June 2005
Intermediate to advanced
502 pages
21h 48m
English
Content preview from Switching to VoIP
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12
Chapter 2
CHAPTER 2
Voice over Data: Many
Conversations, One Network
Conversations are the basis of human communication. Conversations can be spo-
ken, written, or gestured. Conversations can even be one directional, such as a coach
bawling out his star quarterback after an uncharacteristic interception. Conversa-
tions may be “one-to-many” (such as a political candidate giving a stump speech) or
“many-to-one” (such as a constituency lobbying that candidate after she’s in office).
Conversations are more than just an analogy for networks—they literally are mod-
ern networking.
The underpinnings of enterprise networks are also conversations. IP data networks
run on protocols that use a conversational approach to data exchange. The most
common protocols for web browsing (HTTP) and email (SMTP) use a two-way
“data conversation” in order to communicate. The process is simple: a client host
sends an inquiry to a server host or a peer host, and then the server or peer sends a
response back to the client.
Conversations between hosts on an Internet Protocol (IP) network are similar to
those between people, except that instead of using words, the messages are commu-
nicated across the networks using units called datagrams. A datagram is like a letter
in an envelope. Once it has the proper markings, ...
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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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.