... ; 3. Support Skype, MSN, QQ, Google Talk, AIM, Yahoo ! Messenger , X-Lite,X-pro,VoipBuster,VoipDiscount,VoipCheapCom,VoipCheap, VoipStunt,SparVoip,InternetCalls,NetAppel,Poivy ... . No external power required 10. Complies with H.323, MGCP, SIP protocol; 11. Echo cancellation, noise reduction; 12. Application support:Skype ...