Page 124 - Voice Over IP Basics

Appendix B: Concepts

Gatekeeper

Terminals are the LAN client endpoints that provide real time two way communications. When an endpoint is switched on, it performs a multicast discovery for a gatekeeper and registers with it. Thus the gatekeeper knows how many users are connected and where they are located. The collection of a gatekeeper and its registered endpoints is called as a zone. A gatekeeper is required to perform the following functions:

Address translation

Translation of an alias address to a Transport Address using a table updated via Registration messages.

Admissions control

Authorization of LAN access, using Admissions Requests or Confirm and Reject (ARQ/ARC/ARJ) messages. Access is based on call authorization, bandwidth or some other criteria.

Bandwidth management

Support for Bandwidth Request, Confirm and Reject messages, or a null function that accepts all requests for bandwidth changes.

Zone management

The Gatekeeper provides the above functions for terminals, MCUs, and Gateways, which are registered in its Zone of control.

SoftPhone

The term SoftPhone refers to a IP extension, a dedicated LAN attached H323 compliant device, or a Software programme running on a multi-media PC. An example of a H323 software phone is MS- Netmeeting (3.x).

Page 124 - Appendix B: Concepts

INDeX IPNC Cassette Administration Manual

Voice Over IP Basics

38DHB0002UKDD – Issue 7 (22/11/02)

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Avaya 38DHB0002UKDD manual Gatekeeper, SoftPhone

38DHB0002UKDD specifications

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