JPS6017078U - Private branch telephone exchange - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

Figure 1 is a diagram of the conventionally known relay system in PABX, Figure 2
The figure shows an example of the circuit configuration of a trunk, which is a main component in the present invention, Figure 3 is a diagram for explaining the connection of a private branch telephone exchange according to the present invention, and Figure 4 shows how to connect a push-button dial telephone to an extension line. FIG. 3 is a diagram for explaining connections when used as part of a telephone.

Claims (3)

[Scope of utility model registration request] (1) Interconnection that is controlled by a common control device and has a call current supply function, line loop current status monitoring, and a gate function for sending tone signals such as ringing signal, ring tone, dial tone, howler tone, and busy tone. In a private branch telephone exchange configured such that a trunk is provided, a call originating from an extension is connected to an interconnection trunk, and a dial signal is transmitted to a common control device through the interconnection trunk, an identification result in the common control device is used to connect the extensions to each other. In the case of a call, the connection path from the interconnection trunk to the called extension is extended, and in the case of a call originating from a central office line, the connection path between the calling extension and the interconnection trunk is cut off, and the connection path between the calling extension and the central office trunk is set up. transmission of dialing signals to a common control device via an interconnection trunk for callback transfer from an incoming connected extension to another called extension via a central office trunk; First, a connection path is established to enable communication between the extension for incoming calls and the called extension, and then the connection path is restored and at the same time a connection path is established between the central office line trunk and the called extension. , when incoming calls are transferred to other extensions in the same room in the same group where incoming calls are connected via a central office trunk, special number dialing is performed by capturing the interconnected trunk by hooking as a simple operation method. The premises is characterized by having a configuration in which the connection between the office line trunk and the transferred extension is set by off-hook of the transferred extension telephone associated with the same group and special number dialing. telephone exchange. (2) In a private branch telephone exchange equipped with a call forwarding function, the called extension is monitored by a common control device via an interconnection trunk, and after detecting that the called extension is on-hook for a certain period of time or more, the above-mentioned common A private branch telephone exchange according to claim 1, characterized in that the private branch telephone exchange is configured to set a connection path between another extension reserved for transfer and a calling extension by a control device. (3) means for extending and connecting a push-button dial receiver necessary for receiving voice frequency dial signals to an interconnection trunk; and means for transmitting selected numeric information from said push-button dial signal receiver to a common control device. A private branch telephone exchange according to claims 1 to 2 of the utility model registration claims, characterized in that: