Telephone line concentrator without switching matrix

摘要

Apparatus for use in conjunction with a PBX system and a telephone answering system is disclosed in which line scanners are used to detect the presence of ring signals on each of the extension lines within the PBX system and to determine when the number of such ring signals on a monitored line exceeds a predetermined limit. A computer coupled to each of the line scanners, upon determining that the predetermined limit has been exceeded, actuates automatic dialing circuitry, which is connected to both the PBX and telephone answering systems, to dial the PBX system and cause it to carry out a directed call pick-up of the incoming call. Simultaneously, the automatic dialing system dials the telephone answering system on a different telephone line. The computer then controls the automatic dialing circuitry to couple the incoming call to the telephone answering system without the incoming call having been answered.