JP2006157682A - VoIP TELEPHONE EXCHANGE SYSTEM AND CHARGING CONTROL METHOD THEREOF - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a VoIP telephone exchange system and charging control method thereof for performing charging control on a PBX accommodated terminal that originates a VoIP phone call. <P>SOLUTION: If there is a call connection request from a PBX accommodated terminal 20 under the environment of an ISP network 12 to a general terminal 26 under the environment of another carrier network 24, in a VoIP telephone exchange system 10, an IP phone exchange device 14 that receives, from the carrier network 24, a call arrival response notification from the general terminal 26, detects whether the call connection is caller charging or caller non-charging from charging information in the call arrival response notification, and a call arrival response message with an inversion instruction parameter set thereto is transmitted to a CPE 16 in accordance with a result of the detection. In the CPE 16, whether a polarity of a voltage level is to be inverted or not to be inverted is controlled in accordance with the inversion instruction parameter in the call arrival response message and a call arrival reaction signal is transmitted to a PBX 18. Thus, the PBX 18 is capable of performing appropriate charging management on the PBX accommodated terminal 20 that originates a call to a terminal to provide a call arrival charging service. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to charging control for a PBX-accommodating terminal for making a VoIP telephone call, for example, in a VoIP (Voice over Internet Protocol) telephone switching system and its charging control method.

  Conventionally, in a VoIP telephone switching system, a gateway (Media Gateway: MG) that connects a terminal device and a network and a gateway control device (Media Gateway Controller: MGC) that controls the MG are arranged, and MGCP (Media Gateway) Control protocol) and VoIP signaling protocol based on master / slave architecture such as H.248 / Megaco (Media Gateway Control). A device that establishes and controls a call with a master and an MG as a slave is known.

  In such a VoIP telephone switching system, the MGC can manage and control a plurality of MGs, and can manage at least information for identifying each MG and information on how to control each MG.

  For example, when the MG connected to the network is turned on and the initial setting is completed and becomes available, it notifies the MGC that controls the MG that it has become available. The MG sets in advance which MGC controls itself.

  On the other hand, the MGC can recognize which MG is to be controlled, and manages the operating conditions related to each MG. Upon receiving this availability notification, the MG that issued the notification is the control target. Recognizing this, the operation condition related to the MG is detected and instructed.

  After that, the MG operates according to the operating conditions instructed by the MGC. For example, when the telephone handset connected to the MG is lifted and the MG is notified of the off-hook, the MG notifies the MGC of the off-hook accordingly, The dial tone is transmitted to this telephone, digits dialed from this telephone are collected, and when dialing is completed, the collected digits are notified to the MGC and the next instruction is waited.

  The MG connects to a private branch exchange (PBX) and receives a signal indicating an incoming call response from the called party when a terminal accommodated in the PBX makes a call via the PBX and the MG. In response to the incoming call response signal, the MG outputs the inverted polarity of the voltage level to the transmission line to which the PBX is connected, and notifies the PBX that the called party has responded.

  The PBX determines the polarity of this voltage level, detects inversion to confirm the establishment of the notification, and starts charging the subscriber who uses the PBX accommodating terminal.

  In addition, when the caller or the called party is on-hooked and the call is terminated, the MG reverses the polarity of the voltage level again to end the billing.

  By the way, in the public switched telephone network provided with the calling telephone number notification service described in Patent Document 1, when the exchange receives the collect call call request dial from the calling side, The communication terminal adds a code indicating that a request has been made, and detects the collect call call request information detected by detecting the call phone number and the presence / absence of the collect call call request from the received call number identification information at the communication terminal. Accordingly, it is possible to set whether or not to automatically receive and respond to the collect call call request.

  Further, in the service system start date setting method of the billing system described in Patent Document 2, it is detected that the customer terminal 1001 is connected to the network, and the customer information and connection date information of the terminal 1001 is recorded. A terminal connection date and time information recording unit 1008 is provided, and a start date and time is set by providing a user terminal connection date and time information collecting unit 1009 that collects customer information and connection date and time information of the usage terminal 1001 based on the recording of the recording unit 1008. In the start date setting unit 1010, it is possible to set the date and time when the use terminal 1001 is actually connected and the power is turned on as the service start date and time, and it is possible to calculate an appropriate usage fee and collect an appropriate usage fee.

JP 2001-148750 A JP2003-289321

  However, in the above VoIP telephone switching system, since all call connections that detect voltage level polarity reversal in the PBX are determined to be charged, an incoming charging service in which the caller is charged instead of the caller, for example, Even if a subscriber who provides free dialing is dialed using a PBX accommodating terminal in this VoIP telephone exchange system, the caller is charged.

  For example, in a VoIP telephone switching system, when a PBX-accommodating terminal is used to dial a subscriber who provides an incoming billing service, the MGC can determine that the call connection is not a caller. However, the MG receives a signal notifying the incoming call response from the called party, reverses the polarity of the voltage level, and outputs it to the PBX. In response to this polarity reversal, the PBX determines that the call connection is caller-billed, charges the caller's PBX-accommodating terminal, and subscribers who use this terminal are supposed to be free calls. You will be charged a fee.

  The present invention eliminates such drawbacks of the prior art, and uses a PBX-accommodating terminal to perform appropriate charging management and control for a calling party who makes a VoIP telephone call to a called party that provides an incoming charging service. An object of the present invention is to provide a VoIP telephone exchange system to be performed and a charging control method thereof.

  In order to solve the above-mentioned problems, the present invention includes an IP telephone switching apparatus and one or more subscriber premises apparatuses arranged in a network environment using the Internet Protocol (IP). The device is connected to the subscriber premises device via the IP network to execute call control, and the subscriber premises device is connected to a private branch exchange that accommodates one or more PBX-accommodating terminals and connected to an IP telephone control signal. This private branch exchange has a charge management function for this PBX-accommodating terminal, detects the polarity of the voltage level of the incoming response signal supplied from this subscriber premises equipment, and detects this polarity reversal In this case, the VoIP telephone switching system, which controls charging as caller billing in the case of non-calling when the call is not detected, sends a call connection request from this PBX accommodating terminal, and the called party's terminal responds to this request. When an incoming call is received and a response is notified, the incoming call response notification is transmitted to the IP telephone exchange device, and the IP telephone exchange device transmits an incoming call response message corresponding to the incoming call response notification to the subscriber premises device. In this case, it is determined whether the call connection is caller charged or caller uncharged, and based on the determination result, only when the call connection is caller charged, Parameter addition means for adding a reversal instruction parameter instructing reversal of the polarity of the voltage level to this incoming response message, and this subscriber premises equipment transmits an incoming response signal to this private branch exchange in response to this incoming response message And a polarity reversing control means for controlling reversal of the polarity of the voltage level of the incoming response signal according to the inversion instruction parameter in the incoming response message. It is characterized by.

  In addition, in this VoIP telephone switching system in which an IP telephone switching apparatus and one or more subscriber premises equipment are arranged in a network environment using the Internet Protocol (IP), this IP telephone switching apparatus is connected to the IP network. The subscriber premises equipment is connected to the subscriber premises equipment to perform call control, and the subscriber premises equipment is connected to a private branch exchange accommodating one or more PBX-accommodating terminals to perform IP telephone control signal processing. In the exchange, charge management of this PBX-accommodating terminal is performed, the polarity of the voltage level of the incoming response signal supplied from this subscriber premises equipment is detected, and when this polarity inversion is detected, the caller is charged and detected If the PBX accommodating terminal sends a call connection request and the called party's terminal receives an incoming call and notifies the response in response to this request, This call connection notification is sent to this IP telephone exchange, and when this IP telephone exchange sends an incoming response message corresponding to this call response notification to this subscriber premises equipment, this call connection is transmitted. Whether the caller is charged or caller is not charged, and based on the determination result, only if this call connection is caller charge, instruct to reverse the polarity of the voltage level of this incoming response signal A parameter addition step of adding a reverse instruction parameter to the incoming response message, and when the subscriber premises equipment transmits the incoming response signal to the private branch exchange in response to the incoming response message, A polarity inversion control step for controlling inversion of the polarity of the voltage level of the incoming response signal according to the inversion instruction parameter is included.

