JP2006140681A - Private branch exchange system and its charging method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a private branch exchange system which equalizes the telephone charge billed by a carrier to the telephone charge managed by a private branch exchange and reduces the telephone charge by installing a line control unit at a remote place where traffic is large. <P>SOLUTION: The private branch exchange system comprises the private branch exchange 2 installed in the head office in an area E1, the line control unit 3 installed in an office in an area E2 at a distance from the area E1, and an IP network NT which connects the private branch exchange 2 and line control unit 3 by using VoIP (Voice over Internet Protocol), and the private branch exchange 2 includes a charging means 8 comprising a control means 5, a storage means 6 of storing a route number acquisition table TA, a local station table TB, an MA coordinate table TC, and a domestic charging index table TD, and an input/output means 7 of inputting data and outputting a charging result. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a private branch exchange that accommodates a public network and an extension, and a private branch exchange system that is installed at a remote location from the private branch exchange and that is connected to a plurality of line controllers that accommodate the public network and the extension via an IP network. More particularly, the present invention relates to a private branch exchange system that charges a call charge when an outside line is dialed from a communication terminal accommodated in an extension of a private branch exchange or a line controller to the public network of the private branch exchange or the line controller via an IP network.

  The call charge when an external line is transmitted from a communication terminal connected to the private branch exchange to the public network is charged by the MA code coordinates (X coordinate and the private branch dial number) (the private branch telephone number). The distance between two points is calculated from the coordinates (X coordinate and Y coordinate) of the MA code corresponding to the Y coordinate) and the outside dial number, and this distance is calculated from the caller (extension communication terminal) to the callee (external dial number). The unit charge per unit second corresponding to the distance category determined by the telecommunications carrier (carrier) is determined, and the call charge corresponding to the call time is charged.

Further, as disclosed in “Patent Document 1” (packet billing system and method), a dial-up user who does not have a specific fixed IP address connected to the public network and accesses from an unspecified location. The billing for accessing the IP network can be a metered billing for packet traffic.
JP 2001-326634 A

  The private branch exchange at the head office and the private branch exchange or line controller at another office are connected via the IP network using VoIP (Voice over Internet Protocol) technology, and the extension communication terminal of the private branch exchange is connected via the IP network. When an outside line is dialed to the public network connected to the line controller at the office, the private branch exchange at the head office charges the call fee at the distance from the private branch exchange to the recipient of the outside dial call, and the telecommunications carrier Since the call charge charged by (carrier) is the call charge calculated from the distance from the other office to the called party, the call charge calculated by the private branch exchange and the call charged by the telecommunications carrier (carrier) The price is different.

  For example, assuming that the private branch exchange at the headquarters is installed in Tokyo, the line control unit at another office is installed in Osaka, and the outside line communication terminal in Tokyo sends an outside line to Osaka, the private branch exchange at the headquarters is While charges for calls between Tokyo and Osaka are charged, charges from telecommunications carriers (carriers) result in charges for local calls in Osaka, resulting in a significant difference.

  When trying to manage the call charges of the entire office with the private branch exchange at the head office, the call charges are completely different, and there is a problem that cannot be managed.

  The present invention has been made in order to solve such problems. The object of the present invention is to match the call charge charged by the carrier with the call charge managed by the private branch exchange, and to provide a line control device in a remote place with a lot of traffic. It is to provide a private branch exchange system that is installed and reduces call charges.

  In order to solve the above problems, a private branch exchange system according to the present invention comprises a private branch exchange that accommodates a public network and an extension, a plurality of line control devices that are installed at remote locations from the private branch exchange and accommodate the public network and the extension, In a private branch exchange system comprising an IP network in which an exchange and a plurality of line control devices are connected using VoIP, when the private branch exchange sends an outside line dial from a communication terminal accommodated in the extension, the private branch exchange or the line control device Route number capture table that captures outgoing dial routes from the public network to the public network, local station table that stores the local station numbers where private branch exchanges and line control units are installed corresponding to the route numbers, and by telecommunications carrier Means for storing the call charge calculation data table of the telephone, and calls made by outside line dialing from the communication terminal to the public network via the IP network When charging, determine the local station number of the private branch exchange or line controller that dialed the outside line to the public network from the route number corresponding to the dialed number dialed from the outside line, and from the determined local number to the dial number of the outside line dialing And charging means comprising control means for calculating a call charge based on the calculated distance.

