... usb port 1Line port,1 Phone port 2.56K Data/Fax modem 3.Support Caller ID 4.Hot Plug 5.OEM/ODM ... more effective.l Set the designated compatible hayes AT commandSpecificationl Communication protocol: ITU-TV.92 , V.90 , V.34 , V.32bis , V ... .32 , V.22bis , V.22 , V.23 , V.21 , Bell212A , 103l Fax protocol ... Humidity 5% to 90%RH no condensing 56K External Usb Fax Modem