JP2011182204A - Communication system and communication method in ip telephone network - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication system in an IP telephone network capable of providing a company-group telephone service in the IP telephone network. <P>SOLUTION: In the communication system in the IP telephone network 1, an IP conversion device 20 includes a dial receiving part 23 receiving a dial number outputted from a telephone terminal 10 decided as a subscriber to the company-group telephone service and an SIP editing part 24 editing the dial number and a peculiar number to the telephone terminal 10 to an SIP signal and transmitting the SIP signal to a subscriber server 30. In the communication system, the subscriber server 30 includes a call decision part 32 transmitting the SIP signal to an application server 40 when a call from the telephone terminal 10 subscribed to the company-group telephone service is decided. In the communication system, the application server 40 includes a connection control part 42 converting the SIP signal so as to contain the peculiar number to the telephone terminal 10 related to the dial number and transmitting the converted SIP signal to the IP conversion device 20 through the subscriber server 30. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a communication system and a communication method in an IP telephone network, and more particularly to a communication system and a communication method in an IP telephone network in which a business office collective telephone service is adopted.

The office collective telephone (CES) service allows users to connect to a plurality of telephone terminals by dialing an N-digit number called an extension number at a plurality of telephone terminals provided in one office. This is a service that enables In a telephone terminal adopting the CES service, a connection to a telephone terminal outside the CES service (external line call) is performed after dialing a “special number or symbol indicating external line transmission (hereinafter simply referred to as a special symbol)”. This is done by dialing the previous phone number.
In the conventional circuit switched telephone network (PSTN), all functions necessary for realizing CES services such as CES hooking control, CES dial reception, CES connection determination, and CES connection control are provided in the subscriber exchange. A single switch implements services such as outgoing calls from CES service subscriber telephone terminals and extension connections between CES service subscriber telephone terminals (see Non-Patent Document 1).

"IP Centrex" [on line] [searched on January 15, 2010], Internet <URL: http://itpro.nikkeibp.co.jp/free/NCC/denwa/20050211/10/>

  The CES service described above is a service provided by PSTN, and it is desired to provide a similar service in the IP telephone network.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a communication system and a communication method in an IP telephone network that can provide an office group telephone service in the IP telephone network. .

  In order to solve the above problems, the present invention provides a plurality of telephone terminals, an IP conversion apparatus communicatively connected to the plurality of telephone terminals, a subscriber server communicatively connected to the IP conversion apparatus, A communication system in an IP telephone network comprising an application server communicably connected to the subscriber server, wherein the IP conversion device determines whether or not the telephone terminal subscribes to a business establishment collective telephone service. When the service subscription storage unit stored and the off-hook signal transmitted from the originating telephone terminal in the plurality of telephone terminals are acquired, the originating telephone terminal refers to the service subscription storage unit and A hooking control unit that determines whether or not a group telephone service has been subscribed to, and a dialed number that is output from the calling telephone terminal that has been determined to be subscribed A dial receiving unit for receiving, a SIP editing unit for editing the dialed digits received by the dial receiving unit and a number unique to the calling telephone terminal into a SIP signal and transmitting the SIP signal to the subscriber server; The subscriber server includes a telephone terminal number storage unit that stores a number unique to the telephone terminal that is subscribed to the operator group telephone service, and is unique to the telephone terminal included in the SIP signal. The telephone terminal number storage unit is referred to based on the number of the telephone, and it is determined whether or not the call is from a telephone terminal that subscribes to the establishment group telephone service, and subscribes to the establishment group telephone service. A call determination unit that transmits the SIP signal to the application server when it is determined that the call is from a certain telephone terminal. A storage unit that stores the number associated with the number unique to the telephone terminal and the telephone associated with the dialed number by referring to the storage unit based on the dialed number included in the SIP signal A connection control unit that converts the SIP signal to include a terminal-specific number and transmits the converted SIP signal to the IP conversion device via the subscriber server, and the IP conversion device further includes: , Based on the converted SIP signal received from the subscriber server, a storage location extraction unit that extracts a storage location of a destination telephone terminal in the plurality of telephone terminals, and on the basis of the converted SIP signal, It is determined whether or not the called-side telephone terminal has been called using the establishment group telephone service, and is extracted when it is called using the establishment group telephone service. And a determining unit that calls the destination telephone terminal based on the received accommodation position.

  The present invention also provides an IP telephone network comprising a plurality of telephone terminals, an IP converter connected to be communicable with the plurality of telephone terminals, and a subscriber server connected to be communicable with the IP converter. The IP conversion apparatus includes a service subscription storage unit that stores whether or not the telephone terminal subscribes to a business office collective telephone service, and a telephone terminal on the calling side of the plurality of telephone terminals A hooking control unit that determines whether or not the calling telephone terminal subscribes to the establishment group telephone service with reference to the service subscription storage unit when an off-hook signal transmitted from A dial receiving unit that receives a dialed number output from the originating telephone terminal determined to be, and the dialed number received by the dial receiving unit; A SIP editing unit that edits the number unique to the calling telephone terminal into a SIP signal and transmits the SIP signal to the subscriber server, and the subscriber server subscribes to the operator group telephone service. A telephone terminal number storage unit for storing a number unique to the telephone terminal, and the telephone terminal number storage unit based on a number unique to the telephone terminal included in the SIP signal, and A call determination unit for determining whether the call is from a telephone terminal subscribing to a service; a storage unit for storing the dialed digits and a number unique to the telephone terminal in association with each other; When it is determined that the call is from a telephone terminal subscribing to a telephone service, the storage unit is referred to based on the dial digits included in the SIP signal and associated with the dial digits. A connection control unit that converts the SIP signal to include a number unique to the telephone terminal and transmits the converted SIP signal to the IP conversion device, and the IP conversion device further includes the subscriber server. A receiving position extracting unit that extracts a receiving position of the destination telephone terminal in the plurality of telephone terminals based on the converted SIP signal received from the telephone; and a destination telephone terminal based on the converted SIP signal Is called using the establishment group telephone service, and when called using the establishment group telephone service, based on the extracted location, the destination telephone terminal And a determination unit that calls

  When the hooking control unit acquires an off-hook signal transmitted from a telephone terminal other than the destination telephone terminal at the extracted accommodation location, the telephone terminal refers to the service subscription storage unit and the telephone terminal It is determined whether or not the group telephone service is subscribed, the dial receiving unit receives a dialed number output from the telephone terminal determined to be subscribed, and the SIP editing unit The dialed number received by the receiving unit and the caller number unique to the telephone terminal are edited into a SIP signal and transmitted to the connection control unit via the call determination unit. Based on the received SIP signal, the telephone terminal that has transmitted the off-hook signal is designated as the called side instead of the called side telephone terminal, and the fact is specified via the call determination unit. It may be configured to transmit to the constant section.