  According to the VoIP telephone switching system of the present invention, when there is a call connection request from a PBX accommodating terminal in an ISP network environment to a general terminal in another carrier network environment, an incoming call response notification from the general terminal is transmitted to the carrier. In an IP telephone switching device that receives from the network, it detects whether this call connection is caller charge or caller non-charge from the charge information in the incoming call response notification, and the incoming call is set with a reverse instruction parameter according to the detection result By sending a response message to the CPE and controlling the polarity inversion and non-inversion of the voltage level according to the reverse indication parameter of the incoming response message at the CPE, the PBX transmits the incoming response signal to the PBX. Appropriate billing management is performed for the PBX-accommodating terminal that sends to the service providing terminal, and there is a discrepancy between the billing information determined by the IP telephone exchange and the billing information of the PBX It is possible to prevent.

  In the VoIP telephone switching system of the present invention, in the IP telephone switching apparatus, the identification information of the terminal that provides the incoming call charging service among the PBX accommodating terminals in the ISP network environment is stored in the storage unit, and the ISP network environment When there is a call connection request from a given PBX-accommodating terminal to another predetermined PBX-accommodating terminal, an incoming call response notification is received and the identification information of the called PBX-accommodating terminal included in the incoming call response notification is stored Whether the call connection is caller charged or caller non-charged, and an incoming call response message in which a reverse instruction parameter is set according to the determination result is sent to the CPE. , It is possible to manage charging even for outgoing calls to a PBX-accommodating terminal that provides an incoming charging service in an ISP network environment.

  Embodiments of a VoIP telephone switching system according to the present invention will now be described in detail with reference to the accompanying drawings. For example, in the VoIP telephone switching system 10 of the present invention, as shown in FIG. 1, an IP telephone switching apparatus 14 is arranged in an environment of an Internet Service Provider (ISP) network 12, and a customer premises apparatus (Customer Premise) Equipment: CPE) 16 Private branch exchange (PBX) 18 accommodated in a private branch exchange 20 and a general network accommodated in a carrier network 24 connected via a gateway (GW) 22 In the present invention, charging control of each terminal is performed. Note that portions not directly related to understanding the present invention are not shown and redundant description is avoided.

  In the VoIP telephone switching system 10 of the present embodiment, an ISP that provides this ISP network 12 environment provides an IP telephone service to its subscribers.

  In this embodiment, the ISP network 12 is a network using the Internet Protocol (IP), and as this Internet protocol, Media Gateway Control Protocol (MGCP) or H.248 (ITU) -T Recommendation) / Voice over Internet Protocol (VoIP) signaling protocol based on master / slave type architecture such as MEGACO (Media Gateway Control), etc. A VoIP signaling protocol based on a client-server architecture such as a compliant protocol may be used.

  In the present embodiment, the ISP network 12 may be connected to a large number of CPEs, but only the CPE 16 is shown in FIG.

  The IP telephone exchange device 14 accommodates the GW 22 and connects to the CPE 16, and manages the subscriber information necessary for providing the call control function and the IP telephone service for the GW 22 and the CPE 16. Has a database function.

  When there is a call control request originating from the PBX accommodating terminal 20, the IP telephone exchange device 14 of the present embodiment receives an incoming response notification from the called party to the PBX accommodating terminal 20, and responds to this incoming response notification. When an incoming response message is sent to CPE 16, an original parameter is added and set.For example, the reverse instruction parameter is set and the voltage level when CPE 16 sends a response signal to PBX 18 is set. Control polarity inversion and non-inversion.

  For example, when the PBX accommodating terminal 20 requests a call connection with the general terminal 26 and the general terminal 26 transmits an incoming call response notification to the PBX accommodating terminal 20, the IP telephone exchange apparatus 14 transmits the GW 22 from the carrier network 24. It is determined whether the call connection is caller charge or caller non-charge according to the charge information included in the incoming call response notification supplied via the caller. Furthermore, as a result of this determination, the reverse instruction parameter is set to the reverse instruction only when the call connection is caller charging, and when the call connection is not charged, the reverse instruction parameter is set to the non-reverse instruction.

  CPE 16 is installed at the subscriber's home and functions as a GW. For example, the function to realize Internet connection using the IP address assigned by ISP, the signal of telephone service and the signal of IP service such as ADSL Is connected to the splitter function, analog telephone (not shown) or PBX 18 that mixes the signals in the reverse direction and control signal processing and voice codec etc. to realize these IP telephone services Function, function for exchanging control signals related to IP phone control signal processing using endpoint identifier including MAC address based on assigned IP address as identification information unique to CPE, and connected analog telephone or It has a function to provide PSTN telephone service using PBX 18.

