Abstract: An improved dialling code processor (12) that is adapted to connect to a telephone line (11) in parallel with other devices (13) that use the same telephone line (11). The processor (12) may operate by: (a) detecting at least one dialling signal placed on a telephone line (11), and (b) inverting the detector signal to form a modified signal, and (c) placing the modified signal on the telephone line (11), wherein the modified signal is adapted to substantially cancel out the original detected dialling signal on the telephone line (11).

Abstract: A telephone dialling code processor intercepts outgoing dialling codes such as tones or pulses from a telephone terminal or the like and if the sequence matches a stored sequence it transmits a modified sequence of tones or pulses so that for example a telephone exchange is caused to make the connection along an alternative path or to provide enhanced services. Block 105 monitors the line condition along with block 109 which senses line current in the telephone line 112 and thus the state of the telephone terminal. A muting circuit 101 is used to interrupt or nullify the original dialling tones, a dial tone decoder/receiver 110, storage of predetermined dialling sequences is at 103, a dialling tone encoder/generator 106 reconstructs a replacement dialling sequence and all are controlled by a microprocessor 107 with program memory. Internal power can be derived from the telephone line by 102.