JP6623125B2 - VoIP gateway device - Google Patents

Description

  The present invention relates to a setting confirmation technique for confirming various settings in a telephone system in which a plurality of telephone terminals accommodated in an extension are exchange-connected to a telephone network.

  For telephone systems such as business phones that exchange and connect multiple telephone terminals to the telephone network, the same outgoing and incoming call function as the outgoing and incoming call function for the external telephone connected to the network side line from the telephone network, that is, the external line There is an extension outgoing / incoming function for the telephone terminal accommodated in the extension of the telephone system, and the user can use the external line outgoing / incoming function and the extension outgoing / incoming function separately on the same telephone terminal.

  For this reason, in the telephone system, the type of LED lighting color and flashing pattern displayed on the telephone terminal and the type of ring tone transmitted from the telephone terminal are set in advance so that the user can easily recognize the difference between the external line and the internal line. Based on the setting contents set in the telephone system, a distinction is made according to the external line / extension line (for example, see Patent Document 1).

Japanese Patent Application Laid-Open No. 07-030665

Conventionally, various settings in such a telephone system require specialized knowledge. Therefore, when a telephone system is installed, a construction person sets and confirms the setting contents.
At this time, in order to confirm that there are no errors in the settings related to the functions related to the outside line in particular, the construction person actually calls the telephone system via the telephone network to check the incoming line display, It is necessary to confirm the outgoing call from the telephone terminal to the connected telephone.

  For this reason, when checking the telephone system settings, the network side line from the telephone network must be connected to the telephone system. If the network side line cannot be used for some reason, check the settings related to the external line system of the telephone system. There was a problem that it was not possible.

  An object of the present invention is to solve such a problem, and to provide a setting confirmation technique capable of performing setting confirmation regarding an external line system of a telephone system even when a network side line from the telephone network cannot be used. Yes.

  In order to achieve such an object, a VoIP gateway apparatus according to the present invention exchanges and connects a network side line on the IP telephone network side and a plurality of telephone lines on the telephone system side that accommodates a plurality of telephone terminals. A gateway device, which is connected to the network side line and exchanges call control messages with the IP telephone network side, and the telephone system via the telephone line A gateway processing unit that mutually converts a call control signal to be exchanged and the call control message, and the network side I / F when the device operates in a pseudo call control mode for confirming the setting contents of the telephone system. A pseudo call control unit that performs pseudo call control of the telephone system by exchanging the call control message with the gateway processing unit via a unit. .

  Also, one configuration example of the VoIP gateway device according to the present invention is an outside line transmission to the second telephone line out of the telephone lines, which is transmitted from the telephone system to the first telephone line among the telephone lines. In response to the call control signal indicating the outgoing call, the outgoing call control message indicating the outgoing call is notified to the network side I / F unit, and the pseudo call control unit is notified via the network side I / F unit. In response to the received call control message, an incoming call control message indicating an incoming call to the second telephone line is generated and notified to the network side I / F unit. The gateway processing unit In response to the incoming call control message notified via the network side I / F unit, a call control signal indicating an incoming call to the second telephone line is sent from the second telephone line to the telephone system. To send to Those were.

  Also, in one configuration example of the VoIP gateway device according to the present invention, the network side I / F unit detects whether or not the network side line is usable, and when the network side line is unusable, Is switched to the pseudo call control mode, and the call control message is exchanged between the gateway processing unit and the pseudo call control unit.

  Also, in the above-described configuration example of the VoIP gateway device according to the present invention, the network side I / F unit detects whether or not the network side line is usable, and when the network side line is usable, Is switched to the normal mode, and the call control message is exchanged between the gateway processing unit and the IP telephone network side.

  Also, in one configuration example of the VoIP gateway device according to the present invention, the gateway processing unit is configured to send a second telephone line out of the telephone lines transmitted from an IP terminal connected via a terminal I / F unit. In response to a call control message indicating external line transmission to the network, the network side I / F unit is notified of a call control message for calling indicating external line transmission, and the pseudo call control unit transmits the network side I / F unit to the network side I / F unit. In response to the call control message sent via the call, a call control message for incoming call indicating an incoming call to the second telephone line is generated and notified to the network side I / F unit, and the gateway The processing unit sends a call control signal indicating an incoming call to the second telephone line from the second telephone line in response to the incoming call control message notified via the network side I / F part. To the telephone system In which it was to be out.

