JP4536056B2 - Telephone switching system that automatically configures transfer changes - Google Patents

Description

  The present invention relates to a telephone exchange system such as a button telephone apparatus or a private branch exchange that uses a wireless terminal that accesses a wireless LAN (local area network) and a wired fixed telephone as an extension. The present invention relates to a telephone exchange system for automatically setting a transfer change when a dual-mode mobile phone that can access a wireless LAN and a mobile phone network is used as a terminal.

  As a conventional telephone exchange system for automatically setting a transfer change, for example, there is a radio telephone transfer setting system disclosed in Japanese Patent Laid-Open No. 2-312494 (Patent Document 1, FIG. 1). In this Patent Document 1, in a private branch exchange, a mobile phone and a wired phone used together have different phone numbers, and the mobile phone charger is set / reset or based on the presence / absence of the set / reset. If there is an incoming call to the mobile phone, the call is automatically transferred to the wired phone, and if the mobile phone is not in a fixed position, the incoming call to the mobile phone is automatically transferred to the mobile phone. .

  In the telephone exchange system disclosed in Patent Document 1, the mobile phone and the wired phone function only as an extension telephone, and the mobile phone is limited to short-distance communication such as in a business office. However, at present, mobile phones connected to a mobile phone network by public communication carriers are widely used by individuals. Therefore, it is necessary to transfer each incoming call to each other party in a system using a mobile phone connected to the mobile phone network.

  An example of such a telephone exchange system is Japanese Patent Application Laid-Open No. 2004-32356 (Patent Document 2, FIG. 3). In this Patent Document 2, a mobile phone is electrically connected directly to a fixed phone that is wired to a fixed telephone network or a private branch exchange. Therefore, the fixed telephone connected to the fixed telephone network detects whether or not the mobile telephone is connected, and in the connected state, the mobile phone network is set to forward incoming calls to the fixed telephone, and fixed in the non-connected state. The fixed telephone network is set to forward incoming calls to the mobile phone. In addition, when a fixed telephone is connected to a private branch exchange, the private branch exchange can change transfer settings.

  However, the telephone exchange system according to Patent Document 2 requires modification to connect a mobile phone to a fixed telephone. Furthermore, when a fixed telephone is connected to a private branch exchange, when a mobile telephone disconnected from the fixed telephone is used in the local area, the communication path passes through the mobile telephone network. Therefore, when making a call with the extension telephone of the private branch exchange using the mobile phone, a charge burden is required because the call path goes through the mobile phone network.

  In order to avoid this problem, a dual-mode wireless terminal is recently used in which both wireless devices for near-premise distance and public telephone network are mounted on mobile phones. That is, it is usually a mobile phone mode for accessing the public network. On the other hand, when used as an extension, it is possible to access a wireless LAN (local area network) of a private branch exchange for a short distance and switch to a wireless LAN mode that can be directly connected to another extension via the private branch exchange.

  The switching of the communication mode is disclosed in, for example, a multimode wireless communication apparatus disclosed in Japanese Patent Application Laid-Open No. 2004-201272 (Patent Document 3). In Patent Document 3, a control unit is provided that periodically operates a wireless unit in a cellular phone mode and switches to a wireless LAN mode after a predetermined time. This control unit determines whether or not to continue the communication in the cellular phone mode by suppressing the switching to the wireless LAN mode when the radio unit detects the occurrence of the incoming call event during standby reception in the cellular phone mode. Is determined. Therefore, in this patent document 3, even if an access state with the wireless LAN occurs, the wireless communication apparatus cannot immediately follow the mode, so that a quick automatic setting for transfer cannot be performed.

  Furthermore, for example, a mobile communication device disclosed in Japanese Patent Application Laid-Open No. 11-275272 (Patent Document 4) discloses a multi-mode mobile phone that can be used by appropriately switching between a plurality of communication methods. That is, when the telephone number of the other party is input from the keypad, the control unit specifies the communication system of the other party from the input telephone number and database, and selects a currently usable communication system. Then, calculate the call charge per unit time when making a call to each currently available communication method, and use the communication method with the lowest call charge based on the calculation result A communication method is selected.

