[Freeswitch-users] variable not being replaced in dialplan

Good morning, i have the following entry in my dialplan to dialout using a gateway: <extension name="gw_outbound_call">         <condition field="destination_number" expression="[\d]{7,}?$">                 <action application="set" data="effective_caller_id_number=10000"/>                 <action application="bridge" data="sofia/gateway/gw/$1"/>         </condition>     </extension> the dialplan runs well and when FS has to bridge the call it opens a channel to "sofia/gateway/gw/$1", it does not replace the $1 by the actual number being dialed, i have the same in other parts of the dialplan and it works good, i can not find what i m doing wrong here, i would appreciate any hint about this issue. thanks!