The following list summarizes the key points that were discussed in this chapter:
■ Supported CUCM deployment models are single-site, multisite with centralized call processing, multisite with distributed call processing, and clustering over the IP WAN.
■ In the Single-Site deployment model, the CUCM, applications, and DSP resources are at the same physical location; all offsite calls are handled by the PSTN.
■ The Multisite with Centralized Call Processing model has a single CUCM cluster; applications and DSP resources can be centralized or distributed; the IP WAN carries call-control signaling traffic even for calls within a remote site.
■ The Multisite with Distributed Call Processing model has multiple independent sites, each with a CUCM cluster; the IP WAN carries traffic only for intersite calls.
■ Clustering over the WAN provides centralized administration, a unified dial plan, feature extension to all offices, and support for more remote phones during failover, but it places strict delay and bandwidth requirements on the WAN.
■ Clusters provide redundancy. A 1:1 redundancy design offers the highest availability but requires most resources and is not as cost-effective as 1:2 redundancy.
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