JP2016092538A - Gateway device and non-response transfer method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gateway device capable of causing charging at a proper timing, and appropriately controlling a singing terminal even when a non-response transfer function is mounted on the gateway device side, and the non-response transfer method thereof.SOLUTION: An HGW 20 comprises an HGW transfer setting storage unit 21A which stores setting information related to a non-response transfer function, a call control unit 22A which controls calls, and a virtual SIP terminal function unit 22B which functions as a virtual terminal. If the non-response transfer function is enabled when receiving an INVITE from an originating terminal 10, the call control unit 22A transmits the INVITE to the virtual SIP terminal function unit 22B. If the non-response transfer function is disabled, the call control unit 22A transmits the INVITE to a terminal 30 under the HGW. When receiving the INVITE from the call control unit 22A, the virtual SIP terminal function unit 22B transmits the INVITE called differently from the INVITE to the terminal 30 under the HGW.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a gateway device such as an HGW (Home Gateway) and a no-response transfer method thereof, and more particularly, to a charging opportunity and a control of a ringing terminal at the time of no-response transfer.

  Conventionally, a “no-response transfer function” is known in which a transfer source telephone is called and transferred when there is no response. For example, Patent Document 1 discloses a transfer service system that can provide a transfer service for transferring an incoming call in a SIP server that controls the start and end of a session by SIP. Further, Patent Document 2 discloses a transfer system capable of changing the media session of early media in a no-response transfer service using a session control server.

JP 2010-251826 A JP 2012-84977 A

  In the prior arts disclosed in Patent Documents 1 and 2, a no-response transfer function is implemented on the network side, but only the internal implementation of the Hikari Telephone router (HGW) is required without special settings on the network side. It is desired to realize a no-response transfer function. However, when the no-response transfer function is implemented on the HGW side, as will be described below, (1) charging is generated on the calling side when the no-response transfer timer expires, (2) the HGW subordinate terminal even after the no-response transfer timer expires There are two problems that keep ringing.

  FIG. 13 is a conceptual diagram when a no-response transfer function is implemented on the HGW 2 side. This shows a case where there is no response even if the HGW subordinate terminal 3 that is a subordinate terminal of the HGW 2 is called for a certain period of time. In such a case, the incoming call is transferred to the transfer partner (external line or extension) 4 by the non-response transfer function of the HGW 2, and the caller 1 and the transfer partner 4 can talk.

  FIG. 14 is a diagram for explaining a problem when the no-response transfer function is implemented on the HGW 2 side.

  First, as shown in FIG. 14 (a), in order to stop ringing of the HGW subordinate terminal 3 after the no-response transfer timer expires, the HGW 2 returns 200 OK to the network side, and charging occurs at that timing. There is. That is, the HGW 2 can stop ringing of the forking destination in response to 200 OK to the caller 1 (see “CANCEL” in the figure).

  On the other hand, as shown in FIG. 14B, when charging is triggered by 200 OK from the transfer partner 4, the HGW 2 stops ringing of the forking destination triggered by 200 OK from the transfer partner 4. (See “CANCEL” in the figure). Therefore, in this case, another problem arises that the HGW subordinate terminal 3 continues to ring even after the no-response transfer timer expires.

  In view of the above-described conventional technology, the present invention can generate a charge at an appropriate timing and can appropriately control a ringing terminal even when a no-response transfer function is implemented on the gateway device side. It is an object of the present invention to provide an apparatus and a method for transferring no response.

  In order to achieve the above object, the invention according to the first aspect is a gateway device in which a no-response transfer function for transferring an incoming call to a transfer destination terminal when a subordinate terminal is called and there is no response is provided, A storage unit that stores setting information related to a no-response transfer function; a call control unit that performs call control; and a virtual terminal function unit that functions as a virtual terminal, wherein the call control unit establishes a call from a source terminal When a request is received, a call establishment request is transmitted to the virtual terminal function unit when the no-response transfer function is valid, and a call establishment request is transmitted to the subordinate terminal when the no-response transfer function is invalid. When the virtual terminal function unit receives a call establishment request from the call control unit, the virtual terminal function unit transmits a call establishment request different from the call establishment request to the subordinate terminal.

