JP6468081B2 - Wireless telephone terminal, program, and extension telephone system construction method - Google Patents

Description

  The present invention relates to a technique for constructing an extension telephone system using a radiotelephone terminal without specially installing a call control server, and more particularly to a technique suitable for constructing an extension telephone system capable of suppressing communication costs.

  Patent Document 1 discloses a technique for constructing an extension telephone system without specially installing a call control server. In this technology, each IP (Internet Protocol) telephone terminal has a call control server function for processing call control such as outgoing and incoming calls and transfer of each IP telephone terminal. Only a specific IP telephone terminal determined between the IP telephone terminals enables this call control server function and processes call control of all IP telephone terminals including the own IP telephone terminal. Thereby, an extension telephone system is constructed.

JP 2008-205699 A

  The technique described in Patent Document 1 is very effective when an extension telephone system is constructed using a plurality of wired telephone terminals. However, the technique described in Patent Document 1 does not consider the case where an extension telephone system is constructed using a plurality of wireless telephone terminals distributed at geographically distant locations via a communication packet network. In addition, when building an extension telephone system via a communication packet network in which the amount of packets that can be used at a flat rate is limited, the packet usage of the wireless telephone terminal that enables the call control server function is used at a flat rate. If the amount of packets that can be exceeded is exceeded, additional charges are incurred and communication costs increase. The technique described in Patent Document 1 does not consider this point.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to construct an extension telephone system via a communication packet network using a radiotelephone terminal without specially installing a call control server. It is in providing a suitable technique. Another object of the present invention is to suppress the call cost of the extension telephone system as a whole.

  In order to solve the above-described problems, in the present invention, a plurality of wireless telephone terminals having a call control server function are connected to a VPN (Virtual Private Network) router by VPN, so that these wireless telephone terminals are connected via a communication packet network. These wireless telephone terminals are connected to the same private network even if they are dispersed in geographically distant locations. Also specified by the amount of packets that can be used at a flat rate by the communication service of the communication packet network and the amount of packets used from the start date of the unfinished billing period for each of multiple wireless telephone terminals connected to the same private network Based on the received packet consumption data, a wireless telephone terminal that activates the call control server function is determined from these wireless telephone terminals. Then, only the determined call control server function of the radio telephone terminal is enabled, and this radio telephone terminal is caused to perform call control of a plurality of radio telephone terminals connected to the same private network.

For example, the present invention is a radiotelephone terminal having a call control server function,
VPN connection means for performing VPN connection, which is a connection form limited between predetermined addresses via a communication packet network,
Communication means for communicating with another wireless telephone terminals connected the same private network and the radio telephone terminal via the VPN connection,
Validity / invalidity of the call control server function of its own radiotelephone terminal so that only one of the radiotelephone terminals connected to the private network activates the call control server function A setting means for setting
Call control server means for performing call control of each wireless telephone terminal connected to the private network when the call control server function of the own wireless telephone terminal is set to be valid;
When the call control server function of the own radiotelephone terminal is set to be valid, the amount of packets that can be used at a flat rate by the communication service of the communication packet network used by the own radiotelephone terminal and the start date of the chargeable period Wirelessly connected to the private network based on the packet consumption data specified by the packet usage from and the packet consumption data acquired from each of the other wireless telephone terminals connected to the private network Determining means for determining a radiotelephone terminal that activates the call control server function from among the telephone terminals;
The setting means includes
When the call control server function of the own wireless telephone terminal is set to be valid, the wireless means for enabling the other wireless telephone terminal connected to the private network to enable the call control server function by the determining means If determined to be a telephone terminal, request the activation of the call control server function to the other radio telephone terminal, set the call control server function of its own radio telephone terminal to invalid,
When the call control server function of the own wireless telephone terminal is set to invalid, the activation of the call control server function of the own wireless telephone terminal is requested by another wireless telephone terminal connected to the private network. If so, the call control server function of the own radiotelephone terminal is set to be valid.

  According to the present invention, a plurality of wireless telephone terminals having a call control server function are connected by VPN via a communication packet network, so that these wireless telephone terminals are joined to the same private network, and among these wireless telephone terminals, Any one of the wireless telephone terminals in which the call control server function is enabled can perform call control of these wireless telephone terminals. For this reason, even when a plurality of wireless telephone terminals are dispersed at geographically distant locations via a communication packet network, extension telephones can be used without specially installing a call control server using these wireless telephone terminals. A system can be constructed.

  Further, according to the present invention, the packet consumption data of each radiotelephone terminal specified by the amount of packets that can be used at a fixed charge by the communication service of the communication packet network and the amount of packets used from the start date of the unfinished billing period Is used to determine the wireless telephone terminal that enables the call control server function, so the call control server function is enabled so that the total usage charge of the communication packet network by multiple wireless telephone terminals is minimized. The radio telephone terminal to be switched can be switched. Therefore, the call cost of the extension telephone system as a whole can be suppressed.

FIG. 1 is a schematic configuration diagram of an extension telephone system according to an embodiment of the present invention. FIG. 2 is a sequence diagram for explaining the extension subscription operation of the extension telephone system according to the embodiment of the present invention. FIG. 3 is a sequence diagram for explaining the call control server switching operation of the extension telephone system according to the embodiment of the present invention. FIG. 4 is a sequence diagram (continuation of FIG. 3) for explaining the call control server switching operation of the extension telephone system according to the embodiment of the present invention. FIG. 5 is a schematic functional configuration diagram of the radio telephone terminal 1. FIG. 6 is a flowchart for explaining the operation of the radio telephone terminal 1. FIG. 7 is a flowchart for explaining the extension joining process S2 shown in FIG. FIG. 8 is a flowchart for explaining the various setting / call control server stop processing S4 shown in FIG. FIG. 9 is a flowchart for explaining the various setting / call control server activation processing S5 shown in FIG. FIG. 10 is a flowchart for explaining the extension departure processing S7 shown in FIG.

  An embodiment of the present invention will be described below.

  FIG. 1 is a schematic configuration diagram of an extension telephone system according to the present embodiment.

  As shown in the figure, the extension telephone system according to the present embodiment includes a plurality of wireless telephone terminals 1-1 to 1-3 (hereinafter also simply referred to as wireless telephone terminals 1) and a VPN router 2. Composed.

  The wireless telephone terminal 1 participates in a private network under the VPN router 2 constructed on the communication packet network 3 by making a VPN connection with the VPN router 2 via the communication packet network 3 such as 3G, 4GLTE (Long Term Evolution). To do. The wireless telephone terminal 1 has a call control server function for IP telephones, and one of the wireless telephone terminals 1 participating in the private network under the VPN router 2 The control server function is enabled to connect to the IP telephone network 4, and call control of each wireless telephone terminal 1 (including its own wireless telephone terminal 1) participating in the private network under the VPN router 2 is performed. Here, in order to make the figure easy to understand, the IP telephone network 4 is shown separated from the communication packet network 3, but the IP telephone network 4 is actually constructed on the communication packet network 3.

