Building voice applications

Now that we have covered the basic Lua syntax, let's create a simple Lua script and the corresponding entry in the Dialplan. First, create a new Dialplan extension that will execute the Lua script when a user dials 9910:

1. Open the 01_custom.xml file that we created in Chapter 5, Understanding the XML Dialplan, and add the following new extension:

   <extension name="Simple Lua Test">
     <condition field="destination_number" expression="^(9910)$">
       <action application="lua" data="test1.lua"/>
     </condition>
   </extension>

2. Save the file, launch fs_cli, and issue reloadxml, or press the F6 key:

   Our Dialplan is now ready to call the Lua script named test1.lua. Create this new script as follows.

3. Using your text editor, create the test1.lua script in the freeswitch/scripts/ directory, and add the following code lines:

   -- test1.lua
   -- Answer call, play a prompt, hang up
   -- Set the path separator
   pathsep = '/'
   -- Windows users do this instead:
   -- pathsep...