[Freeswitch-users] how to get the gateway name which the call is using

Hello My dialplan like this: <extension name="test"> <condition field="destination_number" expresion="^(100)$"> <action application="bridge" data="sofia/gateway/gw/100|sofia/gateway/gw1/100"/> </condition> </extension> I want to know which gateway was using by the call, gw or gw1? is there any variables to use? Thanks!