<context name="default">
<extension name="ext">
<condition field="destination_number" expression="^(\d+)$">
<action application="bridge" data="sofia/internal/$1%${domain_name}"/>
HOW TO RUN THIS ACTION, ONLY IF THE ABOVE BRIDGE FAILS (THE DST NUMBER IS NOT AN EXTENSION OF A REGED USER)?
<action application="bridge" data="sofia/external/$1@${host}"/>
</condition>
</extension>