  FIG. 2 is a sequence diagram for explaining the extension subscription operation of the extension telephone system according to the present embodiment. Here, it is assumed that none of the wireless telephone terminals 1-1 to 1-3 participates in the private network under the VPN router 2 in the initial state and disables the call control server function. .

  First, it is assumed that the radio telephone terminal 1-1 receives an extension joining operation for joining the extension telephone system from a user (S100). In response, the wireless telephone terminal 1-1 makes a VPN connection to the VPN router 2 via the communication packet network 3 (S101), and participates in the private network under the VPN router 2.

  Next, the wireless telephone terminal 1-1 repeats the attribution request to the private network under the VPN router 2 several times until the attribution permission notice is sent from the wireless telephone terminal 1 for which the call control server function is valid. Information is transmitted (S102). However, the wireless telephone terminal 1 participating in the private network at this time is only the wireless telephone terminal 1-1, and therefore no attribution permission notification is sent.

  Next, when the wireless telephone terminal 1-1 times out due to the elapse of a predetermined time without receiving an attribution permission notification (S103), the wireless telephone terminal 1-1 is charged at a fixed rate by the communication service of the communication packet network 3 to which the user is subscribed. Monitoring of the remaining amount of packet that can be used by the end date of the accounting target period is started (S104). Further, the radio telephone terminal 1-1 enables the call control server function (S105) and sends a registration request including the external line number of the extension telephone system and the address of the own radio telephone terminal 1-1 to the IP telephone network 4 (specifically, Is transmitted to a call control server (not shown) on the IP telephone network 4 (S106). When registration in the IP telephone network 4 is completed (S107) and a completion notification is received from the IP telephone network 4 (S108), the wireless telephone terminal 1-1 receives its extension number, address, and user information. The included terminal information is registered as call control target terminal information, and a server activation notice is broadcast to the private network under the VPN router 2 (S109).

  Thereafter, it is assumed that the wireless telephone terminal 1-2 receives an extension joining operation from the user (S110). In response, the wireless telephone terminal 1-2 makes a VPN connection to the VPN router 2 via the communication packet network 3 (S111), and participates in the private network under the VPN router 2.

  Next, the wireless telephone terminal 1-2 repeats the attribution request multiple times to the private network under the VPN router 2 until the attribution permission notice is sent from the wireless telephone terminal 1 for which the call control server function is enabled. Information is transmitted (S112). Here, since the wireless telephone terminal 1-1 has enabled the call control server function, when receiving the attribution request, the attribution request notification is transmitted to the radio telephone terminal 1-2 that is the transmission source of the attribution request ( S113).

  When the wireless telephone terminal 1-2 receives the attribution permission notification from the wireless telephone terminal 1-1, the wireless telephone terminal 1-2 registers the wireless telephone terminal 1-1 as a call control server of the extension telephone system. In addition, a registration request including the extension number, address, and user information of the own wireless telephone terminal 1-2 is transmitted to the wireless telephone terminal 1-1 (S114).

  In response, the wireless telephone terminal 1-1 registers the extension number, address, and user information of the wireless telephone terminal 1-2 as terminal information for call control (S115). In addition, the radio telephone terminal 1-1 sends an update notification including the terminal information of the call control target (radio telephone terminals 1-1 and 1-2) to all the call control target radios other than the own radio telephone terminal 1-1. It is transmitted to the telephone terminal 1 (here, only the radio telephone terminal 1-2) (S116).

  When the wireless telephone terminal 1-2 receives the update notification from the wireless telephone terminal 1-1, the terminal information of the call control target included in the update notification is transmitted to the wireless telephone terminal 1 that is subscribed to the extension telephone system. Registration as terminal information (S117).

  In addition, the wireless telephone terminal 1-1 transmits a state notification including the current call control state (standby) to the wireless telephone terminal 1-2 that is the transmission source of the registration request (S118). When the wireless telephone terminal 1-2 receives the state notification from the wireless telephone terminal 1-1, the wireless telephone terminal 1-2 shifts its own state to the call control state (in standby state) included in the state notification (S119). .

  Although not shown, when the wireless telephone terminal 1-3 accepts an extension extension operation from the user, the same processing (S101 to S119) as that of the wireless telephone terminal 1-2 is performed, and the wireless telephone terminal 1-3 belongs to the wireless telephone terminal 1-1 that participates in the private network under the VPN router 2 and enables the call control server function. Further, the current call control state is acquired from the wireless telephone terminal 1-1, and this call control state is reflected on the own wireless telephone terminal 1-3.

  3 and 4 are sequence diagrams for explaining the call control server switching operation of the extension telephone system according to the present embodiment. Here, in the initial state, all of the radio telephone terminals 1-1 to 1-3 participate in the private network under the VPN router 2 and subscribe to the extension telephone system. Assume that the call control server function is enabled.

  The wireless telephone terminal 1-1 in which the call control server function is enabled has a predetermined remaining amount of packets that can be used by the communication service of the communication packet network 3 to which the user has subscribed at a fixed charge before the end date of the chargeable period. , A wireless telephone terminal 1-2 in which terminal information is registered as a call control target, is detected (S130). A packet remaining amount request is transmitted to 1-3 (S131). Receiving this, the radio telephone terminal 1-2 measures the remaining amount of packet that can be used by the communication service of the communication packet network 3 to which the user is subscribed at a fixed charge until the end date of the chargeable period (S132). The packet remaining amount notification including the calculated packet remaining amount is transmitted to the wireless telephone terminal 1-1 (S133). Similarly, the wireless telephone terminal 1-3 also measures the remaining amount of packet that can be used by the communication service of the communication packet network 3 to which the user is subscribed at a fixed charge until the end date of the chargeable period (S134). A packet remaining amount notification including the packet remaining amount is transmitted to the wireless telephone terminal 1-1 (S135).

  Next, the wireless telephone terminal 1-1 receives the packet remaining amount included in the packet remaining amount notification received from each of the wireless telephone terminals 1-2 and 1-3, and the packet remaining amount of the own wireless telephone terminal 1-1. Compared with, the call control server to reduce the communication cost of the extension telephone system as a whole (prevent or minimize additional charges due to packet usage exceeding the amount of packets that can be used at a flat rate) It is determined whether or not the wireless telephone terminal 1 that enables the function can be switched. If it is determined that switching is possible, the wireless telephone terminal 1 that activates the call control server function is determined (S136).

  Specifically, when there is a wireless telephone terminal 1 having a larger amount of remaining packets than the own wireless telephone terminal 1-1, the wireless telephone terminal 1 that enables the call control server function is switched to another wireless telephone terminal 1. Judge that it is possible. Then, the wireless telephone terminal 1 having the largest remaining packet amount among the other wireless telephone terminals 1 other than the own wireless telephone terminal 1-1 is determined as the wireless telephone terminal 1 that enables the call control server function. Here, the radio telephone terminal 1-1 determines that the radio telephone terminal 1 that enables the call control server function can be switched, and connects the radio telephone terminal 1-3 to the radio telephone terminal 1 that enables the call control server function. It shall be decided.

