JP4657866B2 - Communication system and communication method - Google Patents

Description

  The present invention relates to a communication system and a communication method, and more particularly to a virtual internal / external network communication system and a virtual internal / external network communication method using a communication carrier IP telephone service.

  In recent years, each communication carrier has offered an IP phone service that guarantees voice quality and service quality equivalent to those of conventional general subscriber telephones (landline telephones), and calls between the same services or partner services are free of charge. Yes.

  A first conventional example of IP telephone service will be described with reference to FIG. As shown in FIG. 17, when a call is made from the IP telephone 12a (extension number: 1000) to the external number 06-9999-9999, the call information is transmitted to the SIP call control device (Session Initiation Protocol) 18a (step S11).

  The SIP call control device 18a searches the destination conversion information DB 19a and determines a gateway (G / W) through which it passes (step S12). Here, the gateway 11a (external line number: 03-5555-5555) is assumed to be routed.

  The SIP call control device 18a instructs the gateway 11a to make a call to the customer telephone (06-9999-9999) (step S13).

  The gateway 11a arrives at the customer telephone 41 (06-9999-9999) via the public network (step S14).

  The customer's telephone 41 displays the center side gateway external line number (03-5555-5555) (step S15).

  When the customer raises the handset of the customer telephone 41, a call is established between the IP telephone 12a and the customer telephone 41, and the call is started. As described above, the caller number notified to the customer telephone 41 is the outside line number of the center gateway 11a (see, for example, Patent Document 1).

  A second conventional example of IP telephone service will be described with reference to FIG. As shown in FIG. 18, when the customer telephone 41 (telephone number 06-9999-9999) is connected to an external telephone number 06-7777-8888 of the PSTN (public switched telephone network) network gateway 31 of the sales office, the PSTN network gateway 31 Call information (caller number, incoming call number) that arrives at is transmitted to the call control device 18b of the sales office (step S21).

  The call control device 18b of the branch office searches the destination conversion information DB using the incoming telephone number 06-7777-8888 as a key, and determines and calls the extension number 2000 associated with the incoming telephone number 06-7777-8888 ( Step S22).

When the handset of the IP telephone 12b assigned with the extension number 2000 is raised, a call is established between the IP telephone 12b and the customer telephone 41, and the call is started.
JP 2005-1224086 A

  In the prior art, the outside line number of the carrier network gateway 11a on the center side that is the transmission source is notified to the customer telephone 41 as the transmission source and displayed. When the actual caller is a center, it is not possible to notify and display the customer telephone 41 with an outside line number other than the center (for example, an outside line number of a sales office) as the caller. Further, according to the conventional technique, when a call is made from the customer telephone 41 to an outside line number of a sales office (for example, 06-7777-8888), the incoming call cannot be made to the IP telephone 12a in the center.

  One of the objects of the present invention is that in a telephone system utilizing high-quality IP telephone service and in-house SIP technology, when the actual caller is a center, an outside line number other than the center (for example, an outside line of a sales office) No.) is notified and displayed on the customer's telephone 41 as a caller.

  Another object of the present invention is to make a call from a customer telephone 41 to an outside line number of a sales office (for example, 06-7777-8888) in a telephone system utilizing high-quality IP telephone service and in-house SIP technology. In this case, the IP telephone 12a in the center is allowed to receive a call.

  According to a first aspect of the present invention, there is provided a communication system comprising: destination conversion information storage means for storing a center side extension number and a carrier network center side number in association with each other; and a CTI (Computer Telephony Integration) server. The carrier network base side number is received, the carrier network center side number stored in association with the center side extension number is read from the destination conversion information storage means, and the carrier network center side number is assigned. Center side call control means for instructing the carrier network center side repeater to send a call from the IP telephone assigned the center side extension number to the carrier network base side number, and the center side extension number And store the carrier network center side number, the carrier network base side number, and the customer telephone number in association with each other Receiving the carrier network center side number and the carrier network base side number from the carrier network base side repeater to which the carrier network base side number is assigned, and from the call information storage means, The base side call that reads out the customer telephone number stored in association with the carrier network center side number and issues an instruction to the public network repeater to transfer the call from the public network source number to the customer telephone number And a control means. The carrier network includes a circuit network provided by a communication carrier such as NTT (registered trademark).

