If you’re currently on an ISDN contract, you don’t need to do anything at the moment. But, be mindful that when your contract is up for renewal, you’ll probably need to switch to a hosted telephony solution.
However, if you’re looking to upgrade and futureproof your business now, you’ll need to ensure you’ve got a business-grade broadband solution and you’ll need to assess your hosted telephony options to make sure you’re getting the most out of your services.