  The radio telephone terminal 1-1 transmits a backup server request to the radio telephone terminal 1-3 (S137). In response to this, the radio telephone terminal 1-3 sets its own radio telephone terminal 1-3 as a spare server and transmits a spare server response to the radio telephone terminal 1-1 (S138).

  When the wireless telephone terminal 1-1 receives the backup server response from the wireless telephone terminal 1-3, the wireless telephone terminal 1-1 can be used by the fixed price of the communication service of the communication packet network 3 to which the user subscribes until the end date of the chargeable period. The monitoring of the remaining amount of packets is stopped (S139). Further, the wireless telephone terminal 1-1 sends a registration cancellation request including the external line number of the extension telephone system and the address of the own wireless telephone terminal 1-1 to the IP telephone network 4 (specifically, the illustration on the IP telephone network 4 is shown). (S140). When receiving the registration cancellation request from the wireless telephone terminal 1-1, the IP telephone network 4 cancels the registration of the wireless telephone terminal 1-1 (S141) and transmits a registration cancellation completion notification (S142). When receiving the registration cancellation completion notification from the IP telephone network 4, the wireless telephone terminal 1-1 invalidates its own call control server function (S143). Further, a server stop notification is transmitted to the call control target radio telephone terminals 1-2 and 1-3 other than the own radio telephone terminal 1-1 (S144). In response to this, the radio telephone terminals 1-2 and 1-3 delete the registration of the radio telephone terminal 1-1 as the call control server of the extension telephone system.

  Further, since the wireless telephone terminal 1-3 is a spare server, it monitors the remaining amount of packets that can be used by the communication service of the communication packet network 3 to which the user is subscribed at a fixed charge by the end date of the chargeable day. Start (S145). The wireless telephone terminal 1-3 enables the call control server function (S146), and sends a registration request including the external line number of the extension telephone system and the address of the own wireless telephone terminal 1-3 to the IP telephone network 4 (specifically, Is transmitted to a call control server (not shown) on the IP telephone network 4 (S147). When registration in the IP telephone network 4 is completed (S148) and a completion notification is received from the IP telephone network 4 (S149), the wireless telephone terminal 1-3 stores its extension number, address, and user information. The server information is registered as call control target terminal information, and a server activation notification is broadcast to the private network under the VPN router 2 (S150).

  When receiving the server activation notification from the radio telephone terminal 1-3, the radio telephone terminals 1-1 and 1-2 register the radio telephone terminal 1-3 as a call control server of the extension telephone system. In addition, a registration request including the extension numbers, addresses, and user information of the own wireless telephone terminals 1-1 and 1-2 is transmitted to the wireless telephone terminal 1-3 (S151 and S152). In response to this, the radio telephone terminal 1-3 registers the extension numbers, addresses, and user information of the radio telephone terminals 1-1 and 1-2 as terminal information for call control (S153).

  Next, the radio telephone terminal 1-3 sends an update notification including the terminal information of the call control target (radio telephone terminals 1-1, 1-2, 1-3) to the call control excluding its own radio telephone terminal 1-3. The data is transmitted to the target radio telephone terminals 1-1 and 1-2 (S154). When the wireless telephone terminals 1-1 and 1-2 receive the update notification from the wireless telephone terminal 1-3, the terminal information of the call control target included in the update notification is wirelessly subscribed to the extension telephone system. Registration as terminal information of the telephone terminal 1 (S155, S156).

  In addition, the wireless telephone terminal 1-3 transmits a state notification including the current call control state (in standby state here) to the wireless telephone terminals 1-1 and 1-2 that are the transmission source of the registration request (S157). ). When receiving the status notification from the radio phone terminal 1-3, the radio telephone terminals 1-1 and 1-2 shift their own status to the call control status (in this case, standby) included in the status notice. (S158, S159).

  Next, details of the wireless telephone terminal 1 will be described. Since the VPN router 2 can use an existing device, detailed description thereof is omitted.

  FIG. 5 is a schematic functional configuration diagram of the radio telephone terminal 1.

  As shown in the figure, the radio telephone terminal 1 includes a communication packet network interface unit 100, a man-machine interface unit 101, an IP telephone network communication unit 102, a VPN connection unit 103, a PN communication unit 104, and an IP phone processing unit. 105, a call control server processing unit 106, a packet remaining amount notifying unit 107, a packet remaining amount measuring unit 108, and a main control unit 109.

  The communication packet network interface unit 100 is an interface for wirelessly connecting to a communication packet network 3 such as 3G or 4GLTE.

  The man-machine interface unit 101 is an interface for a user to perform telephone calls and various operations. Although not shown, the man-machine interface unit 101 includes a microphone, a speaker, an operation unit such as a dial key, and a display such as an LCD and an LED. Prepare.

  The IP telephone network communication unit 102 controls communication with the IP telephone network 4 via the communication packet network interface unit 100 and the communication packet network 3.

  The VPN connection unit 103 makes a VPN connection to the VPN router 2 via the communication packet network interface unit 100 and the communication packet network 3. Thereby, the radio telephone terminal 1 participates in the private network under the VPN router 2.

  The PN communication unit 104 controls communication with other wireless telephone terminals 1 participating in the private network under the VPN router 2 via the VPN connection unit 103.

  The IP telephone processing unit 105 performs processing necessary to operate as an IP telephone. Specifically, in accordance with a call control protocol such as SIP (Session Initiation Protocol), a session control is performed by exchanging a call control message with a communication partner (IP telephone network 4 or other wireless telephone terminal 1) via a call control server. Establish / release. In addition, according to a transmission protocol such as RTP (Realtime Transport Protocol), a voice signal input by the user via the man-machine interface unit 101 is encoded into call data and transmitted to the communication partner via the session. The call data is received via the session, and the call data is decoded into a voice signal and output from the man-machine interface unit 101 as a voice.

  The IP telephone processing unit 105 includes a registration request unit 1051 and a state reflection unit 1052. When the call control server function of the own radiotelephone terminal 1 is set to invalid, the registration request unit 1051 sends the radio request to the radiotelephone terminal 1 functioning as a call control server via the PN communication unit 104. A registration request including the extension number, address and user information of the telephone terminal 1 is transmitted. When the state reflection unit 1052 receives a call control state notification from the wireless telephone terminal 1 functioning as a call control server via the PN communication unit 104, the state reflection unit 1052 responds to the call control state indicated by the state notification. Implement the process. For example, if the call control state is standby, a standby screen is displayed on the display of the man-machine interface unit 101. If the call control state is an incoming call, a ring tone is output to the speaker of the man-machine interface unit 101, and an incoming call screen is displayed on the display of the man-machine interface unit 101. If the call control state is busy, a message indicating that the call is in progress is displayed on the display of the man-machine interface unit 101. If the call control state is on hold, a message indicating that the call control state is on hold is displayed on the display of the man-machine interface unit 101.