  According to a second aspect of the present invention, there is provided a communication system, wherein destination conversion information storage means for storing a customer telephone number and a carrier network center side number in association with each other; A correspondence number stored in association with the customer telephone number is read from the destination conversion information storage means, and if the correspondence classification is center correspondence, the customer information is further read from the destination conversion information storage means. A base that reads out the carrier network center side number stored in association with a telephone number and instructs the carrier network base side repeater to transfer a call from the carrier network base side number to the non-public center side number Side call control means, call information storage means for associating and storing the carrier network base side number, the carrier network center side number, and the customer telephone number The carrier network center side number and the carrier network center side number are received from the carrier network center side repeater to which the carrier network center side number is assigned, and the carrier network base side number is received from the call information storage means. Read the customer phone number stored in association, send the customer phone number to the CTI server, receive the center side extension number from the CTI server, and send the center side IP phone assigned the center side extension number to the center side IP phone Center-side call control means for transferring a call, and upon receiving the customer telephone number, the CTI server sends the customer telephone number to a client corresponding to the center-side IP telephone.

  The third feature of the present invention is a communication system, which is established between a center side extension telephone and a customer telephone via a carrier network center side repeater, a carrier network base side repeater, and a public network repeater. And the second call is placed between the center side extension telephone and the base side extension telephone via the carrier network center side repeater and the carrier network base side repeater. After the establishment, the center side client capable of outputting a transfer notification from the center side extension telephone to the base side extension telephone, and receiving the transfer notification, outputs instructions for disconnecting the first and second calls. And a CTI server for instructing waiting for transfer to the base-side extension telephone, and call information for waiting for transfer as to the status relating to the first call upon receiving the transfer waiting instruction. A storage unit; a center-side call control device that instructs the center-side extension telephone and the center-side carrier network repeater to disconnect the first and second calls upon receiving the disconnection instruction; When receiving the disconnection instruction for the second call, the center-side carrier network repeater that issues a disconnection signal for the first and second calls, and the first and the second via the base-side carrier network repeater When a disconnection signal is received for the second call, the call information storage means is searched using the telephone number to be disconnected as a key, and if the status associated with the telephone number to be disconnected is waiting for transfer, the call is disconnected. The call is forwarded to the local extension telephone number associated with the target telephone number and a disconnect signal is returned, while the telephone number associated with the telephone number to be disconnected is returned. If Tasu is not awaiting transfer is to and a said base-side call control device that returns a disconnect signal without transferring the call.

  According to the first feature of the present invention, a customer telephone is set up from an IP telephone set such as a centralized transmission / reception business center side via a center side carrier network repeater, a branch office side carrier network repeater, and a branch office side public network repeater. Can receive calls. Communication costs can be reduced because the carrier network is used from the centralized transmission / reception business center to the sales office close to the customer. In addition, since the customer phone receives a call from the outside line of the sales office, even if the operator makes a call from the centralized call transmission / reception business center, the outside telephone number of the sales office is used as the calling telephone number. Be notified.

  According to the second aspect of the present invention, when a customer calls a sales office from a customer's telephone, the center side passes through the public network relay, the sales office carrier network relay, and the center carrier network relay. A call can be received at an extension telephone. The carrier network is used from the sales office close to the customer to the centralized transmission / reception business center, so communication costs can be reduced. In addition, a call from the customer to the branch number outside the branch can be transferred to the centralized call transmission / reception business center without being known by the customer.

  According to the third feature of the present invention, it is established between the customer telephone and the center extension telephone via the public network repeater, the branch office carrier network repeater, and the center carrier network repeater. The telephone call can be transferred from the center side extension telephone to the branch office extension telephone, and two communication paths are established between the branch office carrier network repeater and the center carrier network repeater (so-called It is also possible to avoid a ping-pong state.

  The best mode for carrying out the present invention will be described below with reference to the drawings. The following description is merely an example, and the technical scope of the present invention is not limited by the following description.

