JP3080271B2 - Connection control method in automatic switching system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection control system in an interrupt and privacy state in an automatic switching system.

[0002]

In conventional automatic switching systems, a line in a call with the inner wire end device connected to the line control device, by issuing an interrupt request from another extension terminal, the interrupt extension 2. Description of the Related Art An interrupt control method for performing a call between a terminal device and a line has been performed. In addition, a secret talk control method is performed in which a secret talk request is issued from an arbitrary extension terminal apparatus, thereby prohibiting a call from being made to another extension terminal apparatus that is communicating with the line. Hereinafter, a connection control method of such a conventional automatic switching system will be described.

FIG. 7 shows a call terminal (DB) which is an extension terminal device.
Processing and LCU of a conventional telephone and line control unit (LCU) when interrupting an office line trunk during a call
FIG. 4 shows a state transition diagram of processing. In this case, it is assumed that a plurality of call consoles connected to the line control device are making a multi-party call via the conference trunk and the central office trunk. In this case, when a caller who is not on a call interrupts the busy trunk, the line button of the line requesting the caller's call is pressed. Then, the call table is interrupt request 30
As 1, the call information 302 is transmitted to the line controller.
The outgoing call information includes a TRK code indicating the identification of the office line trunk.

[0004] The line controller performs a process 303 for determining whether or not an interrupt is possible. If interruption is possible, line lamp information 305 including an interruption start command and a TRK code in the communication terminal
Is sent. The extension terminal device that has received the line lamp information 305 performs the process of the line lamp control 306. Also,
The office trunk switches the connection point of the conference trunk to the connection point from the one that is already talking, connects the newly interrupted telephone to the conference trunk, and performs multi-party calls including the extension terminal equipment. Has been realized. If the interrupt is not possible, a busy tone (hereinafter referred to as "BT tone") is sent to the call terminal of the interrupt request
) 304 is transmitted.

FIG. 8 shows a state transition diagram of the DB processing and the LCU processing of the call console and the line controller in the conventional confidential communication control system. The interrupted caller DBA processes the privacy request 401 and sends the key information 4 to the line controller.
02 is sent. The line controller performs a process 403 of determining whether or not the talker DBA is capable of confidential talk. If not, the key information 402 is set to invalid 405. If confidential,
The confidential process 404 is performed, and the line lamp information 406 is sent to the other call terminals DBB to DBG that are interrupted.
At the same time, and a BT sound for prohibiting the call is transmitted.

[0006]

However, in the case of the above-described conventional interrupt control system, the intercom DBB or DBG during a call can only know that the intercom is the interphone DBA after the interruption, so the interruption is performed. After that, troubles such as refusal of interruption by the other party occurred, and the method of checking the extension number participating in the call was not possible for both the interrupting side and the interrupted side because there was only a method of judgment based on voice. Was.

Further, in the above-mentioned conventional privacy control system, if at least one of the talkers whose interrupt is to be interrupted is interrupted, all of the interrupted speeches are released by the privacy operation of the talker DBA. There were many operational problems, such as being done.

The present invention solves the above-mentioned conventional problems. Even before the interruption, the extension number of the caller who is currently talking to the line or the extension number of the caller who is to interrupt the call can be set for each call. The object of the present invention is to provide an excellent interrupt and privacy mode connection control method which can be displayed on the display unit of a stand and can be confirmed, and when a privacy request is made, an interrupt can be released for each telephone conversation. I do.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a line control device having a central office trunk connected to a line and a conference trunk for multi-party communication, and accommodated in the line control device. A plurality of extension terminal devices,
When the line and at least one of the extension terminals are in a call, an automatic extension that allows an interruption extension terminal requesting another interrupt to interrupt a call between the line and at least one of the extension terminals. A connection control method in a system, wherein the interrupting extension terminal device, an interrupting extension display means for performing a display request of extension terminal information during a call to the line control device, and a target for displaying the extension terminal information during a call. A line selecting means for selecting a display target line to be a line,
Display means for displaying the busy extension terminal information received from the line control device, the line control device, recognition means for recognizing the display request of the busy extension terminal information and the display target line, A confidential state recognition means for recognizing whether or not the line is in a confidential state; and the busy extension terminal information indicating the extension terminal apparatus in a busy state with the display target line recognized by the recognition means. A transmitting means for transmitting to the apparatus, wherein the transmitting means does not transmit the extension terminal information during the call when the line to be displayed is in a secret state.

[0010]

Therefore, according to the present invention, the operator who desires an interrupt call can know in advance the line to which the interrupt call is to be made, the extension terminal device during the call, and the secret talk state, so that the interrupt call connection can be performed smoothly.

[0011]

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

FIG. 1 is a block diagram showing a system configuration in this embodiment. In FIG. 1, a line controller (LCU) 4 corresponding to an ISDN includes a line circuit (LIN).
2, a plurality of extension terminal devices (DB) 1 are connected. These extension terminal devices 1 and a switching public network (hereinafter, referred to as a "switching network") are connected by a central office trunk (COT) 5 and a private trunk (PVT) 6, and the extension terminal device 1 and the switching network are line control devices. Under the control of the communication path switch (NW) 3 in the (LCU) 4, any connection can be made and communication is possible. In addition, a plurality of extension terminal devices 1 are connected to a trunk of a switching network (in the case of the present embodiment, a central office trunk 5).
(Hereinafter, referred to as a “talking station”), a call is made via the conference trunk (CFT) 7 to make a call.
And the local trunk 5 are connected.

