Chapter 7. VoIP in a Campus Network

Many companies are integrating Voice over IP (VoIP) into their networks. Figure 7-1 shows some components of a VoIP system, which can include the following:

Some Components of a VoIP System

Figure 7-1. Some Components of a VoIP System

  • IP phones—. Provide voice and applications to the user.

  • Voice gateways—. Translates between PSTN and IP calls and provides backup to the Cisco CallManager (IP PBX, or Call Agent).

  • Gatekeepers—. An optional component that can do call admission control, allocate bandwidth for calls, and resolve phone numbers into IP addresses.

  • Cisco CallManager—. Serves as an IP PBX. Registers phones, controls calls.

  • Video conferencing ...

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