Our company utilizes Cisco ip phones at more than 30 locations around the world. I represent a manufacturing site where we are using cisco 7911 ip phones in our production areas. The ringer for these phones cannot be heard over our production manufacturing process. Is there a solution either through Cisco or an external third party accessory(ies) that can amplify the ring tone? If you need further details, please leave an email or phone number so i can contact directly. Thanks.