A Quick Introduction to Voice over Internet Protocol (VoIP)


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Internet Basics

The basic building block of networks is the IP datagram.
Analogy to datagrams—a postcard with
Destination address
Return address
A small amount of text
A postcard might inform you of a friend’s holiday travels or remind you of a dentist’s appointment.
The postal service doesn’t care which application (friend or dentist) sent the postcard—it just carries processed wood pulp with black marks.

Voice—Another Application over IP

Voice requires about 10,000 to 100,000 bits per second.
Can send those bits over IP—just as we send web pages or email.

Concluding Thoughts

VoIP is one of many higher-level communications capabilites among devices connected to the Internet.
VoIP is not an application.
VoIP is a capability that is part of many applications.
VoIP capabilities are already pervasive.
Microsoft Windows Messenger (part of XP)
AOL Instant Messenger
Xbox and Sony Playstation.