  The call control server processing unit 106 performs processing necessary to operate as a call control server when the call control server function of the own wireless telephone terminal 1 is set to be valid. Specifically, a registration request including the external line number of the extension telephone system and the address of the own wireless telephone terminal 1 is transmitted to the IP telephone network 4 (specifically, a call control server (not shown) on the IP telephone network 4). Then, the own wireless telephone terminal 1 is registered in the IP telephone network 4. Further, according to a call control protocol such as SIP, a call control message exchanged between any wireless telephone terminal 1 including its own wireless telephone terminal 1 and a communication partner (IP telephone network 4 or another wireless telephone terminal 1). To establish a session between the two, or release the session established between the two.

  In addition, the call control server processing unit 106 includes a call control state notification unit 1061. When the call control server processing unit 106 registers the radio telephone terminal 1 as the registration request source as the radio telephone terminal 1 subject to call control in accordance with the registration request received from the other radio telephone terminal 1 via the PN communication unit 104, The call control state notification unit 1061 notifies the state request including the current call control state in the call control server processing unit 106 to the wireless telephone terminal 1 that is the registration request source via the PN communication unit 104.

  The packet remaining amount notifying unit 107 obtains the packet remaining amount from the packet remaining amount measuring unit 108 according to the packet remaining amount request received from the other wireless telephone terminal 1 functioning as a call control server via the PN communication unit 104. Then, a packet remaining amount notification including this packet remaining amount is transmitted to the wireless telephone terminal 1 that is the packet remaining amount request source.

  The packet remaining amount measuring unit 108 stores information related to the charge plan of the communication service of the communication packet network 3 to which the user is subscribed and the charging target period. The packet remaining amount measuring unit 108 monitors communication packets transmitted to and received from the communication packet network 3 via the communication packet network interface unit 100, and charges for communication services of the communication packet network 3 to which the user is subscribed. By using the packet amount M that can be used at the flat rate specified in the plan and the communication packet usage amount C from the start date of the unfinished billing period, this flat rate will be used before the end date of the billing period. The available packet remaining amount (= M−C) is measured.

  The main control unit 109 comprehensively controls each unit 100 to 108 of the own wireless telephone terminal 1. Further, the main control unit 109 performs a joining process and a leaving process of the own wireless telephone terminal 1 with respect to the extension telephone system. Further, the main control unit 109 includes a setting unit 1091, an acquisition necessity determination unit 1092, a switchability determination unit 1093, and a determination unit 1094.

  The setting unit 1091 enables / disables the call control server function so that only one of the radio telephone terminals 1 subscribing to the extension telephone system functions as the call control server. Set.

  The acquisition necessity determination unit 1092 causes the packet remaining amount measuring unit 108 to periodically measure the remaining packet amount when the call control server function of the own wireless telephone terminal 1 is set to be effective by the setting unit 1091. By checking whether or not the remaining amount of the packet has dropped below a predetermined reference value (for example, a value corresponding to a standard daily packet usage amount), another wireless telephone terminal 1 subscribing to the extension telephone system is checked. It is determined whether or not it is necessary to acquire the remaining packet amount from each.

  The switchability determination unit 1093 determines that the acquisition necessity determination unit 1092 determines that it is necessary to acquire the remaining amount of packets from each of the other radiotelephone terminals 1 subscribing to the extension telephone system. A packet remaining amount request is transmitted to each of the other wireless telephone terminals 1 subscribing to the extension telephone system, and the remaining packet amount is acquired from these wireless telephone terminals 1. Then, the wireless telephone terminal 1 that makes the call control server function effective by comparing the remaining packet amount of each of the other wireless telephone terminals 1 subscribing to the extension telephone system with the remaining packet amount of the own wireless telephone terminal 1. It is determined whether or not switching is possible.

  When the switchability determination unit 1093 determines that the radio telephone terminal 1 that enables the call control server function can be switched, the determination unit 1094 determines each of the other radio telephone terminals 1 that are subscribed to the extension telephone system. Based on the remaining amount of packet, a new radio telephone terminal 1 that activates the call control server function is determined from these radio telephone terminals 1.

  FIG. 6 is a flowchart for explaining the operation of the radio telephone terminal 1. This flow starts when the power of the wireless telephone terminal 1 is turned on and the wireless telephone terminal 1 is not subscribed to the extension telephone system.

  When the main control unit 109 accepts an extension joining operation from the user via the man-machine interface unit 101 while the own radiotelephone terminal 1 is disconnected from the extension telephone system (YES in S1), the main control unit 109 performs an extension joining process described later. (S2), the own wireless telephone terminal 1 is subscribed to the extension telephone system. Then, the main control unit 109 monitors whether or not the call control server function of the own radiotelephone terminal 1 is enabled while the own radiotelephone terminal 1 is subscribed to the extension telephone system (S3). If valid (YES at S3), various setting / call control server stop processing described below is performed (S4). If invalid (NO at S3), various settings / Call control server activation processing is performed (S5).

  When the main control unit 109 accepts an extension disconnection operation from the user via the man-machine interface unit 101 while the own wireless telephone terminal 1 is subscribed to the extension telephone system (YES in S6), the main control unit 109 performs an extension disconnection process described later. (S7), the own radiotelephone terminal 1 is detached from the extension telephone system.

  FIG. 7 is a flowchart for explaining the extension joining process S2 shown in FIG.

  First, the main control unit 109 instructs the PN communication unit 104 to participate in a private network under the VPN router 2. Receiving this, the PN communication unit 104 controls the VPN connection unit 103 to connect the own wireless telephone terminal 1 to the VPN router 2 via VPN (S201). As a result, the own wireless telephone terminal 1 is allowed to participate in the private network under the VPN router 2.

  Next, the PN communication unit 104 broadcasts an attribution request to the private network under the VPN router 2 via the VPN connection unit 103 (S202). If the attribution permission notification, which is a response to the attribution request, has not been received within the predetermined time (NO in S203), if the attribution request has not been transmitted a predetermined number of times (NO in S204), the process returns to S202 to request the attribution Will be broadcast again.

  On the other hand, in S203, when the attribution permission notification that is a response to the attribution request is received within a predetermined time (YES in S203), the PN communication unit 104 notifies the main control unit 109 of the transmission source address of the attribution permission notification. In response to this, the main control unit 109 notifies the IP telephone processing unit 105 of the transmission source address of the attribution permission notification and instructs to join the extension telephone system.

  When the registration request unit 1051 of the IP telephone processing unit 105 is instructed by the main control unit 109 to join the extension telephone system, the registration request unit 1051 uses the source address of the attribution permission notification received from the main control unit 109 as the call control server (call control server). Register as the address of the wireless telephone terminal 1) for which the server function is valid. The registration request unit 1051 transmits a registration request including the extension number, address, and user information of the own radio telephone terminal 1 to the radio telephone terminal 1 specified by the address of the call control server via the PN communication unit 104. (S205). Then, an update notification is received from the wireless telephone terminal 1, terminal information is read from the received update notification, and this terminal information is registered as terminal information of each wireless telephone terminal 1 subscribing to the extension telephone system. Thereby, the setting of the own wireless telephone terminal 1 as an extension telephone is completed (S206).

