public function isValid($value, $context = null)
 {
     $this->_messages = array();
     $msisdnAvailableValidator = new App_Validate_Ericsson_MsisdnAvailable();
     if ($msisdnAvailableValidator->isValid($value, $context)) {
         $message = $this->_createMessage(self::NUMBER_NOT_EXISTING, $value);
         $this->_messages[self::NUMBER_NOT_EXISTING] = $message;
         return false;
     }
     return true;
 }
 /**
  * @param array|Zend_Config $options Options to use for this validator
  */
 public function __construct($options)
 {
     parent::__construct($options);
     if (isset($options['supplServicesId'])) {
         $this->_supplServiceIdVarInContext = $options['supplServicesId'];
     } else {
         $this->_supplServiceIdVarInContext = 'id';
     }
 }