JP3197754B2 - Private branch exchange 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 private branch exchange system in which a plurality of private branch exchanges are sequentially connected.

[0002]

2. Description of the Related Art A conventional private branch exchange has been configured to store the numbering plan information of a terminal connected to the private branch exchange. With such a configuration, when a plurality of private branch exchanges are connected, the telephone number transmitted from the terminal device is checked by the number plan checking means, and when it is necessary to transfer the telephone number to another private branch exchange, the transferred private branch exchange is used. It is necessary to judge the presence or absence of the telephone number by collating each switching device with the number plan collating means. Further, a transmission path has been used as a transfer path for calls between private branch exchanges and as a relay path for calls. Also, when connecting or adding a private branch exchange, the numbering plan information has been input in the startup process for each private branch exchange.

[0003]

Therefore, in the prior art, in a private branch exchange system in which a plurality of private branch exchanges are connected, a call connection is made to a terminal having a telephone number that is not included in the number plan information of the private branch exchange. In addition, it is necessary to search for the telephone number by the exchange means for each private branch exchange to be relayed, and there is a problem that the connection time greatly differs for each telephone number. In addition, since the private branch exchange is used as a relay path by the call control means, there is a problem that it cannot be used for half of the call on average as compared with a call between adjacent private branch exchanges only. Further, there has been a problem that it is difficult to check for errors and inconsistencies in the numbering plan information input by a plurality of private branch exchanges.

An object of the present invention is to solve such a problem and to simplify a means for exchanging a transferred telephone number in a private branch exchange to shorten a connection time. It is another object of the present invention to reduce the probability that a transmission path between private branch exchanges is used as a relay path. It is another object of the present invention to integrate the input of the numbering plan information for each private branch exchange to reduce the probability of occurrence of an input error.

[0005]

According to the present invention, in order to achieve the above object, the private branch exchange stores the number plan information of all private branch exchanges connected to the private branch exchange system, and transmits the call originating terminal. The private branch exchange to which the device is connected is configured to be able to identify the private branch exchange accommodating the partner terminal device. Furthermore, the private branch exchanges at both ends are connected and connected in a ring shape, and the private branch exchanges to be relayed are configured such that the shortest path with the least number of routes is determined and connected. Further, it is configured such that the routing information such as the numbering plan information and the identification information of the private branch exchange inputted to one private branch exchange is transmitted to another private branch exchange connected to the private branch exchange system.

[0006]

In the private branch exchange system, the private branch exchange to which the originating terminal is connected is specified, and the private branch exchange accommodating the other terminal is transferred to the private branch exchange which relays the identification information together with the telephone number. Therefore, each private branch exchange to be relayed operates so as to perform routing only by matching of the identification information. Further, when the private branch exchange system is configured in a ring shape, it operates to determine the number of private branch exchanges to be relayed from the positional relationship of the identification information and select a route. Further, the system operates so that the same information is shared between the private branch exchange systems, such as the number plan information and the identification information of the private branch exchange, when the system is started up and the failure is recovered.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a private branch exchange system according to the present invention. In FIG. 1, reference numerals 10, 11, and 12 denote private branch exchange devices, reference numerals 20, 22, and 23 denote telephone terminal devices, reference numeral 30 denotes identification means, and reference numeral 31 denotes storage means. , 32 are exchange means, 33 is number plan collation means, 34 is call control means, 35 is identification information collation means, 40 and 42 are number plan information, 41 and 45 are telephone numbers, 44 is an identification number and a telephone number, 50 And 51 are transmission paths.

First, a case where a telephone call is made from the telephone device 20 to the telephone device 23 will be described as an example. When a call is made from the telephone device 20, the telephone number 41 is input to the identification means 30 of the private branch exchange 10. The identification means 30 searches the storage means 31 using the telephone number 41 as a keyword, and extracts the numbering plan information 40 having the identification number and the telephone number 44 as records. The identification means 30 inputs the identification number of the numbering plan information 40 to the identification information matching means 35.
The identification information matching means 35 compares the identification number with the identification number of the private branch exchange 10, and confirms that the identification number of the numbering plan information 40 matches the identification number of the private branch exchange 10. The identification means 30 inputs the telephone number 41 to the numbering plan matching means 33.
The number plan matching means 33 searches the storage means 31 using the telephone number 41 as a keyword, extracts number plan information 42 having the telephone number and the port address as records, and inputs the information to the exchange means 32. The exchange means 32 includes a port of the telephone device 20 and the telephone device 23.
To the port.

