Reliant Octel 300 Specifications download pdf (Page 130)

IP Office Product Description

IP Office 4.2

Page 130

Issue 18.b.- (08 July 2008)

Gateways, Gatekeepers and H.323 - Technology Overview

IP Office uses the H.323 signaling protocol which has the following architectural components

· Telephones are H.323 service endpoint devices that can support Audio calls. Other types of H.323

devices can support video as part of H.323

· Gateways provide media translation to allow calls to be made to non-H.323 devices, for instance an

analog telephone or the public network to connect with a H.323 device

· Gatekeepers control the call processing and security for H.323 devices

· Multipoint Connection Units (MCU) for conferences by adding together media streams

These elements are grouped together in what is known as an H.323 zone (a zone is analogous to a PABX).

Each zone has a single Gatekeeper that can be considered as the brains of the system dealing with call

distribution, call control and the management of resources. On power-up, IP telephones, Gateways and MCU

make registration requests to a Gatekeeper which then authenticates (accepts or rejects) their request to

become a member of the zone. Once accepted, a telephone wishing to make a call sends a call set-up

message to the Gatekeeper which then determines how to route the call and will then send an alert to the

called telephone, or if the call is to a non-H.323 telephone establish the call via a Gateway within the zone.

The design of IP Telephony systems has been driven by open standards. Digital IP Phones, Gateways and

Gatekeepers all support the H.323 standard and it is this that allows devices from different manufacturers to

work together. IP Office has an optional integral Gateway (Voice Compression Modules) and Gatekeeper

functionality required to provide a fully functional IP Telephony solution.

1 2 ... 125 126 127 128 129 130 131 132 133 134 135 ... 335 336

No comments

Reliant Octel 300 Specifications Page 130