private function getDncChannelName($key)
    {
        if (!$this->dncChannels) {
            $this->dncChannels = $this->getContactModel()->getPreferenceChannels();
        }
        if ($key) {
            if (isset($this->dncChannels[$key])) {
                return $this->dncChannels[$key];
            } else {
                return ucwords($key);
            }
        }

        return '';
    }