:

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Main Ofﬁce Conﬁguration Guide for SRG 50

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Release 5.0 3 December 2007

16 Description

•

H.323 Gatekeeper— provides central dialing plan management and

routing for H.323-based endpoints and gateways.

•

SIP Redirect Server NRS — provides central dialing plan management

and routing for SIP-based endpoints and gateways. SIP Trunks are used for Voice packet trafﬁc alone.

• NRS Database— stores the central dialing plan in XML format for the

H.323 Gatekeeper, and the SIP Redirect Server. The H.323 Gatekeeper and the SIP Redirect Server accesses this common endpoint and gateway database.

•

Network Connect Server (NCS) — used only for Media Gateway

Controller (MGC) based MG 1000B, SRG, Geographic Redundancy, and Network-wide Virtual Ofﬁce solutions. The NCS allows the Line TPS (LTPS) to query the NRS.

•

NRS Manager web interface— the NRS provides its own web interface

to conﬁgure the H.323 Gatekeeper, SIP Redirect Server, and the NCS.

The NRS application provides routing services to H.323 devices and SIP-compliant devices. The H.323 Gatekeeper can be conﬁgured to support H.323 routing services, while the SIP Redirect Server NRS can be conﬁgured to support SIP routing services. The H.323 Gatekeeper and the SIP Redirect Server NRS 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.

When conﬁguring the NRS it is necessary to enable the NCS. Ensure that the check box “Network Connection Server enabled” is checked in the NRS conﬁguration window of CS 1000 Element Manager.

For information about conﬁguring the NRS, see IP Peer Networking Installation and Commissioning (NN43001-313).

Supported IP Phones

Table 2 "IP Phone support " (page 16) shows the supported IP Phones

for each software release.

Table 2 IP Phone support

IP Phone Release 1.0 Release 2.0 Release 3.0

IP Phone 2001 Supported Supported Supported

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Main Ofﬁce Conﬁguration Guide for SRG 50

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Main ofﬁce requirements 17

IP Phone 2002 Supported Supported Supported IP Phone 2004 Supported Supported Supported IP Phone 2007 Supported Supported Supported IP Audio Conference Phone 2033 Supported Supported Supported IP Softphone 2050 Supported Supported Supported IP Phone 1110 Not supported Not supported Supported IP Phone 1120E Not supported Supported Supported IP Phone 1140E Not supported Supported Supported IP Phone 1150E Not supported Not supported Not supported Mobile Voice Client (MVC) 2050 Supported Supported Supported Analog (500/2500-type) telephones Supported Supported Supported WLAN Handset 2210 Supported Supported Supported WLAN Handset 2211 Supported Supported Supported WLAN Handset 2212 Not supported Supported Supported WLAN Handset 6120 Not supported Not supported Not supported WLAN Handset 6140 Not supported Not supported Not supported

Throughout this document, the IP Phones are referred to collectively as IP Phones.

Main ofﬁce requirements

The branch ofﬁce running SRG Release 3.0 requires the following at the main ofﬁce:

•

CS 1000 hardware, running CS 1000 Release 4.0, CS 1000 Release

4.5, orCS 1000 Release 5.0 .

•

Conﬁgure at least one of the following packages for IP Peer Networking: — H.323 Virtual Trunk (H323_VTRK) package 399 — SIP Gateway and Converged Desktop Package (SIP) package 406

•

The main ofﬁce must have a software Service Level of 2 or higher to work with the branch ofﬁce.

•

Ensure that you have ordered enough IP user and Virtual Trunk licenses at the main ofﬁce to support the SRG 50 or the capacity of your branch ofﬁce.

The two different IP user licenses at the main ofﬁce are: — Basic IP License for the IP Phone 2001, IP Audio Conference Phone

2033, and IP Phone 1110

Nortel Communication Server 1000

Main Ofﬁce Conﬁguration Guide for SRG 50

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Release 5.0 3 December 2007

18 Description

— IP User License for the IP Phone 2002, IP Phone 2004, IP Phone

2007, IP Phone 1120E, IP Phone 1140E, IP Softphone 2050, Mobile Voice Client (MVC) 2050, WLAN Handset 2210, WLAN Handset 2211, and WLAN Handset 2212

The main ofﬁce requires the following software packages to support the speciﬁed Basic Network features. See Basic Network Feature Fundamentals (NN43001-579) for more information about these features.