  A private branch exchange of the private branch exchange system according to the present invention includes a route number capturing table for capturing a route of an outgoing dial from a private branch exchange or a line control device to a public network when a dial is transmitted from a communication terminal accommodated in an extension. A local station table that holds the local station number of the area where the private branch exchange and the line control device are installed corresponding to the number, a storage means for storing a call charge calculation data table for each telecommunications carrier, and an IP from the communication terminal When charging for a call made by dialing an external line to the public network via the network, determine the local station number of the private branch exchange or line controller that made the external line call to the public network from the route number corresponding to the dialed number dialed by the external line, Calculate the distance from the determined local number to the dial number for outgoing dialing, and call charges based on the calculated distance Because it is equipped with accounting means consisting of control means for calculation processing, outside line dialing from extension communication terminals is installed in an area close to the telephone number of outside line dialing via a preset route via the IP network By making a dial call from the line control device to the public network, the call charge calculated by the charging means can be matched with the call charge charged by the carrier.

  The accounting means according to the present invention is characterized by comprising input / output means for setting or changing the outgoing dial, the route number, and the local station number, and for outputting the call charge calculation result.

  The billing means according to the present invention includes an input / output means for setting or changing the outgoing dial, the route number, and the local station number, and outputting the call charge calculation result, so the line control device is added to a new area, Or, even when changing, it is possible to easily cope with operation by simply inputting or changing the outgoing dial, the route number, and the local station number.

  Furthermore, the storage means according to the present invention comprises an MA coordinate table that represents the area corresponding to the dial number for outgoing dialing and the area corresponding to the own station number by X coordinate and Y coordinate, respectively. Since the distance between the two points is calculated from the X coordinate and Y coordinate of the table, the distance from the corresponding private branch exchange or the line control device to the destination (the called party) of the outside line dial transmission is calculated.

  The storage means according to the present invention comprises an MA coordinate table representing the area corresponding to the dial number for outgoing dialing and the area corresponding to the own station number by X coordinate and Y coordinate, respectively. Since the distance between the two points is calculated from the X and Y coordinates, the distance from the corresponding private branch exchange or line control device to the destination of the outside line dialing (the called party) is calculated. Charge calculation table (domestic charge index table) can be applied.

  Also, the charging method of the private branch exchange system according to the present invention is a charging method for making an outside line dial transmission from the private branch exchange or the line control device to the public network via the IP network, and receiving the outside line dial number to the public network S1, step S2 for searching and determining the route number from the dial number, step S3 for searching and determining the own station number from the route number, and calculating the distance between the own station number and the outside dial number from the MA code Step S4 and step S5 for calculating a call charge from the call charge calculation data table are provided.

  The charging method for the private branch exchange system according to the present invention includes a step S1 for receiving an external dial number to the public network, a step S2 for searching and determining a route number from the dial number, and a search for the local station number from the route number. Step S3, step S4 for calculating the distance between the local station number and the outside dial number from the MA code, and step S5 for calculating the call charge from the call charge calculation data table. By selecting the private branch exchange or line controller that sends the outside line dial to the public network by calculating the route of the outside line number and the own station number, and calculating the distance between the own station number and the outside dial number from the MA code. Since the call charge is calculated, it can be matched with the call charge charged by the carrier.

