January 2016
Intermediate to advanced
384 pages
8h 6m
English
book
Building Telephony Systems with OpenSIPS - Second Edition
by Flavio E. Goncalves, Flavio E Goncalves, Bogdan-Andrei Iancu
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The INVITE authentication sequence
Here is the INVITE authentication sequence of an ordinary call. The proxy server always answers the first INVITE message with a reply containing the 407 Proxy Authentication Required message. This message has the Authorization header field, which contains information about the Digest authentication, such as realm and nonce (nonce is a number used once in the authentication process and it prevents replay attacks). Once received by UAC, this message is replied with a new INVITE. Now, the Authorize header field contains the Digest calculated using the username, password, realm, and nonce with the MD5 algorithm. If a match exists between the Digest informed in the request and the one calculated in the server using ...
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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.