•

Network Call Back Queuing (MCBQ) package 38. This package is required for SRG IP Phones to invoke any queuing feature or ringback when free.

•

Network Speed Call (NSC) package 39. This package is required for SRG IP Phones to invoke the Network Speed Call feature.

The main ofﬁce requires the following software packages to support the speciﬁed ISDN Primary Rate Interface features. See ISDN Primary Rate Interface Fundamentals (NN43001-569) for more information about these features.

•

Network Attendant Service (NAS) package 159. This package is required for analog (500/2500-type) telephones in the branch ofﬁce to access attendant services when the attendant is conﬁgured on the main ofﬁce.

•

Network Message Services (NMS) package 175. This package is required for analog (500/2500-type) telephones in the branch ofﬁce to share the voice mail system in the main ofﬁce. For any conﬁgurations using centralized CallPilot on the main ofﬁce with one or more branch ofﬁces in separate time zones, the NMS package is required at the main ofﬁce for the branch IP Phones.

Optional features to enhance SRG functionality

•

Network Alternate Route Selection (NARS) package 58. See Basic Network Feature Fundamentals (NN43001-579).

•

Overlap Signaling (OVLP) package 184. This package is optional; it is required for overlap signaling. It is packaged with H.323 Virtual Trunk (H323_VTRK) package 399.

•

Emergency Services Access (ESA) package 329. This package is optional; it is required only to receive 911/ESA features in North American and some Caribbean and Latin American (CALA) markets. See Emergency Services Access Fundamentals (NN43001-613).

•

Virtual Ofﬁce (VIRTUAL_OFFICE) package 382. This package is optional; it is required only for Virtual Ofﬁce functionality.

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Normal Mode and Local Mode overview 19

•

Network Signaling (NSIG) package 37. This package is optional for SRG IP Phones to access set-based Network Class of Service (NCOS) features.

•

Adaptive Network Bandwidth Management package 407.

• Alternative Call Routing for Network Bandwidth Management. Forsoftware and hardware requirements for SRG, see SRG50 Conﬁguration

Guide (NN40140-500).

Normal Mode and Local Mode overview

Normal Mode and Local Mode overview provides a description of the following sections:

•

Normal Mode

•

Local Mode

•

Survivability

•

Recovery to Normal Mode

• Local Mode operation

•

Virtual trunks

Normal Mode

IP Phones that are physically located at the SRG but are registered with the main ofﬁce are operating in Normal Mode. In Normal Mode, the main ofﬁce provides centralized call processing to all applications transparently to all IP Phones at the Branch Ofﬁce. All IP Phones at the Branch, in Normal Mode, are registered to the main ofﬁce TPS and are controlled by the Call Server at the main ofﬁce.

Users of the SRG IP Phones receive the features, applications, key layout, and tones of the main ofﬁce Call Server. This provides feature and application transparency between the branch ofﬁce and the main ofﬁce.

Local Mode

Users at the branch ofﬁce may be in Local Mode, or survivable mode for two different reasons:

1. IP Phone has just booted up.

2. IP Phone cannot communicate to the main ofﬁce because of a WAN

failure or a failure of the main ofﬁce components.

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20 Description

ATTENTION

When a telephone or trunk in the main ofﬁce calls an SRG IP Phone that has switched to Local Mode due to WAN failure, the call is treated according to the main ofﬁce call redirection conﬁguration (such as forwarding to voice mail or continuous ringback).

In the event that the IP Phones at the branch ofﬁce lose the connection to the main ofﬁce CS 1000 call server for any reason (WAN failure, main ofﬁce call server failure, main ofﬁce Signaling Server failure), the SRG 50 reverts to Local Mode automatically. Essentially, when VoIP connectivity is lost, each IP Phone loses its Reliable UDP (RUDP) connection with the main ofﬁce Terminal Proxy Server (TPS). The IP Phones at the branch ofﬁce reboot and reregister to the SRG 50, placing them in Local Mode.

