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ISDN Videoconferencing ISDN is a service offered by telephone companies over the circuit switched network to support Voice, Telephone and Data Applications. This document will give an overview of H.320 protocols and outline the procedures for using JVCS-ISDN. Understanding ISDN There are two types of ISDN interface: Primary Rate ISDN (PRI) Interface and Basic Rate ISDN (BRI) interface. A BRI is an ISDN interface that provides two 64Kbps B-channels and one D-channel.
Introduction JVCS-Check (the JANET Videoconferencing Service-Check) is an easy to use online tool which provides an instant audio and video assessment facility for IP-based (H.323) videoconferencing endpoints.A typical JVCS-Check assessment session takes just over ten minutes to complete and consists of ten sections, each introduced by a technical summary from a recorded presenter:
Videoconferencing Quality Issues Note: these comments refer to Standard Definition videoconferencing. It is useful to consider some very basic information on how standard definition VC systems operate which will help in understanding the limitations of video quality over a videoconference link. There are two measures of quality in an image:
Introduction JVCS-Check (the JANET Videoconferencing Service-Check) is an easy to use online tool which provides an instant audio and video assessment facility for IP-based (H.323) videoconferencing endpoints.A typical JVCS-Check assessment session takes just over ten minutes to complete and consists of ten sections, each introduced by a technical summary from a recorded presenter:
Videoconferencing, in common with most Information Technology (IT) related fields, has its own language, jargon and engineering standards. To the newcomer, the range and number of different standards can be bewildering. Unless the reader has a background in telecommunications most of these standards are unlikely to be familiar and even then only those directly involved with networking/videoconferencing are likely to be completely conversant with them. A basic understanding of the standards
This document is intended for use by those at Janet primary-connected organisations who have responsibility for deploying and/or configuring an organisational H.323 gatekeeper. It is intended to be a practical aid and does not consider the technical considerations underlying configuration commands unless these are necessary for the explanation of configuration options. The examples and discussion are confined to those commands necessary (both required and optional) for configuring the gatekeeper to work with the JVCS (Janet Videoconferencing Service).
This guide discusses the potential security threats to an Internet Protocol (IP)-based videoconferencing system and the measures that can be taken to help combat those threats. The guide is aimed at sites deploying such H.323 videoconferencing systems in the UK Higher and Further Education communities, but may be equally applicable elsewhere.
Guests can join the videoconference by phone without needing access to videoconference facilities themselves, and without needing to be registered as users of the service. In booking the videoconference, the administrator simply selects a new guest type: “telephone (audio only)”, and enters the name and email address of the telephone participant. The telephone guest is then emailed a number to call into the videoconference.