  In addition, when the hooking control unit acquires a hooking signal transmitted from a telephone terminal that is in a call, the telephone terminal that transmits the hooking signal with reference to the service subscription storage unit transmits the hooking control signal to the establishment group telephone service. The dial receiving unit obtains an extension number transmitted from a telephone terminal that has transmitted the hooking signal determined to be subscribed, and the SIP editing unit The extension number received by the receiving unit and the number unique to the telephone terminal that has transmitted the hooking signal are edited into a SIP signal and transmitted to the connection control unit, and the connection control unit receives the received SIP Based on the signal, instead of the telephone terminal that transmitted the hooking signal, the telephone terminal corresponding to the extension number is designated as the transfer destination, and the call Tough may be configured to be transmitted to the determining unit via the.

  The present invention also provides a plurality of telephone terminals, an IP conversion apparatus connected to be able to communicate with the plurality of telephone terminals, a subscriber server connected to be able to communicate with the IP conversion apparatus, and the subscriber server. A communication method in an IP telephone network including an application server connected to be communicable, wherein the IP conversion apparatus acquires an off-hook signal transmitted from a calling telephone terminal of the plurality of telephone terminals. , Referring to a service subscription storage unit that stores whether or not the telephone terminal is subscribed to the establishment group telephone service, whether or not the originating telephone terminal is subscribed to the establishment group telephone service. A step of determining, a step in which the IP conversion device receives a dialed number output from the telephone terminal on the calling side determined to be subscribed, and the IP conversion device Editing the dialed digits received by the dial receiving unit and the number unique to the calling telephone terminal into a SIP signal and transmitting it to the subscriber server; and the subscriber server, Based on a number unique to the telephone terminal included in the SIP signal, refer to a telephone terminal number storage unit in which a unique number is stored in the telephone terminal subscribing to the operator group telephone service, and the business It is determined whether or not the call is from a telephone terminal that subscribes to a group telephone service, and when it is determined that the call is from a telephone terminal that subscribes to the group telephone service, the application server Transmitting the SIP signal to the application server, and the application server, based on the dial digits included in the SIP signal, the dial digits and the The SIP signal is converted so as to include the number unique to the telephone terminal associated with the dialed digits with reference to a storage unit stored in association with the number unique to the talking terminal, and the converted SIP signal is Transmitting to the IP conversion device via the subscriber server; and the destination telephone terminal of the plurality of telephone terminals based on the converted SIP signal received from the subscriber server by the IP conversion device Extracting the accommodation location of the mobile phone, and the IP converter determines, based on the converted SIP signal, whether the destination telephone terminal has been called using the business office collective telephone service, Calling the destination telephone terminal based on the extracted accommodation location when called using the office group telephone service. It is a sign.

  When the IP conversion apparatus acquires an off-hook signal transmitted from a telephone terminal other than the destination telephone terminal at the extracted accommodation position, the telephone terminal refers to the service subscription storage unit and the telephone terminal A step of determining whether or not the group telephone service is subscribed; a step of receiving the dialed digits output from the telephone terminal determined to be subscribed by the IP converter; and the IP converter Editing the dialed digits received by the dial receiver and the caller number unique to the telephone terminal into a SIP signal and transmitting the SIP signal to the application server via the subscriber server; On the basis of the received SIP signal, the application server transmits the off-hook signal instead of the destination telephone terminal. It specifies the terminal as the call-and sending to that effect through the subscriber server to the IP conversion device may be further comprising configure.

  In addition, when the IP conversion apparatus acquires a hooking signal transmitted from a telephone terminal that is in a call, the telephone terminal that transmits the hooking signal with reference to the service subscription storage unit is referred to as the office group telephone service. A step of determining whether or not a subscriber has joined; a step of acquiring an extension number transmitted from a telephone terminal that has transmitted the hooking signal determined to be subscribed by the IP converter; and the IP converter Editing the extension number received by the dial receiving unit and the number unique to the telephone terminal that has transmitted the hooking signal into a SIP signal, and transmitting the SIP signal to the application server via the subscriber server And the application server transmits the hooking signal based on the received SIP signal. Instead, it specifies the telephone terminal corresponding to the extension number as the destination, and sending the fact via the subscriber server to the IP conversion device may be further comprising configure.

  The present invention also provides an IP telephone network comprising a plurality of telephone terminals, an IP converter connected to be communicable with the plurality of telephone terminals, and a subscriber server connected to be communicable with the IP converter. In the communication method according to claim 1, wherein when the IP conversion device acquires an off-hook signal transmitted from the originating telephone terminal of the plurality of telephone terminals, whether the telephone terminal subscribes to the office group telephone service. Determining whether or not the calling telephone terminal is subscribed to the establishment group telephone service by referring to a service subscription storage unit in which the IP conversion device is subscribed Receiving the dialed digits output from the originating telephone terminal determined to be, the IP conversion device receiving the dialed digits received by the dial receiving unit, Editing a SIP signal into a number unique to the originating telephone terminal and transmitting the SIP signal to the subscriber server; the subscriber server based on the number unique to the telephone terminal included in the SIP signal; A call from a telephone terminal subscribing to the office group telephone service with reference to a telephone terminal number storage unit storing a number unique to the telephone terminal subscribing to the operator group telephone service And when it is determined that the call is from a telephone terminal subscribing to the office group telephone service, the subscriber server adds the dialed number included in the SIP signal to the dialed number. Based on the storage unit in which the dialed number and the number unique to the telephone terminal are stored in association with each other, the number unique to the telephone terminal associated with the dialed number is included. Converting the SIP signal and transmitting the converted SIP signal to the IP converter, and the plurality of telephone terminals based on the converted SIP signal received by the IP converter from the subscriber server. Extracting the accommodation location of the destination telephone terminal in the network, and whether or not the IP conversion device is called using the establishment group telephone service based on the converted SIP signal. And calling the destination telephone terminal on the basis of the extracted accommodation location when called using the establishment group telephone service.

  When the IP conversion apparatus acquires an off-hook signal transmitted from a telephone terminal other than the destination telephone terminal at the extracted accommodation position, the telephone terminal refers to the service subscription storage unit and the telephone terminal A step of determining whether or not the group telephone service is subscribed; a step of receiving the dialed digits output from the telephone terminal determined to be subscribed by the IP converter; and the IP converter Editing the dialed number received by the dial receiving unit and the caller number unique to the telephone terminal into a SIP signal and transmitting the SIP signal to the subscriber server; and Based on the SIP signal, the telephone terminal that has transmitted the off-hook signal is designated as the called side instead of the called side telephone terminal, and the IP change is indicated accordingly. Transmitting to the device, it may be further comprising configure.

