Or get a VOIP capable DECT base station and DECT handsets. Such as the Gigaset N300 IP. That can handle 6 VOIP accounts and a POTS line. That's what we have and works well. Wired ethernet to the base station, currently three DECT handsets wirelessly conected to that. You can select which handset(s) ring for a given incoming VOIP call and have different ringtones. Normal DECT paging and intercom facilties of course.