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C H A P T E R

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Cisco AVVID Network Infrastructure Enterprise Quality of Service Design

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QoS in a SOHO Virtual Private Network for IP
Telephony

This chapter provides information about implementing QoS in an AVVID-enabled Small Office Home
Office (SOHO) Virtual Private Network (VPN) for IP telephony. It includes the following:

Note

This chapter contains references to other documents. These references are included as tips in the text.
The URL for each referenced document is located in

Appendix A, "Reference Information."

In some

cases, an internal document is referenced. For copies of internal documents, please see your Cisco
Systems representative.

Overview

As IP telephony becomes accepted in the enterprise, the ability to extend its functionality to SOHO
environments is becoming more desirable. This chapter provides in-depth design and configuration
guidance for implementation of QoS in a SOHO environment. It focuses on the CPE, or enterprise,
implementation of QoS features and functionality. This document does not cover end-to-end QoS design
and implementation as it does not include SP design and configuration guidance.

There are many points in SOHO networks where QoS mechanisms are required to manage loss, delay,
and delay variation.

Figure 5-1

illustrates areas where QoS mechanisms are required to control the

impact of loss, delay, and delay variation on voice performance.