McDewey

Preferred Architecture for Cisco Collaboration Release 15 On-Premises Deployments PAGE 30
Collaboration Edge

Redundancy is achieved by deploying multiple Cat8Ks or ISR 4461s. Cisco Unified CM has the ability to route traffic to the closest available router. If SIP trunks are used to connect to a service provider for voice calls, enable Cisco Unified Border Element (CUBE) functionality on the Cisco ISR that is deployed at headquarters, and deploy CUBE in the demilitarized zone (DMZ). Cisco Unified CM routes calls through SIP trunks to gateways, CUBE, or Cisco Expressway based on the dial plan. For dial plan recommendations, see the Call Control section. Benefits This deployment provides the following benefits: • The Cat8K and ISR 4461 support standards-based interfaces and various PSTN types, so it can be deployed globally. • Instead of traditional PSTN interfaces, Cisco Unified Border Element functionality can be enabled on the Cat8K and ISR 4461 if a SIP trunk is used. • The Cat8K and ISR 4461 can be used for WAN connectivity. • Cisco Expressway provides calling, presence, instant messaging, voicemail, and corporate directory services for Cisco Jabber and TelePresence video endpoints. • Cisco Expressway enables video communications between organizations, partners, and vendors over the Internet.