Next, a case will be described where a telephone call is made from the telephone device 20 to the telephone device 22 to a telephone device accommodated in another private branch exchange. When a call is made from the telephone device 20, the telephone number 41 is transmitted to the identification means 30 of the private branch exchange 10
Is input to The identification means 30 searches the storage means 31 using the telephone number 41 as a keyword, and extracts the numbering plan information 40 having the identification number and the telephone number 44 as records. Identification means 30
Inputs the identification number of the numbering plan information 40 to the identification information matching means 35. The identification information matching means 35 compares the identification number with the identification number of the private branch exchange 10, and confirms that the identification number of the numbering plan information 40 and the identification number of the private branch exchange 10 do not match.

In this case, the identification means 30 inputs the identification number and the telephone number 44 to the call control means 34. The call control means 34 transfers the telephone number and the identification number 44 to the private branch exchange 12 using the transmission line 51 corresponding to the identification number and the identification number of the telephone number 44. The operation of the private branch exchange 12 will be described with reference to a block diagram of the private branch exchange 10. The private branch exchange 12 inputs the telephone number and the identification number 44 received on the transmission line 51 to the identification information matching means 35. The identification information matching means 35 compares the telephone number and the identification number of the identification number 44 with the identification number of the private branch exchange 12 to confirm that they match.

When this is confirmed, the call control means 34 inputs the telephone number 45 to the number plan matching means 33. The number plan matching means 33 stores the storage means 31 using the telephone number 45 as a keyword.
And retrieves the numbering plan information 42 having the telephone number and the port address as records, and inputs it to the exchange means 32. The switching means 32 connects the port of the transmission line 51 and the port of the telephone device 22.

On the other hand, when the identification information matching means 35 compares the telephone number, the identification number of the identification number 44 and the identification number of the private branch exchange 12 and they do not match, the call control means 34
The port of the transmission line 51 is connected to a predetermined port of the transmission line, and the telephone number and the identification number 44 are transferred. As is apparent from the above description, whether the private branch exchange has the telephone number is determined based on the transferred identification number, so that the exchange procedure is simplified and the connection time can be reduced.

FIG. 2 is a block diagram showing an embodiment of a ring-shaped private branch exchange system according to the present invention.
52 is a transmission path.

A case where a telephone call is made from the telephone device 20 to the telephone device 21 will be described as an example. For example, the route selection method of the call control means 34 is determined by the telephone number, the identification number of the identification number 44, and the private branch exchange.
If the difference between the 10 identification numbers is positive, clockwise, if negative, counterclockwise,

[Equation 1] | (identification number of number 44) − (10 of private branch exchange
(Identification number) |> (number of connected private branch exchanges) / 2 The shortest path is determined by an algorithm that turns in the direction opposite to the sign when.

With this algorithm, the private branch exchange 10
The call control means 34 can select the shortest transmission path 50 to the telephone device 21 from the difference -1 between the identification number 9 and the identification number 10. After transmitting the telephone number and the identification number 44 to the transmission path 50, if there is no response, the call control means 34 transmits the telephone number and the identification number to the transmission path 51.
Send 44. The private branch exchange 12 has a telephone number and an identification number 44.
Is transferred to the private branch exchange 11 via the transmission line 52. As is clear from the above description, the number of vacant paths increases as compared with the case where the transmission path between the private branch exchanges is only one direction, so that the probability of being used as a relay path can be reduced.

The numbering plan information of all the private branch exchanges connected is input to, for example, the storage means of the private branch exchange 11 connected to the end. The private branch exchange 11 is a private branch exchange 10
Are connected via the transmission line 50, and the contents of the storage means of the private branch exchange 11 are transmitted to the storage 31 of the private branch exchange 10. The private branch exchange 10 stores the content received from the private branch exchange 11 in the storage means 31. The private branch exchange 10 is a private branch exchange 12
Are connected via a transmission line 51 and stored in the private branch exchange 10.
The contents of 31 are transmitted to the storage means of the private branch exchange 12. The private branch exchange device 12 stores the content received from the private branch exchange device 10 in the storage means. This operation is repeated until the contents of the storage means of the private branch exchange 11 are copied to all the private branch exchanges.

As is clear from the above description, since the information once input is copied via the transmission line, the input of the numbering plan information for each private branch exchange is integrated at one time to reduce the probability of error occurrence. Can be done.

