Cisco ATA186-I2 Administrator's Manual page 22

H.323 Overview
Figure 1-2
Telephone/fax
Figure 1-3
Telephone/fax
H.323 Overview
H.323 is the International Telecommunication Union (ITU) standard for transmitting voice, video, and
data across an IP network. Like other VoIP protocols, the H.323 standard is designed to address the
functions of signaling and session management from within a packet telephony network. Signaling
allows call information to be carried across network boundaries. Session management provides the
ability to control the attributes of an end-to-end call. The H.323 standard includes support for call
signaling and control, multimedia transport and control, and bandwidth control for both point-to-point
and point-to-multipoint conferences.
The H.323 standard includes the following protocols:
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Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide for H.323 (version 3.0)
1-2
Cisco ATA 186 as Endpoint in an H.323 Network
V
Ethernet
Cisco ATA 186
Cisco ATA 188 as Endpoint in an H.323 Network
V Ethernet
Cisco ATA 188
Call signaling using the H.225 protocol
Media control using the H.245 protocol
G.711, G.722, G.723, G.728, and G.729 audio codecs
H.261 and H.263 video codecs
Data sharing using the T.120 protocol
Real-time transport protocol (RTP) and RTP Control Protocol (RTCP) for media transport
Chapter 1
Broadband
Broadband CPE
(DSL, cable,
fixed wireless)
Broadband
Broadband CPE
(DSL, cable,
fixed wireless)
Cisco Analog Telephone Adaptor Overview
Voice
Layer 3
gateway
IP infrastructure
V
H.323 Gatekeeper
Voice
Layer 3
gateway
IP infrastructure
PSTN
V
H.323 Gatekeeper
OL-4804-01
PSTN