When you use the internet you are using a connection to your ISP (Internet Service Provider) over some kind of line whether it is a phone line using a modem or a cable for a cable modem. ISDN is just another way that you connect to the internet. ISDN stands for Integrated Services Digital Network. ISDN is a digital phone connection system and is often used to give you higher and more reliable service. So, what they mean is to call your phone company and ask them to check your line, that is all they mean. Remember, the Internet itself is just a huge set of connections using an unbelievable number of types of connectivity from phone lines to space based relays and how you get there is through whatever line you have set up between you and your ISP. Does that help?
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