  In addition, when the IP conversion apparatus acquires a hooking signal transmitted from a telephone terminal that is in a call, the telephone terminal that transmits the hooking signal with reference to the service subscription storage unit is referred to as the office group telephone service. A step of determining whether or not a subscriber has joined; a step of acquiring an extension number transmitted from a telephone terminal that has transmitted the hooking signal determined to be subscribed by the IP converter; and the IP converter Editing the extension number received by the dial receiving unit and the number unique to the telephone terminal that has transmitted the hooking signal into a SIP signal and transmitting the SIP signal to the subscriber server; and However, based on the received SIP signal, a telephone terminal corresponding to the extension number is used instead of the telephone terminal that has transmitted the hooking signal. Designated as Okusaki, and sending to that effect to the IP conversion device may be further comprising configure.

  According to the present invention, the office group telephone service can be provided in the IP telephone network.

It is a figure which shows typically the IP telephone network which concerns on 1st embodiment of this invention. It is a block diagram which shows the IP converter which concerns on 1st embodiment of this invention, a subscriber server, and an application server. It is a flowchart for demonstrating the operation example of the IP telephone network which concerns on 1st embodiment of this invention. It is a flowchart for demonstrating the operation example of the IP telephone network which concerns on 1st embodiment of this invention. It is a flowchart for demonstrating the operation example of the IP telephone network which concerns on 1st embodiment of this invention. It is a flowchart for demonstrating the operation example of the IP telephone network which concerns on 1st embodiment of this invention. It is a flowchart for demonstrating the operation example of the IP telephone network which concerns on 1st embodiment of this invention. It is a flowchart for demonstrating the operation example of the IP telephone network which concerns on 1st embodiment of this invention. It is a block diagram which shows the IP converter and subscriber server which concern on 2nd embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate. Similar parts are denoted by the same reference numerals, and redundant description is omitted.

<First embodiment>
First, an IP telephone network according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram schematically showing an IP telephone network according to the first embodiment of the present invention. FIG. 2 is a block diagram showing the IP conversion device and the subscriber server according to the first embodiment of the present invention.

<IP telephone network>
As shown in FIG. 1, the IP telephone network 1 according to the first embodiment of the present invention can communicate with a plurality of telephone terminals 10-1 and 10-2 and the telephone terminals 10-1 and 10-2. A connected IP conversion device 20, a subscriber server 30 that is communicably connected to the IP conversion device 20, and an application server 40 that is communicably connected to the subscriber server 30 are provided.

≪Phone terminal≫
A telephone terminal 10 (10-1, 10-2) is a stationary telephone set installed in a business office or the like, a speaker for generating a ringing tone, a display for displaying a telephone number, and a receiver. A main body having a hook for placing a telephone number, a button for inputting a telephone number, and the like, and a receiver having a microphone and a speaker for calling. When the user lifts the handset of the telephone terminal 10 from the hook, the telephone terminal 10 transmits an off-hook signal to the IP conversion device 20. When the user places the handset of the telephone terminal 10 on the hook for a certain period of time (for example, 0.3 to 1.0 seconds) and lifts it from the hook, the telephone terminal 10 transmits a hooking signal to the IP conversion device 20. .

≪IP conversion device≫
The IP conversion device 20 converts an audio signal or the like transmitted from a telephone terminal which is an analog terminal or ISDN terminal into an IP packet, and transmits the IP packetized signal to an IP conversion device connected to the telephone terminal of the call destination, It is an apparatus that receives an IP packetized signal transmitted from an IP conversion apparatus connected to a telephone terminal of a call destination, decodes the received IP packetized signal, and transmits it to the telephone terminal 10.

  As shown in FIG. 2, the IP conversion device 20 includes a storage unit 21, a hooking control unit 22, a dial reception unit 23, a SIP editing unit 24, a storage location extraction unit 25, and a determination unit 26 as functional units. And comprising.

  The storage unit 21 includes a service subscription DB (Data Base) 21a, a PDT (Primary Dial Tone) sound source 21b, and a DT (Dial Tone) that stores whether or not the telephone terminal 10 is subscribed to the office group telephone service. A sound source 21c, a transmission pre-tra 21d that is information for determining the number of digits to be received, an SIR sound source 21e, an IR sound source 21f, an SDT (Second Dial Tone) sound source 21g, a CES melody sound source 21h, and an RBT (Ring Back Tone) sound source 21i.

When the hooking control unit 22 receives either the off-hook signal or the hooking signal transmitted from the telephone terminal 10, the hooking control unit 22 refers to the service subscription DB 21 a and stores the signal stored in one of the sound sources in the storage unit 21. It transmits to the telephone terminal 10.
In the present embodiment, when the hooking control unit 22 receives an off-hook signal transmitted from the telephone terminal 10, the hooking control unit 22 refers to the service subscription DB 21a to determine whether the telephone terminal 10 has subscribed to the office group telephone service. If it is determined that the PDT stored in the PDT sound source 21b is transmitted to the telephone terminal 10 when it is determined that the telephone terminal 10 is subscribed, DT is transmitted to the telephone terminal 10 when it is determined that the telephone terminal 10 is not subscribed. The DT stored in the sound source 21c is transmitted.
The telephone terminal 10 that has acquired the PDT generates a PDT sound, and the telephone terminal 10 that has acquired the DT generates a DT sound.

  The dial receiving unit 23 receives the dialed digits transmitted from the telephone terminal 10 and determines the number of received digits of the dialed digits based on the outgoing pretra 21d.

  The SIP editing unit 24 edits the dialed number received by the dial receiving unit 23 and the number unique to the calling telephone terminal into a SIP signal and transmits the SIP signal to the subscriber server 30.

  The accommodation position extraction unit 25 and the determination unit 26 will be described later.

≪Subscriber server≫
The subscriber server 30 includes a storage unit 31 and a call determination unit 32 as functional units.

  The storage unit 31 includes a service subscription DB (telephone terminal number storage unit) 31a in which a number unique to the telephone terminal that subscribes to the operator group telephone service is stored.

  The call determination unit 32 refers to the service subscription DB 31a based on the number unique to the telephone terminal included in the SIP signal, and determines whether the call is from a telephone terminal subscribing to the establishment group telephone service. When it is determined that the call is from a telephone terminal subscribing to the office group telephone service, a SIP signal is transmitted to the application server 40.

≪Application server≫
The application server 40 includes a storage unit 41 and a connection control unit 42 as functional units.

  The storage unit 41 stores dial numbers and numbers unique to the telephone terminal in association with each other, and also stores the number unique to the telephone terminal and the service contents of the business office group telephone service (for example, whether to restrict direct outgoing calls). Service content DB 41a is stored.

  The connection control unit 42 refers to the service content DB 41a based on the dial number included in the SIP signal, converts the SIP signal to include a number unique to the telephone terminal associated with the dial number, and converts the converted SIP signal. Is transmitted to the IP converter via the subscriber server.

