IP telephony in general has one major weakness: faxes. Every service provider has their own solution to this dilemma, ranging from “don’t use them” to very elaborate Integrated Access Devices (IADs) that they install on your premises with analog ports that can support fax machines. In many cases, it’s actually wise to keep a single traditional PSTN line in order to run faxes and make emergency calls if for some reason your power goes out or your Internet connection is otherwise unavailable. Alternatively, consider moving to an Internet Fax Service and say goodbye to that old fax machine!