If you have not done it yet, maybe it's time to say goodbye to the old fax machine. Technology has gone a long way lately that having a fax machine is somewhat useless. There are many other devices that can take its place and in the long run, you will probably save money on wasted ink, paper, and other maintenance supplies.
If you have not done so you should review the annual cost of maintaining your fax machines and weigh out the overall costs by using an alternative replacement. The technology is quite old and maybe it's time you upgrade.