February 2013
Intermediate to advanced
242 pages
6h 19m
English
Content preview from Packet Guide to Voice over IPBecome 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,
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.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.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.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.
Chapter 4. The Real-Time Transport Protocol and the Real-Time Control Protocol
RTP is a protocol framework that is deliberately not complete. This document specifies those functions expected to be common across all the applications for which RTP would be appropriate. Unlike conventional protocols … RTP is intended to be tailored through modifications and/or additions to the headers as needed.
—RFC 1889
VoIP endpoint registration, setup, number dialing, media sessions and features are all governed by the VoIP signaling protocol. Probably the most common signaling protocols in use today are the Session Initialization Protocol (SIP), H.323 from the International Telecommunications Union–Telecom (ITU-T), and the Skinny Client Control Protocol (Skinny) from Cisco. These three protocols could not be more different from each other. But, despite these differences, they share the need to transport voice data from one phone to another, and they all use the same method—the Real-Time Transport Protocol, or RTP. While RTP is used on almost every standardized Voice over IP deployment, its malleable nature allows it to be expanded or modified to suit future media streams and codecs.
This chapter will describe the operation of RTP and provide several examples of packets captured on an operating VoIP network. Mixed in with the RTP packets, we will also see another protocol—the real-time control protocol (RTCP), which provides feedback regarding the quality or performance of the RTP stream. One challenge ...
Become 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,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.