July 2002
Intermediate to advanced
528 pages
15h 13m
English
Content preview from Practical VoIP Using VOCALBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 7. Session Initiation Protocol and Related Protocols
This chapter provides a technological overview of the Session Initiation Protocol (SIP) that focuses on its ability to enable VoIP. If you take the time to read the SIP standard, Request For Comments (RFC) 3261, you will notice that SIP can do much more than set up basic calls. Rather than writing an exhaustive reinterpretation of the normative statements found within the standard, it seems more useful to explain SIP in its simplest form. After reading this chapter, you should be able to read through a SIP call flow, interpret a log of the message text, and gain some new insight into some of the activity that transpires within VOCAL when users pick up their IP phones and call one another. If you are already familiar with SIP, you may want to skip ahead to Chapter 8 where we discuss the data structures found within the Vovida SIP stack.
While most of the facts covered in this chapter will remain static for a long time, there is always a potential for change. The Internet Engineering Task Force (IETF)’s web site, http://www.ietf.org, is your best source for keeping up with the latest RFCs and drafts. Refer to RFC 2026 for an explanation of the Internet standards process.
What Is SIP?
SIP is a rendezvous protocol for finding users and setting up and modifying multimedia sessions. VoIP is only one of many possible applications for SIP. In our initial discussion of SIP message flows, we attempt to describe SIP generically. Later ...
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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.