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 states
A dialog can assume several states. The dialog state is present in the $DLG_status variable. The values can be as follows:
NULL: Not found1: Unconfirmed (INVITE sent but no reply received)2: Early state (INVITE sent and provisional reply received, 100,180,183)3: Confirmed (INVITE sent, 200 OK received, no ACK)4: Established (INVITE sent, 200 OK received, ACK confirmed)5: Ended (BYE received)
It is very useful to check the dialog state before taking any action such as reading dialog variables. If the dialog is NULL, a dialog variable and/or flag is not readable.
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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.