You can actually do nothing about it and hope that the telephone system of your business will not cause any issues for you. Or you can decide to get a newer business telephone system.
Replacing your old business telephone system.
A modern business telephone system that you can get from a reputable supplier will have a really quick installation and there can be a number of configurations that you can choose from in order to provide the needs of even the smallest businesses up to the large companies.
You will not only get a more reliable telephone equipment for your office if you will buy a new telephone system, but you will also be able to participate in the up to date communications exchanges with your suppliers and customers.