Specifications

CHAPTER 8
Voice and Video in a Campus Network
Data requirements typically include high bandwidth, but delay and jitter are not crucial. A highly available network is
needed, but PoE is not. Data security should be high, with medium management levels.
VoIP in a Campus Network
Figure 8-1 shows some components of a VoIP system, which can include the following:
n IP phones: Provide voice and applications to the user
n Cisco Unified Communications Manager (UCM): Serves as an IP PBX. Registers phones, controls calls
n Voice gateways: Translates between PSTN and IP calls and provides backup to the Cisco UCM (IP PBX, or Call
Agent)
n Gatekeepers: An optional component that can do call admission control, allocate bandwidth for calls, and resolve
phone numbers into IP addresses
n Video conferencing unit: Allows voice and video in the same phone call
n Multipoint control unit: Allows multiple participants to join an audio and/or video conference call
n Application server: Provides services such as Unity voice mail and Presence
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CCNP SWITCH 642-813 Quick Reference by Denise Donohue
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