protected function _mapFieldName(\App_ListFilter_Interface $filter, \App_ListFilter $filterList)
 {
     if ($filter instanceof \App_ListFilter_BetweenFilter) {
         if ($filter->getFieldName() === StockFilterFields::ICC) {
             return 'icc_range';
         }
         if ($filter->getFieldName() === StockFilterFields::IMSI) {
             return 'imsi_range';
         }
         if ($filter->getFieldName() === StockFilterFields::MSISDN) {
             return 'msisdn_range';
         }
     }
     return parent::_mapFieldName($filter, $filterList);
 }
 protected function _mapFieldName(\App_ListFilter_Interface $filter, \App_ListFilter $filterList)
 {
     if ($filter instanceof \App_ListFilter_BetweenFilter) {
         if ($filter->getFieldName() === SimFilterFields::STATIC_IP) {
             return 'static_ip_range';
         }
         if ($filter->getFieldName() === SimFilterFields::CURRENT_IP) {
             return 'current_ip_range';
         }
     }
     return parent::_mapFieldName($filter, $filterList);
 }