SP3008UBV4 1xRJ11 + 1xUSB V.92 Lite, V.90, V.34, V.32bis, V.32, V.22bis, V.22, V.23, and V.21, Bell 212A and Bell 103 modulation modes Quick connect V.44 data compression for optional downloading of Internet Web pages and files V.42 bis and MNP 5 data compression V.42 LAPM and MNP 2-4 error correction V.17, V.29, V.27ter, and V.21 channel 2 EIA/TIA 578 Class 1 and T.31 Class 1.0 commands Support Telephone Answering Machine (TAM) AT Command Set Support Windows 98SE/ME/2000/XP/Vista 32 bit