The kx tgp550 brings together all the advantages of modern internet hd voip voice calls classic business phone functionality and easy web based administration ideally suited to small of and branch office solutionsplease note that this product is for use with a voip line only and will not work on a standard telephone line the kx tgp550 series is a high specification hd voip voice phone business phone functionality and web based administration suited to soho and branch offic