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
Content preview from Building Telephony Systems with OpenSIPS - Second Edition
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SIP transactions and dialogs
It is important to understand the difference between a transaction and dialog because we will use this ahead in OpenSIPS scripting. For example, there are attribute value pairs attached to transactions and dialog variables attached to dialogs. If you can't recognize a dialog and variable, it will be hard to configure the SIP server.
A transaction occurs between a user agent client and server and comprises of all the messages from the request to the final response (including all the interim responses). The responses can be provisional, starting with one followed by two digits (for example, 180 Ringing) or final, starting ...
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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.