add new execute_extension application to execute another extension in the current scope

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@4993 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/switch_core_state_machine.c

@@ -82,7 +82,7 @@ static void switch_core_standard_on_ring(switch_core_session_t *session)
 
 					count++;
 
-					if ((extension = dialplan_interface->hunt_function(session, dparg)) != 0) {
+					if ((extension = dialplan_interface->hunt_function(session, dparg, NULL)) != 0) {
 						switch_channel_set_caller_extension(session->channel, extension);
 						return;
 					}