≪IP conversion device≫
Here, the description related to the IP conversion apparatus 20 will be returned. Based on the converted SIP signal received from the subscriber server 30, the accommodation position extraction unit 25 extracts the accommodation positions of the destination telephone terminals in the plurality of telephone terminals 10-1 and 10-2.

  Based on the converted SIP signal, the determination unit 26 determines whether the destination telephone terminal has been called using the office group telephone service, and when the telephone terminal is called using the office group telephone service, The called telephone terminal is called based on the extracted accommodation position.

≪Extension call≫
Next, an example of an extension call in the IP communication network 1 will be described with reference to FIG. First, when the user of the telephone terminal 10-1 lifts the handset, the telephone terminal 10-1 transmits an off-hook signal to the IP conversion device 20 (step S1).

  Subsequently, the hooking control unit 22 of the IP conversion device 20 receives the off-hook signal and refers to the service subscription DB 21a to determine whether or not the telephone terminal 10-1 has subscribed to the office group telephone service (CES). Contract determination, step S2). In the present embodiment, the hooking control unit 22 determines that the subscriber is subscribed, and transmits the PDT stored in the PDT sound source 21b to the telephone terminal 10-1 (step S3). For example, the hooking control unit 22 stores a DB (not shown) in which the number unique to the telephone terminal stored in the storage unit 21 is associated with the accommodation position (the number indicating the physical position where the subscriber is accommodated). ) Based on the location where the off-hook signal is received, a number unique to the telephone terminal can be extracted, and the service subscription DB 21a can be referenced based on the extracted number.

  Subsequently, when the user of the telephone terminal 10-1 operates the button and inputs the extension number of the telephone terminal 10-2, the telephone terminal 10-1 transmits the extension number (dial signal) to the IP conversion device 20. (Step S4).

  Subsequently, when the dial receiving unit 23 of the IP conversion device 20 receives the dial signal, the SIP editing unit 24 of the IP conversion device 20 sets “extension number” as the called number and “phone number of the calling telephone terminal” as the calling number. The set INVITE signal is generated (SIP editing, step S5) and transmitted to the subscriber server 30 (step S6). For example, the dial receiving unit 23 stores a DB (not shown) in which the number unique to the telephone terminal stored in the storage unit 21 and the accommodation position (the number indicating the physical location where the subscriber is accommodated) are associated. ) Based on the location where the dial signal is received, a number unique to the telephone terminal can be extracted, and an INVITE signal as a SIP signal can be generated based on the extracted number.

  Subsequently, when receiving the INVITE signal, the call determination unit 32 of the subscriber server 30 refers to the service subscription DB 31a based on the calling number included in the INVVITE signal, and is a call from a telephone terminal subscribing to the service. (CES call determination, step S7). In the present embodiment, the call determination unit 32 determines that the call is from a subscribed telephone terminal, and transmits an INVITE signal to the application server 40 (step S8).

  Subsequently, when receiving the INVITE signal, the connection control unit 42 of the application server 40 recognizes that the call is an extension call based on the called number included in the INVITE signal and stores the call in the service content DB 41a. The telephone number of the telephone terminal corresponding to the extension number and the extension number corresponding to the telephone number of the calling telephone terminal are extracted with reference to the relationship between the extension number and the telephone number. Then, the connection control unit 42 sets an INVITE signal in which “the telephone number corresponding to the extension number” is set as the called number, “the extension number corresponding to the telephone number of the calling telephone terminal” is set as the calling number, and “extension” is set as the inside / outside display. Is generated (CES connection control, step S9) and transmitted to the subscriber server 30 (step S10).

  Subsequently, when receiving the INVITE signal, the call determination unit 32 of the subscriber server 30 transfers the INVITE signal to the IP conversion device 20 (step S11).

  Subsequently, when receiving the INVITE signal, the accommodation position extraction unit 25 of the IP conversion device 20 extracts the accommodation position of the telephone terminal 10-2 based on the called number included in the INVITE signal (accommodation position extraction, step S12). The extracted accommodation position and the INVITE signal are output to the determination unit 26. For example, the storage location extraction unit 25 associates a number unique to the telephone terminal and a storage location (a number indicating a physical location where the subscriber is stored) stored in the storage unit 21 as is well known. The storage position can be extracted by referring to the DB (not shown) based on the called number.

  Subsequently, when receiving the accommodation position and the INVITE signal, the determination unit 26 determines whether to transmit SIR or IR based on the inside / outside display included in the INVITE signal. In this embodiment, a determination part determines to transmit SIR and transmits SIR to the telephone terminal 10-2 (step S13).

  Subsequently, when the user of the telephone terminal 10-2 lifts the handset, the telephone terminal 10-2 transmits an off-hook signal to the IP conversion device 20 (step S14). With these operations, the telephone terminal 10-1 and the telephone terminal 10-2 can make an extension call (during a call, step S15).

≪Outgoing line transmission≫
Next, an example of outside line transmission in the IP telephone network 1 will be described with reference to FIG. In this example, the SIP signal (INVITE signal or the like) can be changed to an IP signal that can include data to be transmitted in the signal. First, when the user of the telephone terminal 10-1 lifts the handset, the telephone terminal 10-1 transmits an off-hook signal to the IP conversion device 20 (step S21).

  Subsequently, the hooking control unit 22 of the IP conversion device 20 receives the off-hook signal and refers to the service subscription DB 21a to determine whether or not the telephone terminal 10-1 has subscribed to the office group telephone service (CES). Contract determination (step S22). In the present embodiment, the hooking control unit 22 determines that the subscriber is subscribed, and transmits the PDT stored in the PDT sound source 21b to the telephone terminal 10-1 (step S23).

  Subsequently, when the user of the telephone terminal 10-1 operates the button and inputs the telephone number of the telephone terminal of the other party after the special number indicating the outside line transmission, the telephone terminal 10-1 is informed of the telephone number (dial Signal) is transmitted to the IP converter 20 (step S24).

  Subsequently, when the dial receiving unit 23 of the IP conversion device 20 receives the dial signal, the SIP editing unit 24 of the IP conversion device 20 sets “Special Number + Telephone Number” as the called number and “Telephone of the calling telephone terminal” as the calling number. An INVITE signal in which “number” is set is generated (SIP editing, step S25), and transmitted to the subscriber server 30 (step S26).

  Subsequently, when receiving the INVITE signal, the call determination unit 32 of the subscriber server 30 refers to the service subscription DB 31a based on the calling number included in the INVVITE signal, and is a call from a telephone terminal subscribing to the service. (CES call determination, step S27). In the present embodiment, the call determination unit 32 determines that the call is from a subscribed telephone terminal, and transmits an INVITE signal to the application server 40 (step S28).

  Subsequently, when receiving the INVITE signal, the connection control unit 42 of the application server 40 recognizes that the call is an outside line transmission based on the called number included in the INVITE signal, and adds “phone number” to the called number. Then, an INVITE signal in which “the telephone number of the calling telephone terminal” is set as the calling number is generated (CES connection control, step S29) and transmitted to the subscriber server 30 (step S30).