  In particular, the CPE 16 of this embodiment controls the polarity inversion and non-inversion of the voltage level of the transmission line connected to the PBX 18 according to the incoming response message supplied from the IP telephone exchange device 14, and sends the response signal to the PBX. Send to 18. For example, CPE 16 inverts the polarity of the voltage level of the response signal when the inversion instruction parameter in the incoming response message indicates an inversion instruction, and transmits it without inverting the polarity of the voltage level of the response signal when indicating the non-inversion instruction. To do.

  The PBX 18 is a private branch exchange that accommodates PBX-accommodating terminals 20 such as analog telephones. The PBX 18 has a function for performing exchange processing between terminals accommodated in the same PBX, accommodated in the accommodated terminals, and other PBXs and telephone networks. A function of selecting a trunk necessary for connection to a terminal to be connected, connecting to the CPE 16 or the carrier network 24, and the like, and a charge management function for incoming / outgoing calls of the accommodated terminal.

  In this embodiment, the PBX 18 performs billing management according to the response signal supplied from the CPE 16. For example, the polarity of the voltage level of the response signal is detected, and when the inversion of this polarity is detected, the caller is charged, and when not detected, the charge management is controlled as the caller is not charged.

  In this embodiment, the PBX 18 may be connected to many PBX-accommodating terminals, but only the PBX-accommodating terminal 20 is shown in FIG.

  The PBX accommodating terminal 20 may be, for example, an analog telephone. In this embodiment, the PBX accommodating terminal 20 is accommodated in the PBX 18 after joining the ISP, and is connected to the ISP network 12 via the CPE 16.

  The GW 22 is a protocol converter for interconnecting networks having different protocol systems, and may have a media exchange function between the IP network and the public switched telephone network. In cooperation, the ISP network 12 and the carrier network 24 are connected. For example, the GW 22 is a signaling gateway that connects to the public switched telephone network in the carrier network 24 to exchange calls, and a signaling gateway that connects to the No. 7 common line signal network in the carrier network 24 to exchange call control signals. It may have a (Signaling Gateway) function.

  The carrier network 24 is an original network by a carrier (communication carrier) other than the ISP that provides the ISP network 12, and the carrier network 24 in this embodiment provides a public switched telephone network (PSTN) service. The network may be provided, and may include a common line signal network such as No. 7 common line signal system (not shown).

  Further, although not shown, the carrier network 24 made of PSTN may have a private branch exchange such as a subscriber exchange or a relay exchange. For example, the general terminal 26 notifies the incoming call response in response to a call connection request to the general terminal 26. When transmitting, it is advisable to add charging information through such a private branch exchange. In this embodiment, the billing information can include information indicating that this call connection is caller billing or caller non-billing.

  In the present embodiment, the carrier network 24 may be connected to a large number of general terminals. However, in order to avoid complication of the drawing, only the general terminals 26 are shown in FIG.

  The general terminal 26 may be, for example, an analog telephone. In this embodiment, the general terminal 26 is accommodated in the carrier network 24 and may be connected to a private branch exchange (not shown).

  Some of the general terminals 26 accommodated in the carrier network 24 provide an incoming billing service. The terminals are not limited to those using a special number such as a free dial (registered trademark) as a telephone number. There may be a terminal that is set as non-billing for the telephone number under the environment.

  Next, the operation of the VoIP telephone switching system 10 in this embodiment will be described with reference to the sequence chart of FIG. 2 and the flowchart of FIG. 3 for the operation of transmitting the incoming call response notification from the general terminal 26 to the PBX accommodating terminal 20. To do.

  In this embodiment, first, in response to a call from the PBX accommodating terminal 20, a call setting request is supplied to the general terminal 26 by a normal call connection sequence 102.

  The general terminal 26 outputs a callee response 104 corresponding to the call setting request to the carrier network 24 (step 202). This callee response 104 may be issued, for example, by a handset off-hook at the general terminal 26.

  This called party response 104 is transmitted from the carrier network 24 via the GW 22 to the IP telephone switching apparatus 14 as a called party response 106 using, for example, the No. 7 common line signaling method. The callee response 106 from the carrier network 24 that is a PSTN includes billing information, and the billing information in this embodiment includes information indicating that this call connection is caller billing or caller non-billing.

