Chapter 16. IP Telephony


This chapter covers the following topics that you need to master for the CCNP BCMSN exam:

  • Power over Ethernet This section discusses how a Catalyst switch can provide power to operate devices such as Cisco IP Phones.

  • Voice VLANs This section explains how voice traffic can be carried over the links between an IP Phone and a Catalyst switch.

  • Voice QoS This section provides an overview of the mechanisms that provide premium quality of service (QoS) for voice traffic.

In addition to carrying regular data, switched campus networks can carry packets that are related to telephone calls. Voice over IP (VoIP), otherwise known as IP Telephony (IPT), uses IP Phones that are connected to switched Ethernet ports.

To properly and effectively carry the traffic for a successful phone call, a combination of many switching features must be used. For example, the Catalyst switches can provide power to IP Phones, form trunk links with IP Phones, and provide the proper level of QoS for voice packet delivery. This chapter covers all these topics as related to the Cisco IP Phone.



CCNP Self-Study(c) CCNP BCMSN Exam Certification Guide
Red Hat Fedora 5 Unleashed
ISBN: N/A
EAN: 2147483647
Year: 2003
Pages: 177

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