  FIG. 1 is a diagram showing an overall configuration of a virtual internal / external network system according to an embodiment of the present invention. As shown in FIG. 1, on the line side, a carrier service network 2 having a caller ID notification service and carrier network gateways (G / W) 11a, b having an interface with the carrier service network 2 are connected to customers. A PSTN network gateway 31 having an interface with the public line 3, the mobile network 4, and the public line 3. The terminal side includes a PBX gateway 14 having an interface with the IP telephones 12a and 12b and a PBX (private branch exchange) 13, an analog telephone (not shown) accommodated in the PBX 13, and a personal computer terminal 15 for outgoing / incoming business. A CTI server 160 and a customer DB 161 for linking the personal computer terminal 15 and the SIP telephone system are provided. The SIP telephone system includes SIP call control devices 180a and 180b, destination conversion DBs 181a and b and external line numbers DB 183a and b set in the SIP call control devices 180a and 180b, a call information DB 190 for managing SIP call information, and their It consists of a LAN facility for connecting devices with the IP protocol and a data WAN 5 for connecting to remote devices.

  FIG. 2 shows the contents of the customer table stored in the customer DB, the relay gateway determination table stored in the destination conversion information DB, and the external line number table stored in the external line number DB.

  As shown in FIG. 2, the customer table T1 stores an external number of a customer (for example, 06-9999-9999) and an external number of a carrier network gateway (for example, 06-7777-7777) in association with each other. . As shown in the table T2a, the relay gateway determination table associates the extension number of the transmission source (for example, 1000), the external line number of the relay destination (for example, 03-5555-5555), and the name of the relay gateway (for example, Gateway11a). As shown in Table T2b, the transfer source external number (for example, 06-7777-8888), the relay destination external number (for example, 06-7777-7777), and the transfer destination external number (for example, 03-5555-5555) are stored in association with each other. The outside line number table T3 stores a destination outside line number (for example, 03-5555-5555).

  FIG. 3 shows the contents of the call information table stored in the call information DB. The call information table T11 is a call information table according to the first embodiment, the call information table T21 is a second embodiment, and the call information table T31 is a call information table according to the third embodiment.

  As shown in FIG. 3, the call information tables T11 to T13 include a call ID (for example, 20050610001), a status (for example, Ready: preparing for a call), and an external line number of a source network gateway (for example, 03-5555-5555). ), An external number of the destination network gateway (for example, 06-7777-7777), an extension number as the source telephone ID (for example, 100-1000), and an extension number as the destination telephone ID (for example, 100-1000) The extension number (for example, 200-2000) as the forwarding destination telephone ID, the external number of the PSTN network gateway (for example, 06-7777-8888), the destination customer external number (for example, 06-9999-9999), and the source The customer external number (for example, 06-9999-9999) is stored in association with each other. The status types are “Ready: Preparing for Call”, “Outbound: Calling”, “Completed: Completed”, “Trans-Req: Transfer Request”, “Busy: Calling the other party”, “Canceled: Call control cancellation ”is included.

[First embodiment]
FIG. 4 is a flowchart showing the flow of processing on the center side according to the first embodiment. FIG. 5 is a flowchart showing a flow of processing on the sales office side according to the first embodiment. 6-7 is a figure which shows the flow of a process by the center side and sales office side which concern on 1st Embodiment with the information transmitted / received between each apparatus.

  Based on FIGS. 4-7, a series of flow from transmission to the start of a telephone call is demonstrated. First, the business personal computer terminal 15 instructs the CTI server 160 to make a call to the customer telephone 41 (external number 06-9999-9999). The external line number of the carrier network gateway 11b to be routed may be determined by searching the customer DB 161 based on the external line numbers 06-9999-9999, or may be input by the terminal operator (step S101).

  Upon receiving the instruction, the CTI server 160 calls the center side call control device 180a from the IP telephone 12a (extension number 1000) to the outside number 06-7777-7777 of the branch office carrier network gateway 11b. An instruction is issued (step S103).

  The call control device 180a searches the relay gateway determination table T2a stored in the destination conversion information DB 181a to determine a gateway through which it passes. In this embodiment, it is assumed that the route goes through 03-5555-5555 (step S105).

  The call control device 180a writes the call information to the call information DB 190 as shown in L11 of the call information table T11, and assigns Ready as call status: Ready (step S107).