  According to the present invention, even when the network side line on the IP telephone network side cannot be used, the telephone system is pseudo-controlled by the VoIP gateway device. For this reason, it is possible to perform setting confirmation for the telephone line by making an external line call from the telephone system to the telephone line accommodated in the own apparatus.

It is a block diagram which shows the structure of a VoIP gateway apparatus. It is explanatory drawing which shows the outline of the setting confirmation operation | movement concerning 1st Embodiment. It is a sequence diagram which shows the setting confirmation operation | movement concerning 1st Embodiment. It is explanatory drawing which shows the outline of the setting confirmation operation | movement concerning 2nd Embodiment. It is a sequence diagram which shows the setting confirmation operation | movement concerning 2nd Embodiment.

Next, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
First, with reference to FIG. 1, the VoIP gateway apparatus 10 concerning the 1st Embodiment of this invention is demonstrated. FIG. 1 is a block diagram showing the configuration of the VoIP gateway device.
The VoIP gateway device 10 is connected between the IP telephone network NW and the telephone system 20 and mutually converts protocols between a call control message exchanged with the IP telephone network NW and a call control signal exchanged with the telephone system 20. Thus, VoIP (Voice over Internet Protocol) communication using the IP telephone network NW by the telephone system 20 is realized by switching and connecting the network line L1 on the IP telephone network NW side and the telephone line L2 on the telephone system 20 side. It has a function to do.

  The telephone system 20 includes a telephone control apparatus ME connected to the VoIP gateway apparatus 10 via a telephone line L2, and n (n is an integer of 2 or more) connected to the telephone control apparatus ME via an extension line LN. , STn, and has a function of exchanging and connecting these telephone terminals ST1, ST2,..., STn and the telephone line L2.

  The telephone line L2 is composed of an analog line (Public Switched Telephone Network (PSTN)) or ISDN (Integrated Services Digital Network) line, and the telephone control device ME is a PSTN or ISDN call via the telephone line L2. It has a function to transmit and receive control signals. In the present embodiment, as the telephone line L2, there are two analog lines, a telephone line L21 having a telephone number “0x-xxx-xx01” and a telephone line L22 having a telephone number “0x-xxx-xx02”. In the following description, it is assumed that the telephone system 20 is connected to the VoIP gateway device 10.

  The IP terminal 30 is an IP telephone terminal connected to the VoIP gateway apparatus 10 via the IP line L3, and is connected to any other telephones (telephone terminals ST1, ST2,. It has a function of making a call with a not-shown).

  In the present embodiment, a pseudo call control unit 15 is provided in the VoIP gateway device 10 connected between the IP telephone network NW and the telephone system 20, and the VoIP gateway device 10 returns the outgoing call from the telephone system 20. By making the incoming call to the telephone system 20, even if the network side line L1 on the IP telephone network NW side cannot be used, the setting contents regarding the external line system of the telephone system 20 are confirmed.

[VoIP gateway device]
Next, with reference to FIG. 1, the VoIP gateway apparatus 10 concerning this Embodiment is demonstrated in detail.
The VoIP gateway apparatus 10 includes a line I / F unit 11, a terminal I / F unit 12, a network side I / F unit 13, a gateway processing unit 14, and a pseudo call control unit 15 as main functional units. Yes.

  The line I / F unit 11 has a function of exchanging call control signals with the telephone system 20 via the telephone line L2. In the present embodiment, the case where the telephone system 20 is compatible with an analog line and the line I / F unit 11 exchanges PSTN call control signals with the telephone control apparatus ME will be described as an example.

  The terminal I / F unit 12 has a function of exchanging call control messages based on SIP (Session Initiation Protocol) with the IP terminal 30 via the IP line L3. In this embodiment, the case where SIP is used as the call control protocol will be described as an example. However, the present invention is not limited to this. Even when other call control protocols such as H.323 are used, the present invention can be similarly applied.

  The network side I / F unit 13 detects whether or not the network side line L1 can be used, and the operation mode of the own device according to the detection result of the availability and the normal mode according to the call control on the IP telephone network NW side. In the normal mode, a call control message based on SIP between the gateway processing unit 14 and the IP telephone network NW is switched to one of the pseudo call control mode according to the call control in the pseudo call control unit 15. In the pseudo call control mode, and a function of exchanging a call control message based on SIP between the gateway processing unit 14 and the pseudo call control unit 15.

