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Description:USB 1.1 & 2.0 built in sound; Supported Operating Systems are Win98 SE , ME , 2000 , XP and Fedora Core Linux 3; Echo cancellation and Noise reduction;Full Duplex; Calling Capabilities - PC to PC and PC to Phone operation ;Caller ID function of VoIP calls, 199 incoming call and 199 dialed number; Complies with H.323, MGCP, SIP protocol; No external power required