By a used Definity Prologix by Avaya. (don't buy a Definity ONe or IP600).The are very reliable and u can do the programing from your desk on your computer. There are lots of used phones and equipment out there and 24 hour support. Just put in "Definity" in ebay and see all the equipment online. (Disclosure ::I don't work for ebay or Avaya, although I have lots of Avaya stock.)
David
P.S. And a message to all posters,if you want to get the best response to a question, please read FAQ222-2244 first. Please also give the type and version of your system and preview your post to clear up and correct English mistakes. In addition, if I ask a question in a reply to a post, and that question is not answered, then I usually w