soft client
n.— «Three of those options, the VoIP, cell and desktop computer phone (a “soft client” in the parlance of geekdom), have the option of picking any area code I want the receiving party to see.» —“Really, what’s so crucial about three new digits?” by Gene Grant Albuquerque Tribune (New Mexico) Aug. 1, 2006. (source: Double-Tongued Dictionary)