The model number is from Hawkings Technologies. Their name does not appear on the unit, but must refer to a 56K modem with 14400 fax. It identifies itself to Windows 9x as
Rockwell RC56D2 Serial PnP V.90, K56Flex, voice, speakerphone.
This chip was probably used by other manyfacturers.
I searched here for an RC56D2 driver, and did not find one that worked. In fact, they caused Windows Protection Error shutdowns. This one is from the Hawking Download site.
I have no manual, so don t know how to use the modem as a speakerphone.