Specifically, this chapter focuses on the following topics:
Scale - The number of users, locations, gateways, applications, and so forth. In all cases, the discussions focus predominately on the following factors: In addition, this chapter provides coverage for gatekeeper functionality, which is another critical function for unified communications deployments in scenarios where multiple call processing systems or agents are deployed in parallel. These products include Cisco Unified Communications Manager (Unified CM), Cisco Business Edition, and Cisco Unified Communications Manager Express (Unified CME). This chapter provides guidance for designing scalable and resilient call processing systems with Cisco call processing products. Given the critical nature of call processing operations, it is important to design unified communications deployments to ensure that call processing systems are scalable enough to handle the required number of users and devices and are resilient enough to handle various network and application outages or failures. This functionality is handled by some type of call processing entity or agent. The handling and processing of voice and video calls is a critical function provided by IP telephony systems. Unified CM and Unified CME Interoperability via H.323 in a Multisite Deployment with Distributed Call Processing. Unified CM and Unified CME Interoperability via SIP in a Multisite Deployment with Distributed Call Processing. Ad Hoc and Meet Me Hardware Conferencing. Overview of Interoperability Between Unified CM and Unified CME. Interoperability of Unified CM and Unified CM Express. Gatekeeper Clustering (Alternate Gatekeeper). Redundancy, Failover, and Load Balancing. 
CTI Applications and Clustering Over the WAN.Design Considerations for Call Processing.Cisco Business Edition Capacity Planning.Unified CM Capacity Planning Guidelines and Endpoint Limits.Unified CM Capacity Planning with UCS Platforms.Cisco Business Edition High Availability.Unified Communications Design and Deployment Sizing Considerations.Overview of Cisco Unified Communications Operations and Serviceability.Unified Communications Operations and Serviceability.
Cisco Collaboration Clients and Applications.Overview of Cisco Unified Communications Applications and Services.Unified Communications Applications and Services.Overview of Cisco Unified Communications Call Control.Overview of Cisco Unified Communications Call Routing.Unified Communications Deployment Models.Overview of Cisco Unified Communications Networking.
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