The first application we will discuss is the voicemail application. This application is useful to add right after the bridge application as a second option, executed in cases where the call was not completed. We can do this with one of those special variables that we were discussing earlier. Let's look at a version of our last extension that also allows us to leave a voicemail:
<extension name="example 4">
<condition field="destination_number" expression="^2000$">
<action application="set"
data="hangup_after_bridge=true"/>
<action application="bridge" data="user/2000"/>
<action application="voicemail"
data="default ${domain} 2000"/>
</condition>
</extension>
Here, we see two uses of channel variables. First, we set hangup_after_bridge=true ...
