RingRx’s philosophy is to offer the highest quality deskphones at the most competitive prices. We are so determined to give you the best audio experience, we only interface with select manufacturers and models. It is also why we include the price of deskphones with our service (select plans only). If you already have a model and you would like to see if we are able to use it, please contact us at firstname.lastname@example.org. We will need to know the manufacturer and model.