After this occurs, the IP Phones displays an indication on the display area that the set is in Local Mode of operation. This display is conﬁgurable by installers to meet local language and usage norms.

In Local Mode, the IP users connected at the branch ofﬁce are under the control of the SRG 50 call services. As such, the normal main ofﬁce call server features are not available. The SRG 50 offers a basic feature set when in Local Mode which allows IP Phones to continue to make and receive calls internally within the branch ofﬁce and over the provisioned local PSTN interfaces. Basic services, such as transfer, last number redial, and single key access through the PSTN to a centralized voice messaging system are supported. Local PSTN access and local Emergency Services access is also supported. No local applications or Business Communication Manager features are supported in Local Mode operation.

Analog devices continue to be under the control of the SRG 50 system. It is the intent of Local Mode to provide continued access to the PSTN for critical calls and emergency services.

In Local Mode, since the SRG 50 handles all call processing, calls between two IP phones at the SRG 50 are handled locally as a simple station-to-station call. When an IP Phone initiates a local PSTN call, the SRG 50 routes the call to a trunk that is connected to the local PSTN. Incoming DID calls are also handled by the SRG 50 and terminated on the appropriate IP Phone.

In the event of a WAN failure, in Local Mode, the IP Phones do not have access to the main ofﬁce network over the VoIP trunks. If the appropriate alternate routes are conﬁgured, calls will be routed to the main ofﬁce or other branch ofﬁces using the available PSTN trunks.

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Main Ofﬁce Conﬁguration Guide for SRG 50

NN43001-307 02.02 Standard

Release 5.0 3 December 2007

Normal Mode and Local Mode overview 21

While in Local Mode, the SRG 50 system continues to monitor for a main ofﬁce CS 1000 heartbeat signal, and once detected, automatically redirects phones on an individual basis back to Normal Mode of operation. If a call is active, the SRG waits until the call is completed before redirecting the phones; calls in progress are not interrupted. This switch-over occurs almost immediately once the SRG determines that an individual phone can be redirected. This reinstates the CS 1000 normal user interface and feature set for the IP Phone user, on a user by user basis.

The SRG 50 system implements the same interface used by the MG 1000B system to interact with the main ofﬁce CS 1000 system. This allows the main ofﬁce to identify attached clients and the local PSTN as branch ofﬁce entities, enabling proper operation of dial plans and E911 access.

In Local Mode, devices that are physically located at the branch ofﬁce, that are controlled by the local system and receive a basic telephony feature set, provide business continuity for the branch ofﬁce during the WAN or system failure. The SRG supports a main ofﬁce heartbeat or reliable UDP signaling which automatically reregisters users once WAN or system failure has recovered.

For information about the features supported in Local Mode, see SRG50 Conﬁguration Guide (NN40140-500).

Survivability

SRG is speciﬁcally designed to provide automatic survivability against WAN failure, main ofﬁce Call Server failure, main ofﬁce Signaling Server failure, and Gatekeeper failure.

SRG supports the Geographic Redundancy feature. For further information about Geographic Redundancy, see System Redundancy Fundamentals (NN43001-507).

In the event of a WAN failure, the SRG IP Phones lose communication with the main ofﬁce. This causes the SRG IP Phones to reset and register with the SRG. The IP Phones then operate in Local Mode, providing basic telephony services delivered by the local SRG system. For further information about services and features supported on the SRG, see SRG50 Conﬁguration Guide (NN40140-500).

If the main ofﬁce Call Server fails and call processing services are provided by an Alternate Call Server, the SRG IP Phones reset and reregister with the Alternate Call Server and receive call processing services from it. If no Alternate Call Server is available, the SRG IP Phones go to Local Mode while the SRG attempts to ﬁnd an Alternate Call Server by way of the NCS.

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22 Description

If the main ofﬁce Signaling Server fails and an Alternate Signaling Server is available, the SRG IP Phones reset and reregister with the SRG. The SRG will then query the NCS for the Alternate Signaling Server IP address. The SRG will redirect the IP Phone to the Alternate Signaling Server and continue to receive call processing services from the main ofﬁce Call Server. If no Alternate Signaling Server is available, the SRG IP Phones reset and register with the SRG in Local Mode.