  Next, the state reflection unit 1052 of the IP telephone processing unit 105 receives the state notification from the wireless telephone terminal 1 that is the transmission source of the update notification, and sets the call control state included in this state notification to the own wireless telephone terminal 1. Reflect (S207). For example, if the call control state included in the state notification is standby, the standby state is displayed on the display of the man-machine interface unit 101, and the state of the own wireless telephone terminal 1 is shifted to standby. Let If the call control state included in the state notification is an incoming call, the speaker of the man-machine interface unit 101 rings and the incoming call is displayed on the display of the man-machine interface unit 101. The state of the terminal 1 is shifted during the incoming call. If the call control state included in the state notification is during a call, the state of the own radiotelephone terminal 1 is displayed during a call by displaying on the display of the man-machine interface unit 101 that the call is in progress. Transition. If the call control state included in the state notification is on hold, the state of the own radiotelephone terminal 1 is put on hold by displaying on the display of the man-machine interface unit 101 that the call is on hold. Transition.

  In S204, when the attribution request is transmitted a predetermined number of times (YES in S204), the PN communication unit 104 notifies the main control unit 109 of a timeout for receiving the attribution permission notification. In response to this, the setting unit 1091 of the main control unit 109 enables the call control server function of the own radiotelephone terminal 1 (S208), and activates the call control server processing unit 106.

  When activated by the setting unit 1091, the call control server processing unit 106 first sends a registration request including the external line number of the extension telephone system and the address of the own wireless telephone terminal 1 to the IP telephone via the IP telephone network communication unit 102. It transmits to the network 4 (specifically, a call control server (not shown) on the IP telephone network 4), and registers its own radio telephone terminal 1 in the IP telephone network 4 (S209).

  Next, the call control server processing unit 106 broadcasts a server activation notification to the private network under the VPN router 2 via the PN communication unit 104 (S210), and the VPN until the predetermined time elapses. It waits for a registration request sent from the wireless telephone terminal 1 participating in the private network under the router 2. However, when the call control server function of the own wireless telephone terminal 1 is validated when the extension is subscribed, the own wireless telephone terminal 1 is the only wireless telephone terminal 1 participating in the private network under the VPN router 2. Therefore, no registration request is sent. In this case, the call control server processing unit 106 registers only the terminal information of the own wireless telephone terminal 1 as terminal information for call control (S211). As a result, information necessary for call control of the own radiotelephone terminal 1 is set in the call control server processing unit 106.

  Then, the call control server processing unit 106 registers the address of the own radiotelephone terminal 1 in the IP telephone processing unit 105 as the address of the call control server, and the call control target registered in the call control server processing unit 106 ( The terminal information of the own wireless telephone terminal 1) is registered. Thereby, the setting of the own wireless telephone terminal 1 as the extension telephone is completed (S212).

  FIG. 8 is a flowchart for explaining the various setting / call control server stop processing S4 shown in FIG.

  The acquisition necessity determination unit 1092 of the main control unit 109 instructs the packet remaining amount measurement unit 108 to measure the remaining packet amount when the packet remaining amount acquisition necessity determination timing arrives periodically (YES in S401). . In response to this, the packet remaining amount measuring unit 108 receives the packet amount M that can be used at a flat rate by the communication service of the communication packet network 3 to which the user has subscribed, and the unfinished charging target in the communication packet network interface unit 100. Using the communication packet usage C from the start date of the period, the remaining amount of packet (= M−C) that can be used up to the end date of the chargeable period is measured at this fixed rate, and it is determined whether acquisition is necessary. Part 1092. The acquisition necessity determination unit 1092 then determines whether or not the packet remaining amount received from the packet remaining amount measuring unit 108 has decreased below a predetermined reference value (for example, a value corresponding to a standard daily packet usage amount). (S402). If the remaining amount of the packet drops below the reference value (YES in S402), the acquisition necessity determination unit 1092 instructs the switchability determination unit 1093 of the main control unit 109 to determine whether the call control server can be switched.

  In response to this, the switchability determination unit 1093 receives, via the PN communication unit 104, another wireless telephone terminal 1 (terminal information registered in the call control server processing unit 106) that is subscribed to the extension telephone system. A packet remaining amount request is transmitted to each of the wireless telephone terminals 1) excluding the wireless telephone terminal 1-1 (S403). Here, the packet remaining amount request may be broadcast to the private network under the VPN router 2. Then, the switchability determination unit 1093 receives a packet remaining amount notification from these wireless telephone terminals 1 via the PN communication unit 104 (S404), and determines whether the call control server can be switched (S405). Specifically, the call control server is switched when at least one of the remaining amount of packets received from other wireless telephone terminals 1 that are subscribed to the extension telephone system is larger than the remaining amount of packets of the own wireless telephone terminal 1. The call control server cannot be switched when the remaining packet amount received from another wireless telephone terminal 1 that is subscribed to the extension telephone system is smaller than the remaining packet amount of the own wireless telephone terminal 1 Judge. If switchability determination unit 1093 determines that the call control server can be switched (YES in S406), main control unit 109 determines the remaining packet amount of each of the other radiotelephone terminals 1 that are subscribed to the extension telephone system. To the determination unit 1094.

  In response, the determination unit 1094 determines a spare server from among the other radio telephone terminals 1 that are subscribed to the extension telephone system, based on the remaining packet amount received from the switchability determination unit 1093 (S407). Specifically, the wireless telephone terminal 1 having the largest remaining packet amount is determined as a spare server among the other wireless telephone terminals 1 that are subscribed to the extension telephone system.

  Next, the determination unit 1094 transmits a backup server request to the wireless telephone terminal 1 determined as the backup server via the PN communication unit 104 (S408). If the determination unit 1094 receives a backup server response from the wireless telephone terminal 1 via the PN communication unit 104 (S409), the call control is performed to cancel the registration of the own wireless telephone terminal 1 from the IP telephone network 4. The server processing unit 106 is instructed. In response to this instruction, the call control server processing unit 106 makes an extension telephone call to the IP telephone network 4 (specifically, a call control server (not shown) on the IP telephone network 4) via the IP telephone network communication unit 102. A registration cancellation request including the system outside line number and the address of the own radio telephone terminal 1 is transmitted to deregister the own radio telephone terminal 1 from the IP telephone network 4 (S410). When receiving the registration cancellation notification from the IP telephone network 4, the call control server processing unit 106 stops its operation and instructs the setting unit 1091 of the main control unit 109 to disable the call control server function of the own radiotelephone terminal 1. . In response to this, the setting unit 1091 sets the call control server function of the own wireless telephone terminal 1 to be invalid (S411). Then, the call control server processing unit 106 transmits a server stop notification to each of the other radio telephone terminals 1 that are subscribed to the extension telephone system via the PN communication unit 104 (S412). Here, the server stop notification may be broadcast to the private network under the VPN router 2.

