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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Dialog matching
OpenSIPS has to match all the sequential requests to a specific dialog. To perform this task, it usually applies a cookie (DID). This cookie is present in the Record-Route headers for initial requests and the Route headers for sequential requests. Let's take a look at the following example for an INVITE and its corresponding sequential request, BYE:
- Initial request:
INVITE sip:5551212@1.1.1.1:5060 SIP/2.0 Record-Route: <sip:2.2.2.2:5060;lr;did=0db.28e94f74>
- Sequential request:
BYE sip:5551212@2.2.2.2:5060 SIP/2.0 Route: <sip:1.1.1.1:5060;lr; did=0db.28e94f74>
If, for some reason, the client is broken and does not insert the Route headers correctly with cookies, you will have to fall back to a pure SIP dialog matching based on call-id ...
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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.
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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.