Product Description: QTM-56I is a 56k Data/Fax soft Modem which is support to ITU T V.90. This Modem can be used in the following Operating System: Windows98, Windows ME, Windows NT, Windows 2000 Windows XP and Linux. Features Data mode capabilities: ITU T V.90, 56Kbps ITU T V.34, 33600 to 2400 bps ITU T V.32bis, V.32 ITU T V.22bis,V.22 ITU T V.23, V.21 FAX mode capabilities: ITU T V.17, V.29, V.27ter, and V.21 Ch 2 Group3 FAX Caller identification (caller ID, based upon V.92) V.42 and NMP2-4 error correction (LAPM and MNP) V.42bis and MNP class 5 data compression Operating system support: Windows 98, ME, NT, 2000, XP and Linux EIA / TIA 578 class 1 standard for AT command set