Selective call protection at microprocessor-controlled telephone - involves recognition of code number sent by caller to additional receiver which may instigate alternative response

摘要

An answering machine (AB) is set so that in principle it can be switched to the subscriber line (TL) to record incoming speech and reproduce a recorded message when a calling tone recognition circuit (TE) causes the telephone controller (TK) to operate the hook switch contact (GU). Selective acceptance of incoming calls is permitted by the code receiver (KE) which responds to false or absent code numbers by triggering the reprodn. of a different message, requiring the caller to dictate to a specified memory area. USE - At telephone stations with call-)answering machinesand electronic hook switches.