FIG. 2 shows an example of an external view of the call console 1 accommodated in the automatic switching system. A display (LCD) 102 and lines (COT and PV)
T) and line button 1 that accommodates one-touch auto dial
03, a numeric keypad 105 and the like are mounted, and two handsets 106 are provided for making a call.
Further, in realizing the present invention, the call stand 101 is provided with an interrupt extension display button 107 among the function buttons.
It is possible to display the extension number under call at 02.

FIG. 3 shows a connection diagram in which a plurality of call consoles 201 to 207 are connected to a central office trunk 5 connected to one line of a switching network to make a call. These seven call terminals 201 to 207 are connected to the central office trunk 5 via the conference trunk 7. The eight terminals of the speech path switch connected to the conference trunk 7 are connected to the conference trunk connection point Nos. 210, and numbers 1 to 8 are assigned.

In FIG. 3, a plurality of call stations 201 to 207 are connected to each other via a central office trunk 5 and a conference trunk 7 by way of an eight-party system. A method in which the call desk 208 knows the extension number during a call with the central office trunk 5 during a call will be described with reference to the state transition diagram of FIG. 4 and the display contents of FIG.

After the user presses the extension button 107 at the call desk 208, the trunk line 5 during the call is pressed.
When the line button 103 is pressed, the D on the call desk 208 shown in FIG.
In the B process, it is determined that the request is for a telephone extension number request 307, and the number request information 308 is sent to the line controller 4 instead of the call information 302. The number request information includes a number display command and a TRK code which is identification information of the office line trunk. The line controller 4 identifies whether or not the talking mode is the secret mode. If the mode is not the talking mode, the line controller 4 sends all the connected extension number information 301 to the calling desk 208 which has requested. Is sent.
It should be noted that the telephone extension number information 310 during the call includes the conference trunk connection point No. 210 is also included,
08, the LCD display control 311 causes the conference trunk connection point No. on the display 314 as shown in FIG. The extension number 316 during a call can be displayed corresponding to (1 to 8) 315.

If the line during the call is in a secret state at the identification 309 in FIG. 4, the line control device 4 sends the secret mode information 312 to the requested call terminal, and displays the extension on the display of the received call terminal. No numbers are displayed.

In this embodiment, in combination with the interrupt extension display function, the method of interrupt release (private conversation function) is given a degree of freedom, and the function is remarkably improved.

FIG. 6 is a state transition diagram of the privacy control system.
5 shows a state transition diagram after the interrupt extension number shown in FIG. 5 is displayed on the display 314 by the interrupt extension number display function. In this case, “*” added to the end of the displayed extension number is identification information indicating an extension number that can be secretly spoken.

In FIG. 6, the caller DBA checks the extension number of the caller who is interrupting on the display, and, for example, when canceling the call inhibition interrupt for only the caller DBG, the corresponding conference shown in FIG. Trunk connection N
O. 315 is designated, and then a privacy request 408 is made. The line control device 4 performs a process 410 of determining whether or not confidential communication is possible based on the key information 409 from the call desk DBA, and invalidates the key information 409 if it is not possible. Also, if possible, confidentiality processing 411 is performed, and line lamp information 413 is transmitted only to the communication desk DBG corresponding to the connection point NO of the key information 409, and a BT sound for prohibiting communication is transmitted. The interrupt release function is realized with respect to the call stand.

[0021]

According to the present invention, since the extension number (name) during a call can be known in advance before an interruption, trouble such as an erroneous interruption can be prevented. In addition, in the management call stand, the connection status of the call during the call can be monitored, and the call stand of the long-time hold line due to forgetting to disconnect can be grasped.

In addition, it is possible to arbitrarily cancel the interrupt for each call station that is interrupted, and the call is made only to the appropriate call station, so that the confidentiality function is remarkably improved.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a system configuration according to an embodiment of the present invention.

FIG. 2 is an external view of an extension terminal device (talk terminal) used in the present embodiment.

FIG. 3 is a connection diagram in an interrupt state for explaining the present embodiment.

FIG. 4 is a state transition diagram of interrupt control in the embodiment.

FIG. 5 is a display example of a list of interrupt extension numbers displayed on a display of the call stand of FIG. 2;

FIG. 6 is a state transition diagram of the confidential talk control method in the embodiment.

FIG. 7 is a state transition diagram of interrupt control in a conventional example.

FIG. 8 is a state transition diagram of a secret talk control system in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Extension terminal device 4 Line control device 5 Central office trunk 7 Conference trunk

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04M 3/42-3/58

Claims (1)

(57) [Claims] 1. A line control device having an office line trunk connected to a line and a conference trunk for multi-party communication, and a plurality of extension terminal devices accommodated in the line control device,
When the line and at least one of the extension terminals are in a call, an automatic extension that allows an interruption extension terminal requesting another interrupt to interrupt a call between the line and at least one of the extension terminals. A connection control method in a system, comprising: an interrupt extension display means for making a request for a display of extension information during a call to the line control device to the extension terminal; and a display object for displaying the extension terminal information during a call. A line selecting means for selecting a display target line to be a line, and a display means for displaying the busy extension terminal information received from the line control device, wherein the line control device displays the busy extension terminal information. Recognition means for recognizing a request and the display target line; secret state recognition means for recognizing whether the line is in a secret state; and the display target recognized by the recognition means. Transmitting means for transmitting the extension-in-busy terminal information indicating the extension terminal device in a busy state with the line to the interrupting extension terminal device, wherein when the display target line is in the secret state, the busy extension terminal A connection control method in an automatic switching system, comprising: a transmission unit that does not transmit information.