Try an lspci as root to see what it identifies the modem as to be certain what linux sees it as then do a google search, thats what i did for my modem i never use it but it was a good learning experience.
bash-2.05b# lspci | grep Modem
02:0b.0 Communication controller: Conexant HCF 56k Data/Fax/Voice/Spkp Modem (rev 08)
Brian
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