... service; 2,professional OEM/ODM service, 3,Date/Fax/Voice MODEM. Description:Date/Fax/Voice MODEMFeatures:l 56kbps data/fax/voice ... -T V.32bis, V.32 ITU-T V.22bis, V.22 ITU T V.23, V.21l Fax Protocol:ITU-T V.17, V.29, V.27ter, and V.21 ... or RTS/CTSl Data compression: V.44/V.42bis and MNP5l Protection circuit: internal arrester circuitl Modem on holdl Quick connectionl PCM UP ...