If you specifically need the drivers for the PC-Tel HSP56 Modem (which often handled telephony audio):
Struggling to find a working HSP56 sound card driver link ? This detailed guide explains what the HSP56 is, why drivers are hard to find, and where to download them safely for Windows 10, 11, and older OS. hsp56 sound card driver link
To locate the correct driver, first identify the device via Windows Device Manager or Linux lspci : If you specifically need the drivers for the