  According to Patent Document 4, when a mobile phone is a dual-mode wireless terminal for short-distance use and public use and is in a wireless LAN area of a private branch exchange, it automatically becomes a wireless LAN terminal when a call is made. Can work. Therefore, this dual-mode mobile phone can be applied to Patent Document 1 and Patent Document 2 described above. Thereby, the call from the mobile phone becomes economical.

  However, Patent Literature 3 or Patent Literature 4 is about a dual-mode wireless terminal unit and discloses mode selection in the wireless terminal. However, in the telephone exchange system, the transfer destination is determined according to the mode conversion of the wireless terminal. Is not set. That is, it is a control in the wireless terminal, and cannot control an incoming call to the dual-mode wireless terminal.

  That is, in a configuration in which a mobile phone is used in conjunction with or linked to a fixed phone, a telephone switching system having a wireless LAN can connect an extension to a fixed phone when the dual-mode wireless terminal mobile phone goes out of the wireless LAN area. There is no disclosure of a technology for automatically setting an incoming call to be transferred to a mobile phone that is linked to an out-of-service area.

Japanese Unexamined Patent Publication No. 2-312494 (FIG. 1) Japanese Patent Laying-Open No. 2004-32356 (FIG. 3) JP 2004-20272 A JP-A-11-275272

  The problem to be solved is that even if a telephone switching system having a wireless LAN (local area network) uses a dual-mode wireless terminal that can access the wireless LAN and the mobile phone network as a mobile phone, When a wireless terminal linked to a fixed telephone moves out of the wireless LAN range, it is not possible to automatically set up to transfer the incoming call to the linked fixed telephone to the linked wireless terminal.

  The present invention relates to a telephone exchange system such as a button telephone apparatus or a private branch exchange that uses a wireless terminal accessing a wireless LAN and a wired fixed telephone in conjunction with an extension number, and the wireless terminal includes a wireless LAN. And a dual-mode mobile phone that can access the public mobile phone network. Also, the main device in the key telephone device, equivalent to the exchange device, accommodates and connects at least one external line on one side and a plurality of the internal lines on the other side, and performs call connection control.

The main device according to the present invention, when the wireless terminal there is an incoming call to the wireless terminal when in distance of the wireless LAN, interlocking the incoming call to the wireless terminal to the wireless terminal If the wireless terminal is determined to be out of range of the wireless LAN when an incoming call is made to the fixed telephone that is linked to the wireless terminal , The main feature is that each control is performed so that an incoming call to the telephone is transferred to the wireless terminal via the public mobile telephone network.

  With this configuration, a user who owns a wireless terminal that is linked to an extension landline telephone can receive an incoming call with the extension wireless terminal number when the wireless terminal is accessing the wireless LAN. Since the call is made, it is possible to make a call with high quality by wire. On the other hand, when the wireless terminal cannot access the wireless LAN, the incoming call to the linked fixed line telephone and the wireless terminal calls the wireless terminal by the transfer destination number, so the transfer destination number is registered in the mobile phone network. In the case of a mobile phone number, a call can be made with the wireless terminal.

  The telephone switching system uses VoIP (Voice over Internet Protocol) for voice data communication so as to be accessible to the Internet, and uses SIP (Session Initiation Protocol) as the call control protocol. This is desirable because the call transfer service of the telephone network and the cellular phone network can be used.

