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Chapter 1. Understanding VoIP Basics > Clustering over the WAN Deployment

Clustering over the WAN Deployment

In an IP telephony environment that spans multiple locations, having all UCM servers belong to the same cluster can simplify administration. However, having a single cluster at a single site leads to redundancy issues in the event of an IP WAN outage. However, a fourth deployment approach, clustering over the WAN, offers the benefit of having all UCM servers belong to a single server while having the servers physically dispersed across the various remote locations. Specifically, each site has one or more UCM servers on site. These dispersed UCM servers are then logically grouped together into a single cluster, as illustrated in Figure 1-10. This type of design does have bandwidth and delay requirements to support the intracluster communication among the UCM servers. For example, Cisco requires no more than a 40-ms round-trip delay between any two UCM servers in the cluster.


  

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