JPH05130229A - Inter-station subscriber busy state processing system - Google Patents

Abstract

PURPOSE:To relieve a load of a common line signal in a step call between stations and to use the communication line effectively by returning state information of a subscriber whose end of telephone number is different from a called station side in the case of a subscriber is busy between stations and allowing a caller station to store the information. CONSTITUTION:A station exchange 1, 4 forming each exchange station is provided respectively with a line network 1a(4a), a central controller 5, 8, and a storage device 9, 10, and the circuit networks 1a, 4a are interconnected by a voice channel AL via relay lines 2, 3. The circuit networks 1a, 4a are interconnected by a common line signal path CL via a common line signal device 6, 7 connected to the station exchange 1, 4. When the caller exchange 1 calls the called exchange 4 and the subscriber is busy, the state of a subscriber whose end of telephone number is different is returned to the caller station while it is included in a busy signal. Thus, the caller exchange 1 displays a subscriber busy state onto a caller subscriber terminal equipment or controls the called exchange 4 not started again based on the information received in advance in the succeeding step call operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage program control type central office switching system for common line signaling, and more particularly to a subscriber busy processing system between central office switching systems.

[0002]

2. Description of the Related Art In a conventional common line signaling electronic exchange, when a subscriber between certain stations makes a call to a subscriber at another station, the called party is called by the called party when the called party is busy. The busy signal was sent back to the originating station, and only the busy tone was heard at the relevant originating station. Also, when the calling subscriber performs a step call operation, the calling subscriber is called again,
It was configured to send out signals such as calling.

[0003]

The above-mentioned conventional inter-station subscriber busy processing method described above only sends back a signal indicating the busy state to the originating station when the called station is busy with the subscriber. When a subscriber of the station makes a step call while busy, it is necessary to issue a signal such as activation and calling to the called station again each time the operation is performed. For this reason,
It is necessary to send and receive signals between stations many times for each service operation during busy, which causes problems such as an increase in load of common line signals and holding of a line connecting between exchanges for a long time. An object of the present invention is to solve the above problem. When busy, the status information of the subscribers having different tails is returned from the receiving station side to reduce the load on the common line and effectively use the communication line. It is to provide an inter-station subscriber busy processing method that can be realized.

[0004]

In order to achieve the above object, the inter-office subscriber busy processing method according to the present invention is a switching method between switching stations forming a network by a common line signaling method, in which an originating switching station is When the subscriber is busy, the receiving exchange station uses a storage means for storing the number information sent by the subscriber to indicate the status of a subscriber number different from the subscriber number of the called subscriber by a subscriber busy signal. Further, each of the calling exchanges has a means for returning, and when the signal from the receiving exchange is returned, the originating exchange uses the stored number information and the status information of the received different subscriber number at the end of the subscriber. It is configured to include control means for performing busy processing.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below with reference to the drawings. FIG. 1 is a schematic block diagram showing an embodiment of a configuration between exchanges adopting an inter-office subscriber busy processing system according to the present invention. The central office exchanges 1 and 4 constituting each exchange are equipped with circuit networks 1a and 4a, central control devices 5 and 8 and storage devices 9 and 10, respectively, and a voice communication path AL is relayed between the circuit networks 1a and 4a. It is connected via lines 2 and 3. The common line signal path CL is connected via common line signal devices 6 and 7 installed in the respective exchanges 1 and 4.

FIG. 2 is a diagram showing an example of the structure of information stored in the storage device of the originating exchange. The memory unit M prepared for each calling subscriber stores the sent number information Ma and the status information Mb of the subscribers having different end numbers sent from the receiving station.

FIG. 3 is a diagram showing a processing flow in which the calling station subscriber stores the number information Ma when the calling is completed. Search for the accommodating position of the subscriber corresponding to the memory section M of the storage device (ST
31), and stores the calling number information Ma in the corresponding accommodation position (ST32).