  Specifically, the main device includes a wireless terminal setting table having information on a linked fixed telephone and a wireless LAN in-range / out-of-range entry corresponding to the wireless terminal accessing the wireless LAN, and a linked destination wireless terminal corresponding to the fixed telephone. Fixed telephone setting table having information of transfer setting status and transfer destination number list, and presence / absence of access to the wireless terminal via the wireless LAN, and setting the in-range / out-of-range entry to the wireless terminal setting If there is an entry registration means for recording in the table and a fixed telephone that is linked when the entry registration means records out-of-service in the wireless terminal setting table, the transfer setting state is set to transfer in the fixed telephone setting table And a fixed telephone that is linked when the entry registration unit records the area in the wireless terminal setting table. Comprises a means for canceling transfer setting of the transfer setting state by the fixed telephone set table.

  Further, the main apparatus has a transfer destination number list area in the wireless terminal setting table, and has a means for transferring an incoming call to an out-of-service wireless terminal without a linked fixed telephone according to the transfer destination number list. Can be provided.

Further, the main device, an incoming call to the wireless terminal when the wireless terminal there is an incoming call to have the wireless terminal within the wireless LAN to the fixed telephone linked to the wireless terminal when transferring the by providing a means for also call to the wireless terminal via the wireless LAN, even when the user holds the wireless LAN area of the wireless terminal is away from the vicinity of interlocking fixed telephone, the incoming call Can receive.

  In the telephone exchange system of the present invention, when a dual-mode wireless terminal is accommodated in an extension via a wireless LAN and an interlocking fixed telephone is set as the extension, a call is received from the public mobile phone network outside the wireless LAN area, while the wireless LAN In the area, the transfer change is automatically set so that the linked fixed telephone is called. For this reason, users who possess this wireless terminal can communicate via the public mobile phone network outside the wireless LAN area, and can communicate via a fixed telephone via a telephone exchange system within the wireless LAN, so that the user can use a stable cable. In addition to being able to obtain calls, wireless terminals can perform inter-line communication via a telephone exchange system, so that there is an effect that economics can be obtained.

  An object of the present invention is to provide a telephone exchange system, and even when a dual-mode wireless terminal that can access a wireless LAN and a mobile phone network is used as a mobile phone, a wireless terminal that works with a fixed telephone by extension is wireless. When moving out of the LAN area, it is possible to automatically enable a setting to transfer an incoming call to the linked fixed telephone to the linked wireless terminal.

  Therefore, when the main device in the key telephone device, which is equivalent to the exchange device, controls the call connection by accommodating and connecting at least one external line on one side and the plurality of extensions on the other side as the telephone main device. Processing control according to the invention.

  That is, if the telephone main unit has a fixed telephone to which the wireless terminal is linked when the wireless terminal is accessed via the wireless LAN, an incoming call to the wireless terminal is sent to the linked fixed telephone. When the wireless terminal has a fixed telephone that is linked when the wireless terminal is determined to be out of the wireless LAN range, the incoming call to the linked fixed telephone is transferred to the wireless terminal. The transfer change is automatically set to be transferred via the telephone network.

  Hereinafter, the embodiments will be described in detail with reference to the drawings. Since the drawings are limited, the constituent elements other than the parts according to the present invention may be omitted even if they are functions essential to the system or apparatus.

  Moreover, as long as the content shown and demonstrated satisfies the meaning and basic function of this invention, the change is free, and the following description does not limit this invention.

  A first embodiment of the present invention will be described with reference to FIG.

  FIG. 1 is an explanatory diagram showing in block form an embodiment of the telephone exchange system of the present invention.

  The illustrated telephone exchange system 1 includes a telephone main device 10, a fixed telephone 21, a radio base station 30, and a radio terminal 31, and uses SIP (Session Initiation Protocol) as a communication control protocol thereof. . The radio base station 30 serves as an access point for the radio terminal 31 connected via a radio line. The wireless terminal 31 has a so-called dual mode, and includes both a wireless LAN compatible short-range wireless device and a public mobile phone wireless device.

  The telephone main device 10 is, for example, a main device of a button telephone device, and accommodates and connects at least one external line on the one hand and a plurality of internal lines on the other hand to control call connection. It includes an external line IF (interface) unit 11, an external line call control unit 12, an external line transfer control unit 13, an internal line call control unit 14, a telephone IF unit 15, a wireless IF unit 16, a fixed telephone setting table 17, and a wireless terminal setting table. 18 is provided.

