If the installation goes smoothly, but you get a 'No Dialtone' response from the modem, 
you might be able to fix it by changing the BIOS Plug-n-Play settings: 
select "non-PNP OS" or "Other OS" rather than the (probable default) "PNP OS" or "Windows."

Check also if the modem has a nonzero IRQ value by issuing the command:
	 lspci -vv 
and looking for your modem card in the output. 
On some Systems, this is affected by the PNP choices.