  Subsequently, when receiving the INVITE signal, the call determination unit 32 of the subscriber server 30 transfers the INVITE signal to the relay server 50 (step S31).

≪Outline incoming calls≫
Next, an example of outside line transmission in the IP telephone network 1 will be described with reference to FIG. In this example, the SIP signal (INVITE signal or the like) can be changed to an IP signal that can include data to be transmitted in the signal. First, when receiving the INVITE signal transferred from the relay server 50 (step S41), the call determination unit 32 of the subscriber server 30 refers to the service subscription DB 31a based on the called number included in the INVVITE signal and subscribes to the service. It is determined whether or not the call is to a telephone terminal that has been made (CES call determination; step S42). In the present embodiment, the call determination unit 32 determines that the call is to the subscribed telephone terminal, and transfers the INVITE signal to the application server 40 (step S43).

  Subsequently, when receiving the INVITE signal, the connection control unit 42 of the application server 40 performs the next operation (incoming call, disconnection, etc.) according to the service condition stored in the service content DB 41a, such as whether to accept incoming calls. ). In this embodiment, the connection control unit 42 generates an INVITE signal in which “phone number” is set as the called number, “phone number of the calling telephone terminal” as the calling number, and “outside line outgoing” is set as the inside / outside display (CES connection). Control, Step S44), an INVITE signal is transmitted to the subscriber server 30 (Step S45).

  Subsequently, when receiving the INVITE signal, the call determination unit 32 of the subscriber server 30 transfers the INVITE signal to the IP conversion device 20 (step S46).

  Subsequently, when receiving the INVITE signal, the accommodation position extraction unit 25 of the IP conversion device 20 extracts the accommodation position of the telephone terminal 10-2 based on the called number included in the INVITE signal (accommodation position extraction, step S47). The extracted accommodation position and the INVITE signal are output to the determination unit 26.

  Subsequently, when receiving the accommodation position and the INVITE signal, the determination unit 26 determines whether to transmit SIR or IR based on the inside / outside display included in the INVITE signal. In the present embodiment, the determination unit 26 determines to transmit IR, and transmits IR to the telephone terminal 10-2 (step S48).

  Subsequently, when the user of the telephone terminal 10-2 lifts the handset, the telephone terminal 10-2 transmits an off-hook signal to the IP conversion device 20 (step S49). With these operations, the telephone terminal 10-2 and the telephone terminal 10-3 that has made an outside line call can perform an outside line call (during a call, step S50).

≪Call pickup≫
Next, an example of call pickup in the IP communication network 1 will be described with reference to FIGS. Call pickup refers to a case where the telephone terminal 10-2 does not answer a call from another telephone terminal 10-3 among a plurality of telephone terminals 10-1 and 10-2 subscribing to the establishment group service. This is a function for the telephone terminal 10-1 to respond as a proxy.

  When the user of the telephone terminal 10-3 operates the button and inputs the telephone number of the telephone terminal (phone terminal 10-2) of the telephone call destination, the telephone terminal 10-3 converts the telephone number (dial signal) into IP conversion. It transmits to the apparatus 20 (step S61).

  Subsequently, when the dial receiving unit 23 of the IP conversion device 20 receives the dial signal, the SIP editing unit 24 of the IP conversion device 23 adds “the telephone number of the destination telephone terminal (telephone terminal 10-2)” to the called number. Then, an INVITE signal in which “the telephone number of the telephone terminal 10-3” is set as the calling party number is generated and transmitted to the subscriber server 30 (step S62). The INVITE signal is transferred to the IP conversion device 20 on the telephone terminals 10-1 and 10-2 via the subscriber server 30, the application server 40, and the subscriber server 30 on the telephone terminals 10-1 and 10-2. (Steps S63 to S66).

  Subsequently, when receiving the INVITE signal, the accommodation position extraction unit 25 of the IP conversion device 20 extracts the accommodation position of the telephone terminal 10-2 based on the called number included in the INVITE signal, and extracts the accommodation position and the INVITE. The signal is output to the determination unit 26.

  Subsequently, when receiving the accommodation position and the INVITE signal, the determination unit 26 determines whether to transmit SIR or IR based on the inside / outside display included in the INVITE signal. In the present embodiment, the determination unit determines to transmit IR and transmits IR to the telephone terminal 10-2 (Step S67). Further, the IP determination unit 26 transmits a response signal for the INVITE signal to the subscriber server 30 (step S68). The response signal is a signal generated based on the INVITE signal so as to include the telephone numbers of the telephone terminals 10-2 and 10-3, and is applied to the application server 40, the subscriber server 30, and the telephone terminal 10-3 side. The data is transferred to the IP conversion device 20 on the telephone terminal 10-3 side via the subscriber server 30 in order (steps S68 to S72). Here, the response signal transferred in steps S70 to S72 is a provisional response signal for transmitting the RBT to the telephone terminal 10-3. Subsequently, when receiving the response signal, the determination unit 26 of the IP conversion device 20 transmits the RBT stored in the RBT sound source 21i to the telephone terminal 10-3 (step S73).

  Subsequently, when the user of the telephone terminal 10-1 lifts the handset, the telephone terminal 10-1 transmits an off-hook signal to the IP conversion device 20 (step S74).

  Subsequently, the hooking control unit 22 of the IP conversion device 20 receives the off-hook signal and refers to the service subscription DB 21a to determine whether or not the telephone terminal 10-1 has subscribed to the office group telephone service (CES). Contract determination (step S75). In the present embodiment, the hooking control unit 22 determines that the subscriber is subscribed, and transmits the PDT stored in the PDT sound source 21b to the telephone terminal 10-1 (step S76).

  Subsequently, when the user of the telephone terminal 10-1 operates a button to input a special number (101 if no incoming extension number is specified, 109 + extension number if an incoming extension number is specified), the telephone terminal 10 -1 transmits the special number (dial signal) to the IP converter 20 (step S77).

  Subsequently, when the dial receiving unit 23 of the IP conversion device 20 receives the dial signal, the SIP editing unit 24 of the IP conversion device 20 sets “Special number” as the called number and “Telephone number of the calling telephone terminal” as the calling number. The set INVITE signal is generated and transmitted to the subscriber server 30 (step S78).

  Subsequently, when receiving the INVITE signal, the call determination unit 32 of the subscriber server 30 refers to the service subscription DB 31a based on the calling number included in the INVVITE signal, and is a call from a telephone terminal subscribing to the service. It is determined whether or not. In the present embodiment, the call determination unit 32 determines that the call is from a subscribed telephone terminal, and transfers the INVITE signal to the application server 40 (step S79).

