Cisco Systems OL-14619-01 manual Cisco Unity Failover and Standby Redundancy

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C H A P T E R 7

Cisco Unity Failover and Standby Redundancy

See the following sections:

•Comparison of Cisco Unity Failover and Standby Redundancy, page 7-1

•Failover, page 7-1

•Standby Redundancy, page 7-2

Comparison of Cisco Unity Failover and Standby Redundancy

Cisco Unity failover provides system-malfunction failover within a data center. Failover consists of two servers, a primary and a secondary. In general, the primary server is active and taking calls, while the secondary is inactive and not taking calls. Any changes to subscriber or configuration data on the primary server are automatically replicated to the secondary server. If the primary server stops functioning for some reason, the secondary server automatically becomes the active server and starts taking calls. The primary server temporarily becomes inactive.

Cisco Unity standby redundancy provides disaster-recovery failover across geographic locations. There are still two servers, a primary and a secondary, but they are installed in separate data centers, commonly in separate cities. If the data center in which the primary server is installed is affected by a natural disaster or other catastrophe, someone in (or with remote access to) the disaster-recovery facility manually activates the secondary server, and the secondary server begins taking calls.

For more information on how failover and standby redundancy work, see the “About Cisco Unity Failover” chapter in the applicable Failover Configuration and Administration Guide for Cisco Unity at http://www.cisco.com/en/US/products/sw/voicesw/ps2237/products_feature_guides_list.html.

Failover

For a list of the requirements for a failover system, see the “Requirements for Cisco Unity Failover” section in the System Requirements for Cisco Unity Release 5.0 at http://www.cisco.com/en/US/products/sw/voicesw/ps2237/prod_installation_guides_list.html.

Design Guide for Cisco Unity Release 5.x

	OL-14619-01	7-1

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Contents Americas Headquarters Design Guide for Cisco UnityDesign Guide for Cisco Unity Release N T E N T S Workstations Authentication Centralized Voice Messaging Configuration Viii Document Conventions AudienceSupport Policy for Optional Third-Party Software Cisco Product Security Overview Xii Design Guide Overview Product Area Design or Feature DocumentationDesign Guide for Cisco Unity Bridge at Page Design Guide Overview Design Guide for Cisco Unity Release How Cisco Unity Works Cisco Unity ConceptsVoice Messaging Unified MessagingHardware Components of a Cisco Unity System Cisco Unity Supported Platforms List at One or More Cisco Unity ServersNetwork Connection Optional for Some Configurations Software Components of a Cisco Unity System Where Cisco Unity Stores DataVoice Messages Are Stored in Domino or Exchange DominoExchange Enabling Cisco Unity Servers to Communicate with One Another Networking Guide for Cisco Unity at Some Configuration Settings Are Stored in the Registry Availability of Network Resources Name ResolutionAvailability of Message Store Servers Domain Controller Access and AvailabilitySizing and Scaling Cisco Unity Servers Using Firewalls with Cisco UnityNumber of Voice Ports Storage Capacity for Voice MessagesHow Codecs Affect the File Size of Voice Messages Audio CodecsInteroperability Among Multiple Voice-Messaging Systems TTS, TTY, Pocket PCs, and Hand-Held ComputersAudio Codec Quality RatingDeployment Models Unified Messaging with Customer-Provided Infrastructure Multi-Site WAN with Distributed Messaging Voice Messaging with Customer-Provided InfrastructurePhysical Placement and Network Infrastructure Active Directory Considerations Considerations for Customer-Provided InfrastructureDesign Guide for Cisco Unity Release Exchange Considerations All Versions Exchange Considerations That Apply Only Exchange Considerations for Cisco-Provided, Dedicated Infrastructure OL-14619-01 Overview of Cisco Unity with Domino and Notes Domino Address Book Terminology Maximum Number of Cisco Unity SubscribersElement Name Changes That csAdmin Makes to the Domino Address BookChanges That csClient Makes to the Mail File Windows Domains and Domino Domains Server PlacementActive Directory Accounts and Permissions AuthenticationDomino Permissions Cisco Unity Subscribers and Domino UsersDomino Clusters Cisco Unity and the Domino Address Book Client Access LicensesMessage Routing Backing Up and Restoring DataUnified Messaging Configurations Unified Messaging, No Domino ClusterServers Requirements and Recommendations Voice Messaging Configuration Criteria for a Supported ConfigurationUnified Messaging, Domino Cluster Deploying Cisco Unity for Lotus Domino Network Services Administrative Access and ControlDeployment Tasks for Unified Messaging Configurations Establishing Support PoliciesOperational Tasks Design Guide for Cisco Unity Release Overview Integrating Cisco Unity with the Phone SystemHow an Integration Works Lines and Cables to Make Physical Connections Integration with Cisco Unified Communications ManagerDigital Integration with Digital Pimg Units Dtmf Integration with Analog Pimg Units LAN/WAN Timg IntegrationSerial Integration with Voice Cards Dtmf Integration with Voice CardsConnections for a Serial Integration by Using Voice Cards Settings in the Phone System and in Cisco UnityCall Control General Integration Issues Sccp SIP FeatureIntegrating Cisco Unity with the Phone System Option Considerations Description Cisco Unified Communications Manager Security FeaturesDescription Setting Effect When Data Is EncryptedDisabling and Re-Enabling Security Settings for Individual Voice Messaging PortsPacketization Sccp Integrations Only Sccp SIP Cisco 11 Cisco Unified Communications Manager Fallback with Pstn Cisco Unity to a branch office will fail Integrating by Using SIP Supported SIP Integrations Cisco Unity Failover with SIP TrunksSIP Compliance Description of Pimg Integrations Dtmf Integration with Analog Pimg Units Description of Timg Integrations Firmware Updates Serial Integrations Setup and ConfigurationCisco Unity Failover Increasing Port CapacityMultiple Integration Support/Branch Office Consolidation Cisco Unity FailbackIntegrating with Multiple Phone Systems Requirements for Integrations with Multiple Phone Systems Using Sccp Phone Systems with Other IntegrationsAlternate Extensions Optional Integration FeaturesReasons to Use Alternate Extensions How Alternate Extensions WorkMWIs for Extensions on a Non-Integrated Phone System Alternate MWIsCentralized Voice Messaging OL-14619-01 OL-14619-01 Failover Cisco Unity Failover and Standby RedundancyStandby Redundancy Cisco Unity Failover and Standby Redundancy Cisco Unity Failover and Standby Redundancy Pstn WAN Diagram of a Standby Redundancy ConfigurationOL-14619-01 Voice-Recognition Access to Cisco Unity OL-14619-01 Migrating to Cisco Unity from Another Voice-Messaging System Migrating to Cisco Unity from Another Voice-Messaging System 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