July 2017
Intermediate to advanced
434 pages
12h 59m
English
Content preview from FreeSWITCH 1.8
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"Preprocessor" Variables
Those are the variables indicated by the syntax $${varname}. In a way, those are not actual variables, but they act as read-only ones. You assign them in one of the FreeSWITCH configuration files (/usr/local/freeswitch/conf/vars.xml), and then they are literally substituted at startup when encountered. This is exactly the same as the #define construct in C preprocessor, or a "Find and Replace" command in a text editor.
<X-PRE-PROCESS cmd="set" data="hold_music=local_stream://moh"/>
In this example, by editing the vars.xml configuration file you alter the value that will be substituted in all configuration files (dialplan included) when "$${hold_music} " is encountered. If you then write in dialplan:
<action application="set" ...
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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.