  Subsequently, when receiving the INVITE signal, the connection control unit 42 of the application server 40 recognizes that the call is a call pickup on the basis of the called number included in the INVITE signal and calls the calling number included in the INVITE signal. Based on the call pickup, the call pickup operation is determined to be permitted. If it is determined that the operation is permitted, the telephone terminal 10-2 being called is identified (recognition of the pickup special number, identification of the calling telephone terminal. Step S80). In order to release the session between the telephone terminal 10-2 and the application server 40, a signal generated to include the telephone number of the telephone terminal 10-2 based on the INVIE signal transferred in step S79. A CANCEL signal is transmitted to the subscriber server 30 (step S81).

  Subsequently, when receiving the CANCEL signal, the call determination unit 32 of the subscriber server 30 releases the session and transfers the CANCEL signal to the IP conversion apparatus 20 (step S82).

  Subsequently, when the accommodation position extraction unit 25 of the IP conversion device 20 receives the CANCEL signal, the accommodation position extraction unit 25 outputs the CANCEL signal to the determination unit 26. When the determination unit 26 of the IP conversion device 20 acquires the CANCEL signal, the accommodation position extraction unit 25 outputs the CANCEL signal to the telephone terminal 10-2. Is stopped and a response signal to the CANCEL signal is transmitted to the subscriber server 30 (step S83). Such a response signal is a signal generated to include the telephone number of the telephone terminal 10-2 based on the CANCEL signal, and is transferred to the application server 40 (step S84).

  Subsequently, the connection control unit 42 of the application server 40 transmits an UPDATE signal to the subscriber server 30 (step S85). The UPDATE signal is a signal transmitted in response to the INVITE signal in steps S78 and S79, and is a signal including the telephone numbers of the telephone terminals 10-1 and 10-3 based on the INVITE signal and the like. The data is transferred to the IP conversion device 20 on the telephone terminal 10-3 side via the subscriber server 30 on the telephone terminal 10-3 side (steps S86 and S87).

  Subsequently, when receiving the UPDATE signal, the SIP editing unit 24 of the IP conversion device 20 transmits a response signal to the UPDATE signal to the subscriber server 30 (step S88). The response signal is a signal including the telephone numbers of the telephone terminals 10-1 and 10-3 based on the UPDATE signal, and the application server 40 via the subscriber server 30 on the telephone terminals 10-1 and 10-2 side. (Steps S89 and S90).

Note that steps S85 to S90 can be omitted if SDP (Session Description Protocol) is not used in the response signals in steps S68 to S72.
In the communication system according to the present embodiment, in the section between the IP conversion device 20 on the calling side (phone terminal 10-3 side) and the IP conversion device 20 on the called side (phone terminals 10-1 and 10-2 side). Although a call session is established by SIP, it is necessary to exchange the IP address set for the IP-side interface of each IP conversion device 20, the port number of UDP (User Datagram Protocol), etc. in the negotiation for establishing the session. Yes, the protocol used at that time is SDP. Such SDP is added to the payload portion of SIP (Session Initiation Protocol).

  Subsequently, the connection control unit 42 of the application server 40 transmits an INVITE signal to the subscriber server 30 on the side of the telephone terminals 10-1 and 10-2 (step S91). The INVITE signal is a signal in which “the telephone number of the telephone terminal (telephone terminal 10-1) to be called” is set as the called number and “the telephone number of the telephone terminal 10-3” is set as the calling number. It is transferred to the IP conversion device 20 on the -1, 10-2 side (step S92). In addition, the connection control unit 42 of the application server 40 transmits a response signal corresponding to the INVITE signal in steps S78 and S78 to the subscriber server 30 on the telephone terminals 10-1 and 10-2 side (step S93). The response signal is a signal generated to include the telephone numbers of the telephone terminals 10-1 and 10-3 based on the INVITE signal transferred in step S79, and is a subscriber server on the telephone terminal 10-3 side. 30 to the IP conversion device 20 on the telephone terminal 10-3 side (steps S94 and S95).

  Subsequently, when receiving the response signal, the accommodation position extraction unit 25 of the IP conversion device 20 on the telephone terminal 10-3 side extracts the accommodation position of the telephone terminal 10-3 based on the telephone number included in the response signal, The extracted accommodation position and response signal are output to the determination unit 26, and the determination unit 26 of the IP conversion device 20 transmits the response signal to the other telephone terminal 10-3 (step S96). Instead of the terminal 10-2, the telephone terminal 10-1 is designated as the destination telephone terminal, and the telephone terminal 10-1 and the telephone terminal 10-3 can make an external line call (during a call, step S97).

≪Transfer≫
Next, an example of transfer in the IP telephone network 1 will be described with reference to FIG. In this example, the SIP signal (INVITE signal or the like) can be changed to an IP signal that can include data to be transmitted in the signal. In a state in which the telephone terminal 10-1 and the telephone terminal 10-3 can make an external line call (during a call, step S101), the user of the telephone terminal 10-1 only for a certain time (for example, 0.3 to 1.0 seconds) When placed on the hook and lifted from the hook, the telephone terminal 10-1 transmits a hooking signal to the IP converter 20 (step S102).

  Subsequently, the hooking control unit 22 of the IP conversion device 20 receives the hooking signal, and refers to the service subscription DB 21a to determine whether or not the telephone terminal 10-1 is subscribed to the office group telephone service. In the present embodiment, the hooking control unit 22 determines that the telephone is subscribed, and transmits the SDT stored in the SDT sound source 21h to the telephone terminal 10-1 (step S103) and the telephone terminal 10-3. In response to this, the CES melody stored in the CES melody sound source 21g is transmitted (step S104). For example, the hooking control unit 22 stores a DB (not shown) in which the number unique to the telephone terminal stored in the storage unit 21 is associated with the accommodation position (the number indicating the physical position where the subscriber is accommodated). ) Based on the location where the hooking signal was received, a number unique to the telephone terminal can be extracted, and the service subscription DB 21a can be referenced based on the extracted number.

  Subsequently, when the user of the telephone terminal 10-1 operates the button and inputs the extension number of the transfer destination (for example, the extension number of the telephone terminal 10-2), the telephone terminal 10-1 displays the extension number (dial). Signal) is transmitted to the IP converter 20 (step S75).

  Subsequently, when the dial receiving unit 23 of the IP conversion device 20 receives the dial signal, the SIP editing unit 24 of the IP conversion device 20 sets the “transfer destination extension number” as the called number and “the telephone of the calling telephone terminal” as the calling number. An INVITE signal in which “number” is set is generated and transmitted to the subscriber server 30 (step S106). In this way, the telephone terminal 10-2 is designated as the transfer destination.

