Nortel 1000 Con?guration guide 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
Copyright © 2005-2007, Nortel Networks
All Rights Reserved.
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.

3
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 SIP Trunks
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).
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
Copyright © 2005-2007, Nortel Networks
.

4Revision history
Nortel Communication Server 1000
Main Office Configuration Guide for SRG 50
NN43001-307 02.02 Standard
Release 5.0 3 December 2007
Copyright © 2005-2007, Nortel Networks
.

5
Contents
New in this release 9
Other 9
Subject 9
Intended audiences 9
Related information 9
NTPs 10
Online 10
CD-ROM 10
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
Normal Mode 19
Bandwidth Management Overview 24
Time of Day 24
SRG IP Phone to local PSTN calls 25
IP Phone to analog (500/2500-type) telephone calls 25
Capacity 26
Branch office dialing plan 27
Branch office and SRG 50 terminology 28
Limitations 29
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
Nortel Communication Server 1000
Main Office Configuration Guide for SRG 50
NN43001-307 02.02 Standard
Release 5.0 3 December 2007
Copyright © 2005-2007, Nortel Networks
.

6Contents
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
Nortel Communication Server 1000
Main Office Configuration Guide for SRG 50
NN43001-307 02.02 Standard
Release 5.0 3 December 2007
Copyright © 2005-2007, Nortel Networks
.

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
Copyright © 2005-2007, Nortel Networks
.

8Contents
Nortel Communication Server 1000
Main Office Configuration Guide for SRG 50
NN43001-307 02.02 Standard
Release 5.0 3 December 2007
Copyright © 2005-2007, Nortel Networks
.

9
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 www.nortel.com. Select Support & Training > Technical
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.
Nortel Communication Server 1000
Main Office Configuration Guide for SRG 50
NN43001-307 02.02 Standard
Release 5.0 3 December 2007
Copyright © 2005-2007, Nortel Networks
.

10 New in this release
NTPs The following NTPs are referenced in this document:
•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)
•IP Line Fundamentals (NN43100-500)
•ISDN Primary Rate Interface Fundamentals (NN43001-569)
•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)
•Communication Server 1000EPlanning and Engineering (NN43041-220)
•Software Input Output Reference—Maintenance (NN43001-711)
•SRG50 Configuration Guide (NN40140-500)
Online To access Nortel documentation online, click the Technical Documentation
link under Support & Training on the Nortel home page:
www.nortel.com
CD-ROM
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
Copyright © 2005-2007, Nortel Networks
.

11
Description
Contents 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
Nortel Communication Server 1000
Main Office Configuration Guide for SRG 50
NN43001-307 02.02 Standard
Release 5.0 3 December 2007
Copyright © 2005-2007, Nortel Networks
.

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 Survivable
users Server support Feature description
SRG 1.0 up to 90 Succession 3.0
CS 1000
Release 4.0
CS 1000
Release 4.5
VoIP and Application Gateway
Local Mode = Basic telephony
features
SRG 50 Release 1.0 up to 32 Succession 3.0
CS 1000
Release 4.0
CS 1000
Release 4.5
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).
SRG200/400 Release
1.5 up to 90 Succession 3.0 CS 1000
Release 4.0
CS 1000
Release 4.5
CS 1000
Release 5.0
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).
SRG 50 Release 2.0 up to 80 Succession 3.0
CS 1000
Release 4.0
CS 1000
Release 4.5
CS 1000
Release 5.0
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).
Nortel Communication Server 1000
Main Office Configuration Guide for SRG 50
NN43001-307 02.02 Standard
Release 5.0 3 December 2007
Copyright © 2005-2007, Nortel Networks
.

Survivable Remote Gateway 13
IP branch office
solution Survivable
users Server support Feature description
SRG 50 Release 3.0 up to 80 CS 1000
Release 5.0 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.
MG 1000B up to 400 Succession 3.0
CS 1000
Release 4.0
CS 1000
Release 4.5
CS 1000
Release 5.0
100% CS 1000 feature and
application redundancy in
survivable mode. Designed and
positioned for larger IP branch
offices.
Provides H.323 and SIP trunking.
MG 1000E up to 400 CS 1000
Release 5.0 Provides survivability with the addition of Call Processor Pentium
Mobile (CP PM).
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 WAN access
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).
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.
Nortel Communication Server 1000
Main Office Configuration Guide for SRG 50
NN43001-307 02.02 Standard
Release 5.0 3 December 2007
Copyright © 2005-2007, Nortel Networks
.

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).
Nortel Communication Server 1000
Main Office Configuration Guide for SRG 50
NN43001-307 02.02 Standard
Release 5.0 3 December 2007
Copyright © 2005-2007, Nortel Networks
.

Main office hardware description 15
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)
•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:
Nortel Communication Server 1000
Main Office Configuration Guide for SRG 50
NN43001-307 02.02 Standard
Release 5.0 3 December 2007
Copyright © 2005-2007, Nortel Networks
.

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
Nortel Communication Server 1000
Main Office Configuration Guide for SRG 50
NN43001-307 02.02 Standard
Release 5.0 3 December 2007
Copyright © 2005-2007, Nortel Networks
.

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
NN43001-307 02.02 Standard
Release 5.0 3 December 2007
Copyright © 2005-2007, Nortel Networks
.

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.
Nortel Communication Server 1000
Main Office Configuration Guide for SRG 50
NN43001-307 02.02 Standard
Release 5.0 3 December 2007
Copyright © 2005-2007, Nortel Networks
.

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.
For software 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.
Nortel Communication Server 1000
Main Office Configuration Guide for SRG 50
NN43001-307 02.02 Standard
Release 5.0 3 December 2007
Copyright © 2005-2007, Nortel Networks
.

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.
Nortel Communication Server 1000
Main Office Configuration Guide for SRG 50
NN43001-307 02.02 Standard
Release 5.0 3 December 2007
Copyright © 2005-2007, Nortel Networks
.