Nortel Networks SRG50 manual Survivability

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36 Chapter 4 CS 1000 considerations

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 SRG50 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 SRG50 handles all call processing, calls between two IP phones at the SRG50 are handled locally as a simple station-to-station call. When an IP Phone initiates a local PSTN call, the SRG50 routes the call to a trunk that is connected to the local PSTN. Incoming DID calls are also handled by the SRG50 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.

While in local mode, the SRG50 system continues to monitor for a main office CS1000 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 redirection occurs almost immediately. This reinstates the CS1000 normal user interface and feature set for the IP Phone user, on a user by user basis.

The SRG50 system implements the same interface used by the MG1000B system to interact with the main office CS1000 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 which automatically reregisters users once WAN or system failure has recovered.

Survivability

SRG is specifically designed to provide automatic survivability against WAN failure, main office Call Server failure, main office Signaling Server failure, and NRS (gatekeeper) failure.

SRG supports the Geographic Redundancy feature.

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.

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 network connection server (NCS).

NN40140-500

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Contents SRG50 Configuration Guide Copyright 2006-2008 Nortel Networks, All Rights Reserved SRG50 Configuration Guide Task ListNN40140-500 Contents Fallback configuration Gatekeeper routing Glossary NN40140-500 Getting started About this guideAudience AcronymsGetting started Acronyms used in this guide Sheet 2 Symbols and conventions used in this guide Command line prompts on display telephonesGetting started Convention Example Used for Word in a special font shownRelated publications Convention Example Used forHow to get help Getting Help from the Nortel Web siteGetting started NN40140-500 Features SRG 1.5 on BCM SRG50 400 SRG50 overviewBCM50 default IP addresses SRG50 creationPort IP address Subnet mask BCM50 default user names and passwords SRG50 keycode activationTo activate the SRG keycode Click Load FileSRG50 and BCM50 features comparison To reboot the systemClick Reboot BCM50 System To verify that the SRG has been successfully createdSupported devices SRG50 overview Comparison of BCM50 and SRG50 Sheet 2SRG50 terminology SRG50 terminology Sheet 1Term Description Normal mode Coordination with the main office call serverSRG operating modes SRG50 overview SRG50 terminology Sheet 2Normal mode Local mode Local modeSRG installation and configuration summary Automatic registration with the main officeSRG50 overview Process map for installing and configuring an SRG Foundation configuration Configuration System IP SubsystemConfiguration Resources Application Resources Configuration Telephony Global SettingsIP telephone configuration Task summaryDialing plan configuration VoIP trunk configurationConfiguration Telephony Sets All DNs Configuration Telephony Lines Target LinesConfiguration Telephony Lines Active VoIP Lines Configuration Telephony Lines Active Physical LinesCall routing configuration Redirection and call forward configurationConfiguration Telephony Dialing Plan Routing Task summary NN40140-500 CS 1000 considerations CS 1000 and SRG terminology comparisonCS 1000 considerations Comparison of CS 1000 and SRG terms and contexts Sheet 1AC1 Normal and local mode overview Survivability Recovery to normal mode Testing the telephone in local modeVirtual trunk capacity Vacant Number Routing VNRBandwidth management Network Bandwidth Management Nbwm Adaptive Network Bandwidth Management AdbwmAlternative Call Routing ACR Bandwidth management configuration NBWM, ADBWM, To configure SRG for Nbwm and AdbwmTo configure Alternative Call Routing with did trunks Ensure that the DN Type is Public UnknownEmergency Services Access ESA configuration To configure Emergency Services Access To configure on-site notificationS1000 Main Office Settings panel S1000 Main Office Settings Sheet 1CS 1000 information for the SRG S1000 Main Office Settings Sheet 2 To datafill the S1000 Main Office Settings panel CS 1000 considerations S1000 Main Office Settings Sheet 3MO Access Code Length Field Values Description Node IDIP telephones redirection IP telephones numbers and modelsIP telephone numbers and models Sheet 1 S1000 IP Terminal Details panel SRG S1000 IP Terminal Details fields Sheet 1Field Values Description HardwareTo enter the Motn and Buid To redirect the telephone to the main office call serverField Values Description Firmware VersionIP telephone settings Configuration settings for redirected IP PhonesParameter Setting Firmware upgrade Firmware upgrade procedureSupported firmware Supported IP clients and firmware versionsCS 1000 considerations NN40140-500 IP telephones setup and configuration Registration passwordTo set the IP telephone registration password IP telephones setup and configuration Password registration parametersLocal mode indication IP telephone codec and jitter settingsTo change local mode indication Telephone DN records configuration To configure DN records for redirected IP telephonesIP telephones setup and configuration Select the Capabilities and Preferences tab Model ButtonReceived numbers configuration To map received numbers to the DNDhcp settings configuration To configure Dhcp settings for SRG operationCall forwarding options Configuration settings for redirected phones Test Local ModeTo activate Test Local Mode Configuration settings for redirected IP telephonesFeatures in local mode To exit Test Local Mode and return to Normal ModeReceiver volume Delayed ring transferEmergency Services Support Alarm setHeld line reminder Language and ContrastIP telephones setup and configuration NN40140-500 Setting up the private VoIP network IP networking, SRG to WAN, main office to WANSetting up the private VoIP network VoIP trunksBasic parameters Basic parameters Sheet 1Parameter Value Context Setting up the private VoIP network Basic parameters Sheet 2 Private dialing planTo enable Mcdn TAT Meridian Customer Defined Network McdnQoS settings codec, jitter buffer, and related items Main office QoS settings Sheet 1Media parameter Settings SIP settings To enter the QoS settings for VoIP trunks Modules panel, IP Trunks SRG50 Configuration GuideVoIP trunking configuration Fallback configurationTo enable fallback Network securityTo configure gatekeeper settings for H323 trunks Gatekeeper routingOutgoing calls configuration To configure routing for outgoing callsLine pools Call routingSelect the Destination Codes tab SRG Pstn access Remote Access Package for VoIP trunksTo configure remote access packages Pstn destination codes configuration To configure destination codes for the PstnMain office information External attendant supportPstn access and analog devices Pstn access considerationsAnalog devices considerations To configure the DNs for analog devices Access to system featuresPstn access and analog devices Select the Capabilities and Preferences tab Pstn access and analog devices NN40140-500 Troubleshooting IP telephone troubleshootingIP telephone troubleshooting Sheet 1 Issue / Problem Probable Cause / SolutionTroubleshooting IP telephone troubleshooting Sheet 2 IP terminal detailsIP Terminal Details Sheet 1 Call Server Details Event Id Severity Type CommentsTroubleshooting Probable causes for redirection failureIP Terminal Details Sheet 2 Troubleshooting fallback to local mode IP telephones manual redirectionTo manually redirect an IP telephone to the main office IP telephone firmware discrepanciesCannot clear alarms using an alarm set Troubleshooting NN40140-500 Telephone features in normal and local mode Normal modeLocal mode IP Phone 1110 in Local mode Telephone features in normal and local modeIP Phone 1120E in Local mode IP Phone 1140E in Local modeIntercom/Line IP Phone 2001 in Local mode IP Phone 2002 in Local modeIP Phone 2004 in Local mode IP Phone 2007 in Local modeIP Phone 2033 in Local mode ATA extension features IP 2050 Softphone in Local ModeFeature Activate Cancel Link key sequences Sheet 1Link *3 Gatekeeper Gateway H.323 IP telephones Local mode GlossaryBranch office Call routing Dialing planNormal mode QoS GlossaryMain office, main office call server Steering codesIndex 100 101 102
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