Proprietary Server and Clients of Choice Fax servers today are more or less tied to the software delivered with them, at least on the server side. A Choice of Proprietary Fax Engines You'll need to figure out the architecture for your fax server at some point. Each architecture has its advantages and disadvantages. Make sure that you select the product that works for you today as well as tomorrow. There are a number of products available for the networked personal computer acting as the fax server.
Configuration can be troublesome.
On the other hand, this architecture has the largest number of products available. Once configured, the devices just seem to hum along. There's not much in the way of setup to do. In some cases, it's as little as entering the serial number of the unit into a configuration program. The flip side of the coin is that there are only a few of these devices on the market, so choices become more limited.