[0018]

As described above, according to the present invention,
Stores the numbering plan information of all private branch exchanges connected to the private branch exchange system in each private branch exchange, and the private branch exchange to which the originating terminal is connected and in which the other terminal is accommodated. Since it is configured to be able to specify the telephone number, there is an advantage that the exchange means of the transferred telephone number in the private branch exchange can be simplified and the connection time can be shortened. Furthermore,
The private branch exchanges at both ends are connected to form a ring, and the shortest path is determined and connected so as to minimize the number of private branch exchanges to be relayed.Therefore, the transmission path between the private branch exchanges is used as a relay path. This has the advantage of reducing the probability that the Furthermore, since the routing information such as the numbering plan information input to a certain private branch exchange and the identification information of the private branch exchange is transmitted to other private branch exchanges connected to the private branch exchange system, This has the advantage that the input of the numbering plan information can be integrated to reduce the probability of occurrence of input errors.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a private branch exchange system of the present invention.

FIG. 2 is a block diagram showing an embodiment of a ring-type private branch exchange system according to the present invention.

[Explanation of symbols]

 10, 11, 12 Private branch exchange 20, 21, 22, 23 Telephone 30 Identification means 31 Storage means 32 Exchange means 33 Number plan collation means 34 Call control means 35 Identification information collation means 40, 42 Number plan information 41, 45 Telephone Number 44 Identification number and telephone number 50, 51, 52 Transmission line

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Katsumasa Ito 1-6-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (56) References JP-A-60-65641 (JP, A) 3-13095 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04M 3/00 H04M 3/16-3/20 H04M 3/38-3/58 H04Q 3/58-3 / 62

Claims (3)

(57) [Claims] In a private branch exchange system in which a plurality of private branch exchanges are connected, each private branch exchange includes a telephone number of a terminal, identification information given to a private branch exchange accommodating the terminal, A storage unit for storing numbering plan information including a port address corresponding to a terminal device accommodated in the private branch exchange device; a switching unit for switching connection between predetermined ports; and a telephone number input from a calling terminal device. The storage unit is queried to retrieve the identification information assigned to the private branch exchange accommodating the terminating terminal corresponding to the telephone number, input the identification information to the identification information collation unit, and receive the collation result. If the terminating terminal is accommodated in the private branch exchange, the telephone number is transferred to the numbering plan checking means, while the terminating terminal is accommodated in the other private branch exchange. In the case, the identification means for transferring the telephone number and the identification information to the call control means, the identification information collating means for collating the inputted identification information with the identification information of the private branch exchange and returning a result, and the telephone of the inputted terminating terminal device The number is referred to the storage means, a port address corresponding to the telephone number is extracted, the number plan matching means for transferring the port address to the exchange means, and the telephone number and the identification information received from the identification means are transmitted to another The private information is transferred to the private branch exchange, and the identification information received from the other private branch exchange is input to the identification information collating means to receive the collation result. Call control for transferring a number to a numbering plan collating unit and transferring a telephone number and identification information to another predetermined private branch exchange when the terminating terminal is accommodated in another private branch exchange. Means, the private branch exchange accommodating the calling terminal device receives the incoming call based on the identification information given to the private branch exchange device accommodating the receiving terminal device corresponding to the telephone number input from the calling terminal device. If the terminal device is housed in the private branch exchange device, connect the calling terminal device and the receiving terminal device,
If the terminating terminal device is accommodated in another private branch exchange, the telephone number and identification information are transferred to the other private branch exchange, and the other private branch exchange compares the transferred identification information with its own identification information. Until the private branch exchange to which the identification information is assigned is specified, the identification information and the telephone number are transferred to another private branch exchange, and the private branch exchange in which the calling terminal device is accommodated, and if necessary, the relay private branch A private branch exchange system comprising: a switching device, a private branch exchange accommodating a receiving terminal device, and a transmitting terminal device and a receiving terminal device connected to each other via a transmission line connecting them. 2. The private branch exchange system according to claim 1, wherein a plurality of private branch exchanges are connected in a ring shape, and identification information of a private branch exchange accommodating a calling terminal and a private branch exchange accommodating a called terminal. Based on this, it is configured to determine the shortest route that minimizes the number of private branch exchanges to be relayed, thereby connecting the two private branch exchanges, and to connect in the opposite direction if the shortest route is unavailable. Private branch exchange system characterized by the following. 3. The private branch exchange system according to claim 1, wherein the number planning information and the identification information of the private branch exchange are transmitted from any private branch exchange to all other private branch exchanges, and all other private branch exchanges are transmitted. A private branch exchange system, wherein the private branch exchange device is configured to receive and store the private branch exchange device.