Fire an event on successful sms delivery, as well as clearify if the delivery method was blocking or not.

src/mod/applications/mod_sms/mod_sms.c

@@ -50,6 +50,9 @@ static void event_handler(switch_event_t *event)
 		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Delivery Failure\n");
 		DUMP_EVENT(event);
 
+		return;
+	} else if ( check_failure && switch_false(check_failure) ) {
+		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "SMS Delivery Success\n");
 		return;
 	}