Voice-over Internet Protocol (VoIP)

Roy Morris, Capitol College

Introduction

Communications Theory: Bits of Transmitted Information

Bits: The Most Basic Form of Information

Transmission of Voice Signals

The Characteristics of an Analog Voice Signal

Digitizing an Analog Voice Signal

The Telephony Network

The Communications Network Topology

Transmission Links

Transmission System Imperfections: Noise, Loss, and Delay

Circuit-Switched Connections of a Call in a Conventional Telephony Network

Voice-over-Internet Protocol

How Voice-over-Internet Protocol Transmission Works

Voice-over-Internet Protocol Signaling

H.323 vs. SIP

Integrating Voice-over-Internet Protocol into Conventional Circuit-Switched Telephony Networks

ENUM, the Fully Interoperable Numbering Plan

Quality-of-Service Issues

The Costs and Savings of Using the Voice-over-Internet Protocol

Security Issues for the Voice-over-Internet Protocol

Conclusion

Glossary

Cross References

References

INTRODUCTION

As with any advanced communications protocol, voice-over-Internet protocol (VoIP) brings with it many benefits along with offsetting negatives, including potential security risks and management issues. Whether provided over wire or wireless transmission, VoIP security poses unique risks and complexity. Its successful implementation requires compliance and compatibility with conventional telecommunications standards—whose basic designs date back to the early twentieth century—while it must “ride on” data transmission technologies ...

Get Handbook of Information Security, Volume 1, Key Concepts, Infrastructure, Standards, and Protocols now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.