JP5058086B2 - Method of waiting for an incoming call with low power consumption, private branch exchange, mobile terminal and program - Google Patents

Description

  The present invention relates to a method for waiting for an incoming call with low power consumption, a private branch exchange, a mobile terminal, and a program. In particular, a mobile terminal waiting for call connection is a mobile phone having a wide area communication interface and a wireless LAN interface.

A cellular phone network (or PHS (Personal Handyphone System) network) is widespread as wide area communication, and a wireless LAN represented by IEEE802.11a / b / g is widespread as local communication. Corresponding to such a communication environment, mobile terminals (mobile phones, mobile terminals (PDA: Personal
Digital assistants and personal computers) including both a mobile phone network communication interface and a wireless LAN interface have also become widespread. Such a mobile terminal can use a cellular phone network outdoors and a wireless LAN on the premises. In the future, it is expected that various communication methods such as WiMAX (Worldwide Interoperability for Microwave Access), LTE (Long Term Evolution), or UMB (Ultra Mobile Broadband) will be provided.

  Here, a reduction in power consumption that is directly related to the continuous use time is always a problem for mobile terminals. In an application such as Web browsing, an appropriate communication interface may be turned on when necessary according to a user operation. However, in an application that waits for an incoming call from a partner terminal such as a voice call, the communication interface must always be powered on. In particular, the power consumption by the wireless LAN interface that can be used on the premises cannot be ignored for portable and small mobile terminals due to the capacity of the battery. Therefore, it is not desirable for the mobile terminal to keep the plurality of communication interfaces powered on from the viewpoint of reducing power consumption.

  First, for a plurality of communication interfaces, there is a technique in which the power of a wireless LAN interface that consumes a large amount of power is turned off and only the mobile phone network communication interface is always turned on (see, for example, Patent Documents 1 and 2). According to this technique, a mobile terminal always receives a call from a partner terminal via a mobile phone network via a mobile phone network communication interface. At this time, the mobile terminal turns on the power of the wireless LAN interface and calls back (calls) to the partner terminal via the wireless LAN using the wireless LAN interface. As a result, power consumption is reduced by turning off the power of the wireless LAN interface when waiting for a call connection.

  Secondly, there is a technique in which a communication interface for which an incoming call is desired among a plurality of communication interfaces provided in a mobile terminal is registered in advance in a facility device of a communication carrier network (see, for example, Patent Document 3). This mobile terminal turns off the power of a communication interface other than the registered communication interface. An incoming call to the mobile terminal is always received by the registered communication interface by the equipment of the carrier network. As a result, power consumption is reduced by turning off the power of the wireless LAN interface when waiting for a call connection.

JP 2005-109850 A JP 2006-025009 A JP 2008-035420 A

  According to the above-described prior art, only a single communication interface is turned on for a mobile terminal having a plurality of communication interfaces.

  However, according to the techniques described in Patent Documents 1 and 2, since the called terminal calls back to the calling terminal, there are a first problem of charging and a second problem of call disconnection. Regarding the first billing problem, the billing system during a call is generally billed to the calling party, but the called party is billed by making a callback. Regarding the second call disconnection problem, the first call is disconnected by making a callback. In particular, in the packet communication network assumed by the technique described in Patent Document 1, callback signaling via a high-speed wireless LAN is more reversed than disconnection signaling via a low-speed mobile phone network. And there is a possibility of reaching first. In this case, since the call before disconnection remains, a callback call cannot be established. In addition, for both the first problem and the second problem, another call is received from a third party to the calling terminal from when the first call is disconnected to when the call is reestablished by callback. When there is a call, there is also a problem that the call of the third party is preferentially connected and eventually the callback is blocked.

  Moreover, according to the technique described in Patent Document 3, all calls are transferred to a communication interface registered in advance for a mobile terminal. As described above, when a mobile terminal having a mobile phone network communication interface and a wireless LAN interface exists on the premises, the mobile phone network communication interface is selected (registered) from the viewpoint of reducing power consumption. . Since the power consumption of the wireless LAN interface is large, the power consumption is reduced by passing all incoming calls through the mobile phone network. However, in order to execute a call based on a high-quality audio codec using high-speed communication of a wireless LAN or a high-quality videophone, it is necessary to always select a wireless LAN interface.