When an IP Phone at the SRG ﬁrst boots up, the IP Phone attempts to communicate with the SRG. After communication with the SRG is established, the SRG redirects the IP Phone to the main ofﬁce. When the SRG IP Phone attempts to register with the main ofﬁce, the SRG ﬁrst queries the Primary NCS for the main ofﬁce Virtual Trunk node IP address to redirect the IP Phone. If the Primary NCS is down or unreachable, the SRG queries the Alternate NRS (H.323 Gatekeeper/SIP Redirect Server), if one is speciﬁed. If it receives a positive response, the SRG IP Phone is redirected to the speciﬁed main ofﬁce. Otherwise, if neither a Primary or an Alternate NRS (H.323 Gatekeeper/SIP Redirect Server) is available, the SRG IP Phone remains in Local Mode, and receives call processing services from the SRG until communication can be reestablished.

SRG IP Phones in Normal Mode remain registered with the main ofﬁce if the Primary NCS fails and no Alternate NCS is available. They can call any main ofﬁce telephone or IP Phones in Normal Mode in other branch ofﬁces. However, they cannot call any SRG analog (500/2500-type) telephones or any external numbers through the SRG trunks because an H.323 Gatekeeper/SIP proxy server, which could route call properly in case of an NRS failure, is not available.

Recovery to Normal Mode

After communication is reestablished with the main ofﬁce call server, all IP Phones at the branch ofﬁce that are in Local Mode automatically redirect and reregister to the main ofﬁce and return to Normal Mode operation. IP Phones that were busy at the time communication was reestablished complete the call in Local Mode, and then reregister with the main ofﬁce after the call is complete.

Local Mode operation

When an SRG IP Phone is in Local Mode, the user has full access to the services conﬁgured at the SRG (analog devices or analog or digital trunks) and to other IP Phones registered to the SRG. In Local Mode, the IP Phones can make local calls to other IP Phones and other analog (500/2500-type) telephones at the branch ofﬁce. They can also be used to make outgoing PSTN calls and receive incoming calls as usual. SRG IP Phones can access the main ofﬁce IP Phones or other branches by routing through the local PSTN.

Nortel Communication Server 1000

Main Ofﬁce Conﬁguration Guide for SRG 50

NN43001-307 02.02 Standard

Release 5.0 3 December 2007

Testing the phone in Local Mode

From Normal Mode, the branch user has the option of going to Local Mode manually using the Test Local Mode feature, or when the telephone is power-cycled. The test can be performed by the user at any time and does not require a password. This test is invoked from any IP Phone at the branch ofﬁce.

Nortel recommends testing Local Mode operation after changing the provisioning for a telephone on the SRG.

To ensure that users do not forget to resume Normal Mode operation, the SRG redirects the telephone to the main ofﬁce to return the telephone to Normal mode. This occurs if the telephone remains registered to the SRG in Test Local Mode for ten minutes (default setting). Alternatively, the user can press the Quit key on the phone to return to Normal Mode.

For further information about Local Mode functionality for SRG, see SRG50 Conﬁguration Guide (NN40140-500).

Virtual Trunks

In order for endpoints in the CS 1000 network to access endpoints in local mode at the SRG or to access the PSTN at the SRG, Virtual Trunks are used over the LAN/WAN.

Normal Mode and Local Mode overview 23

Virtual Trunks are software components that provide the trunking features of the Meridian Customer-Deﬁned Network (MCDN) feature set. Access to PSTN digital or analog trunks at the branch ofﬁce occurs through the MCDN Virtual Trunk.

Virtual Trunks are sometimes referred to as SIP or H.323 Virtual Trunks. In the SRG50 Conﬁguration Guide (NN40140-500), Virtual Trunks are referred to as IP Trunks.

For more information about Virtual Trunks, see IP Peer Networking Installation and Commissioning (NN43001-313).

IP Phone calls

When an IP Phone calls another IP Phone, each telephone receives the address of the other to exchange media directly between the telephones. When in Normal Mode, an SRG IP Phone calling a main ofﬁce IP Phone does not require any trunking to set up the call. However, LAN/WAN bandwidth is used to provide a media path for the call. For more information on Direct IP media path functionality, see IP Peer Networking Installation and Commissioning (NN43001-313).

