... .Use conexant chipset ZBT-UM03B is 56k Data/Fax soft Modem, supports ITU T V.92. ... Windows XP,VIST,WIN7,Linux. 1. 56k Data/Fax modem with USB interface2. Compliant with V.90 ... data download,48K data upload and 14.4K fax communication5. Provide quick connect and Modem-on-Hold ... Caller ID and distinctive ring detect,Auto format.speed sensing8. Data/Fax/Voice call discrimination,Single configuration profile ...