  Accordingly, an object of the present invention is to provide a method, a private branch exchange, a mobile terminal, and a program that allow a mobile terminal having a wide area communication interface and a wireless LAN interface to wait for call connection with low power consumption.

According to the present invention, a private branch exchange arranged in a private LAN interconnected to a wide area communication network;
An incoming call waiting method in a system having a wide area communication interface connected to a wide area communication network and a mobile terminal having a wireless LAN interface connected to a local area LAN,
A first step in which a mobile terminal transmits a registration request including a power-off state of the wireless LAN interface to the private branch exchange via the private LAN using the wireless LAN interface, and turns off the power of the wireless LAN interface;
A second step in which the private branch exchange accepts an incoming call from the calling terminal via the wide area communication network, and holds the call connection of the incoming call;
A third step in which the private branch exchange makes a call to the mobile terminal via the wide area communication network;
A fourth step in which the mobile terminal accepts the call through the wide area communication interface via the wide area communication network and turns on the power of the wireless LAN interface;
A fifth step in which the mobile terminal transmits a registration request including a power-on state of the wireless LAN interface to the private branch exchange via the wireless LAN interface;
The private branch exchange apparatus has a sixth step of canceling the held call connection and making a call connection between the mobile terminal and the calling terminal via the private LAN.

According to another embodiment of the incoming call waiting method of the present invention,
The private branch exchange is a SIP (Session Initiation Protocol) server,
The registration request is a SIP REGISTER method,
The power-on state and the power-off state are also preferably described in the numerical value of the Expires header or the expires parameter of the Contact header.

  According to another embodiment of the incoming call waiting method of the present invention, it is also preferable that the calls in the third step and the fourth step are transmitted by center push using a short message.

  According to another embodiment of the incoming call waiting method of the present invention, the private branch exchange apparatus has the mobile terminal in the fifth step for a predetermined time or more even though the incoming call is suspended in the second step. If the registration request including the power-on state from the terminal cannot be received, a call is made to the mobile terminal via the wide area communication network, or the answering machine control specified in advance is executed, or voice guidance is also executed. preferable.

  According to another embodiment of the incoming call waiting method of the present invention, the first step is performed by a user operation on the mobile terminal when the mobile terminal can connect to the local area LAN using the wireless LAN interface. It is also preferred that it be performed.

According to the present invention, there is a private branch exchange apparatus disposed in a private LAN interconnected to a wide area communication network,
Registration request receiving means for receiving a registration request including a power-off / on state of a wireless LAN interface from a mobile terminal via a local area LAN;
An incoming call reception means for receiving an incoming call from the calling terminal;
If the registration request includes a power-off state of the wireless LAN interface, the incoming call is held; if the registration request includes a power-on state of the wireless LAN interface, an incoming call holding means for canceling the held incoming call;
A calling means for calling a mobile terminal via a wide area communication network when an incoming call is put on hold;
It is characterized by comprising a call connection means for making a call connection via a local area LAN between a mobile terminal and a calling terminal when the incoming call hold is cancelled.

According to another embodiment of the private branch exchange apparatus of the present invention,
The private branch exchange is a SIP server,
The registration request is a SIP REGISTER method,
The power-on state and the power-off state are also preferably described in the numerical value of the Expires header or the expires parameter of the Contact header.

  According to another embodiment of the private branch exchange apparatus of the present invention, it is also preferable that the calling means transmits a call by center push using a short message.

According to another embodiment of the private branch exchange apparatus of the present invention,
The incoming call holding means determines that the incoming call is not possible when the registration request including the power-on state of the wireless LAN interface is not received from the mobile terminal for a predetermined time or more after holding the incoming call.
When it is determined that an incoming call is impossible, the mobile terminal further includes an incoming call disable processing means for making a call to the mobile terminal via the wide area communication network, executing a predetermined answering machine control, or executing voice guidance. It is also preferable.

According to the present invention, a mobile terminal capable of communicating with the private branch exchange described above,
A wide area communication interface for connecting to a wide area communication network;
A wireless LAN interface connected to the local LAN;
Power control means for turning on / off the power of the wireless LAN interface;
An incoming call acceptance means for accepting the call from the private branch exchange via the wide area communication interface via the wide area communication network;
Registration request transmitting means for transmitting a registration request including a power on / off state of the wireless LAN interface to the private branch exchange using the wireless LAN interface;
User interface means for allowing the user to operate the power-off of the wireless LAN interface when connection to the local LAN becomes possible;
A power supply that instructs the registration request transmission means to transmit a registration request including a power-off state of the wireless LAN interface and instructs the power supply control means to power off the wireless LAN interface when the user interface means is turned off. An off instruction means;
And a power-on instruction means for instructing the power control means to turn on the power when the incoming call acceptance means accepts the call.