  The invention according to a second aspect is the invention according to the first aspect, in which, when the virtual terminal function unit does not receive a successful response from the subordinate terminal before expiration of a preset no-response transfer timer, Requests the subordinate terminal to cancel the call establishment request for another call, transmits a call establishment request to the transfer destination terminal, and receives a success response from the transfer destination terminal, transmits a success response to the source terminal. And establishing a call between the source terminal and the transfer destination terminal by requesting the call control unit to perform path switching processing after establishing a call between the source terminal and the virtual terminal function unit. To do.

  The invention according to a third aspect is the invention according to the first aspect, wherein when the virtual terminal function unit receives a success response from the subordinate terminal before expiration of a preset no-response transfer timer, After establishing a call between the source terminal and the virtual terminal function unit by sending a success response to the source terminal, the call control unit is requested to perform path switching processing and the call between the source terminal and the subordinate terminal Establishing

  In order to achieve the above object, the invention according to the fourth aspect provides a non-response transfer method for a gateway device in which a non-response transfer function for transferring an incoming call to a transfer destination terminal when a subordinate terminal is called and there is no response is implemented. When the gateway device receives a call establishment request from a source terminal, the step of determining whether the no-response transfer function is valid or invalid, and the no-response transfer function is valid Transmitting a call establishment request to a virtual terminal function unit functioning as a virtual terminal and transmitting the call establishment request to the subordinate terminal when the no-response transfer function is invalid; and And a step of transmitting a call establishment request for a call different from the call establishment request to the subordinate terminal when the call establishment request is received.

  According to the present invention, even when a no-response transfer function is implemented on the gateway device side, it is possible to generate a charge at an appropriate timing and to appropriately control a ringing terminal and the no-response transfer thereof It is possible to provide a method.

It is a block diagram of the no-response transfer system in embodiment of this invention. It is a functional block diagram of HGW in an embodiment of the invention. It is a figure which shows the operation example of the no-response transfer system in embodiment of this invention. It is a figure which shows the operation example of the no-response transfer system in embodiment of this invention. It is a figure which shows the operation example of the no-response transfer system in embodiment of this invention. It is a figure which shows the operation example of the no-response transfer system in embodiment of this invention. It is a figure which shows the operation example of the no-response transfer system in embodiment of this invention. It is a sequence diagram (no HGW subordinate terminal response) of a comparative example. It is a sequence diagram (no HGW subordinate terminal response) of the embodiment. It is a sequence diagram (no HGW subordinate terminal response) of the embodiment. It is a sequence diagram (with HGW subordinate terminal response) of an Example. It is a sequence diagram (with HGW subordinate terminal response) of an Example. It is a conceptual diagram at the time of mounting a no-response transfer function on the HGW side. It is a figure for demonstrating the problem at the time of mounting a non-response transfer function on the HGW side, (a) Problem 1 and (b) Problem 2.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following embodiments exemplify a no-response transfer system for embodying the technical idea of the present invention, and the configuration of the apparatus and the configuration of data are limited to the following embodiments. It is not a thing.

(Configuration example of no-response transfer system)
FIG. 1 is a configuration diagram of a no-response transfer system according to an embodiment of the present invention. This no-response transfer system realizes the no-response transfer function only by mounting inside the HGW 20 without performing any special setting on the communication network 50 side. Specifically, the transmission source terminal 10, the HGW 20, the HGW subordinate terminals 30 </ b> A, 30 </ b> B,..., The transfer destination terminal 40, and the communication network 50 are provided.

  The source terminal 10 is a telephone (outside line) that is a source. The HGW 20 is a gateway device such as a Hikari Denwa router, and has a no-response transfer function that calls an HGW subordinate terminal 30A, 30B,... And transfers the incoming call to the transfer destination terminal 40 when there is no response. The HGW subordinate terminals 30A, 30B,... (Hereinafter collectively referred to as “HGW subordinate terminals 30”) are telephones (extensions) connected to the subordinates of the HGW 20. The transfer destination terminal 40 is a telephone (external line or extension) serving as a transfer destination. The communication network 50 is provided with a SIP (Session Initiation Protocol) server.

(Configuration example of HGW)
FIG. 2 is a functional block diagram of the HGW 20 in the embodiment of the present invention. As shown in this figure, the HGW 20 includes a storage unit 21 that stores various types of information, a control unit 22 that performs various types of control, a communication unit 23 that performs communication with a communication network 50, and a terminal 30 that is under the HGW. And an input / output unit 24 such as an analog port for performing input / output between them. The storage unit 21 includes an HGW transfer setting storage unit 21A that stores setting information related to the no-response transfer function. The setting information regarding the no-response transfer function is, for example, information indicating whether the no-response transfer function is valid or invalid, terminal information of the transfer destination terminal 40, and the like. Such setting information is set in advance by the user. The control unit 22 includes a call control unit 22A that performs call control, and a virtual SIP terminal function unit 22B that functions as the virtual HGW subordinate terminal 30. The virtual SIP terminal function unit 22B can be realized by software, for example. The virtual SIP terminal function unit 22B includes a no-response transfer timer T which is a timer function for no-response transfer. The value of the no-response transfer timer T is set in advance by the user.

(Operation example)
3 to 7 are diagrams showing an operation example of the no-response transfer system in the embodiment of the present invention. “INVITE”, “CANCEL”, “200 OK”, and “REFER” shown in the figure are all SIP method names. INVITE (call establishment request) is used for the purpose of establishing a call (session). CANCEL is used for the purpose of ending the establishment process during call setup. 200 OK (success response) is the final response to the request. REFER is used for the purpose of instructing a partner SIP user agent (UA) to send a SIP request to another SIP user agent.

  First, as shown in FIG. 3, when the call control unit 22A of the HGW 20 receives INVITE (dialog = 1) from the caller terminal 10 which is an external terminal via the SIP server 51 in the communication network 50 (S1), Determine whether the no-response transfer function is enabled or disabled. Whether the no-response transfer function is valid or invalid can be determined by referring to the HGW transfer setting storage unit 21A.

  Here, the call control unit 22A transmits INVITE (dialog = 1) to the HGW subordinate terminal 30 when the no-response transfer function is invalid. As a result, the HGW subordinate terminal 30 rings. Since the operation when the no-response transfer function is invalid is not the main point of the present invention, detailed description thereof is omitted here.

  On the other hand, when the no response transfer function is valid, the call control unit 22A transmits INVITE (dialog = 1) only to the virtual SIP terminal function unit 22B. The virtual SIP terminal function unit 22B activates the no-response transfer timer T and transmits INVITE (dialog = 2) to the HGW subordinate terminal 30 as the second call (S2). As a result, the HGW subordinate terminal 30 rings.

  The second call means that INVITE (dialog = 2) is different from INVITE (dialog = 1). “Dialog” is information for identifying a path.

  Thereafter, it is assumed that the virtual SIP terminal function unit 22B has not received 200 OK from the HGW subordinate terminal 30 before the no-response transfer timer T expires. That is, it is assumed that the user does not answer the call even if the transfer source telephone (HGW subordinate terminal 30) is called for a preset time.

  In this case, as shown in FIG. 4, when the no-response transfer timer T expires (S3), the virtual SIP terminal function unit 22B transmits CANCEL (dialog = 2) to the HGW subordinate terminal 30 (S4), and the transfer destination INVITE (dialog = 3) is transmitted to the terminal 40 (S5). As a result, the HGW subordinate terminal 30 stops ringing and the transfer destination terminal 40 rings.

  Next, as shown in FIG. 5, it is assumed that the virtual SIP terminal function unit 22B receives 200 OK (dialog = 3) from the transfer destination terminal 40 (S6). A call between the virtual SIP terminal function unit 22B and the transfer destination terminal 40 is established in response to 200 OK (dialog = 3) from the transfer destination terminal 40. When the virtual SIP terminal function unit 22B receives 200 OK (dialog = 3) from the transfer destination terminal 40 (S6), it transmits 200 OK (dialog = 1) to the source terminal 10 (S7). A call between the virtual SIP terminal function unit 22B and the caller terminal 10 is established in response to 200OK (dialog = 1) from the virtual SIP terminal function unit 22B.