  A private branch exchange of the private branch exchange system according to the present invention includes a route number capturing table for capturing a route of an outgoing dial from a private branch exchange or a line control device to a public network when a dial is transmitted from a communication terminal accommodated in an extension. A local station table that holds the local station number of the area where the private branch exchange and the line control device are installed corresponding to the number, a storage means for storing a call charge calculation data table for each telecommunications carrier, and an IP from the communication terminal When charging for a call made by dialing an external line to the public network via the network, determine the local station number of the private branch exchange or line controller that made the external line call to the public network from the route number corresponding to the dialed number dialed by the external line, Calculate the distance from the determined local number to the dial number for outgoing dialing, and call charges based on the calculated distance Because it is equipped with accounting means consisting of control means for calculation processing, outside line dialing from extension communication terminals is installed in an area close to the telephone number of outside line dialing via a preset route via the IP network By calling the public line from the line control device, the call charge calculated by the billing means and the call charge charged by the carrier can be matched, and the charge management is executed accurately and the call charge for the outside line Can be reduced.

  In addition, the billing means according to the present invention includes an input / output means for setting or changing the outgoing dial, the route number, and the local station number and outputting the call charge calculation result, so that the line control device is added to a new area. However, even if it is changed, it is possible to easily cope with operation by simply entering or changing the outgoing dial, route number, and local number, and appealing the convenience and expandability of the system. it can.

  Further, the storage means according to the present invention comprises an area corresponding to the dial number for outgoing dialing and an MA code representing the area corresponding to the own station number by X and Y coordinates, respectively, and the control means Since the distance between the two points is calculated from the X coordinate and the Y coordinate, calculating the distance from the corresponding private branch exchange or line control device to the outside dialing destination (the called party), the carrier corresponding to the distance is calculated. A call charge calculation table (domestic charge index table) can be applied, and the call charge can be charged accurately.

  The charging method for the private branch exchange system according to the present invention includes a step S1 for receiving an external dial number to the public network, a step S2 for searching and determining a route number from the dial number, and a local number from the route number. Step S3 for searching and determining, Step S4 for calculating the distance between the own station number and the outside dial number from the MA code, and Step S5 for calculating the call charge from the call charge calculation data table are provided. By determining the route of the external dial number to the network and the local station number, select the private branch exchange or line controller that sends the external line to the public network, and calculate the distance between the local number and the external dial number from the MA code The call charge is calculated to match the call charge charged by the carrier, and the charge management is performed accurately. It is possible to reduce the outside line calling rates.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The private branch exchange system according to the present invention is a corporate entity having a business office in each region. A private branch exchange is installed in the head office, a line control device is installed in each business office, and a connection between the private branch exchange and each line control device. In the case where the private branch exchange and each line control unit accommodate an extension communication terminal and a public network, respectively, the extension switch is connected to the public network via the IP network. When an outside line is dialed, the private branch exchange charges a call charge from the area where the outside line is dialed to the public network to the area of the destination telephone number, and manages them collectively.

  FIG. 1 is a system configuration diagram of an embodiment of a private branch exchange system according to the present invention. In FIG. 1, a private branch exchange system 1 includes a private branch exchange 2 installed at a head office in a region E1, a line control device 3 installed at a business office in a region E2 that is remote from the region E1, and a private branch exchange 2 and a line. It is constructed from an IP network NT that connects the control device 3 using VoIP (Voice over Internet Protocol).

  The private branch exchange 2 includes a communication path switch 4, a control unit 5, a storage unit 6, an input / output unit 7, a station line trunk COT, line circuits LIN1 to LINk, and an IP trunk IPT, and the public network NT1 through the station line trunk COT. And the extension telephones TEa1 to TEak constituting the extension communication terminals via the line circuits LIN1 to LINk. The private branch exchange 2 is connected to the IP network NT via the IP trunk IPT.

  The line control device 3 accommodates the public telephone network NT2 and the extension telephones TEb1 to TEbn constituting the extension communication terminals. Further, the line control device 3 is connected to the IP network NT via the LAN and the router RT. An IP phone TEp is connected to the LAN.

