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so</b> file extension, which live in the Asterisk modules directory (which =
is typically <b>/usr/lib/asterisk/modules</b>). When Asterisk starts up, it=
 loads these files and adds their functionality to the system.</p>

<div class=3D'panelMacro'><table class=3D'tipMacro'><colgroup><col width=3D=
'24'><col></colgroup><tr><td valign=3D'top'><img src=3D"/wiki/images/icons/=
emoticons/check.gif" width=3D"16" height=3D"16" align=3D"absmiddle" alt=3D"=
" border=3D"0"></td><td><b>A Plethora of Modules</b><br />Take just a minut=
e and go look at the Asterisk modules directory on your system. You should =
find a wide variety of modules. A typical Asterisk system has over one hund=
red fifty different modules&#33;</td></tr></table></div>

<p>The core also contains the dialplan, which is the logic of any Asterisk =
system. The dialplan contains a list of instructions that Asterisk should f=
ollow to know how to handle incoming and outgoing calls on the system.</p>

<p>Asterisk modules which are part of the core have a file name that look l=
ike <b>pbx_xxxxx.so</b>.</p>
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