  Next, as shown in FIG. 6, the virtual SIP terminal function unit 22B transmits REFER (dialog = 1) to the call control unit 22A (S8). Thereby, the call control unit 22A establishes a call between the caller terminal 10 and the transfer destination terminal 40. As a result, as shown in FIG. 7, a call between the caller terminal 10 and the transfer destination terminal 40 is established via the call control unit 22A.

  As described above, the call control unit 22A according to the embodiment of the present invention changes the INVITE forking destination depending on whether the no-response transfer function is valid or invalid. That is, when receiving INVITE from the source terminal 10, INVITE from the communication network 50 is distributed to the HGW subordinate terminal 30 and the virtual SIP terminal function unit 22B according to the setting contents of the no-response transfer function. When receiving the INVITE from the call control unit 22A, the virtual SIP terminal function unit 22B transmits the INVITE of another call to the HGW subordinate terminal 30. In this way, if another virtual INVITE is transmitted from the virtual SIP terminal function unit 22B, the CANCEL for the other call INVITE can be transmitted to the HGW subordinate terminal 30 at any timing on the virtual SIP terminal functional unit 22B side. . Therefore, even when the no-response transfer function is implemented on the HGW 20 side, it becomes possible to generate a charge at an appropriate timing, and to appropriately control the ringing terminal.

(Comparative example: No response from terminal under HGW)
FIG. 8 is a sequence diagram of a comparative example. This comparative example is for comparison with the examples described later, and corresponds to FIG. Here, the case where there is no response from HGW subordinate terminal 300A, 300B is demonstrated.

  First, when receiving INVITE (dialog = 1) from the caller terminal 100 which is an external terminal (S101), the call control unit 220A determines whether the no-response transfer function is valid or invalid. When the no-response transfer function is valid, the no-response transfer timer T is activated (S102), and INVITE (dialog = 1) is transmitted to the HGW subordinate terminals 300A and 300B which are extension terminals (S103 → S104). As a result, the HGW subordinate terminals 300A and 300B ring.

  Thereafter, it is assumed that the call control unit 220A has not received 200 OK from the HGW subordinate terminals 300A and 300B before the no-response transfer timer T expires. In this case, after transmitting 200 OK (dialog = 1) to the source terminal 100, CANCEL (dialog = 1) is transmitted to the HGW subordinate terminals 300A and 300B (S105 → S106 → S107 → S108 → S109).

  That is, in order to stop ringing of the HGW subordinate terminals 300A and 300B, it is necessary to transmit CANCEL (dialog = 1) to the HGW subordinate terminals 300A and 300B. However, in order to transmit CANCEL (dialog = 1) to the HGW subordinate terminals 300A and 300B, it is necessary to transmit 200 OK (dialog = 1) to the source terminal 100 in advance. Therefore, according to this comparative example, there is a problem that billing occurs at the timing (S106) when the call control unit 220A returns 200 OK to the communication network side.

  Note that if an attempt is made to generate a charge after 200 OK from the transfer destination terminal 400, another problem arises that the HGW subordinate terminals 300A and 300B continue to ring even after the no-response transfer timer T expires. This is the same as described with reference to FIG.

(Example: No response from terminal under HGW)
9 and 10 are sequence diagrams of the embodiment. This embodiment solves the problem of the comparative example and corresponds to FIGS. Here, the case where there is no response from HGW subordinate terminal 30A, 30B is demonstrated.

  First, when receiving INVITE (dialog = 1) from the caller terminal 10 which is an external terminal (S11), the call controller 22A determines whether the no-response transfer function is valid or invalid. If the no-response transfer function is valid, INVITE (dialog = 1) is transmitted only to the virtual SIP terminal function unit 22B (S12). The virtual SIP terminal function unit 22B activates the no-response transfer timer T (S13) and transmits INVITE (dialog = 2) as a second call to the HGW subordinate terminals 30A and 30B (S14 → S15 → S16).