According to the present invention, there is a private branch exchange program for causing a computer mounted on a server disposed in a local area LAN interconnected to a wide area communication network to function.
Registration request receiving means for receiving a registration request including a power-off / on state of a wireless LAN interface from a mobile terminal via a local area LAN;
An incoming call reception means for receiving an incoming call from the calling terminal;
If the registration request includes a power-off state of the wireless LAN interface, the incoming call is held; if the registration request includes a power-on state of the wireless LAN interface, an incoming call holding means for canceling the held incoming call;
A calling means for calling a mobile terminal via a wide area communication network when an incoming call is put on hold;
The computer is caused to function as call connection means for making a call connection between a mobile terminal and a calling terminal via a local area LAN when canceling the hold of the incoming call.

According to the present invention, a computer mounted on a mobile terminal capable of communicating with the private branch exchange apparatus described above, having a wide area communication interface connected to the wide area communication network and a wireless LAN interface connected to the local area LAN. Is a program that allows
Power control means for turning on / off the power of the wireless LAN interface;
An incoming call acceptance means for accepting the call from the private branch exchange via the wide area communication interface via the wide area communication network;
Registration request transmitting means for transmitting a registration request including a power on / off state of the wireless LAN interface to the private branch exchange using the wireless LAN interface;
User interface means for allowing the user to operate the power-off of the wireless LAN interface when connection to the local LAN becomes possible;
A power-off instruction means for instructing the registration request transmission means to transmit a registration request including a power-off state of the wireless LAN interface when the user interface means is operated to be turned off; ,
When the incoming call reception unit receives the call, the computer is caused to function as a power-on instruction unit that instructs the power control unit to turn on the wireless LAN interface.

  According to the incoming call waiting method, private branch exchange apparatus, mobile terminal and program of the present invention, the mobile terminal can turn on the power at the time of incoming call even if the wireless LAN interface is turned off. It is possible to wait for a call connection with low power consumption.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a system configuration diagram according to the present invention.

  According to FIG. 1, a local LAN 1 is configured indoors, and an IP-PBX (Internet Protocol-Private Branch Exchange) (local SIP server) 10, a router 11, a media gateway 12, and a DHCP (Dynamic Host Configuration). Protocol) server 13 and access point 14 are connected. In addition, the mobile terminal 20 serving as an incoming call terminal has a cellular communication interface connected to a cellular (wide area) communication network and a wireless LAN interface connected to the wireless LAN communication network. The mobile terminal 20 can communicate with the wireless access point 14 via a wireless link and connect to the local LAN 1.

  The IP-PBX 10 functions as a circuit switch for an IP telephone terminal in an IP network, and realizes an IP telephone extension telephone network in an intra-company LAN such as a company or a home. In particular, the IP-PBX also has a circuit switching function between the WAN of the wide area communication network and the LAN. The IP-PBX 1 is a SIP server as a private branch exchange in order to accept a call request from a terminal.

  The router 11 interconnects the Internet 2, which is a wide area communication network, and the local LAN 1. The media gateway 12 interconnects the public line network 2 that is a wide area communication network and the local area LAN that is the local area LAN.

  The DHCP server 13 responds with an IP address and setting information when receiving an address acquisition request from a mobile terminal (DHCP client), and is a server for automatic network setting. The address response also includes a lease period indicating the valid period of the IP address. Within this lease period, the mobile terminal needs to send an address update request to the DHCP server 13 again.

  Moreover, according to FIG. 1, the wide area communication network 2 is comprised outdoors and the calling terminal 21 and the center push server 22 are connected. Of course, the calling terminal 21 may be connected to the indoor private LAN 1. The wide area communication network 2 is a communication network such as a mobile phone network (cellular communication network), the Internet, or a public line network. The center push server 22 is a mail push device that simultaneously transmits a short message to a mobile terminal via a mobile phone network.

  FIG. 2 is a registration sequence diagram according to the present invention.