  The gateway processing unit 14 receives a call control message exchanged with the IP telephone network NW or the pseudo call control unit 15 via the network side I / F unit 13 and a call exchanged with the telephone system 20 via the line I / F unit 11. By converting protocol between the control signal and the call control message exchanged with the IP terminal 30 via the terminal I / F unit 12, the IP telephone network NW side or the pseudo call control unit 15, the telephone system 20 and It has a function of exchange connection with the IP terminal 30.

The pseudo call control unit 15 performs pseudo call control on the telephone system 20 by exchanging call control messages with the gateway processing unit 14 via the network side I / F unit 13 in the pseudo call control mode. It has a function to do.
The operation mode of the VoIP gateway device 10 may be automatically switched and set by the network side I / F unit 13 according to the availability of the network side line L1, but the setting provided in the VoIP gateway device 10 In accordance with a setting operation from the switch or the IP terminal 30, the worker may switch and set the operation mode of the VoIP gateway device 10.

[Operation of First Embodiment]
Next, the operation of the VoIP gateway device 10 according to the present embodiment will be described with reference to FIG. 2 and FIG. FIG. 2 is an explanatory diagram illustrating an outline of the setting check operation according to the first embodiment. FIG. 3 is a sequence diagram illustrating a setting check operation according to the first embodiment.
Hereinafter, a case will be described in which the operation mode of the VoIP gateway device 10 is switched to the pseudo call control mode and the dial-in function setting content in the telephone system 20 is confirmed using the VoIP gateway device 10. The dial-in function is a function that performs call processing as an incoming call to a specific extension number as an individual call to an associated extension number.

  First, in the telephone control apparatus ME, a construction worker sets an external number “0x-xxx-xx02” and an extension number “# 2” in association with each other as setting contents of the dial-in function (step 100). As a result, the incoming call to the telephone number “0x-xxx-xx02” is controlled as an individual incoming call to the telephone terminal ST2 corresponding to the extension number “# 2”.

Thereafter, in order to confirm the setting contents of the dial-in function, the construction worker captures the telephone line L21 of the telephone number “0x-xxx-xx01” at the telephone terminal ST1 (# 1), and the telephone number of the telephone line L22. When an outside line calling operation to “0x-xxx-xx02” is performed (step 101), the outside line calling operation is notified from the telephone terminal ST1 to the telephone control device ME (step 102).
In response to an external line transmission operation from the telephone terminal ST1, the telephone control device ME captures the telephone line L21 and transmits a telephone number “0x-xxx-xx02” to perform an external line transmission (step 103).

On the other hand, the gateway processing unit 14 of the VoIP gateway device 10 accepts an outside line transmission from the telephone control device ME notified via the line I / F unit 11, and uses the received telephone number “0x-xxx-xx02” as a destination. Is converted into a calling INVITE message and transferred to the network side I / F unit 13 (step 104).
The network side I / F unit 13 exchanges a call control message based on SIP between the gateway processing unit 14 and the pseudo call control unit 15 because the operation mode of the own device is the pseudo call control mode.

  The pseudo call control unit 15 receives the calling INVITE message from the gateway processing unit 14 via the network side I / F unit 13, and the destination corresponds to the telephone number of the telephone system 20 registered in advance. Then, in order to notify the incoming call to the telephone system 20, an incoming call INVITE message with the telephone number “0x-xxx-xx02” is generated and transmitted to the network side I / F unit 13 (step 110). .

  The gateway processing unit 14 receives the INVITE message for incoming call from the pseudo call control unit 15 via the network side I / F unit 13 and receives the telephone line L22 having the telephone number “0x-xxx-xx02” designated as the destination. An outside line incoming call is output from the line I / F unit 11 to the telephone control apparatus ME (step 111).

  The telephone control device ME refers to the setting of the dial-in function in response to the incoming call to the telephone line L22 with the telephone number “0x-xxx-xx02”, and the extension number “0x-xxx-xx02” corresponding to the telephone number “0x-xxx-xx02”. "# 2" is identified (step 112), and the line I / F unit 11 notifies the telephone terminal ST2 corresponding to the extension number "# 2" of the external line individual incoming call (step 113). As a result, the individual incoming call of the outside line is displayed by the LED or the like at the telephone terminal ST2 (step 114).

On the other hand, after sending the incoming INVITE message, the pseudo call control unit 15 returns a 100 Trying message corresponding to the outgoing INVITE message to the gateway processing unit 14 via the network side I / F unit 13 (step 120).
Further, after receiving the incoming INVITE message, the gateway processing unit 14 returns the incoming side 180 Ringing message to the pseudo call control unit 15 via the network side I / F unit 13 (step 121).

