default.xml

<?xml version="1.0" encoding="utf-8"?>
<include>

  <context name="default">

    <extension name="localxtens">
      <!-- case SIP or E1 to 88988[00-49] route to equivalent SIP extension -->
      <condition field="destination_number" expression="^(0?9?88988[0-4][0-9])$">
        <action application="bridge" data="${sofia_contact(internal/$1@$${domain})}"/>
      </condition>
    </extension>

    <extension name="To_PSTN">
     <!-- case SIP to E1, dialing outside of 50 extensions (SIP or E1 numbers)-->
     <condition field="destination_number" expression="^(.*)$">
       <action application="set" data="effective_caller_id_number=${outbound_caller_id_number}"/>
       <action application="set" data="effective_caller_id_name=${outbound_caller_id_name}"/>
       <action application="bridge" data="openzap/1/a/$1" />
     </condition>
    </extension>
  </context>
</include>