July 2006
Beginner
432 pages
9h 6m
English
book
Voice over IP Fundamentals, Second Edition
by Jonathan Davidson, James Peters, Manoj Bhatia, Satish Kalidindi, Sudipto Mukherjee
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Chapter 2. Enterprise Telephony Today
Enterprise Telephony (ET) is a business telephone system that provides basic business features, such as call hold, three-way calling, call transfer, and call forwarding. ET shares many similarities with the Public Switched Telephone Network (PSTN), but there are many key differences. This chapter details both the similarities and differences between these two networks, the ways in which they interoperate, and typical ET network designs.
Similarities Between PSTN and ET
The PSTN and ET are similar in the following ways:
Circuit Switching—Both networks are based on the time-division multiplexing (TDM) switching of 64-kbps circuits.
Common Infrastructure Model—Bearer channels, call-control, and service planes are ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.