  The call control device 180a instructs the carrier network gateway 11a to make a call to 06-7777-7777 (step S109).

  The call control device 180a changes the status of the call information DB 190 to “Outbound”: OutBound, as indicated by L12 in the call information table T11 (step S111).

  The incoming call is received from the carrier network gateway 11a via the carrier service network 2 to the carrier network gateway 11b (06-7777-7777) (step S113).

  Call information (caller number, incoming call number) is transmitted from the carrier network gateway 11b to the call control device 180b of the sales office (step S115).

  The branch office call control device 180b searches the external line number table T3a stored in the external line number DB 183b using the call information (destination number) as a key. If the corresponding number exists, the call information table T11 stored in the call information DB 190 is searched using the call information (caller number) as a key. Then, it is confirmed that the call is from the extension telephone (100-1000) to the customer 06-9999-9999 (step S117).

  The call control device 180b of the branch office issues an instruction to transfer the call to the customer telephone via the PSTN network gateway 31 (06-7777-8888) (step S119).

  The PSTN network gateway 31 sends a call to the customer telephone number via the public line network 3 or the mobile network 4 and then arrives at the customer telephone. At this time, the store telephone number (06-7777-8888) is displayed on the customer telephone (step S121).

  The call control device 180b of the sales office changes the status of the call information table to “completed” as shown in L13 of the call information table T11 (step S123). In this way, a call is established between the telephone 12a (extension number: 1000) and the customer's landline or mobile phone, and the call is started.

  As described above, according to the first embodiment, a call is received from a centralized call transmission / reception business center (so-called call center) via a center carrier network gateway, a branch carrier network gateway, and a PSTN network gateway. be able to. Since the carrier network is used up to the sales office close to the customer, the communication cost can be reduced. Further, since the customer telephone is received as a call from the outside line of the branch office, it is not necessary to know that the operator has sent the call from the centralized call transmission / reception business center. For this reason, it is possible to centralize reception and transmission work.

[Second Embodiment]
FIG. 8 is a flowchart showing a flow of processing on the center side according to the second embodiment. FIG. 9 is a flowchart showing a flow of processing on the branch office side according to the second embodiment. FIGS. 10-11 is a figure which shows the flow of the process by the center side and sales office side which concern on 2nd Embodiment with the information transmitted / received between each apparatus.

  Based on FIGS. 8 to 11, a series of flow from outgoing call to start of call will be described. First, when calling from the customer telephone 41 (external number 06-9999-9999) to the sales office telephone number 06-7777-8888, call information (caller ID, incoming call number) received at the PSTN network gateway 31 is stored in the sales office. The message is transmitted to the call control device 180b (step S201).

  The store call control device 180b searches the customer table T1 stored in the customer DB 161 using the call information (caller number) as a key. When the customer classification of the customer table T1 is center-compatible, the following center transfer process is entered (step S203). In the case of dealing with a sales office, a call is received by a telephone in the sales office.

  When the customer classification of the customer table T1 is center-compatible, the branch office call control device 180b searches the relay gateway determination table T2b stored in the destination conversion information DB 181b, and the branch office carrier network gateway 11b (external line number) 06-7777-7777) and the carrier network gateway 11a (external line number 03-5555-5555) on the center side that is the transfer destination is determined (step S205).

  The call control device 180b of the sales office writes the call information to L21 of the call information table T21 of the call information DB 190, and assigns Ready as call status: Ready (step S207).

  The store-side call control device 180b instructs the store-side carrier network gateway 11b to make a call to the center-side carrier network gateway 11a (external number 03-5555-5555) (step S209).

  As shown in L22 of the call information table T21, the branch office side call control device 180b changes the status to “Calling: OutBound” (step S211).

  A call is received from the branch office carrier network gateway 11b (external line number 06-7777-7777) to the center side carrier network gateway 11a (external line number 03-5555-5555) via the carrier network (step S213).

  Call information (caller number, incoming call number) is transmitted from the center side carrier network gateway 11a to the center side call control device 180a (step S215).

