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 ...
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