Nortel Communication Server 1000

Main Ofﬁce Conﬁguration Guide for SRG 50

NN43001-307 02.02 Standard

Release 5.0 3 December 2007

24 Description

Bandwidth Management Overview

For a complete overview of Bandwidth Management, see the Converging the Data Network with VoIP (NN43001-260) and for details on conﬁguration,

see "Bandwidth Management" (page 95).

Network Bandwidth Management

Network Bandwidth Management allows for a limit to be placed on the amount of interzone bandwidth allowed between IP Phones in Normal Mode at the SRG and the rest of the CS 1000 network.

As well, it allows for the selection of interzone bandwidth codecs for calls between the IP Phones in Normal Mode and the rest of the CS 1000 network.

Adaptive Network Bandwidth Management

Adaptive Network Bandwidth Management allows the system to dynamically react to Quality of Service (QoS) degradation and take corrective action.

Network Bandwidth Management Zones

A zone is a collection of IP Phones that:

•

share similar IP bandwidth restrictions

•

are geographically close to one another

•

are all in the same time zone

•

are all in the same PSTN dialing plan

The Network Bandwidth Management Zone is made up of the VPNI and the zone. The VPNI of the main ofﬁce and all the SRG associated with it must be the same.

Each SRG must have its own unique zone number and conﬁgured in the main ofﬁce Call Server and the SRG.

Throughout this document, the term zone is deﬁned as a Bandwidth Management Zone, not an NRS (H.323 Gatekeeper) Zone. See "Bandwidth Management"

(page 95).

Time of Day

Because the SRG IP Phones, in Normal Mode, receive their clock information from the main ofﬁce, which may be located in a different time zone, the main ofﬁce must be able to provide a different time of day for these phones.

ATTENTION

Nortel Communication Server 1000

Main Ofﬁce Conﬁguration Guide for SRG 50

NN43001-307 02.02 Standard

Release 5.0 3 December 2007

The time zone of the SRG is conﬁgured with the SRG zone at the main ofﬁce. The time zone adjusts the main ofﬁce time for display at the SRG. SRG phones then display the correct time of the SRG, rather than that of the main ofﬁce. For any conﬁgurations using centralized Call Pilot on the main ofﬁce with one or more branch ofﬁces in separate time zones, the NMS package is required at the main ofﬁce for the branch IP Phones.

SRG IP Phone to local PSTN calls

When an SRG IP Phone in Normal Mode dials a local PSTN number, the call is processed by the main ofﬁce Call Server. The dialed digits are modiﬁed according to the dialing plan information conﬁgured in the zone for the SRG IP Phone.

The call is conﬁgured to be routed over the Virtual Trunk to the branch ofﬁce. The SRG then tandems the call to the local PSTN. Likewise, long distance calls can also be conﬁgured.

If you use one Access Code for both local and long distance calls, and that Access Code is associated with a branch ofﬁce zone, all calls (local and long distance) are routed through the SRG

Bandwidth Management Overview 25

IP Phone to analog (500/2500-type) telephone calls

When an IP Phone in Normal Mode at the SRG calls an analog (500/2500-type) telephone of the same SRG, the call is processed at the main ofﬁce Call Server. A Virtual Trunk route is selected according to the digits dialed. The call is routed over a Virtual Trunk to the branch ofﬁce. The SRG processes the incoming Virtual Trunk call and terminates it to the local analog (500/2500-type) telephone. Since this is a call between IP and circuit-switched devices, a DSP resource on a Media Card is allocated and connected to the analog (500/2500-type) telephone. The IP address of the DSP resource is returned to the main ofﬁce Call Server so a direct media path between the IP Phone and the DSP resource can be set up when the call is established. See IP Peer Networking Installation and Commissioning (NN43001-313) for details.

Conference calls

When an SRG user initiates a conference call, the conference facilities of the main ofﬁce are used. This means that in a conference among three SRG users, the LAN/WAN bandwidth of three media paths is used. The calls are controlled by the main ofﬁce, except in Local Mode. In Local Mode, SRG users do not have access to conferencing.

Networking consideration

A fault condition can occur if IP Phones use a different route to the main ofﬁce than that used by the SRG.

