US Robotics's Spec Sheet
56Kbps (supports the V.92 standard - current federal regulations limit speed to 53Kbps)
V.42/MNP 2-4 error control and V.42 bis/MNP 5 data compression for throughput up to 115.2 Kbps
Supports voicemail, full duplex speakerphone, fax, caller ID and distinctive ring
Plug and Play
Requires Windows