yet available with UNISTIM. Blame Nortel for this (and, if you're interested in the “politics” of this,see the paper Why hardware documentation matters so much and why it is so hard to get by Theo deRaadt of the OpenBSD project). However, despite these obstacles and issues, you'll see in this bookthat Asterisk with UNISTIM phones provides a totally usable telephone system!Like any other business telephone system...You will find most of the basic functions the same but, as always, “the buttons are in a different place,”meaning that you may have to learn some new ways of getting the phone to work for you. This guidewill help you find your way around. In the process you'll be learning some things that apply to anytelephone set using the Asterisk PBX as well as some things that only apply to this particular type oftelephone set; I'll try to help you keep those straight so that if your telephone set gets replaced lateryou'll know which skills you can take with you (some of the other phone sets are not yet as welldocumented on Asterisk).4 Asterisk Unistim Revised 20080307Illustration 3: The i2004 in Charcoal Gray, NTDU82