  The communication path switch 4 is controlled by the control means 5 so that the communication path between the local line trunk COT and the line circuits LIN1 to LINk, the communication path between the line circuits LIN1 to LINk, and between the line circuits LIN1 to LINk and the IP trunk IPT. A communication path and a communication path between the local trunk COT and the IP trunk IPT are formed.

  The control means 5 comprises a CPU or the like, and controls the connection operation of the speech path switch 4, the data storage operation and data read operation of the storage means 6, the data input operation and data output operation of the input / output means 7, and the call connection operation. Execute.

  In addition, the control means 5 is charged from the extension telephones TEa1 to TEak for the external line call originating from the external line via the public network NT1, and from the extension telephones TEa1 to TEak to the IP network NT → router RT → LAN → line control device 3 → public. The billing process of the outside line call of outside line dialing via the network NT2 is controlled.

  Further, the control means 5 is charged from the extension telephones TEb1 to TEbn for the external line call originating from the external line via the public network NT2, and from the extension telephones TEb1 to TEbn to the LAN → router RT → IP network NT → private branch exchange 2 → public network. Controls the billing process for an outside line call of outside line dialing via NT1.

  The storage means 6 is composed of a rewritable memory such as an EEPROM or a flash memory, and stores operation program data, station data, etc. of the control means 5.

  The storage means 6 includes a route number capture table used for a route for dialing an outside line, a local station table that is a dial number of the private branch exchange 2 or the line control device 3, an MA coordinate table that represents a region in coordinates, and an accounting calculation. Stores the domestic billing index table used for.

  The input / output means 7 is composed of a keyboard, a display, a printer, and the like. The input / output means 7 sets and changes the route number capture table, the local station table, the MA coordinate table, and the domestic billing index table stored in the storage means 6 and calculates Output billing result of call charge.

  The control means 5, the storage means 6 and the input / output means 7 constitute a charging means 8.

  A case will be described in which an outside line dial is transmitted from the extension telephone TEa1 to a partner (for example, a subscriber telephone) connected to the public network NT2. There are two connection routes when the extension telephone TEa1 dials to the other party connected to the public network NT2.

  The first route is private branch exchange 2 → public network NT1 → international exchange (not shown) → public network NT2 → the other party, and the call charge is the toll charge from area E1 to area E2. .

  The second route is the private branch exchange 2 → IP network NT → line control device 3 → public network NT2 → destination, and if the call charge of the IP network NT is excluded as a fixed amount, the call charge is the local call in the region E2. It becomes a charge. Note that the call charge for the IP network NT can be charged by equally allocating the traffic amount used in the private branch exchange 2 and the line control device 3 and adding it to the local call charge in the region E2. Alternatively, the call charge for the IP network NT may be separately recorded as a communication charge.

  The same applies to a case where an outside line dial is transmitted from the extension telephone TEb1 to a partner (for example, a subscriber telephone) connected to the public network NT1.

  When making a long distance (outside line) dial transmission with the second route, a route via the IP network NT is selected from the caller (for example, the extension telephone TEa1 or the extension telephone TEb1), and the public network NT1 or the public network NT2 is selected. Determine the local station number of the private branch exchange 2 or the line control device 3 to be dialed, calculate the distance from the local station number area E1 or area E2 to the telephone number area of the called party (subscriber telephone), and the calculated distance The call charge can be charged by the private branch exchange 2 by calculating the call charge using the charge index table provided by the telecommunications carrier based on the above.

  FIG. 2 is an image of an embodiment of the route number acquisition table according to the present invention. In FIG. 2, the route number capture table TA is stored in the storage area of the storage means 6 and includes a captured route number TA2 corresponding to the outgoing dial TA1.

  The outgoing dial TA1 is represented by, for example, two digits of the long distance dial number, and is set from “09” in Kyushu / Okinawa to “01” in Hokkaido, and the private branch exchange 2 shown in FIG. When the line control device 3 is installed in Osaka, for example, the outgoing dial TA1 covered by the private branch exchange 2 is set as “0000” from Hokkaido “01” to Nagoya region “05”. Is set to “0001” from Osaka “06” to Kyushu / Okinawa “09”.

