USB VOIP Phone Adapter, Support SIP, Skype This is a very easy to use USB VoIP Phone Adapter Plug your USB cable to the PC and the other end to the adapter Whenever you can go on-line, you can make VoIP Phone call Make, receive both VoIP calls and PSTN regular calls simultaneously One USB interface to PC One RJ11 interface to PSTN One RJ11 interface to fax or normal phone