  According to FIG. 2, it is assumed that the user having the mobile terminal 20 has moved indoors where it can be connected to the local area LAN 1. At this time, the user operates to set the mobile terminal 20 that the wireless LAN interface has moved to a usable position. At this time, the mobile terminal 20 first turns on the power of the wireless LAN interface.

(S201) The mobile terminal 20 discovers the access point 14 connected to the local area LAN 1, and establishes a wireless link by wireless association.
(S202) The mobile terminal 20 transmits an address acquisition request to the DHCP server 13 via the access point 14, and acquires an address as a response. At this time, the mobile terminal 20 also acquires a DHCP lease period. The mobile terminal 20 starts a timer for the DHCP lease period and measures the time.

(S203) The mobile terminal 20 transmits a “registration request” including “a power-off state of the wireless LAN interface” to the IP-PBX 10 via the access point. According to the present invention, even if the wireless LAN interface is located indoors and can communicate with the access point 14, power consumption is reduced by turning off the power of the wireless LAN interface.

  Since the IP-PBX 10 is a SIP server as a private branch exchange apparatus, the “registration request” is, for example, a SIP REGISTER method. Here, in order to ensure compatibility with the existing SIP REGISTER method, “the power-off state of the wireless LAN interface” is described in, for example, the numerical value of the Expires header or the expires parameter of the Contact header. A numerical value within a certain range can be described in these values, but a specific numerical value that is not generally used is defined in “power-off state of wireless LAN interface” / “power-on state of wireless LAN interface” Can do. The IP-PBX 10 that has received the “registration request” returns a registration response (200 OK) to the mobile terminal 20.

(S204) Here, the mobile terminal 20 automatically turns off the power of the wireless LAN interface. Thereafter, the power-off state is maintained only for the Expires value period shorter than the DHCP lease period.

(S205) The mobile terminal 20 turns on the power of the wireless LAN interface again before the Expires value period elapses.
(S206) The mobile terminal 20 discovers the access point 14 connected to the local area LAN 1, and establishes a wireless link by wireless association.
(S207) The mobile terminal 20 transmits a “registration request” including “a power-off state of the wireless LAN interface” to the IP-PBX 10 via the access point. In response to this, the IP-PBX 10 returns a registration response (200 OK).
(S208) Here, the mobile terminal 20 automatically turns off the power of the wireless LAN interface again.

(S209) Thereafter, before the DHCP lease period times out, the mobile terminal 20 turns on the power of the wireless LAN interface.
(S210) The mobile terminal 20 discovers the access point 14 connected to the local LAN 1, and establishes a wireless link by wireless association.
(S211) The mobile terminal 20 transmits an address update request to the DHCP server 13 via the access point 14, and requests further extension of the DHCP lease period.

  FIG. 3 is a call connection standby sequence diagram in the present invention.

(S301) It is assumed that the calling terminal 21 makes a call to the mobile terminal 20 that is a called terminal. At this time, for example, SIP INVITE is received by the IP-PBX 10 via the router 11. As a response, the IP-PBX 10 returns 100 Trying. As a result, the IP-PBX 10 accepts an incoming call from the calling terminal.

(S302) The IP-PBX 10 suspends the call connection of the incoming call when the incoming call terminal 20 is registered to turn off the wireless LAN interface.

(S303) Next, the IP-PBX 10 issues a call for the mobile terminal 20 to the center push server 22 connected to the mobile phone network. This call is specifically a short message. In addition, sender information can be incorporated into the short message. The calling party can be clearly indicated to the called party.

(S304) Upon receiving the short message from the IP-PBX 10, the center push server 22 pushes the message to the mobile terminal 20 in a push manner.

(S305) The mobile terminal 20 that has received the short message recognizes that there is an incoming call to the IP-PBX 10, and turns on the power of the wireless LAN interface. Then, the mobile terminal 20 finds the access point 14 connected to the local area LAN 1 and establishes a wireless link by wireless association.

(S306) The mobile terminal 20 transmits a “registration request” including the “power-on state of the wireless LAN interface” to the IP-PBX 10 via the access point. As this response, the IP-PBX 10 returns a registration response (200 OK) to the mobile terminal 20. As a result, the IP-PBX 10 recognizes that the mobile terminal 20 is ready to receive a call.

