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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SIP session timers
One of the main issues with SIP is to make sure that the call and dialog finishes properly. However, in the SIP protocol, there is no guarantee that either the UAC or UAS will send the BYE request to terminate the call. Network and device issues can lead to unfinished calls. These calls, also called hanged calls, will stay in the dialog table until its default timeout, by default, 43,200 seconds or, in other words, 12 hours. This time is changeable in the default_timeout parameter.
The Internet Engineering Task Force (IETF) defined a mechanism to detect hanged calls and lack of communication with a specific device. It is now a standard described in RFC 4028. The SIP session timers send periodic messages that continuously update ...
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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.