Multisite Centralized WAN Call Processing Model

The centralized WAN call-processing model is a solution for medium enterprises with one large location and many remote sites. Figure 15-12 shows the centralized call-processing model. A CM cluster with multiple servers is deployed for redundancy at the large site. Call processing and voice mail servers are located in only the main site. Remote-site IP phones register to the CM cluster located in the main site. PoE switches are used to power all IP phones. Remote sites use voice-enabled gateway routers with SRST for redundancy.

Figure 15-12 Multisite Centralized WAN CM Deployment Model

Figure 15-12 Multisite Centralized WAN CM Deployment Model

On the WAN, QoS features are configured to prioritize the VoIP packets over other packet types. In the event of WAN failure, SRST configured routers forward calls through the PSTN. The PSTN circuit can be used for local inbound and outbound calls at the remote site. In this model, call admission control (CAC) is configured to impose a limit on the number of on-net calls permitted between sites.

On the WAN, QoS features are configured to prioritize the VoIP packets over other packet types. In the event of WAN failure, SRST configured routers forward calls through the PSTN. The PSTN circuit can be used for local inbound and outbound calls at the remote site. In this model, call admission control (CAC) is configured to impose a limit on the number of on-net calls permitted between sites.

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