Skype usb phone 1.rational structure, beautiful appearance. 2.independently developed 3.reliable quality 1. PC-to-PC and PC-to-phone ... , SIP protocol; 6. Echo cancellation, noise reduction; 7. Support Skype, UUcall, Alt, QQ, MSN, Talk, Yahoo, Sip Discount, X ... RAIDER, VoipWise Onet2phone; 8. Full duplex communication; 9. Support Skype speed-dialing function; 10. Key-in tone function. Skype USB Phone