name:         HT9320K
function:     22-Memory Tone/Pulse Dialer
package:      DIP28,28
manufacturer: Holtek

     +--()--+
 C8B | 1  28| C7B
  KT | 2  27| C6B
 R1B | 3  26| C5B
 R2B | 4  25| C4B
 R3B | 5  24| C3B
 R4B | 6  23| C2B
 R5B | 7  22| C1B
HKSB | 8  21| POB
  NC | 9  20| HFO
 HFI |10  19| XMUTEB
MODE |11  18| DTMF
  X1 |12  17| HDIB
  X2 |13  16| HDO
 VDD |14  15| VSS
     +------+


This pinout came from the Chipdir:
http://www.chipdir.org/