public function getVoiceConsumptions($params = null)
    {
    	$consumptionList = json_decode(self::getClient()->getVoiceConsumptions($this->service, $this->billingAccount, $params));
    	$consumptions = array();

    	foreach ($consumptionList as $consumption) 
    	{
    		$consumptions[] = new VoiceConsumption($consumption, $this);
    	}
    	return $consumptions;
    }