JPH03174860A - Extension state notice control system - Google Patents

Abstract

PURPOSE:To improve the service between stations by always monitoring a state change in an extension terminal equipment and storing the extension state into a storage device at the detection of the state change. CONSTITUTION:A central processing unit 21 monitors the state of a subscriber terminal equipment 12 and writes the state of a subscriber to a storage device 22. Then a common line signal device 14 reads the state of the subscriber of the storage device 22 to inform the state of the subscriber through a common line to an automatic telephone exchange 11 being a connection opposite party and writes the state of the subscriber informed from the automatic telephone exchange 11 being the connection opposite party to the storage device 22. Then the extension state between stations is informed and the inter-station service is improved without giving load to the central processing unit 21 and affecting the transmission/reception of the normal call control signal in a private branch of automatic exchange 11 connected by the common line signal system.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention provides information on the status of extension terminals between the private automatic telephone exchanges in a telephone switching network of private automatic telephone exchanges connected by a common line signaling method. It relates to a control method for transmitting and receiving signals.

[Prior art] In the past, there were many cases in which multiple private automatic telephone exchanges were connected using a common line signaling system and operated as if they were a single station. This is realized due to an increase in the amount of signals required to transmit and receive extension status, an impact on call control signals when transmitting and receiving the above signals via a signal link for call control, and an increase in the load on the central processing unit. could not. Furthermore, when processing is possible depending on the traffic situation, this is achieved by transmitting and receiving an extension status notification signal via a signal link that transmits and receives normal call control signals.

[Problem to be solved by the invention]

The purpose of the present invention is to reduce the effects of delays in transmission and reception of call control signals caused by notifying the status of extension terminals such as empty/blocked between private automatic telephone exchanges connected by a common line signaling system using a common line signal. Another object of the present invention is to provide a control method that reduces the load on the central processing unit due to the transmission and reception of the above-mentioned signals, and transmits and receives the state of an extension terminal without affecting switched call processing. [Means for Solving the Problems] The present invention is an extension status notification control method for an automatic telephone switching system that connects interoffices using a common line signaling system, wherein the automatic telephone exchange has a common line status notification control system that connects common line signaling links. comprising a line signaling device, a central processing unit that controls the entire exchange, and a storage device, the central processing unit monitors the status of subscriber terminals and writes the status of the subscriber to the storage device,
The common line signaling device reads the status of the subscriber from the storage device, notifies the automatic telephone exchange of the connected party of the status of the subscriber via the common line, and confirms the status of the subscriber notified by the automatic telephone exchange of the connected party. The present invention is characterized in that the state of the person is written in the storage device.

[Operation] The central processing unit of the private automatic telephone exchange constantly monitors changes in the state of the extension terminal, and stores the extension state in the storage device when a change in state a is detected, so that the central processing unit and the common signaling device and a common storage device accessible by the central processing unit, the central processing unit writes the extension line status to the common storage device, and the common signal device constantly monitors the common storage device and edits the extension line status into a common line signal. Send to the game. Further, the common line signaling device that receives the extension status notification signal is configured to write the extension status in the common storage device and notify the central processing unit. Furthermore, in the signal link configuration when connecting using the common channel signaling method, a backup signal link that is not normally used at all may be installed in case the signal link that transmits and receives call control signals becomes a failure. At least one backup signal link is provided, and the extension status signal transmission/reception control is executed by a common signaling device to which the backup signal link is connected.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a connection of a private automatic telephone exchange connected by a common line signaling system. Here, 11 is a private branch automatic telephone exchange, 12 is an extension terminal housed in the private branch automatic telephone exchange 11, 13 is a call link for communicating between the private branch automatic telephone exchanges 11, and 14 is a common line signal link. , a common line signal device for transmitting and receiving common line signals;
15 is a regular signal link for passing a common line signal for call control, and 16 is a standby signal link for passing a call control signal in place of the regular signal link 15 when the regular signal link 15 becomes unavailable. It shows.

