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Voice Communications Using Digital Networks
Voice Communications Using Digital Networks
Voice Communications Using Digital Networks July 21, 1997 TABLE OF CONTENTS EXECUTIVE SUMMARY 1 INTRODUCTION 3 A BRIEF HISTORY OF VOIP 6 VOICE COMPRESSION TECHNOLOGY 10 VOICE DATA TRANSMISSION 17 CURRENTLY AVAILABLE SOFTWARE 21 THE VALUE OF VOIP 42 THE FUTURE OF VOIP 45 SUMMARY 50 APPENDIX A 53 APPENDIX B 55 BIBLIOGRAPHY 56 TABLE OF FIGURES 59 Executive Summary The decade of the nineteen nineties is often labeled the information age. Few would argue against the statement timely information avail
What is ISDN
What is ISDN
What is ISDN? ISDN, which stands for integrated services digital network, is a system of digitizing phone networks which has been in the works for over a decade. This system allows audio, video, and text data to be transmitted simultaneously across the world using end-to-end digital connectivity. The original telephone system used analog signals to transmit a signal across telephone wires. The voice was carried by modulating an electric current with a waveform from a microphone. The receiving en