Cisco Unified Communications Manager Architecture Infrastructure layer: The infrastructure consists of routers, switches, and voice gateways. The infrastructure layer carries data, voice, and video between all network devices and applications. This layer also provides high availability, management, quality of service (QoS), and network security. Call control layer: The call control layer provides for call processing, device control, and administration of the dial plan and features.
Call control can be provided by a CUCM, CUCM Express, or CUCM Business Edition (CMBE). This book focuses on the CUCM product, which is almost identical to the Cisco Unified CMBE. Call processing is physically independent from the infrastructure layer. For example, a CUCM, Cisco Unified CMBE, or CUCM Express in San Jose can process call control for a device physically located in Chicago.
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