JPH04151954A - Automatic restoration system for trunk line to trunk line connection - Google Patents

Abstract

PURPOSE:To attain the connection with a line subscriber having no reply/ restoration signal transmission function by adopting the constitution such that trunk line to trunk line connection is restored forcibly to the initial state after a prescribed measured connection time elapses. CONSTITUTION:When an extension subscriber 1 hooks on to make transfer connection of a call of a line subscriber A to a line subscriber B, on-hook detection information is sent to a central controller 5. The controller 5 collates restoration information of the subscriber 1, hold information of a trunk line 3 stored in a storage device 7, and connection information between the subscriber 1 and a trunk line 4 to make connection command between the trunks 3, 4 and connection release command between the subscriber 1 and the trunk 4 and to start a time monitor circuit 8 thereby measuring the connection time between the trunks 3 and 4. When a prescribed connection time elapses, the connection restoration information is sent to the controller 5 and the controller 5 collates the information with the connection information stored in the device 7 to interrupt forcibly the connection between the trunks 3, 4 and to restore the state to the initial state.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to the connection of office line 1 to rank in an electronic automatic switching system, and in particular to the connection of office line 1 to rank and j office line 1 to rank via an exchange.
Regarding the rank connection function.

[Conventional technology]

Conventionally, this type of station line 1 rank column line 1 to rank connection was possible only when a response/recovery signal was returned from the affiliated station to which the exchange was connected.

[Problem to be solved by the invention]

The above-mentioned conventional station line I to crank station line 1 to rank connection was only allowed if the station to which it belonged had automatic electronic exchange or a response/recovery signal sending function, or if this response/recovery signal sending function was enabled. If a rank connection is made to station line 1 to rank game line 1 when connected to an affiliated station that does not have this, the call will be terminated and no recovery signal will be sent even if the station line subscriber performs the prescribed recovery operation. Therefore, if the station line 1~rank is not restored to the initial state, the call will remain in the state 4).Therefore, when connecting with the affiliated station that does not have the response/recovery signal sending function status, the station line 1~rank~extension line will not be restored to the initial state. / Relay stand - station line 1 ~ 4g called rank
Since B was made possible by intervening the subscribers of the exchange, there was a drawback that it was not always possible to maintain sufficient privacy for telephone calls to the central office line subscribers.

[Failure to solve the problem]

The automatic recovery method of the office line 1 to rank to office line 1 to rank connection of the present invention is provided in an electronic automatic switching system having a function of connecting the office line trunk to rank to the office line 1 to rank after starting the trunk connection of the office line 1 to rank to the office line. A station line 1 to rank connection time measuring means for measuring time, and a connection recovery means for forcibly restoring the station line 1 to rank game line trunk connection to an initial state after a predetermined time has elapsed from the measured connection time. The system is configured to perform office line trunk-to-office line trunk connection even when connecting to an affiliated station that does not have a recovery/response signal sending function.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a state in which a telephone call is being made with a central office line subscriber A through an extension subscriber 1 or a central office line trunk 3. In FIG.

Figure 1 shows extension subscriber 1 and extension subscriber 1's subscription number 1.
42 and rank 3 to the central office line 1 which connected the central office line subscriber A.
The station line subscriber U3 accommodated in the affiliated station that does not have a response/recovery signal sending function, the station line 1 to rank 1 that connect the station line subscriber B, and the central control unit 5 that performs call connection control. ,
an audible tone sending circuit 6 which sends out a warning tone to notify the calling center line subscriber that the call has been disconnected when restoring the rank to the first J (Jl state); The call is connected to a storage device 7 that stores the connection state before transfer when transferring the call to the central office line subscriber of the affiliated station, and a time monitoring circuit 8 that is activated at the time of transfer and stops after a predetermined period of time has elapsed. It consists of a switch and a dial counting circuit 10.

