Description

Individual sites of a multisite deployment are usually interconnected by an IP WAN in situations in which bandwidth is relatively costly and bandwidth consumption should be minimized. Call Admission Control (CAC) is also important in a multisite environment in order to avoid bandwidth oversubscription by too many voice calls.
This course describes methods of reducing bandwidth requirements and explains how to design and implement those methods so that the IP WAN bandwidth can be used as efficiently as possible. It also describes CAC options for intrasite calls and intersite calls and how to implement them in a multisite Cisco Unified Communications Manager deployment. The course also describes automated alternate routing (AAR), which allows the Public Switched Telephone Network (PSTN) to be used as a backup for calls that CAC denies due to insufficient bandwidth.