192 APPENDIX A: UPGRADING VCX S ERVER SOFTWARE FROM V7.0 TO V7.1System Administration Guide for more information and forconfiguration options.The components in a multi-site VCX system can be set up in manypossible configurations. The procedures in this section are based on amulti-site VCX system that includes two regions (Region 1 and Region 2)with multiple branch offices in each region.All upgrade commands are executed locally at the console.When upgrading a region-to-region office configuration, you must dropreplication between the Authentication and Directory server in eachregion.CAUTION: When upgrading a multi-site VCX system, upgrade theregional servers before upgrading the branch servers. If you upgrade thebranch servers first, the database schema on the branches may not matchthe schema version on the region causing database replication failure.Multi-Site VCXSystem UpgradeOrderWhen upgrading a multi-site VCX system configuration, upgrade thecomponents in the following order:■ If you plan to enable Global Voicemail Integration, install IP Messagingsoftware on a pair of Global Voicemail Central Servers, and then setup the GVCS through the IP Messaging administrator configurationinterface before enabling global voicemail integration on regional andbranch office IP Messaging servers.■ Upgrade the replicated Authentication and Directory servers in eachregional office.■ Upgrade the IP Messaging servers in each regional office.■ Upgrade the Call servers in each regional office.■ Upgrade the Call Records server (optional).■ Upgrade the branch offices hosted by a region.Upgrading theRegionalAuthentication andDirectory ServersThis section describes how to upgrade the Authentication and Directoryservers in Region 1 and Region 2.In this example of two-region replication, replication is dropped on theAuthentication and Directory server in each region. As the number ofregions increases, so does the complexity of replication. The upgradeprocess for Authentication and Directory servers in a multi-region system
