Abstract: An arrangement is disclosed for charging a credit card number for a call extended from a calling customer line to a called destination via a toll telecommunications network. Calls including supervisory and traffic information from a plurality of calling lines are multiplexed for extending the calls over a time division multiplex communications channel through the call charging arrangement to the network. The arrangement includes a time slot separator for separating the supervisory information from the call information and a switching network for switching the remaining call information to a traffic information receiver. A central processor in the arrangement receives the credit card number from the traffic information receiver and forwards the number to a data base for call charging authorization. When authorized, the processor utilizes the supervisory information to make a record charging the credit card number for the call.

Abstract: Disclosed is a channel unit for directly interconnecting a toll office multiplex carrier channel line and a terminal unit line such as that of a private branch exchange (PBX) or a telephone station set, thereby eliminating the normal local end office interconnection. In particular, the channel unit interfaces the different signaling protocols of the two lines and generates call progress controls signals such as dial tone and audible ringing which are normally generated by the local end office. The channel unit comprises a converter for each line for converting the electrical interface signals representative of the busy and idle conditions of the line to logic level signals also representative of the busy and idle conditions of the line. A predetermined series of these logic level signals form a control signal that indicates the state in one signaling protocol of a call on the line.

Abstract: Disclosed is a channel unit for directly interconnecting a toll office multiplex line and a terminal unit line such as that of a private branch exchange (PBX) or a telephone station set, thereby eliminating the normal local end office interconnection. In particular, the channel unit interfaces the different signaling protocols of the two lines and generates call progress controls signals such as dial tone and audible ringing which are normally generated by the local end office. The channel unit comprises a converter for each line for converting the electrical interface signals representative of the busy and idle conditions of the line to logic levels also representative of the busy and idle conditions of the line. A predetermined series of these logic levels form a control signal that indicates the state of a call on the line.