The pseudo call control unit 15 returns the calling side 180 Ringing message to the gateway processing unit 14 via the network side I / F unit 13 in response to the called side 180 Ringing message from the gateway processing unit 14 (step 122).
In response to the calling side 180 Ringing message from the pseudo call control unit 15, the gateway processing unit 14 sends an RBT (Ringing Back Tone) from the line I / F unit 11 to the telephone line L21 of the calling side telephone terminal ST1. (Step 123). As a result, the RBT is transmitted from the telephone control device ME to the telephone terminal ST1 via the communication path (step 124), and the RBT is transmitted from the telephone terminal ST1 (step 125).

Thereafter, when the construction operator performs a response operation to the individual incoming call at the telephone terminal ST2 (step 130), the telephone terminal ST2 notifies the telephone control device ME of the incoming call response operation (step 131). .
In response to the external line incoming call response operation from the telephone terminal ST2, the telephone control device ME captures the telephone line L22 of the telephone number “0x-xxx-xx02” and responds to the external line incoming call (step 132).

In response to the incoming line response to the telephone line L22 by the telephone control device ME detected by the line I / F unit 11, the gateway processing unit 14 sends an incoming 200 OK message indicating an incoming call response to the incoming INVITE message to the network side I The data is transferred to the / F unit 13 (step 133).
The pseudo call control unit 15 receives the incoming 200 OK message from the gateway processing unit 14 via the network side I / F unit 13, and sends the outgoing side 200 OK message to the gateway processing unit 14 via the network side I / F unit 13. Return (step 134).

As a result, the telephone terminal ST1 side communication path connected to the telephone line L21 and the telephone terminal ST2 side communication path connected to the telephone line L22 are relay-connected via the gateway processing unit 14, and the telephone terminal A voice call between ST1 and telephone terminal ST2 is started (step 135).
Therefore, the contractor confirms the individual incoming call display to the telephone terminal ST2 according to the setting contents of the dial-in function in response to the outgoing call to the telephone number “0x-xxx-xx02” at the telephone terminal ST1. Furthermore, by confirming a voice call between the telephone terminal ST1 and the telephone terminal ST2 in response to a response operation at the telephone terminal ST2, it is confirmed that the setting contents of the dial-in function are correctly registered.

[Effect of the first embodiment]
As described above, according to the present embodiment, when the pseudo call control unit 15 operates in the pseudo call control mode for confirming the setting contents of the telephone system 20, the pseudo call control unit 15 is connected via the network side I / F unit 13. The telephone system 20 is simulated and controlled by exchanging call control messages with the gateway processing unit 14.
As a result, even when the network line L1 on the IP telephone network NW side cannot be used, the telephone system 20 is controlled in a pseudo manner by the VoIP gateway device 10. For this reason, it is possible to perform setting confirmation for the telephone line L22 by making an external line call from the telephone line L21 of the telephone system 20 to the telephone line L22 accommodated in the own device.

Further, in the present embodiment, the network side I / F unit 13 detects whether or not the network side line L1 is usable, and when the network side line L1 is unavailable, the operation mode of the own apparatus is set to the pseudo call control mode. The call control message may be exchanged between the gateway processing unit 14 and the pseudo call control unit 15. Furthermore, when the network side line L1 is usable, the operation mode of the own apparatus is switched to the normal mode so that a call control message is exchanged between the gateway processing unit 14 and the IP telephone network NW side. May be.
As a result, the operation mode of the own apparatus can be automatically switched between the pseudo call control mode and the normal mode according to the availability of the network side line L1, and the mode switching operation for confirming the setting by the builder is omitted. Can do.

[Second Embodiment]
Next, the VoIP gateway apparatus 10 concerning the 2nd Embodiment of this invention is demonstrated.
In the present embodiment, an outside line transmission from an IP terminal 30 connected to the VoIP gateway device 10 is returned by the VoIP gateway device 10 to be received by the telephone system 20, so that the network side line on the IP telephone network NW side is used. Even if it is not possible, the setting contents regarding the outside line system of the telephone system 20 are confirmed.

[Operation of Second Embodiment]
Next, the operation of the VoIP gateway device 10 according to the present embodiment will be described with reference to FIG. 4 and FIG. FIG. 4 is an explanatory diagram illustrating an outline of the setting check operation according to the second embodiment. FIG. 5 is a sequence diagram illustrating a setting check operation according to the second embodiment.
In the following, the operation mode of the VoIP gateway device 10 is switched to the pseudo call control mode, and the dial-in function setting content in the telephone system 20 is confirmed using the VoIP gateway device 10 and the IP terminal 30. Will be described.

