6Telephony Fundamentals

CERTIFICATION OBJECTIVES

2.3    Identify Common Voice Services and Feature Sets

3.1.4 Telephone Number Mapping

Image Two-Minute Drill

Q&A Self Test

Regardless of who gets the credit, there can be no question that the invention of the telephone has changed our culture and our world. Before the telephone, all communications required either signaling methods that demanded human encoding on the transmission end and human decoding on the receiving end, or written messages that had to be transferred by humans from place to place over long distances. The telephone, for the first time, introduced the potential to speak to other humans ...

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