The SA2532 is a CMOS integrated circuit that contains all the functions needed to form a high performance electronic telephone. The device incorporates LD/MF dialling, melody generation, ring frequency discrimination and a high quality speech circuit. A RAM is on chip for a 31 digit last number redial. The sliding cursor procedure makes Last Number Redial easy behind a PABX. The versatility of the circuit is provided by on chip programmability and a few external components. This allows easy adaption to different PTT requirements without changing the PCB of the telephone.