(S307) The IP-PBX 10 cancels the held call in S302 and transmits a SIP INVITE serving as a call connection request to the mobile terminal 20. In response to this, the mobile terminal 20 returns 100 Trying and 180 Ringing. The IP-PBX 10 transmits 180 Ringing to the calling terminal 21 via the router 11. Further, the mobile terminal 20 transmits 200OK to the IP-PBX 10, and the IP-PBX 10 transmits the 200OK message to the calling terminal 21 via the router 11. When receiving the ACK from the calling terminal 21, the IP-PBX 10 transmits the ACK to the mobile terminal 20.

(S308) Thereby, the IP-PBX 10 completes the call connection between the calling terminal 21 and the mobile terminal 20.

  When the mobile terminal 20 always turns on the power of the wireless LAN interface without performing the processing of the present invention as shown in FIGS. 2 and 3, a registration request (power on) is sent to the IP-PBX 10 Send it to.

  FIG. 4 is a sequence diagram when a failure occurs in the present invention.

  According to FIG. 4, S301 to S304 are exactly the same as FIG. FIG. 4 shows a sequence when a communication failure occurs after S304. As a communication failure in this case, for example, the center push call transmitted by the center push server 22 is not received by the mobile terminal 20, or the SIP REGISTER transmitted by the mobile terminal 20 is not received by the IP-PBX 10. There are cases.

  When the IP-PBX 10 suspends the incoming call in S302, the IP-PBX 10 starts a timer and measures the communication failure recognition time. This timer is stopped at S308 (see FIG. 3) when the incoming call hold is canceled. Therefore, if the communication failure recognition time has timed out after canceling the call after holding the incoming call, it is determined that a communication failure has occurred.

  If the IP-PBX 10 determines that a communication failure has occurred, the IP-PBX 10 makes a call to the mobile terminal 20 via the mobile phone network (wide area communication network), or executes a predetermined answering machine control.

  FIG. 5 is a functional configuration diagram of the private branch exchange apparatus and the called terminal in the present invention.

  The private branch exchange 1 includes a LAN interface 101, a registration request receiving unit 102, an incoming call accepting unit 103, an incoming call holding unit 104, a calling unit 105, a call connection unit 106, and an incoming call impossible processing unit 107. Have Except for the LAN interface 101, these functional components are realized by executing a private branch exchange program that causes a computer installed in the server to function.

  The registration request receiving unit receives a registration request including the power on / off state of the wireless LAN interface from the mobile terminal 20 via the LAN interface 101. The registration request is, for example, a SIP REGISTER method, and the power-on state and the power-off state are described in the numerical value of the Expires header or the expires parameter of the Contact header. The power on / off state is output to the incoming call holding unit 104.

  The incoming call reception unit 103 receives a call from the calling terminal via the wide area communication network from the LAN interface 101. The accepted call is notified to the incoming call holding unit 104.

  The incoming call holding unit 104 holds the incoming call when the registration request includes the power-off state of the wireless LAN interface, and releases the held incoming call when the registration request includes the power-on state of the wireless LAN interface. To do. In addition, the incoming call holding unit 104 determines that the incoming call is not possible when the registration request including the power-on state is not received from the mobile terminal for a predetermined time or more after holding the incoming call. When it is determined that the incoming call is impossible, the fact is notified to the incoming call impossible processing unit 107.

  The calling unit 105 calls the mobile terminal 20 via the wide area communication network when the incoming call is put on hold. Here, the calling unit 105 transmits a call by center push using a short message.

  The call connection unit 106 makes a call connection between the mobile terminal and the calling terminal when canceling the hold of the incoming call.

  The unacceptable processing unit 107 makes a call to the mobile terminal so as to pass through the wide-area communication network, or executes the answering machine control and the voice response control defined in advance.

  The mobile terminal 20 includes a wide area communication interface 201 connected to a wide area communication network, a wireless LAN interface 202 connected to a local area LAN, a power supply control unit 203, an incoming call reception unit 204, a registration request transmission unit 205, a user interface. Unit 206, power-off instruction unit 207, power-on instruction unit 208, and call connection processing unit 209. Except for the wide area communication interface 201 and the wireless LAN interface 202, these functional components are realized by executing a program for causing a computer mounted on the mobile terminal to function.

  The power control unit 203 turns on / off the power of the wireless LAN interface 202.

  The incoming call accepting unit 204 accepts the call from the IP-PBX 10 by the wide area communication interface via the cellular (wide area) communication network. The call may be a short message. The power-on instruction unit 208 is notified that the incoming call has been received.

