US Robotics USR5633A 56k External V.92 USB Fax Modem
Best Buy: U.S. Robotics 56K V.92 External Data/Fax Modem USR5686E
Amazon.com: USB 56K Voice Fax Data External V.90 V.92 Modem With Dual Ports, Compatible With Windows 98SE/2000/ME/XP/Vista/Win 7 and Support Auto-Dial, Tone and Pulse Dialing, Auto Answer, Auto Retrain (Black Color) :