  In addition, in the case where the number of establishments is increased and the area where the line control device is installed is increased, “09” to “01” of the outgoing dial TA1 covered by each line control device is subdivided, for example, three digits of the toll dial number Expressed from “09x” to “01y”, the acquisition route number TA2 can also correspond to “0002” to “000k” according to the increase in the number of line control devices. The outgoing dial TA1 and the capture route number TA2 are input and set from the input / output means 7 as station data when the private branch exchange 2 and the line control device 3 are installed.

  FIG. 3 is an image diagram of an embodiment of the own station table according to the present invention. In FIG. 3, the own station table TB is stored in the storage area of the storage means 6 and includes the own station number TB2 corresponding to the route number TB1.

  The private station number TB2 of the private branch exchange 2 (Tokyo) corresponding to the route number TB1 “0000” is, for example, “0333384”, and the local station of the line control device 3 (Osaka) corresponding to the route number TB1 “0001”. Since the number TB2 is “0612345”, for example, the route number “0000” is a route number when dialing from the private branch exchange 2 to the public network NT1, and the route number “0001” is the public number from the line control device 3. This is a route number for dial transmission to the network NT2, and all route numbers are unique numbers managed centrally by the private branch exchange 2.

  In addition, in the case where the number of establishments is increased and the area where the line control device is installed is increased, the local number TB2 “0k...” Of the line control device corresponding to the route numbers TB1 “0002” to “000k” is changed from “0z. It becomes possible to respond by setting. The route number TB1 and the own station number TB2 are input and set from the input / output means 7 as station data when the private branch exchange 2 and the line control device 3 are installed.

  FIG. 4 is an image diagram of an embodiment of the MA coordinate table according to the present invention. In FIG. 4, the MA coordinate table TC is stored in the storage area of the storage unit 6 and is represented by X coordinates x1, Y coordinates y1 to X coordinates xn, and Y coordinates yn corresponding to the areas E1 to En.

For example, the distance r between the region E2 and the region Ek can be calculated by r = √ {(xk−x2) ² + (yk−y2) ² } by using the Vitagora's theorem.

  FIG. 5 is an image diagram of an embodiment of the domestic billing index table according to the present invention. In FIG. 5, a domestic billing index table TD is a billing table for billing presented for each telecommunications carrier (carrier).

  When the distance r between the two points to be talked is calculated from the MA coordinate table TC shown in FIG. 4, the division number is determined, and the day, night, midnight, weekday, holiday (including holidays), and talk time are determined. Accordingly, the call charge is calculated, and the call charge can be charged. Note that the data of the domestic billing index table TD is preset as an initial value, and is data that can be changed from the input / output means 7 when the charge of each carrier is revised.

  As described above, the storage means 6 according to the present invention is an MA that represents the area (area Ek) corresponding to the dial number for outgoing dialing and the area (area E2) corresponding to the local station number by the X coordinate and the Y coordinate, respectively. Since the control means 5 calculates the distance r between the two points from the X coordinate and the Y coordinate of the MA code, the destination of the outside line dialing from the corresponding private branch exchange 2 or the line control device 3 (the called party) By calculating the distance r, the carrier call charge calculation table (domestic charge index table TD) corresponding to the distance r can be applied, and the call charge can be charged accurately.

  In addition, the billing means 8 according to the present invention includes the input / output means 6 for setting or changing the outgoing dial, the route number, and the local station number and outputting the call charge calculation result. Even when expanding or changing in the area, you can easily respond to the operation by simply entering or changing the outgoing dial, route number, and local number, and appealing the convenience and expandability of the system can do.