  The external line IF unit 11 is connected to the Internet on one side and to the external line call control unit 12 on the other side, performs mutual exchange of information, and uses VoIP (voice over Internet protocol) for transmission and reception of voice data. Shall. In particular, as the call control protocol, SIP that has become popular and has recently become popular is used. The outside line is connected to a network that can provide a call transfer service, and may be connected to an ISDN (Integrated Services Digital Network). The external line call control unit 12 controls incoming calls from external lines or outgoing calls to external lines. When an external line transfer destination is set for the called extension, the external line transfer control unit 13 notifies the external line number of the transfer destination to the network based on a predetermined protocol via the external line IF unit 11 and executes the incoming call transfer service. .

  The extension call control unit 14 controls incoming calls to the extension telephones or outgoing calls from the extension telephones. In particular, transfer setting and transfer control at the time of an incoming call are automatically performed by transfer telephone setting control, and the access state of the wireless terminal is monitored and wireless terminal information control such as registration as an entry state is performed. The transfer telephone setting control function can rewrite the transfer settings of the fixed telephone setting table 17 and the wireless terminal setting table 18 by a predetermined operation by the user via an internal telephone or an external line. Therefore, the transfer telephone setting control function includes the above-described in-range / out-of-range entry registration means, transfer setting state transfer setting means, and transfer setting release means.

  The telephone IF unit 15 connects at least one fixed telephone 21 via a wired LAN, and exchanges information with the extension call control unit 14. The wireless IF unit 16 is connected to the wireless base station 30 via a wireless LAN, and exchanges information with the extension call control unit 14.

  The fixed telephone setting table 17 and the wireless terminal setting table 18 are information in which memory area information is collectively described in a table, and the memory form in the memory area is usually different from that shown in the figure. For example, the wireless terminal and the fixed telephone that are linked may be formed of either one table or an independent table.

  The fixed telephone set table 17 includes areas such as extension numbers of wireless terminals to be linked, presence / absence of transfer settings, transfer destination number list, etc. corresponding to the extension number of the fixed telephone. The extension number area of the linked wireless terminal is illustrated as a linked wireless terminal. The transfer setting presence / absence area is illustrated as a transfer setting state, and can be manually set in advance by a user using a well-known means. In the present invention, it is executed by transfer telephone setting control of the extension call control unit 14. The transfer destination number list area is illustrated only as a transfer destination list, and priorities can be set for a plurality of transfer destinations. When there is a linked wireless terminal, the transfer destination list includes a telephone number in the mobile telephone network of the linked wireless terminal.

  Accordingly, when there is no transfer setting when an incoming call is received at the extension number of the fixed telephone 21, the extension call control unit 14 calls the fixed telephone 21 with the received extension number. However, if there is no transfer setting when the extension number of the linked wireless terminal 31 is called and transferred to the fixed telephone 21, the extension call control unit 14 may call only the fixed telephone 21, Call signals can be sent to both the wireless terminal 31 and the fixed telephone 21. Also, when there is a transfer setting when an extension number of the linked wireless terminal 31 is called and transferred to the fixed telephone 21, the extension call control unit 14 calls according to the transfer destination list and the transfer destination is busy. In this case, the data is sequentially transferred according to the priority order.

  The wireless terminal setting table 18 includes areas such as an extension number of a fixed telephone to be linked, presence / absence of access to a wireless LAN, and a transfer destination number list corresponding to the extension number of the wireless terminal. The extension number area of the fixed telephone to be linked is illustrated as a linked fixed telephone. The access presence / absence area with the wireless LAN is illustrated as an entry state. In the present invention, whether or not the wireless base station 30 is accessing the target wireless terminal 31 by the wireless terminal information control of the extension call control unit 14 is within range. Or out of range. The transfer destination number list area is illustrated only as a transfer destination list, and priorities can be set for a plurality of transfer destinations. The transfer destination list includes mobile phone numbers in the mobile telephone network of the wireless terminal. When the entry state is out of service area by the mobile phone number, the external line transfer control unit 13 is driven as the transfer setting, and the wireless terminal 31 is transferred outside the line regardless of the incoming call by the extension number, and from the mobile phone network. Incoming call is called.

