JP3137553B2 - Call back and recall prevention method in digital private branch exchange. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relay console and an ISDN (In
tegrated Services Digital Network, digital Sir
Bis comprehensive network) digital private branch exchange which accommodates the extension
(Hereinafter referred to as PBX) during ISDN
The present invention relates to a method of returning a call when an extension (hereinafter, referred to as IEX) is disconnected and a method of preventing a re-call.

[0002]

BACKGROUND ART Oite the conventional P B X, to the extension of the speech path is opened to the relay board, although able to perform call-back service, this service dial pulse type telephone set , I have not been to either provide general extensions such as a push-button telephone set and the enhanced phone. I E X
In contrast to, this call-back service is not provided. FIG. 2 is a diagram showing an outline of a call back service from the relay console. The PBX 1 connects, for example, the extension 2 of the dial pulse type telephone and the relay console 3, and secures a communication path P therebetween. When the extension is disconnected by on-hook on the extension 2 side during a call between the relay console 3 and the extension 2, the extension 2 is disconnected but the communication path P is maintained. Therefore, when the user goes off-hook again at extension 2, a call can be made. When the call-back button is pressed by an instruction from the relay console 3, the extension 2 rings in response to the call-back from the relay console 3.

FIG. 3 is a diagram showing a conventional control of a relay stand when IEX is disconnected. During a call, the PBX 1 connects the IEX 4 to the relay console 3. That is, the communication path P between the IEX 4 and the relay console 3 and the data transmission / reception channel Bch are secured.
When the IEX 4 is disconnected while the IEX 4 and the relay console 3 are connected by the PBX 1, the PBX 1
(Telecommunication and Telephone Technical Committee) Releases the call number of the terminal according to the standard Q931 Layer 3 release procedure. After the IEX 4 is disconnected, when the IEX 4 makes a call to another extension 5 or the like, the PBX 1 changes the extension 5 with a new call number because the call number in the outgoing call is different from the call number when the relay console 3 is connected. Connect to IEX4. Then, when the disconnection button is pressed on the relay console 3, the previous communication path P and the channel Bch are released. That is, recalling could not be prevented, and IEX4 could not be called back from the console 3. Even if the call back button is pressed by the relay console 3, it is invalid.

[0004]

As described above, the conventional PBX has the following problems. Relay station 3
If IEX4 is disconnected while the IEX4 and IEX4 are connected, the recall of the IEX4 cannot be prevented and the call back service cannot be performed.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a method for preventing a call back and a recall in a PBX.
Method, a voice-based IE connected to a basic interface or a primary interface of a point-to-point connection or a point-to-multipoint connection
A central control unit and a storage device are provided in the PBX containing X,
Wherein the central control unit and said storage device and said PBX, operating in call control application program for controlling the exchange protocol program and replacement services for controlling for exchanging operation of the PBX. Then, the identification number of the IEX for which a communication path has been established for the relay station of the PBX is stored in the storage device, and when the IEX is disconnected during a call with the relay station, the storage device is stored in the storage device. A call back service is provided to the IEX based on the stored identification number, and if the disconnected IEX attempts to make a call to a device other than the relay console before the service is provided, the storage is performed. identifies the IEX based on the identification number stored in the device, are to be connected to the communication path for forcibly the attendant the IEX.

[0006]

According to the present invention, as described above, the method for preventing a call back and recalling in the PBX is constituted, so that the PBX, the central control device and the storage device are operated by the exchange protocol program and the call control application program. IE
X is connected to a point-to-point or point-to-multipoint connection basic interface or primary interface. Where PBX
The identification number of the IEX for which the communication path has been established for the relay console is stored in the storage device, and when the IEX is disconnected during the call with the relay console, the IEX is identified based on the identification number stored in the storage device. A call back service for the IEX is performed. Also, if the disconnected IEX attempts to make a call to a device other than the attendant console before the service is provided, the IEX is identified based on the identification number stored in the storage device. Then, the IEX is forcibly connected to the communication path for the relay console. Therefore, the above problem can be solved.

