Howto:Getting started with your own PBX voicemail script

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The innovaphone voicemail is implemented as an XML script running in a PBX Voicemail object. While this is a pretty complete implementation of a voice box, it is possible to modify the script or even write your own scripts. Here is how to start.

Voice mail scripting is a quite powerful tool. Please note that "voice mail script" is rather a misnomer. You can support a variety of applications using this scripting language, not only voice mail.

Applies To

This information applies to

  • All V6 and later PBX Platforms

More Information

System Requirements

The PBX voicemail object provides an interpreter for an XML based scripting language. This language is defined in a XML schema file vm.xsd and a documentation is available in vm.htm. Both files can be found in the schema folder in the voicemail application download package on the download page (beware: you must download the full "vm" package, not a single language package only).

To start your own voice mail derivative, just

  • copy vm.xml (found in the \drive\CF0\VM\en|de) in your voicemail installation to a new name
  • change the URL in the voicemail configuration page to point to the new script
  • make the required changes to your new xml copy

To interface the voicemail to other web based applications (such as php or asp scripts on your web server), have a look at the exec tag in vm.htm.

Editing your xml file

Editing your xml script is much easier if you use a dedicated xml editor that is capable of reading the corresponding xml schema file (vm.xsd).


There is a predefined structure like this example:

<?xml version="1.0" encoding="utf-8" ?>
  <function define="Main">
    <!-- some stuff -->

You will find a global voicemail tag. Within this tag you can define your own functions.
If the script is executed the Main function will be executed automatically.

The Voicemail XML documentation can be found in

XML helper functions

There is not a native method for every logical operation. Here are some helper functions where no native method exist.

disconnect control calls / calls without media

<!-- check if the incoming call was a control call without audio, eg. a presence call -->
<pbx-getcallinfo out-ctl-call="$ctl_call" />
<if cond="$ctl_call">
  <dbg string="disconnect control call" />
  <pbx-disc />

encode asterisk

The lib-enc method does not encode "*" in a string.

<function define="encode_asterisk">
  <!-- expect existing variable called $string_encode_asterisk -->
  <assign out="$string_position" value="1" />
  <assign out="$string_position_finished" value="0" />
  <assign out="$string_encode_asterisk_tmp" value="" />
  <lib-strlen string="$string_encode_asterisk" out="$string_length" />
  <while notcond="$string_position_finished">
    <index out="$res" value="$string_encode_asterisk" pos="$string_position" size="1"/>
    <switch var="$res">
      <case equal="*">
        <lib-strcat out-string="$string_encode_asterisk_tmp" string="$string_encode_asterisk_tmp" string2="%2a"/>
        <lib-strcat out-string="$string_encode_asterisk_tmp" string="$string_encode_asterisk_tmp" string2="$res"/>
    <add value="$string_position" value2="1" out="$string_position" />
    <switch var="$string_position">
      <case greater="$string_length">
        <assign out="$string_encode_asterisk" value="$string_encode_asterisk_tmp" />
        <assign out="$string_position_finished" value="1" />

remove first char

<function define="remove_first_char">
  <!-- expect existing variable called $string_remove_first_char -->
  <lib-strlen string="$string_remove_first_char" out="$file_length" />
  <sub value="$file_length" value2="1" out="$file_length" /> 
  <index out="$string_remove_first_char" value="$string_remove_first_char" pos="2" size="$file_length"/>

Related Articles

The most current VoiceMail XML language documentation can be found in vm.htm on