FIG. 4 stores the status information Mb when the calling station receives a subscriber busy signal including status information of a subscriber whose calling number is different from the subscriber number which the calling station is trying to call. It is a figure which shows a processing flow. Similar to FIG. 3, the accommodating position of the calling subscriber is searched (ST41), and the received subscriber status information Mb having a different tail is stored in the corresponding section (ST42).

FIG. 5 is a diagram showing the format of a subscriber busy signal S returned to the calling station when the calling subscriber is busy on the called station side. The subscriber busy signal includes status information Sa of the subscribers having different tails.

FIG. 6 is a diagram showing a processing flow for returning the common line signal shown in FIG. 5 to the transmitting station side on the receiving side. In this processing, the call activation signal is sent from the originating station to the receiving station, and the flow after the receiving station receiving this signal determines that the called subscriber is not in the idle state (= busy state) Indicates. The number of the called subscriber from the calling station is read by a well-known means (ST61), and the empty / busy state of all the subscriber numbers whose tail ends are different from the read subscriber number (ST62), This read subscriber status information is edited as Sa in the common line signal S of FIG. 5, and this signal is returned to the transmitting station by a known means (ST63).

FIG. 7 is a diagram showing an example of control of the busy processing method between stations based on the above processing, and shows the control flow of the processing method of the step call between stations. When the subscriber on the calling station side dials the last number in the step call operation, the accommodating position of the calling subscriber is searched (ST71), and Ma and Mb accumulated in the above processing are read from the memory unit M of the storage device ( ST72). Here, the status information of the subscriber number corresponding to the last number dialed by the information of Mb is checked (ST73). Then, it is judged whether or not there is an empty state (ST74), and if it is empty, the subscriber calling of the step call destination is performed by a well-known means by the calling number of Ma and the last dial number (ST76). If it is determined in ST74 that it is not empty, the calling station sends the busy tone again to the calling subscriber (ST75). When the calling subscriber has a display unit or the like, it is possible to cause the display unit to perform a process of displaying a display for each tail number when the signal of FIG. 5 is received by the transmitting station.

[0012]

As described above, according to the present invention, in the case where a subscriber is busy between stations, status information of subscribers having different tails is returned from the receiving station side and the originating station stores this information. This makes it possible to reduce the load on the common line signal in the step call between stations. In addition, the communication line can be effectively used, and there are effects such that many usage aspects can be expected in a busy service between stations.

[Brief description of drawings]

FIG. 1 is a schematic block diagram showing an embodiment of a configuration between exchanges adopting an inter-office subscriber busy processing system according to the present invention.

FIG. 2 is a diagram showing a configuration example of information stored in a storage device of an originating exchange.

FIG. 3 is a diagram showing a processing flow in which a calling station subscriber stores number information Ma when a calling is completed.

FIG. 4 is a processing flow of storing the status information Mb when the calling station receives a subscriber busy signal including status information of a subscriber whose calling number is different from the subscriber number which is called by the receiving station. FIG.

FIG. 5 is a diagram showing a format of a subscriber busy signal S to be returned to a calling station when a calling subscriber is busy on the called station side.

FIG. 6 is a diagram showing a processing flow of returning the common line signal shown in FIG. 5 to the transmitting station side on the receiving side.

FIG. 7 is a diagram showing an example of control of a busy processing method between stations based on each processing.

[Explanation of symbols]

 1, 4 ... Central office switch 1a, 4a ... Circuit network 2, 3 ... Relay line 5, 8 ... Central control device 6, 7 ... Common line signal device 9, 10 ... Storage device

Claims (1)

[Claims] 1. In an exchange system between exchanges forming a network by a common line signaling system, a calling exchange has storage means for storing number information sent by a subscriber, and a receiving exchange has busy subscribers. In this case, each of the calling exchanges has means for returning the status of the subscriber number different from the subscriber number of the called subscriber together with the subscriber busy signal, and the originating exchange receives the signal from the destination exchange. The inter-office subscriber busy processing method, further comprising control means for performing subscriber busy processing according to the stored number information and status information of the received different subscriber numbers at the end. ..