Most of the board products in the market today are unreliable and expensive. Until them, the use of server-based solutions will be restricted to very special cases. When considering the cost of the solution, you have to analyze what are the features needed in your application. For example, you should not pay for extra scalability if you don't expect to grow above the limit of a lower-cost product. Besides the cost of the product itself, you should investigate the total cost to own and operate the solution.
Some older products have special installation requirements.
Most vendors will provide technical support and software updates only for a very limited time and will impose expensive maintenance contracts to support and update the product after that. The Cyclades-PR4000 uses newer hardware technology and has higher level of integration when compared to most of the products in the market. Because of that, the PR4000 ranks among the most cost-effective in its class. As all Cyclades products, the PR4000 comes with free and unlimited technical support and software updates. That way, it is relatively easy to change the modem software to accommodate changes in the modem standards and fix possible modem interoperability problems.