  In the IP telephone exchange device 14, in response to the callee response 106, an incoming call response message 108 notifying that the callee has responded is transmitted to the CPE 16. At this time, in the IP telephone exchange device 14 of the present embodiment, it is determined in particular whether the call connection is caller charge or caller non-charge according to the charge information included in the callee response 106 ( Step 204), parameters of the incoming call response message 108 are set according to the determination result.

  In the present embodiment, an inversion instruction parameter is added to the incoming response message 108 so that the polarity inversion of the voltage level when the CPE 16 transmits the response signal 110 can be controlled. In the IP telephone exchange device 14, when the charging information of the callee response 106 indicates caller charging, a reversal instruction for reversing the polarity is set in the reversal instruction parameter (step 206). A non-inversion instruction not to be inverted is set as an inversion instruction parameter (step 214).

  Next, in response to the incoming call response message 108, the CPE 16 transmits a response signal 110 indicating the response of the called party to the PBX 18. At this time, in the CPE 16 of this embodiment, when the inversion instruction parameter of the incoming response message 108 is the inversion instruction, the response signal 110 is transmitted with the polarity of the voltage level of the transmission line to the PBX 18 inverted (step 208). On the other hand, in the case of a non-inversion instruction, the voltage level is transmitted without being inverted (step 216).

  In the PBX 20 of this embodiment, the charge management is controlled by judging the polarity of the voltage level of the supplied response signal 110. If the polarity of the voltage level of the response signal 110 is inverted, this call connection is called by the caller. When it is determined that the charge is made and the subscriber of the PBX accommodating terminal 20 is charged normally (step 210), if the polarity of the voltage level is not reversed, the call connection is not established. It is determined that the charge is made, and management is performed so as not to charge the subscriber of the PBX accommodating terminal 20 (step 218).

  Further, in response to the supplied response signal 110, the PBX 18 transmits a response signal 112 indicating the response of the called party to the PBX accommodating terminal 20, and a call 114 between the PBX accommodating terminal 20 and the general terminal 26 is started. (Steps 212 and 220).

  As another embodiment, the VoIP telephone switching system 10 associates the charging information indicating whether or not the general terminal 26 in the environment of the carrier network 24 provides the incoming charging service with the identification information of the general terminal 26. If there is a call connection that is stored in the IP telephone switching device 14 and sent from the PBX accommodating terminal 20 under the ISP network 12 environment to the general terminal 26 under the carrier network 24 environment, the receiving general terminal will receive the incoming call charge service. Is determined based on the charging information stored in the IP telephone switching device 14, and according to the determination result, a parameter added to the incoming response message to the CPE 16 is set. Billing management can be controlled.

  In this embodiment, the IP telephone exchange device 14 is information indicating whether or not the general terminal 26 in the environment of the carrier network 24 provides the incoming billing service, that is, the call connection when the general terminal 26 is the receiving side. You may have storage parts (not shown), such as a table and a list | wrist which store beforehand the charging information which shows whether it is caller charge or caller non-charge. This storage unit may store charging information in association with identification information of the general terminal 26, for example, a telephone number.

  The IP telephone exchange 14 receives a call connection request from the calling PBX accommodating terminal 20 via the PBX 18 and CPE 16, and receives an incoming call response notification corresponding to the call connection request from the called general terminal. By detecting the identification information of the called general terminal included in the call connection request or the incoming call response notification from the storage unit, it can be determined whether or not the call connection is charged for incoming calls.

  The IP telephone switching device 14 sets a parameter according to the determination result, and connects the incoming call response message 108 for notifying that the called party has answered with the PBX 18 that accommodates the calling PBX accommodating terminal 20. Send to. For example, if the identification information of the called general terminal 26 is stored in the storage unit as a result of this determination, the incoming response message 108 is inverted / non-inverted according to the charging information associated with the identification information in the storage unit. If not stored, the incoming call response message 108 is transmitted by normal operation. Further, when the charging information associated with the identification information is non-charging, the IP telephone exchange device 14 sets the reverse instruction parameter of the incoming response message 108 to the non-inverted instruction, and when the charging information is charging, the reverse instruction Set the parameter to reverse.

