... OEM logo, color, balance display, Pop Up window Preintall desktop SIP phone, OEM available, show logo, show balance 1. USB Interface PnP ... /sound card required2. High quality for full duplex communication3. With phone base and hook ability4. Built-in keypad for DTMF dialing ... call.5. Support Skype, UUcall, Alt, QQ, MSN, Talk, Yahoo, Sip Discount, X-Lite, Eyebeam, X-pro, Sipgate, IPhone, Vonage, UBIFONE ...