June 2005
Intermediate to advanced
502 pages
21h 48m
English
Content preview from Switching to VoIP
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SIP
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149
SIP
The Session Initiation Protocol (SIP) was developed by the Internet Engineering Task
Force as a way of signaling multiuser distributed telephony and messaging applica-
tions on an IP network. SIP has garnered much praise from IT professionals, while
suffering some criticism from traditional telecommunications people. The main rea-
son for its less-than-perfect repute with telecom pros is its origin outside the telecom
world. But many telecom guys have had to forgive this, because they’re learning that
SIP has almost no shortcomings when compared to its ITU-inspired cousin.
The essential duties and formulaic pieces of SIP are the same as H.323. That is, there
are VoIP endpoints of varying capabilities, and there are servers that participate in
the signaling process and establish policy for the voice network. Unlike H.323, how-
ever, SIP is far more extensible. It is more than just a set of voice and video tele-
phony protocols. Rather, it’s a packaging framework for all types of message-based
applications, from intercom calling to instant messaging and AV services.
Companies like Broadvox, Voicepulse, Broadvoice, Packet8, and others have
emerged as frontier providers for dial-tone–style services delivered over the Internet,
using SIP as the signaling system. Under these service ...
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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.