I am having my system with the DIDs assigned on each extension for the incoming calls.
My /dialplan/public has the following structure:
<include>
  <extension name="public_did">
    <condition field="destination_number" expression="^(2109065738)$">
           <action application="set" data="domain_name=$${domain}"/>
           <action application="transfer" data="1020 XML default"/>
    </condition>
  </extension>
</include>

I would like this DID to reach

I would like to have the one DID to reach 3 extensions simultaneously 1020-22
<include>
  <extension name="public_did">
    <condition field="destination_number" expression="^(2109065738)$">
           <action application="set" data="domain_name=$${domain}"/>
           <action application="transfer" data="1023 XML default"/>
    </condition>
  </extension>
</include>

and a 2nd DID to call an extension(1023) and after 10secs to call another extension(1024) and after 10 secs make an outgoing call to a particular mobile number(69400700123)


Thanks in advance,