Voice and Telephony
IP telephony is a component of Cisco's AVVID framework—integrating voice, video, and data in the same infrastructure. AVVID was discussed in Chapter 2, “Designing Switched Networks.” Like multicasting, which was discussed in Chapter 8, “Multicasts,” IP telephony presents its own set of problems and issues. Designing a scalable network with support for IP telephony is not a simple task. During the design phase, you'll have to address the following questions:
Will your current cable plant support IP phones? At a minimum, you'll need Category 5 cabling.
Do your switches provide inline power for IP phones? IP phones require a powered connection, which a normal switch cannot provide—you can purchase inline powered cards for Catalyst ...