Well 10x... the greatest pitty is that my modem is in a fact supported by linmodem drivers. According to scanmodem utility:

Class 0780: 11c1:0442 Communication controller: Lucent Microelectronics 56k WinModem (rev 01)
...
The modem has a supported Lucent/Agere DSP (digital signal processing) chipset
with primary PCI_ID: 11c1:0442