  If the setting unit 1091 receives an attribution request from another wireless telephone terminal 1 via the PN communication unit 104 while the call control server processing unit 106 is operating (YES in S413), the setting unit 1091 sets the attribution request transmission source. An attribution permission notification is transmitted (S414). Next, when receiving a registration request from the source of the attribution request, the call control server processing unit 106 registers the extension number, address, and user information included in the registration request as terminal information for call control (S415). ). As a result, information necessary for call control of the transmission source of the registration request is set in the call control server processing unit 106. Further, the call control server processing unit 106 uses the terminal information of the call control target additionally registered in the call control server processing unit 106 as the terminal information of the radio telephone terminal 1 newly subscribed to the extension telephone system. Register with. Thereby, the setting of the extension telephone of the own wireless telephone terminal 1 is updated (S416).

  Next, the call control server processing unit 106 transmits an update notification including the terminal information of each call control target registered in the call control server processing unit 106 to the transmission source of the registration request via the PN communication unit 104. . Further, the call control state notification unit 1061 of the call control server processing unit 106 transmits a state notification including the call control state of the call control server processing unit 106 to the transmission source of the registration request via the PN communication unit 104 (S417). ).

  In addition, when the call control server processing unit 106 receives a disconnection request from another wireless telephone terminal 1 via the PN communication unit 104 (YES in S487), the call control target registered in the call control server processing unit 106 Terminal information of the source of the withdrawal request is deleted from the terminal information (S419). In addition, the call control server processing unit 106 sends the call control target terminals to each of the call control target radio telephone terminals 1 whose terminal information is registered in the call control server processing unit 106 via the PN communication unit 104. The update notification including the information is transmitted, and the terminal information of the transmission source of the withdrawal request is deleted from the terminal information of the wireless telephone terminal 1 registered in the IP telephone processing unit 105, and the extension telephone set in the own wireless telephone terminal 1 is set Is updated (S420).

  FIG. 9 is a flowchart for explaining the various setting / call control server activation processing S5 shown in FIG.

  When the packet remaining amount notifying unit 107 receives the packet remaining amount request via the PN communication unit 104 (YES in S501), the packet remaining amount notifying unit 107 instructs the packet remaining amount measuring unit 108 to measure the packet remaining amount. In response to this, the packet remaining amount measuring unit 108 receives the packet amount M that can be used at a fixed charge by the communication service of the communication packet network 3 to which the user has subscribed, and the unfinished charge in the communication packet network interface unit 100. Using the communication packet usage C from the start date of the target period, the remaining amount of packet (= M−C) that can be used up to the end date of the charge target period is measured at this fixed rate, and this is used as the remaining packet amount. The data is passed to the notification unit 107 (S502). The packet remaining amount notification unit 107 transmits a packet remaining amount notification including the packet remaining amount received from the packet remaining amount measuring unit 108 to the transmission source of the packet remaining amount request via the PN communication unit 104 (S503).

  When the IP telephone processing unit 105 receives the update notification via the PN communication unit 104 (YES in S504), the terminal information of each wireless telephone terminal 1 that is subscribed to the extension telephone system registered in the IP telephone processing unit 105 Is changed to the terminal information of each wireless telephone terminal 1 included in the update notification. Thereby, the setting of the own wireless telephone terminal 1 as the extension telephone is updated (S505).

  Further, when receiving the server activation notification via the PN communication unit 104 (YES in S506), the IP telephone processing unit 105 registers the transmission source of the server activation notification as a new call control server of the extension telephone system. In response to this, the registration request unit 1051 of the IP telephone processing unit 105 transmits a registration request including the extension number, address, and user information of the own wireless telephone terminal 1 to the transmission source of the server activation notification (S507).

  In addition, when the setting unit 1091 of the main control unit 109 receives the spare server request via the PN communication unit 104 (YES in S508), the setting unit 1091 sets the own wireless telephone terminal 1 as a spare server and also via the PN communication unit 104. Then, a spare server response is transmitted to the transmission source of the spare server request (S509). Thereafter, the setting unit 1091 waits for a server stop notification sent from the transmission source of the spare server request (S510).

  Next, when the setting unit 1091 receives a server stop notification from the transmission source of the backup server request via the PN communication unit 104 (YES in S510), the setting unit 1091 sets the call control server function to be valid (S511), and the call control server The processing unit 106 is activated.

  When activated by the setting unit 1091, the call control server processing unit 106 first sends a registration request including the external line number of the extension telephone system and the address of the own wireless telephone terminal 1 to the IP telephone via the IP telephone network communication unit 102. The data is transmitted to the network 4 (specifically, a call control server (not shown) on the IP telephone network 4), and the own wireless telephone terminal 1 is registered in the IP telephone network 4 (S512).

  Next, the call control server processing unit 106 broadcasts a server activation notification to the private network under the VPN router 2 via the PN communication unit 104 (S513), and the VPN until the predetermined time elapses. It waits for a registration request sent from the wireless telephone terminal 1 participating in the private network under the router 2. Then, the extension number, address, and user information included in each registration request received within the predetermined time are registered together with the terminal information of the own radiotelephone terminal 1 as terminal information for call control (S514). As a result, information necessary for call control of each radiotelephone terminal 1 subscribing to the extension telephone system is set in the call control server processing unit 106.

  Then, the call control server processing unit 106 transmits an update notification including the terminal information of each call control target registered in the call control server processing unit 106 to the transmission source of each registration request via the PN communication unit 104. In addition, the address of the own radiotelephone terminal 1 is registered in the IP telephone processing unit 105 as the address of the call control server, and the terminal information of each call control registered in the call control server processing unit 106 is stored in the extension telephone system. It registers as terminal information of each wireless telephone terminal 1 that is subscribed. Thereby, the setting of the own wireless telephone terminal 1 as the extension telephone is completed (S515).

  FIG. 10 is a flowchart for explaining the extension departure processing S7 shown in FIG.

  First, the determination unit 1094 of the main control unit 109 determines whether or not the call control server function of the own radiotelephone terminal 1 is enabled by the setting unit 1091 of the main control unit 109, that is, the call control server processing unit 106 It is determined whether it is in operation (S701).

  When the call control server function of the own wireless telephone terminal 1 is set to be valid (YES in S701), the determination unit 1094 receives another wireless telephone terminal 1 subscribing to the extension telephone system via the PN communication unit 104. A packet remaining amount request is transmitted to each (S702). Here, the packet remaining amount request may be broadcast to the private network under the VPN router 2. Then, the determination unit 1094 receives a packet remaining amount notification from these wireless telephone terminals 1 via the PN communication unit 104 (S703), and determines a spare server (S704). Specifically, the wireless telephone terminal 1 having the largest remaining packet amount is determined as a spare server among the other wireless telephone terminals 1 that are subscribed to the extension telephone system.