  First, in the telephone control device ME, a construction worker sets an external number “0x-xxx-xx02” and an extension number “# 2” in association with each other as setting contents of the dial-in function (step 200). As a result, the incoming call to the telephone number “0x-xxx-xx02” is controlled as an individual incoming call to the telephone terminal ST2 corresponding to the extension number “# 2”.

  Thereafter, in order to confirm the setting contents of the dial-in function, the builder performs an outside line transmission operation to the telephone number “0x-xxx-xx02” of the telephone line L22 from the IP terminal 30 instead of the telephone terminal ST1 ( Step 201). Thereby, the INVITE message addressed to the telephone number “0x-xxx-xx02” is notified from the IP terminal 30 to the gateway processing unit 14 via the terminal I / F unit 12 (step 202). The calling INVITE message similar to the above is transferred to the network side I / F unit 13 (step 203).

  The pseudo call control unit 15 receives the calling INVITE message from the gateway processing unit 14 via the network side I / F unit 13, and the destination corresponds to the telephone number of the telephone system 20 registered in advance. Then, in order to notify the incoming call to the telephone system 20, an incoming call INVITE message with the telephone number “0x-xxx-xx02” is generated and transmitted to the network side I / F unit 13 (step 210). .

  The gateway processing unit 14 receives the incoming call INVITE message from the pseudo call control unit 15 via the network side I / F unit 13, and the telephone having the designated telephone number “0x-xxx-xx02” designated as the destination. An incoming call to the line L22 is output from the line I / F unit 11 to the telephone control device ME (step 211).

  The telephone control device ME refers to the setting of the dial-in function in response to the incoming call to the telephone line L22 with the telephone number “0x-xxx-xx02”, and the extension number “0x-xxx-xx02” corresponding to the telephone number “0x-xxx-xx02”. "# 2" is identified (step 212), and the line I / F unit 11 notifies the telephone terminal ST2 corresponding to the extension number "# 2" of the external line individual incoming call (step 213). As a result, the individual incoming call of the outside line is displayed by the LED or the like at the telephone terminal ST2 (step 214).

  On the other hand, after sending the incoming INVITE message, the pseudo call control unit 15 returns a 100 Trying message corresponding to the outgoing INVITE message to the gateway processing unit 14 via the network side I / F unit 13 (step 220). As a result, the 100 Trying message is transferred from the gateway processing unit 14 to the IP terminal 30 via the terminal I / F unit 12 (step 221).

Further, after receiving the incoming INVITE message, the gateway processing unit 14 returns the incoming side 180 Ringing message to the pseudo call control unit 15 via the network side I / F unit 13 (step 222).
The pseudo call control unit 15 returns the calling side 180 Ringing message to the gateway processing unit 14 via the network side I / F unit 13 in response to the called side 180 Ringing message from the gateway processing unit 14 (step 223).

  In response to this, the originating 180Ringing message is transferred from the gateway processing unit 14 to the IP terminal 30 via the terminal I / F unit 12 (step 224). As a result, the IP terminal 30 sends an RBT to the speech path in response to the calling side 180 Ringing message from the pseudo call control unit 15 (step 225).

Thereafter, when the construction operator performs a response operation to the individual incoming call on the telephone terminal ST2 (step 230), the telephone terminal ST2 notifies the telephone control device ME of the incoming call response operation (step 231). .
In response to the external line incoming call response operation from the telephone terminal ST2, the telephone control device ME captures the telephone line L22 of the telephone number “0x-xxx-xx02” and responds to the external line incoming call (step 232).

In response to the incoming line response to the telephone line L22 by the telephone control device ME detected by the line I / F unit 11, the gateway processing unit 14 sends an incoming 200 OK message indicating an incoming call response to the incoming INVITE message to the network side I The data is transferred to the / F unit 13 (step 233).
The pseudo call control unit 15 receives the incoming 200 OK message from the gateway processing unit 14 via the network side I / F unit 13, and sends the outgoing side 200 OK message to the gateway processing unit 14 via the network side I / F unit 13. Return (step 234).