In the communication system and communication method in the IP telephone network 1 according to the first embodiment of the present invention, the function of the business office collective telephone service is assigned to the IP conversion device 20, the subscriber server 30 and the application server 40 in the IP telephone network 1. By sharing and defining the operation sequence between these devices, the office telephone group service can be realized in the IP telephone network 1.
In addition, the communication system and communication method in the IP telephone network 1 according to the first embodiment of the present invention can provide an office collective telephone service using existing devices and standard protocols in the IP telephone network 1. Therefore, the establishment group telephone service can be provided efficiently and economically as compared with the provision of the establishment group service in the PSTN that requires the maintenance of the subscriber exchange.

<Second Embodiment>
Next, an IP telephone network according to the second embodiment of the present invention will be described with reference to FIG. 9, focusing on differences from the IP telephone network 1 according to the first embodiment. As shown in FIG. 9, the IP telephone network according to the second embodiment of the present invention includes a subscriber server 100 instead of the subscriber server 30 and the application server 40. The subscriber server 100 is integrally provided with the functions of the subscriber server 30 and the application server 40 according to the first embodiment. Even in such an IP telephone network, the same operation as the IP telephone network 1 according to the first embodiment can be performed, and the same effect can be obtained.

DESCRIPTION OF SYMBOLS 1 IP telephone network 10-1, 10-2 Telephone terminal 20 IP conversion apparatus 30,100 Subscriber server 40 Application server

Claims (10)

