56K External USB Fax Modem, Fully Complies with ITU V9.2/K56Flex 5,600bps ... .22bis , V.22 , V.23 , V.21 , Bell212A , and 103 Fax protocol: V.17, V.29, V.27ter and V.21 ... channel 2 fax protocol, fax speed up to 14,400bps Data error correct: V.42 ...