[0007]

FIG. 1 is a block diagram of a PBX showing an embodiment of the present invention. The PBX 10 includes a central control device 11 for controlling the communication path P10 and a storage device 12. The PBX 10, the central control device 11, and the storage device 12 include an exchange protocol program 13 for controlling an exchange operation for accommodating a voice IEX and a call control application program for controlling an exchange service (hereinafter, call control AP). 14). The exchange protocol program 13 is set in layer 3 of the TTC standard Q931. Central control unit 11 and the storage device 12, in addition to the these programs 13, T
Although it is operated by a program conforming to each layer 1 and 2 of the TC standard Q931, it is not a main part of the present invention, and therefore detailed description is omitted in this specification. The storage device 12 includes an IEX storage memory 12-1 and an intermediary stand storage memory 12-2. The PBX is stored in the IEX storage memory 12-1.
It has a function of storing the extension numbers of a plurality of IEXs connected to 10 and storing the calling number which is the number of the IEX to be called. In addition, the storage memory 12-2 for the relay console is
It has a function of storing the number of the relay console and the calling number of the IEX.

Next, a description will be given of a method of preventing a call back and a recall in the PBX 10 of FIG. Now, when a certain IEX 20 makes a call to the intermediary console 30, additional information accompanying the call, such as a calling number and a called number, are exchanged with the exchange protocol program 1.
3 to the call control AP 14 (SETU
P) Passed as request. Central control unit 11 has call control A
It is operated by P14, extracts the calling number from the additional information passed from the exchange protocol program 13, and stores the extracted calling number in the IEX storage memory 12-1. After the communication path P10 between the IEX 20 and the relay console 30 is opened and the relay console 30 is called, the relay console 30 responds. At the time of this response, the central controller 11 stores the calling number of the IEX 20 in the storage memory for relay console 12-2. When the IEX 20 is disconnected in a state where the relay console 30 and the IEX 20 are connected, if the call back button is pressed on the relay console 30 side, the central control device 11 stores the IEX 20 in the relay console storage memory 12-2 based on the call control AP 14. The stored calling number of IEX 20 is read. Then, the read IE
The calling number of X20 is incorporated in the called number information element in the setup message of the exchange protocol program 13. A call back service to the IEX 20 is performed based on the called number information element.

FIG . 4 illustrates a method for preventing a recall according to FIG .
FIG. If the IEX 20 attempts to make a call (recall) to another extension or the like before the intermediary console 30 calls back the IEX 20, the setup message from the IEX 20 is sent to the call control AP 14 via the exchange protocol program 13. Passed as setup instruction. That is, additional information such as a new calling number and called number of the IEX 20 is passed to the call control AP 14. The call control AP 14 is indexed by the extension number of the IEX 20, and
The issue number of IEX20 stored in 2-1 is compared with the new issue number. That is, the calling number in the additional information of the setup instruction is compared with the calling number stored in the storage memory 12-1. When the comparison results match, it is recognized that the IEX 20 connected to the intermediary console 30 is about to make a call again. The call control AP 14 continuously sends a call setting request (CALL PROC.) And a response request (CONN.) To the exchange protocol program 13 and the layer 1 and 2 programs. At this time, the called number in the additional information is ignored.
The central control unit 11 includes an exchange protocol program 13
And IEX according to the instruction of the program of each layer 1 and 2.
20 is connected to the communication path P10 of the relay console 30. The calling number in the additional information of the setup instruction and the storage memory 12
The calling number stored in -1 is compared, and if the comparison result does not match, the call is not a recall, so that a call path such as the IEX 20 and another extension is established by normal calling processing. .

As described above, in this embodiment, the audio IE
A central control device 11 and a storage device 12 are provided in the PBX 10 accommodating the X 20 , and these are operated by the exchange protocol program 13 and the call control AP 14, and the relay board 3 of the PBX 10 is operated.
For 0, the calling number of the IEX 20 in which the communication path P10 is established is stored in the storage device 12. Then, if the IEX 20 is disconnected during a call with the attendant console 30, a call back service is performed based on the stored calling number, and if an attempt is made to make a recall before the call back service is performed, the IEX2
0 is forcibly connected to the communication path P10 for the relay console 30. Therefore, the IEX 20 can be provided with the same call back service as that of a general extension.

