Network Infrastructure - Cisco

CHAPTER3-1 Cisco Unified CallManager Express Solution Reference Network Design GuideOL-10621-013 Network InfrastructureThis chapter describes the requirements of the Network Infrastructure needed to build an IP telephony system in an enterprise environment. Figure 3-1 illustrates the roles of the various devices that form the Network Infrastructure of a large-scale enterprise Network , and Ta b l e 3 -1 summarizes the features required to support each of these telephony places strict requirements on IP packet loss, packet delay, and delay variation (or jitter). Therefore, you need to enable most of the Quality of Service (QoS) mechanisms available on Cisco switches and routers throughout the Network . For the same reasons, redundant devices and Network links that provide quick convergence after Network failures or topology changes are also important to ensure a highly available general, this document focuses on standalone and multisite Cisco Unified CallManager Express ( Cisco Unified CME) implementations.

Figure 3-2 Standalone Office Network Topology The network inFigure 3-2 has the following components: † Employee desktop—Cisco 7960 IP Phones are provided for employees who work at a desk with a computer. The PC is connected via the phone’s Ethernet switch. It also is connected via a single

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