PCTEL 2303 (HSP56 AMR MicroModem)

Chipset data:

PCTEL, datasheets:
AMR bus soft (HSP) modem
Linux support
PCTEL refers all support requests to their OEM customers. However, they have produced a number of Linux drivers to be distributed by these modem manufacturers. A collection of these drivers can be found on Jan Stifter's Unofficial PCTEL modem for Linux site.
  PCT303A  AC'97 interface                       16-pin SOIC
  PCT303L                                        16-pin SOIC
  PCT303W  CODEC/World DAA phone-line interface  16-pin SOIC

  PCT2303N = PCT303A + PCT303L
  PCT2303W = PCT303A + PCT303W
Rob Clark