Call rerouting arrangement

Claim 1

A COMMUNICATION SYSTEM COMPRISING A SWITCHING NETWORK FOR SELECTIVELY ESTABLISHING CONNECTIONS BETWEEN ANY ONE OF PLURALITY OF ORIGINATING PATHS AND ANY ONE A PLURALITY OF TERMINATING PATHS BY ONE OF A PLURALITY OF POSSIBLE ROUTES; A PLURALITY OF LINE CIRCUITS AND ASSOCIATED LINES, EACH LINE CIRCUIT HAVING AN INDIVID UAL CONNECTION TO AN ORIGINATING PATH AND AN INDIVIDUAL CONNECTION TO A TERMINATING PATH, A PLURALITY OF REGISTERS INDIVIDUAL TO THE LINE CIRCUITS, EACH REGISTER INCLUDING A SET OF STORAGE ELEMENTS FOR RECORDING THE SEQUENCE STATE OF CALLS AT THE ASSOCIATED LINE AND A SET OF STORAGE ELEMENTS FOR RECRODING CALLED LINE NUMBER DESIGNATIONS, CONTROL EQUIPMENT FOR CONTROLLING STROGE IN THE REGISTERS, SIGNALLING CONNECTIONS FROM THE LINE CIRCUITS TO THE CONTROL EQUIPMENT TO FORWARD SUPERVISORY AND CALL SIGNALS FROM THE LINDS, MEANS IN CONTROL EQUIPMENT RESPONSIVE TO AN OFF-HOOK SIGNAL FROM A CALLING LINE VIA ITS SIGNAL CONNECTION TO CAUSE A CALLING STATE TO BE RECORDED IN THE SEQUENCE STATE SET OF THAT LINE''S REGISTER MEANS IN THE CONTROL EQUIPMENT RESPONSIVE TO CALL SIGNALS FROM THE CALLING LINE VIA ITS SIGNAL CONNECTION TO CAUSE A CORRESPONDING NUMBER TO BE RECORDED IN THE CALLED NUMBER SET OF THAT LINE''S REGISTER; A MARKER HAVING CONNECTIONS TO THE CONTROL EQUIPMENT AND TO THE SWITCHING NETWORK, MEANS IN THE CONTROL EQUIPMENT RESPONSIVE TO THE COMPLETION OF A CALLED NUMBER DESIGNATION AND RECORDING OF A CORRESPONDING SEQUENCE STATE IN THE REGISTER OF THE CALLING LINE TO CAUSE THE MARKER TO BE SEIZED, MEANS IN THE MARKER TO MAKE A BUSY TEST OF THE CALLED LINE BY ACCESSING THE CALLED LINE REGISTER VIA THE CONTROL EQUIPMENT TO DETERMINE THE SEQUENCE STATE STORED THEREIN AND IF IN AN IDLE STATE TO FIND AN AVAILABLE ROUTE AND CAUSE A CONNECTION TO BE ESTABLISHED THROUGH THE SWITCHING NETWORK BETWEEN THE ORIGINATING PATH OF THE CALLING LINE AND THE TERMINATING PATH OF THE CALLED LINE BY WAY OF THE ROUTE FOUND; MEANS INCLUDED IN SAID CONTROL EQUIPMENT TO RESPOND TO A CALL SIGNAL WHICH DESIGNATES A REROUTE REQUEST FROM A FIRST ONE OF SAID LINES VIA ITS SIGNAL CONNECTION FOLLOWED BY THE CALL SIGNALS DESIGNATING THE NUMBER OF A SECOND OF SAID LINES TO RECORD IN THE FIRST-LINE REGISTER CALLED-NUMBER SET THE DESIGNATION OF SAID SECOND LINE AND TO RECORD A REROUTE CONDITION STATE IN THE SEQUENCE-STATE SET OF THE FIRST LINE, MEANS INCLUDED IN SAID MARKER WHICH DURING A CALL IN WHICH SAID FIRST LINE IS BEING CALLED AND THE BUSY TEST FINDS THE REROUTE CONDITION STATE, RESPONDS THERETO RECEIVE FRON THE FIRST-LINE REGISTER THE DESIGNATION OF THE SECOND LINE, AND MAKES A BUSY TEST OF THE SECOND LINE AND IF IDLE SEARCHES FOR A ROUTE AND CAUSES A CONNECTION TO BE COMPLETED BETWEEN THE THIRD LINE AND THE SECOND LINE.