  The center side call control device 180a searches the outside line number table T3b using the call information (destination number) as a key. If the corresponding number exists, the call information DB is searched using the call information (caller number) as a key, and the customer phone 41 (06-9999-9999) to the center via the branch carrier network gateway 11b (06-7777-7777) It is confirmed that the call is addressed (step S217).

  The center side call control device 180a makes a call request for an appropriate operator's IP telephone to the CTI server 160 (step S219).

  The CTI server 160 makes a call request for an appropriate IP telephone 12a (extension number 1000) to the center-side call control device 180a, and the call control device 180a calls the corresponding extension. At the same time, the CTI server 160 sends the call information to the corresponding operator's terminal. Is transmitted (step S221).

  As shown in L23 of the call information table T21, the center side call control device 180a changes the status of the call information DB to call control complete: completed (step S223). In this way, a call is established between the IP telephone 12a (extension number 1000) and the customer telephone 41, and the call is started.

  As described above, according to the second embodiment, a call is received from a customer telephone to a centralized call transmission / reception business center (so-called call center) via a PSTN network gateway, a branch office carrier network gateway, and a center carrier network gateway. be able to. Since the business network close to the customer uses the carrier network, the communication cost can be reduced. Further, the customer telephone only sends a call to the outside line number of the branch office, and it is not necessary for the customer to know that the call has been transferred to the centralized call transmission / reception business center. For this reason, it is possible to centralize reception and transmission work.

[Third embodiment]
[Prerequisite technology]
FIG. 12 is a diagram for explaining the prerequisite technology of the third embodiment, and shows the flow of processing on the center side and the branch office side. Based on FIG. 12, a technique that is a premise of the third embodiment will be described.

  Via the PSTN network gateway 31 (external number 06-7777-8888) of the sales store, the carrier network gateway 11b (external number 06-7777-7777) of the sales store, and the center side carrier network gateway 11a (external number 03-5555-5555) Thus, a call is established between the customer telephone 41 (phone number 06-9999-9999) and the center side IP telephone 12a (extension number 1000).

  A transfer request from the IP telephone 12a (extension number 1000) to the IP telephone 12b (extension number 2000) is made to the call control device 18a (step S31).

  The center-side call control device 18a searches the destination conversion information DB 19a, acquires the outside line numbers 06-7777-7777 of the branch office carrier network gateway 11b associated with the extension number 2000, and the center side as the relay gateway outside line number. The external number 03-5555-5555 of the carrier network gateway 11a is acquired, and the extension number 2000, the external number 06-7777-7777, the external number 03-5555-5555, and the extension number 1000 are associated with each other and stored in the call information DB 20. The status “Preparing for calling: Ready” is assigned. Further, the center side call control device 18a instructs the center side carrier network gateway 11a to make a call to the branch office carrier network gateway 11b. Furthermore, the center-side call control device 18a changes the status of the call information DB 20 to “calling: Outbound” (step S32).

  The center side carrier network gateway 11a arrives at the branch office carrier network gateway 11b via the carrier service network (step S33).

  Call information (caller number, destination number) is transmitted from the branch office carrier network gateway 11b to the branch office call control device 18b (step S34).

  The call control device 18b searches the call information DB 20 using the call information (caller number, destination number) as a key, and transfers it from the IP telephone 12a (extension number: 1000) to the IP telephone 12b (extension number: 2000). Make sure. Then, the SIP call control device 18b causes the IP telephone 12b to receive the call. Further, the SIP call control device 18b changes the status of the call information DB 20 to “call control complete: completed” (step S35).

  When the transfer from the IP telephone 12a to the IP telephone 12b is performed in this way, a call between the IP telephone 12b (extension number 2000) at the branch office and the customer telephone 41 is established (step S36).

  However, two communication paths are established between the carrier network gateway 11b and the center side carrier network gateway 11a of the branch office, and a so-called ping-pong state is established (step S37). The processing from step S31 to step S36 described above is hereinafter referred to as virtual extension transfer processing.

[Third embodiment-contents]
FIG. 13 is a flowchart showing a flow of a series of processes according to the third embodiment. FIG. 14 is a diagram illustrating a flow of a series of processes according to the third embodiment, together with information transmitted and received between devices. FIGS. 15-16 is a figure which shows the flow of a process by the center side and sales office side which concern on 3rd Embodiment with the information transmitted / received between each apparatus.