  For example, the private branch exchange 2 is installed in Tokyo (own station number: 0333684), the line control device 3 is installed in Osaka (own station number: 0612345), the route number capture table TA is as shown in FIG. 2, and the own station table TB is as shown in FIG. When the long distance dial transmission is made from the extension telephone TEa1 of the private branch exchange 2 installed in Tokyo to the Osaka subscriber telephone (telephone number: 06-9876-5432), the captured route is acquired from the route number capturing table TA. The number TA2 “0001” is captured, and the local station number TB2 “0612345” of the line control device 3 is determined, so that the private branch exchange 2 in Tokyo transfers to the subscriber telephone in Osaka (phone number: 06-9976-5432). Rather than the distance of the long distance dial transmission, from the Osaka line control device 3 to the Osaka subscriber telephone (telephone number 06-9876-5432) It will be the billing operations of call rates at a distance of city dialing.

  Further, when a long distance dial transmission is made from the extension telephone TEb1 of the line control device 3 installed in Osaka to the subscriber phone in Tokyo, the private branch exchange 2 in Tokyo is not the distance from the line controller 3 in Osaka to the subscriber phone in Tokyo. Call charges are calculated at the distance from the phone to the subscriber phone in Tokyo.

  Furthermore, assuming that a line control device is installed in an area such as Kyushu or Hokkaido, and a route number capture table TA and an own station table TB are added and registered, an outside line is transmitted to each area. It is possible to calculate a call charge based not on the distance from Osaka but on the distance from the line control device close to each area where the outside line is dialed.

  As described above, the private branch exchange 2 of the private branch exchange system 1 according to the present invention has the private branch exchange 2 when the outside line is transmitted from the communication terminals (extension telephones TEa1 to TEak and extension telephones TEb1 to TEbn) accommodated in the extension. Alternatively, a route number capture table TA that captures a route of an outgoing dial from the line control device 3 to the public network (NT1, NT2) and an area (E1) where the private branch exchange 2 and the line control device 3 are installed corresponding to the route number TB1. , E2) own station table TB holding the own station number TB2, storage means 6 for storing a call charge calculation data table (domestic charging index table TD) for each telecommunications carrier, and the IP network NT from the communication terminal. When charging for calls made by outside line dialing to the public networks NT1 and NT2 via the The local station number TB2 of the private branch exchange 2 or the line control device 3 that has made an external dial transmission from the route number TB1 to the public networks NT1 and NT2 is determined, and the distance r from the determined local station number TB2 to the dial number of the external dial transmission is determined. Since the charging means 8 comprising the control means 5 for calculating and processing the call charge based on the calculated distance r is provided, the outside line dial transmission from the extension communication terminal passes the preset route via the IP network. Then, by dialing to the public network from the line control device installed in the area close to the telephone number of outside line dialing, it is possible to match the call charge calculated by the charging means with the call charge charged by the carrier, The billing management can be executed accurately and the call charges for the outside line can be reduced.

  Next, a charging method for the private branch exchange system will be described. FIG. 6 is an operation flowchart of one embodiment of the accounting method for the private branch exchange system according to the present invention. Refer to FIG. 1 for the operation flow.

  In FIG. 6, the charging method of the private branch exchange system according to the present invention is a charging method in which an outside line is dialed from the private branch exchange or the line controller to the public network via the IP network. Receive a dialed number. The operation of step S1 is executed by the control means 5 of the charging means 8.

  In step S2, the route number is searched from the dial number and determined. The operation of step S2 is executed by the control means 5 and the storage means 6 of the charging means 8.

  In step S3, the local station number is searched and determined from the route number. The operation of step S3 is executed by the control unit 5 and the storage unit 6 of the charging unit 8.

  In step S4, the distance between the local station number and the outside line dial number is calculated from the MA code. The operation of step S4 is executed by the control means 5 and the storage means 6 of the charging means 8.

  In step S5, a call charge is calculated from the call charge calculation data table. The operation of step S5 is executed by the control unit 5 and the storage unit 6 of the charging unit 8.