In Fig. 1, when central office line subscriber A requests extension subscriber 1 to make a call with central office line subscriber B, extension subscriber 1 performs a hooking operation → - central office line l ~ rank access code + subscriber of central office line B. Dial the number. This hooking information is sent to the central control unit 5 via the extension subscriber circuit 2, which connects the extension subscriber 1 and the dial counting circuit 10, counts the dialed office line trunk access code, and then controls the central control unit 5. It is sent to device 5.

Here, the central controller captures the office line L-Rank 4, connects it to extension subscriber 1, and sends the subscriber number of office line subscriber B to the affiliated station where office line subscriber B is accommodated. . When local line subscriber B responds, a communication path between extension subscriber 1 and local line subscriber B is established. At this time, the central office line trunk 3 is put on hold, and at the same time, the central office line subscriber A is placed on hold, and at the same time, the extension subscriber]
The connection between the office line trunk 4 and the office line trunk 4 and the pending status of the office line trunk 3 are stored in the storage device 7.

Next, when the extension subscriber 1- performs an on-hook operation to transfer and connect the call of the central office subscriber A to the central office subscriber B, the extension subscriber circuit 2 detects an on-knock, and the central control unit 5 receives on-hook detection information. or is sent as recovery information. The central control device 5 stores the recovery information of the extension subscriber 1 and the status of the station lines 1 to 3, which are stored in the storage device 7 before the reversal operation.
on hold (extension subscriber 1 and central office line 1 due to W report and transfer operation)
~Verify the connection information with rank 4, instruct the connection between the office line trunk 3 and the office line trunk 4, and the extension subscriber] and the office line 1~
At the same time as giving an instruction to disconnect from rank 4, the time monitoring circuit 8 is activated to start measuring the connection time with station lines 1 to 3.4. The time monitoring circuit 8 starts measuring, and when the connection time has elapsed for a predetermined period of time, it sends connection restoration information for restoring the relevant office line trunk to its initial state to the central controller 5, and the central controller 5 sends the connection restoration information to the storage device. The audible sound sending circuit 6 is connected to both office line 1-rank 3 and office line 1-rank 4, and calls are made to both office line subscribers A and B. After transmitting a predetermined warning sound for a certain period of time to forewarn forced disconnection, the connection between the office line trunk 3 and the office line 1-rank 1 is forcibly disconnected, and the initial state is restored. Note that the measured time of the time monitoring circuit 8 can be easily changed by registering it in advance as system data, and can be flexibly adapted to each system.

〔Effect of the invention〕

As explained above, the present invention is applicable to central office line subscribers accommodated in exchanges equipped with response/recovery signal sending functions, and central office line subscribers accommodated in affiliated stations not equipped with response/recovery signal sending functions. When connecting to a local office, the extension subscriber responds to a call from a central office line subscriber with the response/recovery signal sending function and then transfers the call to the central office subscriber of the affiliated station. It does not have a function to send a response/return signal by forcibly disconnecting the trunk of the central office line and restoring it to the initial state after giving notice of disconnection to the central office line subscriber who is in the middle of a call after a period of time has elapsed. This has the effect of allowing a central office line trunk connection to be made to the central office line subscriber of the affiliated station.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. 1... Extension subscriber, 2... Extension subscriber circuit, 3...
・Station line 1 to rank, 4...Rank to station line 1, 5...Central control unit, 6...Audible sound sending circuit,...Storage device, time monitoring circuit, 9...Switch, ]0 ...Dial counting circuit.

Claims (1)

[Claims] In an electronic automatic switching system having a central office line trunk-to-office line trunk connection function, a central office line trunk connection time measuring means for measuring the time after the start of the central office line trunk-to-office line trunk connection, and a predetermined time determined in advance for the measured connection time. and a connection restoration means for forcibly restoring the central office line trunk connection to the initial state after a period of time has elapsed, and the central office line trunk connection can be restored even when connected to an affiliated station that does not have a restoration/response signal sending function. An automatic recovery method for a central office line trunk-to-office line trunk connection, which is characterized by performing a line trunk connection.