  The CPE 16 receives the incoming response message 108 and transmits the response signal 110 to the PBX 18 with the polarity of the voltage signal inverted or non-inverted according to the inversion instruction parameter.

  The PBX 18 detects whether the polarity of the voltage signal of the response signal 110 from the CPE 16 is inverted, determines whether this call connection is caller charged or caller uncharged, It is possible to control the charging management of the subscriber for the calling PBX accommodating terminal.

  In addition, the IP telephone switching device 14 is limited to a call connection in which a predetermined general terminal 26 in the environment of the carrier network 24 is the receiving side and the predetermined PBX accommodating terminal 20 in the environment of the ISP network 12 is the calling side. When permitting the provision of the incoming billing service, the identification information of the predetermined general terminal 26 and the predetermined PBX accommodating terminal 20 is respectively set as incoming terminal information and outgoing terminal information, and these are stored in advance in the storage unit as one combination information. Accounting information associated with this combination information can also be stored.

  As a result, the IP telephone exchange device 14 can make a call connection request from the calling PBX accommodating terminal 20 or an incoming call response notification from the called general terminal 26 in response to this call connection request. It is possible to detect whether or not the combination of the identification information of the called general terminal 26 is stored in the storage unit. If this combination is stored as a result of this detection, the call connection determines whether the call connection is not charged or not charged based on the charging information associated with the combination information. The reverse instruction parameter in the incoming call response message 108 can be set.

  As another embodiment, the VoIP telephone switching system 10 includes a function for determining based on the charging information included in the incoming response notification from the general terminal 26 in the IP telephone switching apparatus 14, and the charging information stored in the storage unit And a function to make a determination based on. Here, when there is a call connection to be sent from the PBX accommodating terminal 20 in the ISP network 12 environment to the general terminal 26 in the carrier network 24 environment, it is detected that the caller is not charged in any of these determinations Then, the inversion instruction parameter in the incoming response message 108 to the CPE 16 can be set to the non-inversion instruction.

  In the VoIP telephone switching system 10 of the present invention, it is possible to cope with billing management without caller billing simply by adding and setting a unique inversion instruction parameter to the incoming response message 108 from the IP telephone switching apparatus 14 to the CPE 16. Therefore, the IP telephone switching device 14 implements a block that adds a reverse instruction parameter to the incoming call response message 108 and a block that determines the reverse instruction parameter of the incoming call response message 108 in the CPE 16 by configuring the program, etc. can do.

  Furthermore, according to the present invention, for the existing IP telephone exchange device 14 and CPE 16, call control is performed so that the incoming response message 108 from the IP telephone exchange device 14 to the CPE 16 corresponds to the reverse instruction parameter. The billing control of the present invention can be handled only by changing the software.

It is a block diagram which shows one Example of the VoIP telephone switching system of this invention. 2 is a sequence chart for explaining an operation procedure of the VoIP telephone switching system shown in FIG. 3 is a flowchart for explaining an operation procedure of the VoIP telephone exchange system shown in FIG.

Explanation of symbols

10 VoIP telephone switching system
12 ISP network
14 IP telephone switching equipment
16 CPE
18 PBX
20 PBX terminal
22 GW
24 carrier network
26 General terminal

Claims (28)