  Based on FIGS. 13 to 16, a series of flow from outgoing call to start of call will be described. First, a call is made from the customer telephone 41 (external line number 06-9999-9999), and via the branch office PSTN network gateway 31 (external line number 06-7777-8888) and the branch office carrier network gateway 11b (external number 06-7777-7777). Thus, a call is established between the customer telephone 41 and the center IP telephone 12a (extension number 1000).

  In the call information DB 190, the call ID 2005061500002, the center side gateway outside line number 03-5555-5555, and the branch office side outside line number 06-7777-7777 are associated and stored in the call information DB 190, and the status is “completed”. "Completed" is given.

  The business personal computer terminal 15 makes a transfer request to the branch office extension number 200-2000 to the CTI server 160. At that time, the call ID of the established call is added (step S301).

  The CTI server 160 searches the call information DB 190 using the call ID as a key, sets the transfer destination extension number 200-2000 in the corresponding data, and changes the status to Trans-Req indicating “transfer request” (step S303).

  The CTI server 160 makes a transfer request from the extension number 100-1000 to the extension number 200-2000 to the center side call control device 180a (step S305).

  Based on the above-described virtual extension transfer process, a call is established between the extension numbers 100-1000 and 200-2000, and new call information data is created at that time (step S307).

  After the business hand-over conversation is made between the extension numbers 100-1000 and 200-2000, the terminal 15 issues a transfer completion instruction to the CTI server. The CTI server issues a disconnection request for the extension number 100-1000 to the center side call control device, and issues a transfer waiting request to the extension number 200-2000 to the branch office side call control device (step S309).

  The center side call control device 180a disconnects the extension number 100-1000, and the 03-5555-5555 and 03-5555-5556 disconnection signals are issued to the carrier via the center side carrier network gateway 11a. The branch office side call control device 180b receives disconnection signals of 06-7777-7777 and 06-7777-7778 from the carrier via the gateway 11b (step S311).

  Receiving the disconnection signal, the branch office side call control device 180b refers to the external line number table T3b, and if the received telephone number to be disconnected exists in the table, the corresponding telephone number + status “transfer requested” is used as a key. The call information table T31 is searched (step S313).

  When the corresponding data exists, the branch office call control device acquires the transfer destination extension number, transfers the corresponding call to the corresponding extension number, and returns a disconnection signal to the carrier (step S315). The disconnection target telephone numbers 06-7777-7777 exist in the outside line number table T3b. Further, as indicated by L32 in the call information table T31, the disconnection target telephone number 06-7777-7777 + status “Transfer requested” (Trans-Req) exists in the call information table T31. Therefore, the call control device 180b acquires the transfer destination extension number 200-2000, transfers the call to the IP telephone 12b to which the extension number 200-2000 is assigned, and relates to 06-6777-7777 for the carrier. Returns the disconnect signal.

  On the other hand, if the corresponding data does not exist in step S313, the branch office call control device performs a disconnection process on the corresponding call (step S317). The disconnection target telephone numbers 06-7777-7778 exist in the external line number table T3b, but the disconnection target telephone numbers 06-7777-7778 + status “transfer requested” do not exist in the call information table T31. Therefore, the call control device 180b returns a disconnection signal regarding 06-7777-7778 to the carrier.

  As described above, according to the third embodiment, it is established between the customer telephone 41 and the IP telephone 12a via the PSTN network gateway 31, the branch office carrier network gateway 11b, and the center carrier network gateway 11a. The telephone call can be transferred from the IP telephone 12a to the IP telephone 12b, and two communication paths are established between the branch office carrier network gateway 11b and the center carrier network gateway 11a (so-called It is also possible to avoid a ping-pong state.