  The fixed telephone 21 is assumed to be a button telephone, but may be another multi-function telephone or an IP telephone according to the control protocol of the telephone main device 10. As described above, it is desirable to use SIP as the call control protocol. In the case shown in the figure, the fixed telephone 21 has a separate extension number with the wireless terminal 31 and works in a pair.

  The wireless base station 30 is connected to the wireless IF unit 16 to form a wireless LAN, and accesses the wireless terminal 31 by the short-range wireless method. The wireless terminal 31 has a dual mode of a short-range wireless device that accesses a wireless LAN and a mobile phone wireless device that accesses a mobile phone network. Therefore, the radio terminal 31 normally operates as a mobile phone radio, for example, and operates as an extension of the telephone main device 10 when accessing the radio base station 30.

  Next, referring to FIG. 1 together with FIG. 2, the operation of the telephone main unit 10 for automatic setting for transfer of the linked fixed telephone 21 and wireless terminal 31 in the fixed telephone setting table 17 and the wireless terminal setting table 18 This will be explained according to the procedure. Regardless of the presence or absence of linkage, transfer can be set by the user by a predetermined procedure for all the extensions. Since the procedure is not included in the present invention, the description is omitted. Further, it is assumed that the mobile phone number of the wireless terminal 31 is registered with the highest priority of the transfer destination of the fixed telephone 21 and the wireless terminal 31, and the initial entry state of the wireless terminal is within the range. .

  First, the wireless terminal information control function of the extension call control unit 14 confirms the entry status of the wireless terminal 31 via the wireless IF unit 16 and the wireless base station 30 (procedure S1), and is out of service area (YES in step S2). In this case, the extension call control unit 14 sets the entry state of the wireless terminal 31 in the wireless terminal setting table 18 to the outside of the service area, and investigates the presence / absence of the interlocking fixed telephone (step S3). When the extension number of the fixed telephone 21 is in the linked telephone area of the wireless terminal 31 (YES in step S4), the extension call control unit 14 transfers the call to the transfer setting status area of the linked fixed telephone 21 in the fixed telephone setting table 17 Is set (step S5). If the above step S4 is “NO” and there is no interlocking fixed telephone, the procedure ends as it is. If necessary, the extension call control unit 14 confirms the out-of-service setting of the corresponding entry state in the wireless terminal setting table 18.

  When the above step S2 is “NO” and the entry state of the wireless terminal 31 is confirmed as being within range, the extension call control unit 14 confirms the entry state of the wireless terminal 31 in the wireless terminal setting table 18 and locks it together. The presence / absence of the telephone is checked (step S11). The extension call controller 14 has the extension number of the fixed telephone 21 in the linked telephone area of the wireless terminal 31 (YES in step S12), and transfers it to the transfer setting status area of the linked fixed telephone 21 in the fixed telephone setting table 17 If there is a setting (YES in step S13), the transfer setting is canceled (step S14). When the above step S12 is “NO” and there is no extension number of the fixed telephone 21 in the linked telephone area of the wireless terminal 31, and when the above step S13 is “NO”, the transfer setting of the linked fixed telephone 21 in the fixed telephone setting table 17 If there is no transfer setting in the status area, the procedure ends.

  Next, with reference to FIG. 3 together with FIG. 1, a procedure for an incoming call operation to the wireless terminal 31 using the fixed telephone setting table 17 and the wireless terminal setting table 18 of the telephone main apparatus 10 will be described.