Including an IP telephone exchange device and one or more subscriber premises devices arranged in a network environment using the Internet Protocol (IP),
The IP telephone exchange device performs call control by connecting to the subscriber premises device via the network,
The subscriber premises equipment is connected to a private branch exchange accommodating one or more PBX accommodating terminals, and performs IP telephone control signal processing,
The private branch exchange has a charge management function for the PBX-accommodating terminal, detects the polarity of the voltage level of the incoming response signal supplied from the subscriber premises equipment, and detects the inversion of the polarity. In a VoIP telephone switching system in which charging is controlled and charging is controlled as caller non-charging when it is not detected, the system transmits a call connection request from the PBX accommodating terminal, and the called party terminal receives an incoming call in response to the request. When the response is notified, the incoming call response notification is transmitted to the IP telephone exchange device,
The IP telephone exchange apparatus determines whether the call connection is caller charged or caller uncharged when an incoming call response message corresponding to the incoming call response notification is transmitted to the subscriber premises apparatus. And, based on the determination result, parameter addition means for adding a reversal instruction parameter for instructing reversal of the polarity of the voltage level of the incoming response signal to the incoming response message only when the call connection is caller charging. Including
When the subscriber premises device transmits an incoming call response signal to the private branch exchange in response to the incoming call response message, the subscriber premises device has a voltage level polarity of the incoming call response signal in accordance with the inversion instruction parameter in the incoming call response message. A VoIP telephone switching system comprising polarity reversal control means for controlling reversal. The VoIP telephone switching system according to claim 1, wherein the system includes a gateway disposed in the environment of the network and having a media switching function between the network and another carrier network,
The PBX-accommodating terminal sends a call connection request to the called party terminal in the carrier network environment, the called party terminal responds to the incoming call, and the call connection is charged by the caller or sent via the carrier network. When the incoming call response notification with the charging information indicating whether the user is not charged is sent to the gateway,
The gateway sends the incoming call response notification to the IP telephone exchange device,
The VoIP telephone switching system, wherein the parameter adding means determines whether the call connection is caller charge or caller non-charge according to charging information added to the incoming call response notification.   3. The VoIP telephone switching system according to claim 2, wherein the carrier network is a public switched telephone network.   4. The VoIP telephone switching system according to claim 3, wherein the gateway receives the incoming call response notification from the public switched telephone network using a No. 7 common line signaling method, and transmits the notification to the IP telephone switching apparatus. A featured VoIP telephone switching system.   5. The VoIP telephone switching system according to claim 1, wherein the parameter addition means and the polarity inversion control means are configured by software. The VoIP telephone switching system according to any one of claims 1 to 5, wherein the system identifies the PBX-accommodating terminal and a general terminal in the carrier network environment using identification information,
The IP telephone exchange apparatus is configured to identify billing information indicating whether the call connection when the general terminal is the called party terminal on the receiving side is caller billing or caller non-billing. Storage means for storing information in association with the information;
When the PBX-accommodating terminal sends a call connection request to the called party terminal, the called party terminal responds to the incoming call and sends an incoming call response notification to the IP telephone exchange device.
The parameter adding means detects whether or not the identification information of the called party terminal added to the request or the incoming call response notification is stored in the storage means, and when the storage is detected, A VoIP telephone switching system characterized by determining whether the call connection is a caller charging or a caller non-charging according to charging information corresponding to identification information. 7. The VoIP telephone switching system according to claim 6, wherein the storage means is configured to receive a call charging service only for a call connection in which the predetermined general terminal is a caller having the caller as a caller and the PBX accommodating terminal as a caller. When the provision is permitted, the identification information of the predetermined general terminal and the predetermined PBX-accommodating terminal is set as receiving terminal information and transmitting terminal information, respectively, which are combined information, and the charging information corresponds to the combined information. Store with
The parameter adding means detects the identification information of the called party terminal on the called side and the identification information of the PBX accommodating terminal on the calling side added to the request or the incoming call response notification, It is detected whether it is stored in the storage means, and when the storage is detected, it is determined whether the call connection is caller charging or caller non-charging according to the charging information corresponding to the combination VoIP telephone switching system characterized by that.   8. The VoIP telephone switching system according to claim 6, wherein the identification information is a telephone number.   9. The VoIP telephone switching system according to claim 6, wherein the storage means is a table.   10. The VoIP telephone switching system according to claim 6, wherein the storage means is configured by software.   11. The VoIP telephone switching system according to claim 1, wherein a media gateway control protocol (MGCP) is used as a VoIP signaling protocol.   11. The VoIP telephone switching system according to claim 1, wherein a protocol conforming to H.248 / MEGACO (Media Gateway Control) is used as a VoIP signaling protocol.   11. The VoIP telephone switching system according to claim 1, wherein a protocol conforming to H.323 is used as a VoIP signaling protocol.   11. The VoIP telephone switching system according to claim 1, wherein a Session Initiation Protocol (SIP) is used as a VoIP signaling protocol. In a VoIP telephone switching system in which an IP telephone switching device and one or more subscriber premises devices are placed in a network environment using the Internet Protocol (IP),
