Chapter 2 Introducing the i2004 Internet Telephone 15i2004 Internet Telephone User Guide[Standard—Nortel Networks Confidential]Some useful terms you should knowThe i2004 Internet Telephone may look like a regular telephone but there aresome important differences that you need to keep in mind.Multiple user logonYour i2004 Internet Telephone can support up to 6 lines. That means that 6different people can log on to a single i2004 Internet Telephone to receive andplace calls. The first person who logs on to the telephone has the primary line.You can also be logged on to several different i2004 Internet Telephones at thesame time. If you have a job function that requires you to move around to differentlocations then you can always be sure that your calls will reach you.Some menu options allow you to configure or view parameters that are specific toa line. If there are multiple users logged on to the telephone then you will beprompted to select your line button.What is an address?When you enter an address to call someone, that can mean entering; a telephonenumber or a SIP address. A SIP address is a unique identifier of users on the IPnetwork. It has the same format as an email address, for example, jdoe@lab1.org,but it is not an email address. The characters before the @ sign represent theusername, in our example, jdoe. The characters after the @ sign represent thedomain name of the server, in our example, lab1.org. If you are located in thesame domain as the user you are calling then you do not need to enter the domainname part of their SIP address (@lab1.org).The network can track where you are and route your calls when you log into anyi2004 Internet Telephone with your SIP address. Using SIP addresses allows youto take advantage of the other powerful features such as Presence.In order to make it easier to place calls, you can store addresses (SIP addresses ortelephone numbers) in an address book.