  When the extension call control unit 14 accepts an incoming call to the wireless terminal 31, the extension call control unit 14 checks the entry state and the presence / absence of the interlocking fixed telephone in the wireless terminal 31 area of the wireless terminal setting table 18 (step S21). When the entry status is within range (YES in step S22) and the fixed fixed telephone 21 is present (YES in step S23), the extension call control unit 14 searches the fixed telephone setting table 17 for the fixed telephone 21 area, and there is no transfer setting. In the case of (NO in step S24), the fixed telephone 21 is called by calling control (step S25). The extension call as the interlocking fixed telephone 21 can also call the wireless terminal 31 at the same time. This control is effective when the user who owns the wireless terminal 31 is away from the interlocking fixed telephone 21.

  When the step S23 is “NO” and there is no interlocking fixed telephone, the extension call control unit 14 calls the radio terminal having the called extension number from the radio IF unit 16 via the radio base station 30 (see FIG. Step S26) is performed. This is the case where the above step S24 is “YES” and the transfer is set to the fixed fixed telephone or the transfer is manually set, and the extension call control unit 14 transfers the call to the transfer destination according to the transfer destination list of the fixed telephone 21. (Procedure S27) is performed.

  When the above step S22 is “NO” and the entry state is out of service area and there is the interlocking fixed telephone 21 (YES in step S31), the extension call control unit 14 searches the fixed telephone setting table 17 for the fixed telephone 21 area. Therefore, when there is no transfer setting (NO in step S32), the setting is manual, and the extension call control unit 14 performs incoming call control (step S33) for calling the fixed telephone 21.

  When the above step S31 is “NO” and the wireless terminal has no linked fixed telephone, the entry state of the wireless terminal area is “out of service area”, and therefore, transfer control for transmitting to the transfer destination according to the transfer destination list of the wireless terminal (Procedure S34) is performed. Usually, since the mobile phone number of the wireless terminal is registered with the highest priority at the transfer destination, the wireless terminal is called and the user who owns it can receive it.

  If the above step S32 is “YES” and there is a transfer setting for the interlocking fixed telephone 21, the transfer processing is performed according to the transfer destination list and the procedure S27 is transmitted to the transfer destination. In this case, since the mobile phone number of the wireless terminal 31 to be linked is registered with the highest priority in the transfer destination list, the user can receive an incoming call with the extension number at the mobile terminal 31 that carries it.

  Since such a configuration is adopted, even when a wireless terminal using a wireless LAN used as an extension in a telephone switching system goes out of the wireless LAN area, a call using the extension number is automatically received by a mobile phone number. There is an effect that can be.

  In the above description, the extension numbers of the fixed telephone and the wireless terminal are registered in the fixed telephone setting table 17 and the wireless terminal setting table 18. However, the extension numbers correspond to the extensions of the telephone IF unit 15 and the wireless IF unit 16, respectively. There is a phone number or port number. The telephone main unit usually has a correspondence table between telephone numbers of extension lines and port numbers.

  In the above description, the network that can supply the incoming call transfer service such as VoIP and ISDN as an external line has been described. However, in the case of an analog line, the telephone main device can know the telephone number as the transfer destination address. When there is an appropriate number of outside lines, it is possible to call automatically and call a transfer destination of outside lines.

  Note that the incoming call control and outgoing call control in the fixed telephone are the same as in the prior art, and the description thereof is omitted. By the way, in the fixed telephone having a linked wireless terminal, since the mobile phone number of the linked wireless terminal is registered at the transfer destination, even if there is no call to the fixed telephone in the case of manual setting, the A wireless terminal can always be called.

  In recent years, the presence function has been strengthened by building a system on the network, and each person can check the current status of the other party by entering and setting his / her status. Services that can select the most suitable communication means from messages, e-mails, etc. are prevalent. Therefore, the telephone switching system incorporates the presence function in the telephone main unit or uses the network presence function to automatically register the status for each extension, thereby realizing the function using the information. be able to. That is, the embodiment is also included in the present invention. This can be easily realized by using SIP in a telephone switching system.

