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 Voice Networking 101

Welcome to the wild and wonderful world of voice networking! How do phones work? How do telephone calls get routed? What’s a PBX? All of these questions and more are answered herein.

An everyday part of life that is taken for granted, voice networking is no easy matter. If it was, everyone would be doing it! There are countless numbers of specifications that apply. But with any specification or standard, it is ultimately the reader’s interpretation of the standard that counts.

Jared’s third law of voice networking applies: For every standard, there is an equally opposing standard! These are my interpretations of these standards, coupled with my knowledge and experience gained over the years.

• Acknowledgements
• Introduction
• References and Standards
• Other Useful References
• The Telephone
• The US Public Switched Telephone Network
• Phone Numbers and Dial Plans
• Two-Wire and Four-Wire Transmission
• Trunk Signaling Methods
• The Private Branch Exchange (PBX)
• The Echo Problem
• Echo Control Techniques and Requirements
• Loss Planning and Guidelines
• Voice Digitization Methods and Techniques
• Digital Signaling Systems