Freeswitch dials extension number source code tracking

 

summary

freeswitch Is a very easy to use open source VOIP Softswitch platform .

We have introduced the use of fs How to dial the extension number , The code flow is relatively complex , So I will open a separate chapter to introduce .

fs Dial the extension number , It's using send_dtmf Interface implementation , This section mainly introduces how interfaces integrate DTMF Code sent , What modules have been passed .

Environmental Science

centos：CentOS  release 7.0 (Final) Or above

freeswitch：v1.8.7

GCC：4.8.5

Dial plan

fs The configuration file /usr/local/freeswitch/conf/dialplan/test.xml

<include>

        <context name="ext_test">

                <extension name="test" continue="false">

                        <condition field="destination_number" expression="^(\d+)$">

                                <action application="sched_hangup" data="+10"/>

                                <action application="send_dtmf" data="1234"/>

                               <action application="sleep" data="5000"/>

                     <action application="endless_playback" data="/usr/local/freeswitch/sounds/101-baidu-mp3.mp3"/>

                        </condition>

                </extension>

        </context>

</include>

Source code flow

chart 1,“FS CORE” yes freeswitch Core module ,“mod_dptools” and “mod_sofia” yes fs Sub module of .

 

because dialplan The process in is first “send_dtmf”, then “sleep”, So from the above call flow chart , You can see that the starting point of the process is mod_dptools Module start .

summary

freeswitch There are many processes and sub modules of the core module , Calling and registering callback functions between modules are complex , Variable process .

Sorting out sub module function code flow is helpful to understand fs The overall structure of .

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