/**
  * Return a description of the subscription rate such as $10 / 1 month
  * 
  * @return string
  */
 public function getSubscriptionPriceSummary()
 {
     $desc = '';
     if ($this->isSpreedlySubscription()) {
         $subscription = new SpreedlySubscription();
         $subscription->load($this->spreedlySubscriptionId);
         $desc = $subscription->getPriceDescription();
     }
     return $desc;
 }