[Freeswitch-users] Result of an application...

Hi, maybe a stupid question, but how can I find out the result of an application? If I do (in perl) $session->execute("bridge", "user/${DestNr}\@$VARS{domain}"); How do I know if this was successful or if the user was busy or if the phone doesn't exist? Is there any status variable for the result of an execute (or even any other command)? Thanks, Klaus