  Next, the determination unit 1094 transmits a backup server request to the wireless telephone terminal 1 determined as the backup server via the PN communication unit 104 (S705). If the determination unit 1094 receives a backup server response from the wireless telephone terminal 1 via the PN communication unit 104 (S706), the call control is performed to cancel the registration of the own wireless telephone terminal 1 from the IP telephone network 4. The server processing unit 106 is instructed. In response to this instruction, the call control server processing unit 106 makes an extension telephone call to the IP telephone network 4 (specifically, a call control server (not shown) on the IP telephone network 4) via the IP telephone network communication unit 102. A registration cancellation request including the system outside line number and the address of the own radio telephone terminal 1 is transmitted to deregister the own radio telephone terminal 1 from the IP telephone network 4 (S707). When receiving the registration cancellation notification from the IP telephone network 4, the call control server processing unit 106 stops its operation and instructs the setting unit 1091 of the main control unit 109 to disable the call control server function of the own radiotelephone terminal 1. . In response, the setting unit 1091 sets the call control server function to invalid (S708). Then, the call control server processing unit 106 transmits a server stop notification to each of the other radio telephone terminals 1 that are subscribed to the extension telephone system via the PN communication unit 104 (S709). Here, the server stop notification may be broadcast to the private network under the VPN router 2.

  Next, the setting unit 1091 instructs the PN communication unit 104 to leave the private network under the VPN router 2. In response to this, the PN communication unit 104 controls the VPN connection unit 103 to disconnect the VPN connection with the VPN router 2 (S710). As a result, the own wireless telephone terminal 1 is detached from the extension telephone system.

  On the other hand, when the call control server function of the own wireless telephone terminal 1 is set to be invalid (NO in S701), the setting unit 1091 instructs the IP telephone processing unit 105 to leave the extension telephone system. In response to this, the IP telephone processing unit 105 leaves the wireless telephone terminal 1 registered as a call control server via the PN communication unit 104 including the extension number, address, and user information of the own wireless telephone terminal 1. A request is transmitted (S711). Thereafter, the setting unit 1091 instructs the PN communication unit 104 to leave the private network under the VPN router 2. Receiving this, the PN communication unit 104 controls the VPN connection unit 103 and disconnects the VPN connection with the VPN router 2 (S712). As a result, the own wireless telephone terminal 1 is detached from the extension telephone system.

  The embodiment of the present invention has been described above.

  According to the present embodiment, a plurality of wireless telephone terminals 1 having a call control server function are respectively connected to the VPN router 2 by VPN connection so that these wireless telephone terminals 1 participate in the same private network. Among the telephone terminals 1, any one of the wireless telephone terminals 1 with the call control server function enabled can perform call control of these wireless telephone terminals 1. For this reason, even when a plurality of wireless telephone terminals 1 are dispersed at geographically separated positions via the communication packet network 3, these wireless telephone terminals 1 can be used without specially installing a call control server. The extension telephone system that was used can be constructed.

  In addition, according to the present embodiment, call control is performed using the remaining amount of packet that can be used by the end of the billing period that has not been terminated for a fixed amount by the communication service of the communication packet network 3 to which the user has subscribed. Since the wireless telephone terminal 1 that activates the server function is determined, the wireless telephone terminal 1 that activates the call control server function is switched so that the usage fee of the communication packet network 3 of each wireless telephone terminal 1 falls within the flat fee. be able to. Therefore, the call cost of the extension telephone system as a whole can be suppressed.

  Further, according to the present embodiment, the wireless telephone terminal 1 uses the communication packet network 3 to which the user has subscribed, and the remaining amount of packet that can be used at a fixed charge before the end date of the accounting period that has not been completed. When this packet remaining amount becomes a predetermined reference value or less, the remaining packet amount is obtained from the other wireless telephone terminals 1 constituting the extension telephone system, and it is determined whether or not the call control server can be switched. ing. Therefore, the exchange between the radio telephone terminals 1 for determining whether or not the call control server can be switched can be suppressed to the minimum necessary, thereby further reducing the call cost of the extension telephone system as a whole.

  In addition, this invention is not limited to said embodiment, Many deformation | transformation are possible within the range of the summary.

  For example, in the above-described embodiment, the call control server uses the remaining packet amount of each radiotelephone terminal 1 that can be used by the communication service of the communication packet network 3 until the end date of the accounting target period that has not been completed for a flat fee. The wireless telephone terminal 1 that activates the function is determined. However, the present invention is not limited to this. In the present invention, the packet consumption data of each radiotelephone terminal 1 specified by the packet amount M that can be used at a flat rate by the communication service of the communication packet network 3 and the packet usage amount C from the start date of the accounting period that has not been completed. What is necessary is just to judge the radio telephone terminal 1 which validates a call control server function.

  That is, when the call control server function of the own radiotelephone terminal 1 is set to be effective and the packet consumption data of the own radiotelephone terminal 1 falls below a predetermined reference value, the radiotelephone terminal 1 It is determined that there is a need for acquisition, and packet consumption data is acquired from each of the other radiotelephone terminals 1 constituting the extension telephone system. Then, if there is a wireless telephone terminal 1 with packet consumption data larger than that of the own wireless telephone terminal 1 among the other wireless telephone terminals 1 constituting the extension telephone system, it is determined that the call control server can be switched, The wireless telephone terminal 1 with large packet consumption data is determined as a spare server.

  Here, as the packet consumption data other than the remaining amount of packet, the packet remaining amount divided by the number of days N until the end date of the accounting target period (M−C) / N, a packet that can be used at a flat rate There is a remaining packet ratio (M−C) / M indicating the ratio of the remaining packet to the amount M.

  In the above-described embodiment, any one of the wireless telephone terminals 1 subscribing to the extension telephone system is connected to the IP telephone network 4 with the call control server function enabled, so that it is subscribing to the extension telephone system. All of the wireless telephone terminals 1 can make an external line call by IP telephone. However, the present invention is not limited to this. According to the present invention, any one of the radio telephone terminals 1 subscribing to the extension telephone system is connected to the telephone network by enabling the call control server function, whereby all the radio telephone terminals 1 subscribing to the extension telephone system are connected. As long as it is possible to make an outside line call. For example, the radio telephone terminal 1 in which the call control server function is set to be effective may be connected to a mobile telephone network instead of the IP telephone network 4, or may be connected to a PHS network.

  In the above embodiment, the specific wireless telephone terminal 1 may have the function of the VPN router 2.

  In the above embodiment, the functional configuration of the radio telephone terminal 1 shown in FIG. 5 is realized by an integrated logic IC such as ASIC (Application Specific Integrated Circuit) or FPGA (Field Programmable Gate Array). Alternatively, it may be realized by software by a computer such as a DSP (Digital Signal Processor). Or, in a general-purpose computer such as a PC (Personal Computer), a PDA (Personal Digital Assistant), or a smart phone equipped with an auxiliary storage device such as a CPU, memory, HDD, DVD-ROM, and wireless communication device such as a wireless LAN adapter, It may be realized by the CPU loading a predetermined program from the auxiliary storage device onto the memory and executing it.

