Appendix; Synopsis Of Basic Voip Concepts; Voip Overview; A Voice Primer - Cisco WS C4224V 8FXS - 200Mbps Ethernet Switch Software Configuration Manual

VoIP Overview

OL-2031-02

Synopsis of Basic VoIP Concepts

The Catalyst 4224 Access Gateway Switch (Catalyst 4224) provides Voice over
IP (VoIP) gateway applications for a micro branch office. This chapter introduces
some basic VoIP concepts.
This chapter contains these sections:
VoIP Overview, page B-1
•
A Voice Primer, page B-2
•
The VoIP application allows a Catalyst 4224 to convert analog voice signals such
as telephone calls and faxes into digital IP packets and distribute these packets
across a WAN. In VoIP technology, a digital signal processor (DSP) segments the
voice signals into frames and stores them in packets. These packets are
transported using IP in compliance with the International Telecommunication
Union-Telecommunication Standardization Sector's (ITU-T's) specification
H.323, the specification for transmitting multimedia (voice, video, and data)
across a network.
Because VoIP is a delay-sensitive application, you need to fine-tune your network
from end to end before implementing VoIP. Fine-tuning your network to support
VoIP incorporates a series of protocols and features that improve quality of
service (QoS). Furthermore, you must take traffic shaping into account to ensure
the reliability of VoIP.
Catalyst 4224 Access Gateway Switch Software Configuration Guide
A P P E N D I X
B
B-1