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Voice over IP Overview

Figure 1-2

H.323 end point

H.323 endpoints can communicate among each other without the intervention of

any other devices, however to connect them to the PSTN, to manage call setup and

network bandwidth, and to simplify administration, the following devices are

often used:

•

To standardize communication among these devices and endpoints, H.323 utilizes

the following protocols:

•

Software Configuration Guide for the Cisco VG200

1-4

The H.323 Standard

POTS phones

H.323 Gateway

PSTN

TCP/IP network

H.323 gateway—Connects H.323 devices to POTS devices on the PSTN

H.323 gatekeeper—Manages network bandwidth and provides a central point

for call administration

H.323 proxy—An H.323 endpoint that acts as an intermediary between H.323

endpoints and other IP telephony devices

H.245—Used to negotiate channel usage and capabilities

H.225—Used for call signaling and call setup

Registration, Admission and Status (RAS)—Used to communicate with the

H.323 gatekeeper

Real-Time Protocol/Real-Time Control Protocol (RTP/RTCP)—Used to

create and transmit audio packets on the IP data network

Chapter 1

Using the Cisco Voice Gateway 200

H.323 Proxy

Simple IP

telephony devices

H.323 Gatekeeper

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