Nortel Communication Server 1000

Main Ofﬁce Conﬁguration Guide for SRG 50

NN43001-307 02.02 Standard

Release 5.0 3 December 2007

26 Description

Capacity

CAUTION

Service Interruption

If the network is planned so that IP Phones use a different route to the main ofﬁce than that used by the SRG, a fault condition can occur. When the SRG can reach the main ofﬁce but the IP Phone cannot ping the main ofﬁce due to a network outage, an IP Phone registration can force the telephone into a cycle of registering locally, being redirected to the main ofﬁce, rebooting, and then registering locally again. When this cycle occurs, further diagnose the network outage.

Each CS 1000 main ofﬁce can support up to 255 branch ofﬁces, which can be made up of any combination SRG and MGC based MG 1000B. SRG 50 Release 2.0 and later supports up to 80 survivable IP users. However, since all IP Phones register with the main ofﬁce, the governing factor is the maximum number of IP Phones that can be supported at the main ofﬁce. This means the total number of IP Phones in all ofﬁces can be no greater than the capacity of the main ofﬁce. See one of the following documents to determine the total number of phones your system can support:

•

CommunicationServer 1000E Planning and Engineering (NN43041-220)

• Communication Server 1000M and Meridian 1 Large System Planning

and Engineering (NN43021-220)

Virtual Trunks capacity

The SRG capacity to support a number of simultaneous calls depends on the speciﬁc codec type used and the available bandwidth.

If both the intrazone and interzone codes are conﬁgured as Best Quality (G.711), the SRG supports up to 24 Virtual Trunks (H.323 or SIP), otherwise, only 15 Virtual Trunks (H.323 or SIP) are supported.

In Normal Mode, the codec selection used is controlled by speciﬁc programming of the CS 1000.

In Local Mode, if the WAN has failed, Virtual Trunks between the SRG and CS 1000 cannot be established. However, the SRG will continue to convert calls from IP terminals for communication through the PSTN. Nortel recommends you use G.711 codec.

Nortel Communication Server 1000

Main Ofﬁce Conﬁguration Guide for SRG 50

NN43001-307 02.02 Standard

Release 5.0 3 December 2007

Branch ofﬁce dialing plan

Since IP Phone users can be located at a branch ofﬁce equipped with an SRG, the routing of calls to the local gateway is important (especially when toll charges apply to calls made from the central Call Server that controls the telephone). The administrator can conﬁgure digit manipulation through zone attributes for IP Phones to select a main ofﬁce or branch ofﬁce that provides PSTN access local to the destination of the call.

Calls from the PSTN to users within the network can be routed with the various ESN numbering plan conﬁgurations.

To access local PSTN resources, outgoing calls can be routed using ESN as well as zone parameters that enable digit insertion. The zone parameters force calls made by an SRG user to be routed to the desired local PSTN facilities.

Outgoing calls can include local and, optionally, long distance calls.

Branch ofﬁce dialing plan 27

ATTENTION

Nortel recommends that the Branch User ID (BUID) be the same at the branch ofﬁce as the DN at the main ofﬁce. A BUID has a maximum of 15 digits. Under the recommended Coordinated Dialing Plan (CDP), the BUID can be an extension (for example, 4567). Under the Uniform Dialing Plan (UDP), the BUID is the user main ofﬁce DN, the Location Code (LOC), plus the Access Code (for example, 6 343-5555). The main ofﬁce DN must be an ESN compliant DN. See "ESN Access Codes" (page 27).

The SRG only supports only one dialing plan option at a time. CDP and UDP dialing plan options cannot be conﬁgured at the same time in the same system.

For more information about dialing plans and conﬁguration, see "Dialing

Plan conﬁguration" (page 43). For more information about the branch

ofﬁce dialing plan, see CS 1000 Main Ofﬁce Conﬁguration for SRG50

(NN43001-307).

ESN Access Codes

ESN data is conﬁgured with two Access Codes, called AC1 and AC2. AC1 normally applies to long distance calls, whether placed on or off the customer’s private network (for example, dialing 6). AC2 normally applies to local calls (for example, 9). For more information, see Electronic Switched Network Reference—Signaling and Transmission (NN43001-280).