A plurality of telephone terminals, an IP conversion apparatus communicably connected to the plurality of telephone terminals, a subscriber server communicably connected to the IP conversion apparatus, and a communicably connected to the subscriber server A communication system in an IP telephone network comprising an application server,
The IP converter is
A service subscription storage unit for storing whether or not the telephone terminal subscribes to a business group telephone service;
If the off-hook signal transmitted from the originating telephone terminal in the plurality of telephone terminals is acquired, whether the originating telephone terminal is subscribed to the establishment group telephone service with reference to the service subscription storage unit A hooking control unit for determining whether or not,
A dial receiving unit for receiving dialed digits output from the calling telephone terminal determined to be subscribed;
A SIP editing unit that edits the dialed number received by the dial receiving unit and a number unique to the calling telephone terminal into a SIP signal and transmits the SIP signal to the subscriber server;
With
The subscriber server is
A telephone terminal number storage unit for storing a number unique to the telephone terminal that subscribes to the operator group telephone service;
Based on a number unique to the telephone terminal included in the SIP signal, the telephone terminal number storage unit is referred to determine whether the call is from a telephone terminal subscribing to the office group telephone service. A call determination unit for transmitting the SIP signal to the application server when it is determined that the call is from a telephone terminal subscribing to the establishment group telephone service;
With
The application server is
A storage unit that stores the dialed digits and a number unique to the telephone terminal in association with each other;
The SIP signal is converted to include a number unique to the telephone terminal associated with the dialed number by referring to the storage unit based on the dialed number included in the SIP signal, and the converted SIP signal A connection control unit for transmitting to the IP conversion device via the subscriber server;
With
The IP conversion device further includes:
An accommodation position extraction unit for extracting an accommodation position of a destination telephone terminal in the plurality of telephone terminals based on the converted SIP signal received from the subscriber server;
Based on the converted SIP signal, it is determined whether or not the destination telephone terminal has been called using the establishment group telephone service, and extracted when the establishment group telephone service is called. A determination unit for calling the destination telephone terminal based on the received accommodation position;
A communication system in an IP telephone network, comprising: A communication system in an IP telephone network, comprising: a plurality of telephone terminals; an IP converter connected to be communicable with the plurality of telephone terminals; and a subscriber server connected to be communicable with the IP converter. ,
The IP converter is
A service subscription storage unit for storing whether or not the telephone terminal subscribes to a business group telephone service;
If the off-hook signal transmitted from the originating telephone terminal in the plurality of telephone terminals is acquired, whether the originating telephone terminal is subscribed to the establishment group telephone service with reference to the service subscription storage unit A hooking control unit for determining whether or not,
A dial receiving unit for receiving dialed digits output from the calling telephone terminal determined to be subscribed;
A SIP editing unit that edits the dialed number received by the dial receiving unit and a number unique to the calling telephone terminal into a SIP signal and transmits the SIP signal to the subscriber server;
With
The subscriber server is
A telephone terminal number storage unit for storing a number unique to the telephone terminal that subscribes to the operator group telephone service;
Based on a number unique to the telephone terminal included in the SIP signal, the telephone terminal number storage unit is referred to determine whether the call is from a telephone terminal subscribing to the office group telephone service. A call determination unit;
A storage unit that stores the dialed digits and a number unique to the telephone terminal in association with each other;
When it is determined that the call is from a telephone terminal subscribing to the business office group telephone service, the storage unit is referred to based on the dial digits included in the SIP signal and associated with the dial digits A connection control unit for converting the SIP signal to include a number unique to the telephone terminal and transmitting the converted SIP signal to the IP conversion device;
With
The IP conversion device further includes:
An accommodation position extraction unit for extracting an accommodation position of a destination telephone terminal in the plurality of telephone terminals based on the converted SIP signal received from the subscriber server;
Based on the converted SIP signal, it is determined whether or not the destination telephone terminal has been called using the establishment group telephone service, and extracted when the establishment group telephone service is called. A determination unit for calling the destination telephone terminal based on the received accommodation position;
A communication system in an IP telephone network, comprising: When the hooking control unit acquires an off-hook signal transmitted from a telephone terminal other than the destination telephone terminal at the extracted accommodation location, the telephone terminal refers to the service subscription storage unit and the telephone terminal Determine whether you are subscribed to the group telephone service,
The dial receiving unit receives dialed digits output from the telephone terminal determined to be subscribed;
The SIP editing unit edits the dialed number received by the dial receiving unit and a caller number unique to the telephone terminal into a SIP signal and transmits the SIP signal to the connection control unit via the call determination unit. And
Based on the received SIP signal, the connection control unit designates the telephone terminal that has transmitted the off-hook signal as a called side instead of the called side telephone terminal, and notifies that via the call determination unit. The communication system in the IP telephone network according to claim 1, wherein the communication is transmitted to the determination unit. When the hooking control unit acquires a hooking signal transmitted from a telephone terminal in a call, the telephone terminal that transmitted the hooking signal with reference to the service subscription storage unit subscribes to the business group telephone service. Whether or not
The dial receiving unit acquires an extension number transmitted from a telephone terminal that has transmitted the hooking signal determined to be subscribed;
The SIP editing unit edits the extension number received by the dial receiving unit and the number unique to the telephone terminal that has transmitted the hooking signal into a SIP signal and transmits the SIP signal to the connection control unit,
Based on the received SIP signal, the connection control unit designates a telephone terminal corresponding to the extension number as a transfer destination instead of the telephone terminal that transmitted the hooking signal, and notifies the call determination unit to that effect. The communication system in the IP telephone network according to claim 1, wherein the communication system transmits the data to the determination unit via the IP telephone network. A plurality of telephone terminals, an IP conversion apparatus communicably connected to the plurality of telephone terminals, a subscriber server communicably connected to the IP conversion apparatus, and a communicably connected to the subscriber server A communication method in an IP telephone network comprising an application server,
A service that stores whether or not the telephone terminal is subscribed to a business office collective telephone service when the IP conversion apparatus acquires an off-hook signal transmitted from the calling telephone terminal of the plurality of telephone terminals. Determining whether the calling telephone terminal subscribes to the establishment group telephone service with reference to a subscription storage unit;
Receiving the dialed digits output from the calling telephone terminal determined to be subscribed by the IP conversion device;
The IP conversion device editing the dialed number received by the dial receiving unit and the number unique to the calling telephone terminal into a SIP signal and transmitting the SIP signal to the subscriber server;
A telephone terminal number storage unit in which the subscriber server stores a number unique to the telephone terminal subscribing to the operator group telephone service based on a number unique to the telephone terminal included in the SIP signal To determine whether the call is from a telephone terminal subscribing to the office group telephone service, and to determine that the call is from a telephone terminal subscribing to the office group telephone service. Sending the SIP signal to the application server when
Based on the dial digits included in the SIP signal, the application server is associated with the dial digits by referring to a storage unit that stores the dial digits and a number unique to the telephone terminal in association with each other. Converting the SIP signal to include a number unique to the telephone terminal, and transmitting the converted SIP signal to the IP conversion device via the subscriber server;
The IP conversion device, based on the converted SIP signal received from the subscriber server, to extract the accommodation position of the destination telephone terminal in the plurality of telephone terminals;
Based on the converted SIP signal, the IP conversion device determines whether the destination telephone terminal is called using the establishment group telephone service, and is called using the establishment group telephone service. And calling the destination telephone terminal based on the extracted accommodation position,
A communication method in an IP telephone network. When the IP conversion apparatus acquires an off-hook signal transmitted from a telephone terminal other than the destination telephone terminal at the extracted accommodation position, the telephone terminal refers to the service subscription storage unit and the telephone terminal Determining whether or not to subscribe to a group telephone service;
Receiving a dialed number output from the telephone terminal determined to be subscribed by the IP conversion device;
The IP conversion device edits the dialed number received by the dial receiving unit and the caller number unique to the telephone terminal into a SIP signal and transmits the SIP signal to the application server via the subscriber server. Steps,
Based on the received SIP signal, the application server designates the telephone terminal that has transmitted the off-hook signal as the called party instead of the called telephone terminal, and notifies the fact via the subscriber server. Transmitting to the IP conversion device;
The communication method in the IP telephone network according to claim 5, further comprising: When the IP conversion apparatus acquires a hooking signal transmitted from a telephone terminal in a call, the telephone terminal that transmitted the hooking signal with reference to the service subscription storage unit subscribes to the business group telephone service. Determining whether or not
Obtaining an extension number transmitted from the telephone terminal that has transmitted the hooking signal determined to be subscribed by the IP conversion device;
The IP conversion device edits the extension number received by the dial receiving unit and the number unique to the telephone terminal that has transmitted the hooking signal into a SIP signal, and the application server via the subscriber server Sending to
Based on the received SIP signal, the application server designates a telephone terminal corresponding to the extension number as a transfer destination in place of the telephone terminal that has transmitted the hooking signal, and notifies that via the subscriber server. Transmitting to the IP conversion device;
The communication method in the IP telephone network according to claim 5, further comprising: A communication method in an IP telephone network, comprising: a plurality of telephone terminals; an IP converter connected to be communicable with the plurality of telephone terminals; and a subscriber server connected to be communicable with the IP converter. ,
A service that stores whether or not the telephone terminal is subscribed to a business office collective telephone service when the IP conversion apparatus acquires an off-hook signal transmitted from the calling telephone terminal of the plurality of telephone terminals. Determining whether the calling telephone terminal subscribes to the establishment group telephone service with reference to a subscription storage unit;
Receiving the dialed digits output from the calling telephone terminal determined to be subscribed by the IP conversion device;
The IP conversion device editing the dialed number received by the dial receiving unit and the number unique to the calling telephone terminal into a SIP signal and transmitting the SIP signal to the subscriber server;
A telephone terminal number storage unit in which the subscriber server stores a number unique to the telephone terminal subscribing to the operator group telephone service based on a number unique to the telephone terminal included in the SIP signal And determining whether the call is from a telephone terminal subscribing to the establishment group telephone service;
When it is determined that the call is from a telephone terminal subscribing to the business office group telephone service, the subscriber server determines that the dialed number and the telephone are based on the dialed number included in the SIP signal. The SIP signal is converted so as to include a number unique to the telephone terminal associated with the dialed digits with reference to a storage unit that is stored in association with a number unique to the terminal, and the converted SIP signal is converted to the converted SIP signal. Transmitting to the IP conversion device;
The IP conversion device, based on the converted SIP signal received from the subscriber server, to extract the accommodation position of the destination telephone terminal in the plurality of telephone terminals;
Based on the converted SIP signal, the IP conversion device determines whether the destination telephone terminal is called using the establishment group telephone service, and is called using the establishment group telephone service. And calling the destination telephone terminal based on the extracted accommodation position,
A communication method in an IP telephone network. When the IP conversion apparatus acquires an off-hook signal transmitted from a telephone terminal other than the destination telephone terminal at the extracted accommodation position, the telephone terminal refers to the service subscription storage unit and the telephone terminal Determining whether or not to subscribe to a group telephone service;
Receiving a dialed number output from the telephone terminal determined to be subscribed by the IP conversion device;
The IP conversion device editing the dialed number received by the dial receiving unit and the caller number unique to the telephone terminal into a SIP signal and transmitting the SIP signal to the subscriber server;
Based on the received SIP signal, the subscriber server designates the telephone terminal that has transmitted the off-hook signal as the called party instead of the called telephone terminal, and transmits the fact to the IP converter. Steps,
The communication method in the IP telephone network according to claim 8, further comprising: When the IP conversion apparatus acquires a hooking signal transmitted from a telephone terminal in a call, the telephone terminal that transmitted the hooking signal with reference to the service subscription storage unit subscribes to the business group telephone service. Determining whether or not
Obtaining an extension number transmitted from the telephone terminal that has transmitted the hooking signal determined to be subscribed by the IP conversion device;
The IP conversion device editing the extension number received by the dial receiver and the number unique to the telephone terminal that has transmitted the hooking signal into a SIP signal and transmitting the SIP signal to the subscriber server;
Based on the received SIP signal, the subscriber server designates a telephone terminal corresponding to the extension number as a transfer destination instead of the telephone terminal that has transmitted the hooking signal, and notifies the IP conversion device to that effect. Sending, and
The communication method in the IP telephone network according to claim 8, further comprising:

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