  Thereafter, it is assumed that the virtual SIP terminal function unit 22B has not received 200 OK from the HGW subordinate terminals 30A and 30B before the no-response transfer timer T expires. In this case, when the no-response transfer timer T expires (S17), CANCEL (dialog = 2) is transmitted to the HGW subordinate terminals 30A and 30B (S18 → S19 → S20), and INVITE (dialog = 3) is transmitted to the transfer destination terminal 40. Is transmitted (S21 → S22).

  Next, it is assumed that the virtual SIP terminal function unit 22B receives 200 OK (dialog = 3) from the transfer destination terminal 40 (S23 → S24). A call between the virtual SIP terminal function unit 22B and the transfer destination terminal 40 is established in response to 200 OK (dialog = 3) from the transfer destination terminal 40 (S25). Upon receiving 200 OK (dialog = 3) from the transfer destination terminal 40 (S24), the virtual SIP terminal function unit 22B transmits 200 OK (dialog = 1) to the source terminal 10 (S26 → S27). A call between the virtual SIP terminal function unit 22B and the caller terminal 10 is established in response to 200OK (dialog = 1) from the virtual SIP terminal function unit 22B (S28).

  Next, the virtual SIP terminal function unit 22B transmits REFER (dialog = 1) to the call control unit 22A (S29). As a result, the call control unit 22A performs path switching processing, and a call between the caller terminal 10 and the transfer destination terminal 40 is established via the call control unit 22A (S30 → S31 → S32 → S33 → S34 → S35 → S36 → S37).

  According to this embodiment, since the INVITE of another call is transmitted from the virtual SIP terminal function unit 22B (S14 → S15 → S16), the CANCEL for the INVITE of the other call is set to an arbitrary value on the virtual SIP terminal function unit 22B side. It can be transmitted to the HGW subordinate terminals 30A and 30B at the timing. Therefore, when the no-response transfer timer T expires, the ringing of the HGW subordinate terminals 30A and 30B can be stopped immediately (S17 → S18 → S19 → S20).

  Further, according to this embodiment, when the virtual SIP terminal function unit 22B receives 200 OK (dialog = 3) from the transfer destination terminal 40, 200 OK (dialog = 1) is transmitted to the source terminal 10 (S24 → S25). → S26 → S27), the communication network 50 side is charged. In other words, it is possible to generate a charge in response to 200 OK from the transfer destination terminal 40.

(Example: HGW subordinate terminal response)
11 and 12 are sequence diagrams of the embodiment. Here, the case where there is a response from the HGW subordinate terminals 30A and 30B will be described.

  The operations (S41 to S46) until the virtual SIP terminal function unit 22B transmits INVITE (dialog = 2) as the second call to the HGW subordinate terminals 30A and 30B are the same as S11 to S16 in FIG. Here, it is assumed that the virtual SIP terminal function unit 22B receives 200 OK from the HGW subordinate terminal 30B via the call control unit 22A before the no-response transfer timer T expires (S47 → S48). Upon receiving 200 OK from the HGW subordinate terminal 30B, the call control unit 22A transmits CANCEL (dialog = 2) to the HGW subordinate terminal 30A (S47 → S49). A call between the virtual SIP terminal function unit 22B and the HGW subordinate terminal 30B is established in response to 200 OK (dialog = 2) from the subordinate terminal 30B of the HGW (S50).

  Subsequent operations are basically the same as those in FIG. That is, when the virtual SIP terminal function unit 22B receives 200 OK (dialog = 2) from the HGW subordinate terminal 30B (S48), it transmits 200 OK (dialog = 1) to the source terminal 10 (S51 → S52). A call between the virtual SIP terminal function unit 22B and the caller terminal 10 is established in response to 200OK (dialog = 1) from the virtual SIP terminal function unit 22B (S53).

  Next, the virtual SIP terminal function unit 22B transmits REFER (dialog = 1) to the call control unit 22A (S54). As a result, the call control unit 22A performs path switching processing, and a call is established between the caller terminal 10 and the HGW subordinate terminal 30B via the call control unit 22A (S55 → S56 → S57 → S58 → S59 → S60 → S61 → S62).