  The registration request transmission unit 205 transmits a registration request including the power on / off state of the wireless LAN interface to the IP-PBX 10 using the wireless LAN interface 202.

  When the user interface unit 206 becomes connectable to the wireless local area LAN, the user interface unit 206 causes the user to turn off the power of the wireless LAN interface.

  The power-off instruction unit 207 instructs the registration request transmission unit 205 to transmit a registration request including a power-off state when the user interface unit 206 is operated to power off, and instructs the power control unit 203 to turn off the power. To do.

  When the incoming call reception unit 204 receives the call, the power-on instruction unit 208 instructs the power supply control unit 203 to turn on the power.

  As described above in detail, according to the incoming call waiting method, private branch exchange apparatus, mobile terminal and program of the present invention, even when the mobile terminal is powered off, Since the power can be turned on, it is possible to wait for a call connection with low power consumption.

  According to the present invention, the mobile terminal can turn off the power of the wireless LAN interface other than during registration with the SIP server (private branch exchange) or during a call. If there is an incoming call in the SIP server, the incoming call is notified to the incoming call terminal by a short message via the mobile phone network while holding the incoming session on hold. The called terminal turns on the power of the wireless LAN interface and transmits a SIP REGISTER to the SIP server to establish a held session. This eliminates the need for a callback as in the prior art.

  In the various embodiments of the present invention described above, various changes, modifications, and omissions in the scope of the technical idea and the viewpoint of the present invention can be easily made by those skilled in the art. The above description is merely an example, and is not intended to be restrictive. The invention is limited only as defined in the following claims and the equivalents thereto.

It is a system configuration diagram in the present invention. It is a registration sequence diagram in the present invention. It is a call connection waiting sequence diagram in the present invention. It is a sequence diagram at the time of failure occurrence in the present invention. It is a functional block diagram of the private branch exchange apparatus and the called terminal in the present invention.

Explanation of symbols

1 Local LAN
DESCRIPTION OF SYMBOLS 10 IP-PBX, private branch exchange 101 LAN interface 102 Registration request receiving part 103 Incoming call acceptance part 104 Incoming call holding part 105 Calling part 106 Call connection part 107 Unreceivable processing part 11 Router 12 Media gateway 13 DHCP server 14 Access Point 2 Wide area communication network, cellular phone network, Internet, public line network 20 Mobile terminal, incoming call terminal 201 Wide area communication interface 202 Wireless LAN interface 203 Power supply control unit 204 Incoming call reception unit 205 Registration request transmission unit 206 User interface unit 207 Power supply OFF instruction unit 208 Power ON instruction unit 21 Calling terminal 22 Center push server

Claims (12)