In the IP telephone exchange device, the call control is executed by connecting to the subscriber premises device via the network,
In the subscriber premises equipment, IP telephone control signal processing is performed by connecting to a private branch exchange accommodating one or more PBX accommodating terminals,
In the private branch exchange, charge management of the PBX-accommodating terminal is performed, and the polarity of the voltage level of the incoming response signal supplied from the subscriber premises equipment is detected. In the charging control method of performing charging control as caller non-charging when it is not detected, the method is such that the PBX accommodating terminal transmits a call connection request, and the called party terminal receives and responds in response to the request. , The incoming call response notification is sent to the IP telephone exchange device,
When the IP telephone exchange device transmits an incoming call response message corresponding to the incoming call response notification to the subscriber premises device, it determines whether the call connection is caller charged or caller uncharged A parameter addition step of adding a reverse instruction parameter for instructing the reversal of the polarity of the voltage level of the incoming call response signal to the incoming call response message only when the call connection is a caller billing based on the determination result. Including
When the subscriber premises equipment transmits an incoming response signal to the private branch exchange in response to the incoming response message, the voltage level polarity of the incoming response signal is determined in accordance with the inversion instruction parameter in the incoming response message. A charging control method comprising a polarity inversion control step for controlling inversion. 16. The charging control method according to claim 15, wherein the method arranges a gateway having a media exchange function between the network and another carrier network in the environment of the network in the VoIP telephone switching system,
The PBX-accommodating terminal sends a call connection request to the called party terminal in the carrier network environment, the called party terminal responds to the incoming call, and the call connection is charged by the caller or sent via the carrier network. When sending an incoming response notification with charging information indicating whether the user is not charged to the gateway,
The gateway sends the incoming call response notification to the IP telephone exchange device,
The charging control method characterized in that the parameter adding step determines whether the call connection is caller charging or caller non-charging according to charging information added to the incoming call response notification.   17. The charging control method according to claim 16, wherein the carrier network is a public switched telephone network.   18. The charging control method according to claim 17, wherein the gateway receives the incoming call response notification from the public switched telephone network using No. 7 common line signaling at the gateway and transmits it to the IP telephone switching apparatus. And a charging control method.   19. The charging control method according to claim 15, wherein the parameter addition step and the polarity inversion control step are configured by software. The charging control method according to any one of claims 15 to 19, wherein the method identifies the PBX-accommodating terminal and a general terminal in the carrier network environment using identification information,
In the IP telephone exchange device, charging information indicating whether the call connection when the general terminal is the called party terminal on the called side is caller charging or caller non-charging is identified by the general terminal identification Including a storing step of storing in association with information,
When the PBX accommodating terminal sends a call connection request to the called party terminal, the called party terminal responds to the incoming call and sends an incoming call response notification to the IP telephone exchange device.
The parameter adding step detects whether the identification information of the called party terminal added to the request or the incoming call response notification is stored in the storing step, and when the storage is detected, the identification information A charging control method characterized by determining whether the call connection is caller charging or caller non-charging according to charging information corresponding to the information. 21. The charging control method according to claim 20, wherein the storing step provides an incoming charging service only for a call connection in which the predetermined general terminal is a caller having itself as a callee and the predetermined PBX accommodating terminal is a caller. Is permitted, the identification information of the predetermined general terminal and the predetermined PBX-accommodating terminal is set as receiving terminal information and transmitting terminal information, respectively, and the charging information is associated with the combination information as one combination information. Store
The parameter adding step detects the identification information of the called party terminal on the called side and the identification information of the PBX accommodating terminal on the calling side added to the request or the incoming call response notification, and a combination thereof detects the identification information It is detected whether or not it is stored in the storing step, and when the storage is detected, it is determined whether the call connection is caller charging or caller non-charging according to the charging information corresponding to the combination A charging control method characterized by the above.   22. The charging control method according to claim 20, wherein the identification information is a telephone number.   23. The charging control method according to claim 20, wherein the storing step stores identification information in a table.   24. The charging control method according to claim 20, wherein the storing step is configured by software.   25. The charging control method according to claim 15, wherein the method uses a media gateway control protocol (MGCP) as a VoIP signaling protocol.   25. The charging control method according to claim 15, wherein the method uses a protocol compliant with H.248 / MEGACO (Media Gateway Control) as a VoIP signaling protocol.   25. The charging control method according to claim 15, wherein the method uses a protocol based on H.323 as a VoIP signaling protocol. 25. The charging control method according to claim 15, wherein the method uses a Session Initiation Protocol (SIP) as a VoIP signaling protocol.

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