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Table 6 lists the roles of the call control components in this architecture and the services they provide. Table 6. Components for Call Control Module Component Description Call Control Cisco Unified Communications Manager (Unified CM) Provides call routing and services, dial plan, and bandwidth management; and enables Cisco Jabber desk phone control Cisco Unified Communications Manager IM and Presence Service Provides Cisco Jabber support for instant messaging and user-based presence and third- party federation Cisco Integrated Services Router (ISR) Provides Survivable Remote Site Telephony (SRST) to support call control functions during a WAN outage Recommended Deployment For call control in the Cisco Collaboration on-premises Preferred Architecture, we recommend the following:
• Deploy a single Cisco Unified CM cluster for an enterprise with a central site and remote offices. Deploy call processing subscribers in pairs for scalability and redundancy. • Add additional Cisco Unified CM clusters for very large sites or for geographic and/or organizational separation. Configure SIP trunks to interconnect individual Cisco Unified CM clusters. • Deploy a pair of IM and Presence Service servers in a cluster configuration. For enterprise deployments, you can add more pairs for scalability. (Increased scalability does not apply to midmarket deployments.) • Enable SRST on the Cisco ISR as a backup service at remote sites to provide high availability. • Enable Apple Push Notification service (APNs) for Apple iOS devices running Jabber for iPhone and iPad, so that these clients continue to receive incoming call and messaging notification even when running in the background. For Apple iOS devices operating in a constrained network without Internet access Local Push Notification Service (LPNS) can be deployed to deliver notifications for voice calls only. LPNS does not deliver messaging notifications. LPNS also helps to minimize delays for incoming calls to the Apple iOS devices operating in unconstrained and constrained networks.
• Enable Android Push Notification service for devices running Jabber for Android, so that these clients continue to receive incoming call and messaging notification even when running in the background. Cluster Recommendations Cisco Unified CM and IM and Presence support clustering, which is the grouping of nodes that work together as a single logical entity. The publisher node contains the cluster's configuration database, which is replicated to the call processing subscriber nodes and TFTP nodes in the cluster. Clustering provides an automatic redundancy mechanism for endpoints and for Cisco Unified CM services, such as the ability to receive and process incoming calls. To provide 1:1 redundancy, deploy call processing subscribers and TFTP nodes in pairs. (Figure 6) While the call processing subscribers provide endpoint registration and call processing capabilities, the TFTP nodes provide configuration and firmware updates to endpoints.