A private branch exchange located in a private LAN interconnected to a wide area communication network;
An incoming call waiting method in a system having a wide area communication interface connected to the wide area communication network and a mobile terminal having a wireless LAN interface connected to the local area LAN,
The mobile terminal transmits a registration request including a power-off state of the wireless LAN interface to the private branch exchange via the private LAN using the wireless LAN interface, and turns off the wireless LAN interface. A first step;
A second step in which the private branch exchange apparatus accepts an incoming call from a calling terminal via the wide area communication network and suspends the call connection of the incoming call;
A third step in which the private branch exchange makes a call to the mobile terminal via the wide area communication network;
A fourth step in which the mobile terminal accepts the call by the wide area communication interface via the wide area communication network and turns on the power of the wireless LAN interface;
A fifth step in which the mobile terminal transmits a registration request including a power-on state of the wireless LAN interface to the private branch exchange via the wireless LAN interface;
The private branch exchange apparatus has a sixth step of canceling the held call connection and making a call connection between the mobile terminal and the calling terminal via the private LAN. Call waiting method. The private branch exchange is a SIP (Session Initiation Protocol) server,
The registration request is a SIP REGISTER method,
The incoming call waiting method according to claim 1, wherein the power-on state and the power-off state are described in a numerical value of an Expires header or an expires parameter of a Contact header.   The incoming call waiting method according to claim 1 or 2, wherein the calls in the third step and the fourth step are transmitted by center push by a short message.   The private branch exchange apparatus has failed to receive a registration request including the power-on state from the mobile terminal in the fifth step for a predetermined time or more, even though the incoming call is suspended in the second step. In this case, a call is made to the mobile terminal via the wide area communication network, a predetermined answering machine control is executed, or voice guidance is executed. The incoming call waiting method according to the item.   The first step is executed by a user operation on the mobile terminal when the mobile terminal can connect to the local area LAN using the wireless LAN interface. The incoming call waiting method according to any one of the above. A private branch exchange device arranged in a private LAN interconnected with a wide area communication network,
Registration request receiving means for receiving a registration request including a power-off / on state of the wireless LAN interface from a mobile terminal via the local LAN;
An incoming call reception means for receiving an incoming call from the calling terminal;
If the registration request includes a power-off state, the incoming call is held; if the registration request includes a power-on state, an incoming call holding means for canceling the held incoming call;
A calling means for calling the mobile terminal via the wide area communication network when the incoming call is put on hold;
A private branch exchange apparatus comprising: call connection means for connecting a call between the mobile terminal and the calling terminal via the private LAN when the incoming call hold is released. The private branch exchange is a SIP server;
The registration request is a SIP REGISTER method,
The private branch exchange apparatus according to claim 6, wherein the power-on state and the power-off state are described in a numerical value of an Expires header or an expires parameter of a Contact header.   The private branch exchange apparatus according to claim 6 or 7, wherein the calling means transmits a call by center push using a short message. The incoming call holding means determines that the incoming call is not possible when the registration request including the power-on state is not received from the mobile terminal for a predetermined time or more after holding the incoming call.
When it is determined that the call cannot be received, the mobile terminal makes a call via the wide area communication network, executes a predetermined answering machine control, or executes a voice guidance. The private branch exchange apparatus according to any one of claims 6 to 8, further comprising means. The mobile terminal capable of communicating with the private branch exchange according to any one of claims 6 to 9,
A wide area communication interface connected to the wide area communication network;
A wireless LAN interface connected to the local LAN;
Power control means for turning on / off the power of the wireless LAN interface;
An incoming call acceptance means for accepting the call from the private branch exchange by the wide area communication interface via the wide area communication network;
Registration request transmitting means for transmitting a registration request including a power on / off state of the wireless LAN interface to the private branch exchange using the wireless LAN interface;
User interface means for allowing a user to operate power off of the wireless LAN interface when connection to the local LAN is possible;
When the user interface unit is operated to turn off the power, the registration request transmission unit is instructed to transmit a registration request including a power-off state of the wireless LAN interface, and the power control unit is powered on. Power off instruction means for instructing off;
A mobile terminal comprising: a power-on instructing unit that instructs the power control unit to turn on the power when the incoming call accepting unit accepts the call. A private branch exchange program for causing a computer mounted on a server arranged in a private LAN interconnected to a wide area communication network to function.
Registration request receiving means for receiving a registration request including a power-off / on state of the wireless LAN interface from the mobile terminal via the local area LAN;
An incoming call reception means for receiving an incoming call from the calling terminal;
If the registration request includes a power-off state of the wireless LAN interface, the incoming call is put on hold; if the registration request includes a power-on state on the wireless LAN interface, an incoming call that releases the held incoming call Holding means,
A calling means for calling the mobile terminal via the wide area communication network when the incoming call is put on hold;
A program for private branch exchange, which causes a computer to function as call connection means for making a call connection between the mobile terminal and the calling terminal via the private LAN when releasing the hold of the incoming call . 10. The mobile terminal capable of communicating with the private branch exchange apparatus according to claim 6, comprising: a wide area communication interface connected to the wide area communication network; and a wireless LAN interface connected to the local LAN. A program for causing a computer mounted on the mobile terminal to function,
Power control means for turning on / off the power of the wireless LAN interface;
An incoming call acceptance means for accepting the call from the private branch exchange by the wide area communication interface via the wide area communication network;
Registration request transmitting means for transmitting a registration request including a power on / off state of the wireless LAN interface to the private branch exchange using the wireless LAN interface;
User interface means for allowing a user to operate power off of the wireless LAN interface when connection to the local LAN is possible;
A power supply that instructs the registration request transmission means to transmit a registration request including a power-off state of the wireless LAN interface when the user interface means is operated to power off, and instructs the power supply control means to turn off the power. An off instruction means;
A program for a mobile terminal, which causes a computer to function as power-on instruction means for instructing power-on of the wireless LAN interface to the power control means when the incoming call acceptance means accepts the call.

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