It is a figure which shows the whole structure of the virtual internal / external line network system which concerns on embodiment of this invention. It is a figure which shows the contents of the customer table memorize | stored in customer DB, the relay gateway determination table memorize | stored in destination conversion information DB, and the outside line number table memorize | stored in outside line number DB. It is a figure which shows the content of the call information table memorize | stored in call information DB which concerns on embodiment of this invention. It is a flowchart which shows the flow of the process by the center side which concerns on 1st Embodiment. It is a flowchart which shows the flow of the process by the shop side which concerns on 1st Embodiment. It is a figure which shows the flow of the process by the center side and the sales office side which concern on 1st Embodiment with the information transmitted / received between each apparatus. It is a figure which shows the flow of the process by the center side and the sales office side which concern on 1st Embodiment with the information transmitted / received between each apparatus. It is a flowchart which shows the flow of the process by the center side which concerns on 2nd Embodiment. It is a flowchart which shows the flow of a process by the sales office side which concerns on 2nd Embodiment. It is a figure which shows the flow of the process by the center side which concerns on 2nd Embodiment, and a shop side with the information transmitted / received between each apparatus. It is a figure which shows the flow of the process by the center side which concerns on 2nd Embodiment, and a shop side with the information transmitted / received between each apparatus. It is a figure for demonstrating the premise technique which concerns on 3rd Embodiment, Comprising: It is a figure which shows the flow of a process by the center side and a shop side. It is a flowchart which shows the flow of a series of processes concerning 3rd Embodiment. It is a figure which shows the flow of a series of processes which concern on 3rd Embodiment with the information transmitted / received between each apparatus. It is a figure which shows the flow of a series of processes which concern on 3rd Embodiment with the information transmitted / received between each apparatus. It is a figure which shows the flow of a series of processes which concern on 3rd Embodiment with the information transmitted / received between each apparatus. It is a figure which shows the flow of a series of processes which concern on the 1st prior art example of IP telephone service with the information transmitted / received between each apparatus. It is a figure which shows the flow of a series of processes which concern on the 2nd prior art example of IP telephone service with the information transmitted / received between each apparatus.

Explanation of symbols

2 ... Carrier service network 3 ... Public line network 4 ... Mobile network 5 ... Data WAN
11 ... Carrier network gateway 12 ... IP telephone 13 ... Private branch exchange (PBX)
14 ... PBX gateway 15 ... PC terminal 160 ... CTI server 161 ... Customer DB
180 ... SIP call control device 181 ... Destination conversion information DB
183 ... External number DB
190 ... Call information DB

Claims (3)

Destination conversion information storage means for storing the center side extension number and the carrier network center side number in association with each other;
Receiving the center side extension number and carrier network base side number from the CTI server, reading out the carrier network center side number stored in association with the center side extension number from the destination conversion information storage means; Center side call control for instructing the carrier network center side repeater to which the center side number is assigned to issue a call from the IP telephone assigned to the center side extension number to the carrier network base side number Means,
Call information storage means for associating and storing the center side extension number, the carrier network center side number, the carrier network base side number, and a customer telephone number;
The carrier network center side number and the carrier network base side number are received from the carrier network base side repeater to which the carrier network base side number is assigned, and associated with the carrier network center side number from the call information storage means Base station call control means for reading out the stored customer telephone number and instructing the public network repeater to transfer the call from the public network source number to the customer telephone number. A communication system characterized by the above. The destination conversion information storage means stores the center side extension number and the carrier network center side number in association with each other,
The center side call control means receives the center side extension number and the carrier network base side number from the CTI server, and is stored in association with the center side extension number from the destination conversion information storage means. The number is read, and the call is transmitted from the IP telephone assigned the center side extension number to the carrier network base side number to the carrier network center side repeater assigned the carrier network center side number. Instruct
Call information storage means stores the center side extension number, the carrier network center side number, the carrier network base side number, and the customer telephone number in association with each other,
The base side call control means receives the carrier network center side number and the carrier network base side number from the carrier network base side repeater to which the carrier network base side number is assigned, and from the call information storage means, A communication method comprising: reading out the customer telephone number stored in association with a carrier network center side number and causing the public network repeater to transfer the call from the public network source number to the customer telephone number . The call information storage means further stores a call state in association with the extension number, the carrier network center side number, the carrier network base side number, and the customer telephone number;
The base side call control means reads the call state from the call information storage means, and determines whether or not to transfer the call to the customer telephone number based on the call state. The communication method according to claim 2.

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