  DESCRIPTION OF SYMBOLS 1, 1-1 to 1-3: Wireless telephone terminal, 2: VPN router, 3: Communication packet network, 4: IP telephone network, 100: Communication packet network interface part, 101: Man machine interface part, 102: IP telephone Network communication unit 103: VPN connection unit 104: PN communication unit 105: IP telephone processing unit 106: Call control server processing unit 107: Remaining packet notification unit 108: Remaining packet measurement unit 109: Main Control unit, 1051: registration request unit, 1052: status reflection unit, 1061: call control status notification unit, 1091: setting unit, 1092: acquisition necessity determination unit, 1093: switchability determination unit, 1094: determination unit

Claims (5)

A wireless telephone terminal having a call control server function,
VPN connection means for performing VPN connection, which is a connection form limited between predetermined addresses via a communication packet network,
Communication means for communicating with another wireless telephone terminals connected the same private network and the radio telephone terminal via the VPN connection,
Validity / invalidity of the call control server function of its own radiotelephone terminal so that only one of the radiotelephone terminals connected to the private network activates the call control server function A setting means for setting
Call control server means for performing call control of each wireless telephone terminal connected to the private network when the call control server function of the own wireless telephone terminal is set to be valid;
When the call control server function of the own radiotelephone terminal is set to be valid, the amount of packets that can be used at a flat rate by the communication service of the communication packet network used by the own radiotelephone terminal and the start date of the chargeable period Wirelessly connected to the private network based on the packet consumption data specified by the packet usage from and the packet consumption data acquired from each of the other wireless telephone terminals connected to the private network Determining means for determining a radiotelephone terminal that activates the call control server function from among the telephone terminals;
The setting means includes
When the call control server function of the own wireless telephone terminal is set to be valid, the wireless means for enabling the other wireless telephone terminal connected to the private network to enable the call control server function by the determining means If determined to be a telephone terminal, request the activation of the call control server function to the other radio telephone terminal, set the call control server function of its own radio telephone terminal to invalid,
When the call control server function of the own wireless telephone terminal is set to invalid, the activation of the call control server function of the own wireless telephone terminal is requested by another wireless telephone terminal connected to the private network. If so, the call control server function of the own radiotelephone terminal is set to be valid. The wireless telephone terminal according to claim 1, wherein
When the call control server function of the own radiotelephone terminal is set to be effective, the amount of packets that can be used at the flat rate by the communication service of the communication packet network used by the own radiotelephone terminal and the start of the chargeable period Based on the packet consumption data specified by the packet usage from the day, acquisition necessity determination means for determining whether or not to acquire the packet consumption data of each of the other wireless telephone terminals connected to the private network,
When the call control server function of the own radiotelephone terminal is set to be effective, if it is determined by the acquisition necessity determination means that the acquisition of the packet consumption data is necessary, it is connected to the private network. Radio that enables the call control server function to acquire the packet consumption data from each of the other radio telephone terminals and to enable the call control server function based on the packet consumption data of each of the other radio telephone terminals and the packet consumption data of the own radio telephone terminal A switchability determination means for determining whether a telephone terminal can be switched;
When the call control server function of the own wireless telephone terminal is set to be invalid, the packet consumption data of the own wireless telephone terminal is obtained in accordance with a request from another wireless telephone terminal that enables the call control server function. A notification means for notifying the other wireless telephone terminal;
The determining means includes
When the call control server function of the own radiotelephone terminal is set to be effective, if the radiophone terminal that enables the call control server function is determined to be switchable by the switchability determination unit, Based on the packet consumption data acquired from each of the other wireless telephone terminals connected to the private network, the call control server function is enabled from the other wireless telephone terminals connected to the private network. A wireless telephone terminal characterized by determining a new wireless telephone terminal. The wireless telephone terminal according to claim 2, wherein
The packet consumption data is
By the communication service of the communication packet network used by the own wireless telephone terminal, the remaining amount of the packet that can be used at the fixed amount by the end date of the chargeable period, the remaining amount of the packet is the number of days until the end date of the chargeable period. The divided daily packet remaining amount, or the packet remaining amount ratio indicating the ratio of the remaining packet amount to the packet amount that can be used at the flat rate,
The acquisition necessity determination means includes
When the packet consumption data of the own wireless telephone terminal is equal to or less than a predetermined value, it is determined that the acquisition of the packet consumption data from another wireless telephone terminal connected to the private network is necessary,
The switchability determination means is
A wireless telephone terminal that activates the call control server function when there is a wireless telephone terminal whose packet consumption data is larger than that of its own wireless telephone terminal among other wireless telephone terminals connected to the private network Switching is possible,
The determining means includes
Of the other wireless telephone terminals connected to the private network, the wireless telephone terminal with the largest packet consumption data is determined as a new wireless telephone terminal that enables the call control server function. Wireless phone terminal. A computer-readable program having an interface with a communication packet network,
The program is
Causing the computer to function as a wireless telephone terminal having a call control server function;
The wireless telephone terminal
VPN connection means for performing VPN connection, which is a connection form limited between predetermined addresses via a communication packet network,
Communication means for communicating with another wireless telephone terminals connected the same private network and the radio telephone terminal via the VPN connection,
Validity / invalidity of the call control server function of its own radiotelephone terminal so that only one of the radiotelephone terminals connected to the private network activates the call control server function A setting means for setting
Call control server means for performing call control of each wireless telephone terminal connected to the private network when the call control server function of the own wireless telephone terminal is set to be valid;
When the call control server function of the own radiotelephone terminal is set to be valid, the amount of packets that can be used at a flat rate by the communication service of the communication packet network used by the own radiotelephone terminal and the start date of the chargeable period Wirelessly connected to the private network based on the packet consumption data specified by the packet usage from and the packet consumption data acquired from each of the other wireless telephone terminals connected to the private network Determining means for determining a radiotelephone terminal that activates the call control server function from among the telephone terminals;
The setting means includes
When the call control server function of the own wireless telephone terminal is set to be valid, the wireless means for enabling the other wireless telephone terminal connected to the private network to enable the call control server function by the determining means If determined to be a telephone terminal, request the activation of the call control server function to the other radio telephone terminal, set the call control server function of its own radio telephone terminal to invalid,
When the call control server function of the own wireless telephone terminal is set to invalid, the activation of the call control server function of the own wireless telephone terminal is requested by another wireless telephone terminal connected to the private network. If so, a program for enabling the call control server function of its own radiotelephone terminal. A method of constructing an extension telephone system using a plurality of wireless telephone terminals,
A call control server function is installed in the plurality of wireless telephone terminals,
Connecting the plurality of wireless telephone terminals to the same private network via a VPN connection which is a connection form limited between specific addresses in a communication packet network;
Using the packet consumption data of each of the plurality of radiotelephone terminals specified by the amount of packets that can be used at a flat rate by the communication service of the communication packet network and the amount of packets used from the start date of the charging target period, From the wireless telephone terminals, determine the wireless telephone terminal that enables the call control server function,
Of the plurality of wireless telephone terminals, the wireless telephone terminal that is determined as the wireless telephone terminal that enables the call control server function is enabled, and only the call control server function is enabled. A method for constructing an extension telephone system, comprising: causing a telephone terminal to perform call control of the plurality of wireless telephone terminals connected to the private network.

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