Nortel Communication Server 1000

Main Ofﬁce Conﬁguration Guide for SRG 50

NN43001-307 02.02 Standard

Release 5.0 3 December 2007

28 Description

Music on Hold

For SRG users in Normal Mode, the main ofﬁce provides music to the user if Music on Hold is provisioned. The use of the G.729A/AB codec between the main ofﬁce and the branch ofﬁce can impact the music quality.

ATTENTION

G.723 codec is not supported on SRG 50.

Branch ofﬁce and SRG 50 terminology

Table 3 "Branch ofﬁce and SRG 50 terminology" (page 28) lists

conﬁguration-related terms and contexts where branch ofﬁce and SRG 50 terminology differ.

Table 3 Branch ofﬁce and SRG 50 terminology

Term or context Branch office

dialing plan on-net/off-net dialing Private/Public network dialing routing distant steering codes (DSC),

Trunk steering codes (TSC), Local steering codes (LSC)

Digit manipulation table dial-out digits (routing)

alternate routing selection

Type of number CDP/UDP/TNDN CDP/UDP/no equivalent Numbering Plan ID ISDN/Telephony

User ID BUID BUID

Trunks public exchange PSTN

access codes (SRG 50: destination codes)

Facility Restriction Level (FRL) scheduled call routing

(E.164),Private, Telephony (E.163), Telex, (F.69), Data (X.121), National Standard

bandwidth management zone Zone ID

virtual trunk IP trunk 7 = system trunk access

SRG 50

call routing, destination codes, line pool access codes

Private

7 = not assigned

8 = Basic Alternate Route Selection (BARS)/Network Alternate Route Selection (NARS)

9 = public exchange access

8 = not assigned

9 = line pool A access code

Nortel Communication Server 1000

Main Ofﬁce Conﬁguration Guide for SRG 50

NN43001-307 02.02 Standard

Release 5.0 3 December 2007

Limitations 29

Term or context Branch office

Network Class of Service (NCOS)

telephone numbers (internal, not PSTN)

DN DN

Limitations

The following is a list of limitations for SRG 50 Release 3.0:

•

When an IP Phone is in Local Mode, the SRG 50 does not provide all the features as those provided by the CS 1000 main ofﬁce. In Local Mode, the SRG provides basic features, basic call handling, and basic routing capabilities only.

•

When an IP Phone is in Local Mode, the SRG 50 does not support IP Phone Key Expansion Module or Expansion Module for IP Phone 1100 Series.

•

You cannot conﬁgure the BUID and MOTN using the IP Phone. Conﬁgure the BUID and MOTN using SRG Element Manager.

•

The SRG and the CS 1000 are conﬁgured separately. There is no single management paradigm or application to update both the CS 1000 and the SRG. Use Element Manager to conﬁgure the SRG, and use standard conﬁguration tools to conﬁgure the CS 1000.

SRG 50

•

Virtual Ofﬁce Login is not supported in Local Mode.

• Language, Volume, and Contrast settings in the SRG are not

synchronized with the CS 1000 settings which causes a potential mismatch in settings between Normal Mode and Local Mode.

•

Language options available on the CS 1000 may not be available on the SRG.

•

For the CS 1000 Release 5.0 Alternate Routing for Network Bandwidth Management feature, the SRG does not support an automatic redirection of IP trunk calls through the PSTN when such calls are blocked by the CS 1000 due to bandwidth availability.

•

Multiple ESDN is not supported.

•

VLAN tagging is not supported. However, VLAN tagging is achieved by using an external router.

•

Active Call Failover is not supported.

•

SIP trunks are used only for voice packet trafﬁc alone. H.323 trunking is used for main ofﬁce and Gatekeeper/NRS discovery, polling of WAN link, as well as voice trafﬁc.

Nortel Communication Server 1000

Main Ofﬁce Conﬁguration Guide for SRG 50

NN43001-307 02.02 Standard

Release 5.0 3 December 2007

30 Description

Nortel Communication Server 1000

Main Ofﬁce Conﬁguration Guide for SRG 50

NN43001-307 02.02 Standard

Release 5.0 3 December 2007

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