As a result, the communication path on the IP terminal 30 side connected to the IP line L3 and the communication path on the telephone terminal ST2 side connected to the telephone line L22 are relay-connected via the gateway processing unit 14 to the IP terminal. 30 and a voice call between the telephone terminal ST2 are started (step 235).
Accordingly, the contractor confirms the individual incoming call display to the telephone terminal ST2 according to the setting contents of the dial-in function in response to the outgoing call to the telephone number “0x-xxx-xx02” at the IP terminal 30. Furthermore, by confirming a voice call between the IP terminal 30 and the telephone terminal ST2 in response to a response operation at the telephone terminal ST2, it is confirmed that the setting contents of the dial-in function are correctly registered.

[Effect of the second embodiment]
As described above, in the present embodiment, the gateway processing unit 14 is connected via the terminal I / F unit 12 when the own apparatus operates in the pseudo call control mode for confirming the setting contents of the telephone system 20. The network side I / F unit 13 is notified of the call control message for outgoing call indicating the outgoing call in response to the call control message indicating the outgoing call to the telephone line L2 sent from the IP terminal 30. The pseudo call control unit 15 performs pseudo call control on the telephone system 20.

  As a result, the telephone system 20 is pseudo-controlled by the VoIP gateway device 10 by making an outside line call from the IP terminal 30 to the telephone line L2 of the telephone system 20. Therefore, even when the telephone line L2 has only one line, it is possible to perform setting confirmation for the telephone line L2.

[Extended embodiment]
The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention. In addition, each embodiment can be implemented in any combination within a consistent range.

  DESCRIPTION OF SYMBOLS 10 ... VoIP gateway apparatus, 11 ... Line I / F part, 12 ... Terminal I / F part, 13 ... Network side I / F part, 14 ... Gateway processing part, 15 ... Pseudo call control part, 20 ... Telephone system, ME ... telephone control device, ST1, ST2, ..., STN ... telephone terminal, 30 ... IP telephone terminal, L1 ... network side line, L2, L21, L22 ... telephone line, L3 ... IP line, LN ... extension line, NW ... IP Telephone network.

Claims (5)

A VoIP gateway device that exchanges and connects a network side line on the IP telephone network side and a plurality of telephone lines on the telephone system side that accommodates a plurality of telephone terminals,
A network side I / F unit that connects to the network side line and exchanges call control messages with the IP telephone network side;
A gateway processing unit that mutually converts a call control signal and the call control message exchanged with the telephone system via the telephone line;
By exchanging the call control message with the gateway processing unit via the network side I / F unit when the own device operates in the pseudo call control mode for confirming the setting contents of the telephone system. And a pseudo call control unit that performs pseudo call control on the telephone system. The VoIP gateway device according to claim 1,
The gateway processing unit is responsive to a call control signal sent from the telephone system to the first telephone line of the telephone lines and indicating an outside line to the second telephone line of the telephone lines. Notifying the network side I / F unit of a call control message for calling indicating external line transmission,
The pseudo call control unit generates an incoming call control message indicating an incoming call to the second telephone line in response to the calling call control message notified through the network side I / F unit. To the network side I / F unit,
The gateway processing unit sends a call control signal indicating an incoming call to the second telephone line in response to the incoming call control message notified via the network side I / F unit. A VoIP gateway device, wherein the VoIP gateway device is sent from a line to the telephone system. In the VoIP gateway device according to claim 1 or 2,
The network side I / F unit detects whether or not the network side line is usable, and when the network side line is unusable, switches the operation mode of the own apparatus to the pseudo call control mode, and sets the gateway A VoIP gateway device that exchanges the call control message between a processing unit and the pseudo call control unit. In the VoIP gateway device according to any one of claims 1 to 3,
The network side I / F unit detects whether or not the network side line is usable, and when the network side line is usable, switches the operation mode of the own apparatus to a normal mode, A VoIP gateway device exchanging the call control message with the IP telephone network side. The VoIP gateway device according to claim 1,
The gateway processing unit transmits the outside line in response to a call control message transmitted from the IP terminal connected via the terminal I / F unit and indicating an outside line to the second telephone line among the telephone lines. A call control message to be sent to the network side I / F unit
The pseudo call control unit generates an incoming call control message indicating an incoming call to the second telephone line in response to the calling call control message notified through the network side I / F unit. To the network side I / F unit,
The gateway processing unit sends a call control signal indicating an incoming call to the second telephone line in response to the incoming call control message notified via the network side I / F unit. A VoIP gateway device, wherein the VoIP gateway device is sent from a line to the telephone system.

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