  As described above, the HGW 20 according to the embodiment of the present invention is a gateway device in which a no-response transfer function is implemented that transfers an incoming call to the transfer destination terminal 40 when the HGW subordinate terminal 30 is called and there is no response. The HGW transfer setting storage unit 21A that stores setting information related to the no-response transfer function, the call control unit 22A that performs call control, and the virtual SIP terminal function unit 22B that functions as the virtual HGW subordinate terminal 30 are provided. When the INVITE is received from the caller terminal 10, the call control unit 22A transmits INVITE to the virtual SIP terminal function unit 22B when the no-response transfer function is valid, and HGW when the no-response transfer function is invalid. INVITE is transmitted to the subordinate terminal 30. When the virtual SIP terminal function unit 22B receives INVITE from the call control unit 22A, the virtual SIP terminal function unit 22B transmits INVITE of a call different from the INVITE to the HGW subordinate terminal 30. Accordingly, CANCEL for INVITE of another call can be transmitted to the HGW subordinate terminal 30 at an arbitrary timing on the virtual SIP terminal function unit 22B side. Therefore, even when the no-response transfer function is implemented on the HGW 20 side, it becomes possible to generate a charge at an appropriate timing, and to appropriately control the ringing terminal.

  Specifically, if the virtual SIP terminal function unit 22B does not receive 200 OK from the HGW subordinate terminal 30 before the preset no-response transfer timer T expires, the virtual SIP terminal functional unit 22B cancels the CANCEL for INVITE of another call to the HGW subordinate terminal 30. , Send INVITE to the transfer destination terminal 40, and receive 200 OK from the transfer destination terminal 40, send 200 OK to the call origination terminal 10 to call the call origination terminal 10 and the virtual SIP terminal function unit 22B. After the establishment, the call control unit 22A is requested to perform path switching processing to establish a call between the caller terminal 10 and the transfer destination terminal 40. As a result, when there is no response from the HGW subordinate terminal 30, it is possible to stop the ringing of the HGW subordinate terminal 30 when the no-response transfer timer T expires, and to generate a charge when triggered by 200 OK from the transfer destination terminal 40 It is.

  Further, when the virtual SIP terminal function unit 22B receives 200 OK from the HGW subordinate terminal 30 before expiration of the preset no-response transfer timer T, the virtual SIP terminal function unit 22B transmits 200 OK to the source terminal 10 and the source terminal 10 After establishing a call with the virtual SIP terminal function unit 22B, the call control unit 22A is requested to perform a path switching process to establish a call between the source terminal 10 and the HGW subordinate terminal 30. That is, when there is a response from the HGW subordinate terminal 30, it is possible to establish a call between the caller terminal 10 and the HGW subordinate terminal 30 by an appropriate procedure.

  The non-response transfer method according to the embodiment of the present invention is the non-response transfer method of the HGW 20 in which the non-response transfer function for transferring the incoming call to the transfer destination terminal 40 when the terminal under the HGW is called and there is no response is implemented. In the method, when the HGW 20 receives INVITE from the source terminal 10, a step of determining whether the no-response transfer function is valid or invalid, and a virtual response when the no-response transfer function is valid When INVITE is transmitted to the virtual SIP terminal function unit 22B functioning as the HGW subordinate terminal 30 and the no-response transfer function is invalid, the step of transmitting INVITE to the HGW subordinate terminal 30 and the virtual SIP terminal function unit 22B performs INVITE. If received, it includes a step of transmitting an INVITE of a call different from the INVITE to the HGW subordinate terminal 30. Accordingly, CANCEL for INVITE of another call can be transmitted to the HGW subordinate terminal 30 at an arbitrary timing on the virtual SIP terminal function unit 22B side. Therefore, even when the no-response transfer function is implemented on the HGW 20 side, it becomes possible to generate a charge at an appropriate timing, and to appropriately control the ringing terminal.

  The present invention can be realized not only as the HGW 20 or its no-response transfer method, but also as a no-response transfer program that causes a computer to execute each step included in this no-response transfer method. It goes without saying that such a program can be distributed via a recording medium such as a CD-ROM or a transmission medium such as the Internet.