  As described above, the charging method for the private branch exchange system according to the present invention includes the step S1 for receiving an outside line dial number to the public network, the step S2 for searching and determining the route number from the dial number, and the local station from the route number. Since step S3 for searching and determining the number, step S4 for calculating the distance between the local station number and the outside line dial number from the MA code, and step S5 for calculating the call charge from the call charge calculation data table are provided. A private branch exchange or a line control device that transmits an external dial to the public network is selected by determining the route of the external dial number to the public network and the local station number, and the distance between the local code and the external dial number from the MA code. To calculate the call charge so that it can match the call charge charged by the carrier. Monitor, it is possible to reduce the call charges of the outside line.

  The private branch exchange system according to the present invention matches the call charge charged by the carrier with the call charge managed by the private branch exchange, and reduces the call charge by installing a line control device in a remote place with a lot of traffic. The present invention can be applied to any private branch exchange system that is installed in a different area and is connected via an IP network and a private communication terminal accommodated in a line control device that transmits an outside line via a public network.

System configuration diagram of an embodiment of a private branch exchange system according to the present invention An image of an embodiment of a route number acquisition table according to the present invention One embodiment image diagram of own station table according to the present invention An embodiment image diagram of the MA coordinate table according to the present invention An embodiment image diagram of a domestic billing index table according to the present invention Operational flow diagram of one embodiment of a billing method for private branch exchange system according to the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Private branch exchange system 2 Private branch exchange 3 Line controller 4 Communication path switch 5 Control means 6 Memory | storage means 7 Input / output means 8 Billing means COT Local line trunk LIN1-LINk line circuit IPT IP trunk RT router NT1, NT2 Public network NT IP network TEa1 to TEak extension telephones TEb1 to TEbn extension telephones TEp IP telephones TA route number acquisition table TA1 outgoing dial TA2 acquisition route number TB Local station table TB1 Route number TB2 Local station number TC MA coordinate table TD Domestic billing index table

Claims (4)

VoIP using a private branch exchange that accommodates a public network and an extension, a plurality of line control devices that are installed at remote locations from the private branch exchange, accommodate the public network and the extension, and the private branch exchange and the plurality of line control devices using VoIP In a private branch exchange system consisting of a connected IP network,
The private branch exchange corresponds to a route number capture table and a route number for capturing a route of an outgoing dial from the private branch exchange or the line control device to the public network when an outside line dial is transmitted from a communication terminal accommodated in an extension. A local station table that stores the local station number of the area where the private branch exchange and the line control device are installed, a storage means for storing a call charge calculation data table for each telecommunications carrier, and the communication terminal to the IP network. When charging for a call made by dialing an external line to the public network via the network, the local number of the private branch exchange or the line controller that made the external line call to the public network from a route number corresponding to the dialed number dialed by the external line Determine the distance from the determined local number to the dialed number for outgoing dialing, and use the calculated distance. Private branch exchange system, characterized in that it comprises a control means for call billing process Zui, a charging means made of. 2. The private branch exchange system according to claim 1, wherein said charging means includes an input / output means for setting or changing the outgoing dial, the route number, and the local station number and outputting a call charge calculation result. The storage means includes an MA code representing an area corresponding to a dial number for outgoing line dialing and an area corresponding to an own station number by an X coordinate and a Y coordinate, respectively, and the control means includes an X coordinate in the MA coordinate table. 2. The private branch exchange system according to claim 1, wherein a distance between the two points is calculated from the Y coordinate. A billing method for a private branch exchange system in which an outside line dial is transmitted from a private branch exchange or a line controller to a public network via an IP network,
Receiving an outside line dial number to the public network;
Step S2 for searching and determining the route number from the dial number;
Step S3 for searching and determining the own station number from the route number;
Step S4 for calculating the distance between the own station number and the outside dial number from the MA code;
Calculating a call charge from the call charge calculation data table;
A charging method for a private branch exchange system comprising:

Images