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MCD Software Overview

Figure 6: Bandwidth Management at Zone Access Points

Resiliency

Resiliency on MCD increases the reliability of communications by maintaining calls in progress,

handling new incoming and outgoing calls, and continuing to provide voice mail services in the

event of MCD or network failures. The Resiliency solution preserves system functionality in the

event of network difficulties by distributing network intelligence throughout “resilient” clusters

that anticipate and pro-actively mitigate system failures.

By taking advantage of IP-network characteristics of location independence, resiliency provides

a flexible solution to enhance system reliability. By using resources that are spread across the

network, resiliency ensures there is no single point of failure and optimizes hardware use.

Resiliency provides an advantage over many other competing alternatives where solutions

involve costly hardware redundancy for each controller.

If the primary controller experiences a service outage, support for resilient devices is

automatically transferred to the secondary controller. During the transfer of phone service

between the primary and secondary controllers, calls in progress are maintained, ensuring that

IP phone users are not affected by the controller outage. The following figure illustrates how

you can configure a site with fully resilient devices. Node B is the secondary controller for the

phones on Node A, and Node A is the secondary controller for the phones on Node B. If a

controller experiences an outage, phone support is transferred to its secondary controller.

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