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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Validating a dialog and fixing broken dialogs
One of the most useful features of the dialog module is the dialog validation. There are some cases where this can be very useful. It can prevent malicious BYEs to close dialogs without disconnecting the call causing billing problems and other injected in-dialog requests. The function used to perform dialog validation is validate_dialog() and the result codes are displayed here:
1: Dialog exists and is valid-1: Invalid cseq-2: Invalid remote target-3: Invalid route set-4: Other errors (parsing, no dlg, and so on)
There are cases where a UAS sends a reply with invalid information in the headers. You can fix these headers based on the dialog information stored in the memory using the fix_route_dialog() ...
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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.