In the connection state shown in FIG. 1, all call control signals for switched call processing, such as when the extension terminal 12 calls the other party's extension terminal 12 and makes a call, are sent to the regular signal link 1.
5, each private automatic telephone exchange 11
The exchange process is being executed. In addition, preliminary signal link 1
6 is a backup signal link that is not used at all if the regular signal link 15 is normal, and is used in place of the regular signal link 15 when the regular signal link 15 becomes unavailable due to a failure or the like. Yes, the configuration is such that it does not affect the exchange process.

FIG. 2 shows an example of the equipment configuration of the private automatic branch telephone exchange 11 in FIG. 1. As shown in FIG. Here, 21 is a central processing unit, 22 is a storage device storing exchange processing programs, etc., and 23 is a central processing unit and a common line signal device 14.
A common storage device that can be accessed by both is shown, respectively. The central processing unit 21 controls the entire switching process of the private automatic telephone exchange 11 according to a program stored in the storage device 22. At this time, the central processing unit 2
1 constantly monitors the status of the extension terminal 12 and executes a process of writing the status of the extension terminal 12 into the common storage device 23 when a change in the status is detected. Further, the common line signaling device 14 to which the backup signal link 16 is connected monitors the common storage device 23, edits the extension terminal status written by the central processing unit 21 into a common line signal,
It is transmitted to the opponent via the preliminary signal link 16. Note that the common line signal device 14 to which the regular signal link 15 is connected
does not execute the above control because it concentrates on transmitting and receiving call control signals. Further, the common line signaling device that has received the extension terminal status signal analyzes the information in the signal and executes a process of writing the opponent extension terminal status included in the signal into the common storage device 23. When the central processing unit 21 executes a service such as an extension busy display, it can be controlled based on the status of the extension terminals throughout the network by referring to the common storage device 23. Note that the common storage device 23 has a storage area that can store the status of each extension terminal within the network.

FIG. 3 shows the structure of a call control level 4 signal defined by the CCITT No. 7 common line signaling system. Here, the label represents a call to be controlled in signal transmission/reception, and the Hella Blang code represents the type of signal.

Additionally, additional information is added to each signal when information is required.

FIG. 4 shows an example of the configuration of a common signal for notifying the extension terminal status. This signal is CCITTNo,
In the 7 common line signaling system, this is a newly added signal that is not specified, and is composed of a heading code representing an extension status notification signal, a target extension terminal number, and status information of the extension terminal.

One embodiment of the present invention has been described above using the network configuration shown in FIG. 1 and the equipment configuration shown in FIG. Needless to say, the control is interrupted and the call control signal transmission and reception is concentrated on. Further, depending on the traffic situation, the above control can be realized using only the regular signal link.

[Effects of the Invention] According to the present invention, in a private automatic telephone exchange connected by a common line signaling system, by transmitting and receiving an extension status notification signal, the central processing unit is not burdened, and normal call control signal transmission and reception can be performed. Since it is possible to notify the extension status between offices without affecting the network, it has the effect of improving inter-office services.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing an example of the connection of a private automatic telephone exchange connected by the common line signal system, Fig. 2 is a diagram showing an example of the equipment configuration of the above-mentioned private automatic telephone exchange, and Fig. 3 is a diagram showing an example of the equipment configuration of the above-mentioned private automatic telephone exchange. FIG. 4 is a diagram showing a basic configuration, and is a diagram showing an example of the configuration of an extension status notification signal. 11-m--Private automatic telephone exchange, 14-m--Common line signaling equipment, 15.16---Common line signaling link, 21--
Central processing unit, 23-11 common storage device Figure 2 Figure 3

Claims (1)

[Claims] 1. An extension status notification control method for an automatic telephone switching system that connects between offices using a common line signaling system, in which an automatic telephone exchange has a common line signaling device that connects common line signaling links, and a central system that controls the entire exchange. comprising a processing device and a storage device, the central processing monitors the status of the subscriber terminal;
writing the status of the subscriber to the storage device, the common line signaling device reading the status of the subscriber from the storage device;
Extension status notification control characterized in that the status of the subscriber is notified to the automatic telephone exchange of the connected party through a common line, and the status of the subscriber notified by the automatic telephone exchange of the connected party is written in the storage device. method.