  Even when a dual-mode wireless terminal is used as a mobile phone and a wireless terminal using a wireless LAN used as an extension in a telephone switching system goes out of the wireless LAN area, the mobile phone number can be automatically called by an extension number. Can receive a call. Therefore, in a telephone exchange system in which calls can be made between extension telephones or slaves using wireless terminals, even when the wireless terminal goes out of the range from the wireless LAN, it can be applied to a purpose of calling it easily.

It is explanatory drawing which showed one Embodiment of the telephone switching system by this invention with the block. It is explanatory drawing which showed one Embodiment of the procedure which concerns on the transfer automatic setting of the telephone switching system in FIG. 1 with the flowchart. FIG. 2 is an explanatory diagram showing, in a flowchart, an embodiment of a procedure related to an incoming call to a wireless terminal of the telephone exchange system in FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Telephone switching system 10 Telephone main apparatus 11 Outside line IF part 12 Outside line call control part 13 Outside line transfer control part 14 Extension line control part 15 Telephone IF part 16 Wireless IF part 17 Fixed telephone setting table 18 Wireless terminal setting table 21 Fixed telephone 30 Wireless base station 31 Wireless terminal

Claims (6)

In a telephone exchange system that uses a wireless terminal that accesses a wireless LAN (local area network) and a wired fixed telephone in conjunction with an extension number,
The wireless terminal has a dual mode capable of accessing a public mobile phone network and the wireless LAN,
At least one external line on one side, and a plurality of internal lines on the other side, each of which accommodates and connects each of the main devices for call connection control,
Wherein when there is an incoming call to the wireless terminal when the wireless terminal is within range of the wireless LAN, and to transfer the incoming call to the wireless terminal to a fixed telephone linked to the wireless terminal to, also,
Wherein when the wireless terminal and the wireless terminal when there is an incoming call to the fixed telephone in conjunction is determined to be in out of range of the wireless LAN, the incoming call to the fixed telephone to the wireless terminal A telephone exchange system, wherein the telephone exchange system is controlled so as to transfer through the public mobile phone network.   2. The telephone switching system according to claim 1, wherein VoIP (Voice over Internet Protocol) is used for voice data communication.   3. The telephone exchange system according to claim 2, wherein SIP (Session Initiation Protocol) is used as a call control protocol. 2. The telephone switching system according to claim 1, wherein the main device is
A wireless terminal setting table having information on an interlocking fixed telephone and a wireless LAN in-range / out-of-range entry corresponding to the extension number of the wireless terminal accessing the wireless LAN;
A fixed telephone set table having information on the link destination wireless terminal, the transfer setting status, and the transfer destination number list corresponding to the extension number of the fixed telephone;
Entry registration means for investigating presence / absence of access to the wireless terminal via the wireless LAN and recording the in-range / out-of-range entry in the wireless terminal setting table;
Means for setting the transfer setting state to transfer in the fixed telephone setting table when there is a fixed telephone linked when the entry registration means records out-of-service in the wireless terminal setting table;
Means for canceling the forwarding setting in the forwarding setting state in the fixed telephone setting table when there is a fixed telephone linked when the entry registration means records the area in the wireless terminal setting table;
A telephone exchange system comprising:   5. The telephone exchange system according to claim 4, wherein the main unit has a transfer destination number list area in the wireless terminal setting table, and receives an incoming call to a wireless terminal outside the service area without an interlocking fixed telephone. A telephone exchange system comprising means for forwarding processing according to a number list. In a telephone exchange system according to claim 1, wherein the main unit, the incoming call to the wireless terminal is located within the wireless LAN the radio terminal the radio terminal when there is an incoming call to the when transferring to the fixed telephone linked to the wireless terminal, the telephone switching system comprising means for also call to the wireless terminal via the wireless LAN.

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