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Chapter 3 Cisco CallManager Clusters

Campus Clustering Guidelines

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Cisco IP Telephony Network Design Guide

78-11103-03

Campus Clustering Guidelines

All members of a Cisco CallManager cluster must be interconnected over a LAN.

Cisco CallManager Release 3.0(5) clusters are not supported over a WAN.

The following considerations apply when configuring a campus IP telephony

network:

• Maximum of eight servers per cluster with Cisco CallManager release 3.0(5).

• Maximum of 10,000 total registered devices.

• Maximum of 2500 registered IP phones or 3000 devices per

Cisco CallManager, including devices registered under failure conditions.

• Switched infrastructure to the desktop (shared media is not supported).

Within a switched campus infrastructure, you can generally assume that the

bandwidth is adequate for voice applications. This bandwidth availability depends

upon appropriate design and capacity planning within the campus in addition to

the establishment of a trust boundary and the required queuing, as discussed in

Chapter 2, “Campus Infrastructure Considerations.” There is no requirement for

call admission control within a campus cluster.

Cisco CallManager servers should be distributed within the campus to provide

spatial redundancy and resiliency. Many metropolitan sites and campus buildings

may have only a single conduit providing IP connectivity to other members of the

cluster. In this case, if IP connectivity fails, local call processing must be

maintained by means of a local server. Gateway resources for PSTN access should

likewise be placed strategically to provide the highest possible availability.

Figure 3-6 depicts a typical campus or metropolitan-area network (MAN) cluster

deployment.

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Cisco WS-X4604-GWY - VoIP Gateway Especificaciones Pagina 84