The present invention is not limited to the above embodiment, but can be variously modified. For example, there are the following modifications. (1) In the above-described embodiment, the case where the IEX 20 is disconnected while the relay console 30 and the IEX 20 are connected is described.
It can also be applied when sending a request to That is, IEX2
Since the call back service for 0 is possible, the IEX 20 can disconnect and wait while the relay console 30 performs the request transmission operation. In this case, after the intermediary console 30 is connected to the requesting communication partner, the intermediary console 30 is connected to the IE.
Call back to X20 and transfer to IEX20. (2) Although the above embodiment describes an example of the PBX 10 that identifies the IEX 20 by the calling number, the present invention is applicable not only to the calling number but also to the PBX operated by adding the calling subaddress. It is possible. In this case, each storage memory 1
By providing an area for storing the calling subaddress for 2-1 and 12-2, the IEX 20 can receive the same return service as that of a general extension.

[0012] (3) In the above embodiment, IEX20 but indicates an example that is connected to the relay board 30 in the form of a point-to-point connection, point-to-multipoint connection or a primary group in tough Esu The application is also applicable when connected. In a point-to-multipoint connection where a plurality of IEXs 20 are connected, each IEX 20
When the EX 20 is operated by the MSN (multiple extension numbers) having the respective extension numbers, the EX 20 is operated in the same manner as in the above embodiment to perform the call back service. If not operated by MSN, the calling number of one IEX 20
There are cases where the calling party number is the same as the calling party number of 20 and the IEX 20 cannot be identified. Therefore, the additional information of the setup instruction sent from the exchange protocol program 13 includes C
An ES (Connection End Safix; a number for identifying the terminal IEX 20 at the time of a point-to-multipoint connection) is added. Then, each of the storage memories 12-1, 12
An area for storing CES is added to -2. In this way, the present invention can be applied to a point-to-multipoint connection.

[0013]

As described above in detail, according to the present invention, a central control unit and a storage device are provided in a PBX accommodating a voice IEX, and these are operated by an exchange protocol program and a call control AP. The calling party number of the IEX for which the communication path has been established for the relay station of the PBX is stored in the storage device. When the IEX is disconnected during the call with the attendant performs call-back service based on the stored calling party number, if the call-back service attempts to perform re-calling before that takes place, force the IEX Is connected to the communication path for the relay console. For this reason, it is possible to prevent a recall from the IEX and to provide the IEX with a return call service similar to that of a general extension.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a PBX showing an embodiment of the present invention.

FIG. 2 is a diagram showing an outline of a call back service from a relay console.

FIG. 3 is a diagram showing conventional control of a relay stand at the time of IEX disconnection.

FIG. 4 is a diagram illustrating a method of preventing a re-calling according to FIG. 1;

[Explanation of symbols]

 Reference Signs List 10 PBX 11 Central control device 12 Storage device 12-1, 12-2 Storage memory 13 Exchange protocol program 14 Call control AP

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04M 3/42 H04M 3/60 H04Q 3/58

Claims (1)

(57) [Claims] 1. An audio system IS connected to a basic interface or a primary interface of a point-to-point connection or a point-to-multipoint connection.
The central control unit and a storage device provided in a digital private branch exchange accommodating the DN extension, and the central control unit and said storage device
Wherein the digital flight exchanger, operating in a switched call control application program for controlling the protocol program and replacement services for controlling for exchanging operation of the digital private branch exchange, the speech path to the relay board of the digital private branch exchange The identification number of the established ISDN extension is stored in the storage device, and the ISDN extension is disconnected based on the identification number stored in the storage device when the ISDN extension is disconnected during a call with the attendant console. A call back service is provided for the extension, and if the disconnected ISDN extension attempts to make a call to a device other than the relay console before the service is performed, the identification number stored in the storage device Based on that
Identifies the ISDN extension, the ISDN extension forcibly the connecting to the communication path for the attendant, call-back and recalling preventing method in a digital private branch exchange, characterized in that.