10 ... Source terminal 20 ... HGW (gateway device)
21A: HGW transfer setting storage unit (storage unit)
22A: Call control unit 22B: Virtual SIP terminal function unit (virtual terminal function unit)
30, 30A, 30B ... HGW subordinate terminal (subordinate terminal)
40: Transfer destination terminal T: No response transfer timer

In order to achieve the above object, the invention according to the first aspect is a gateway device in which a no-response transfer function for transferring an incoming call to a transfer destination terminal when a subordinate terminal is called and there is no response is provided, A storage unit that stores setting information related to a no-response transfer function; a call control unit that performs call control; and a virtual terminal function unit that functions as a virtual terminal, wherein the call control unit establishes a call from a source terminal When a request is received, a call establishment request is transmitted to the virtual terminal function unit when the no-response transfer function is valid, and a call establishment request is transmitted to the subordinate terminal when the no-response transfer function is invalid. When the virtual terminal function unit receives a call establishment request from the call control unit , the virtual terminal function unit transmits a call establishment request for a call different from the call establishment request to the subordinate terminal. No response set If a success response is not received from the subordinate terminal before the transmission timer expires, the subordinate terminal requests cancellation of the call establishment request for the other call, transmits a call establishment request to the transfer destination terminal, and transfers the transfer When a success response is received from the destination terminal, a success response is transmitted to the source terminal to establish a call between the source terminal and the virtual terminal function unit, and then a path switching process is requested to the call control unit. The gist is to establish a call between the source terminal and the transfer destination terminal .
The invention according to the second aspect is a gateway device in which a no-response transfer function for transferring an incoming call to a transfer destination terminal when a subordinate terminal is called and there is no response is provided, and setting information relating to the no-response transfer function A storage unit, a call control unit that performs call control, and a virtual terminal function unit that functions as a virtual terminal, and when the call control unit receives a call establishment request from a source terminal, When the no-response transfer function is valid, a call establishment request is transmitted to the virtual terminal function unit, and when the no-response transfer function is invalid, a call establishment request is transmitted to the subordinate terminal, and the virtual terminal function unit When a call establishment request is received from the call control unit, a call establishment request different from the call establishment request is transmitted to the subordinate terminal, and the virtual terminal function unit is configured with a preset no-response transfer timer Before the expiration of When a success response is received from a lower terminal, a success response is transmitted to the source terminal to establish a call between the source terminal and the virtual terminal function unit, and then a path switching process is requested to the call control unit. The gist is to establish a call between the source terminal and the subordinate terminal.
The invention according to the third aspect is a non-response transfer method of a gateway device in which a non-response transfer function for transferring an incoming call to a transfer destination terminal when a subordinate terminal is called and there is no response, the gateway device When receiving a call establishment request from a source terminal, determining whether the no-response transfer function is valid or invalid; and functioning as a virtual terminal when the no-response transfer function is valid A call establishment request is transmitted to the virtual terminal function unit, and when the non-response transfer function is invalid, a step of transmitting a call establishment request to the subordinate terminal, and when the virtual terminal function unit receives the call establishment request And a step of transmitting a call establishment request for a call different from the call establishment request to the subordinate terminal, wherein the virtual terminal function unit is configured to send the subordinate end before expiration of a preset no-response transfer timer. If the success response is not received from the subordinate terminal, the subordinate terminal is requested to cancel the call establishment request for the other call, the call establishment request is transmitted to the transfer destination terminal, and the success response is received from the transfer destination terminal. After transmitting a success response to the source terminal to establish a call between the source terminal and the virtual terminal function unit, the call control unit is requested to perform path switching processing and the source terminal and the transfer destination terminal Establish a call with
This is the gist.
The invention according to the fourth aspect is a non-response transfer method for a gateway device in which a non-response transfer function for transferring an incoming call to a transfer destination terminal when a subordinate terminal is called and there is no response, the gateway device When receiving a call establishment request from a source terminal, determining whether the no-response transfer function is valid or invalid; and functioning as a virtual terminal when the no-response transfer function is valid A call establishment request is transmitted to the virtual terminal function unit, and when the non-response transfer function is invalid, a step of transmitting a call establishment request to the subordinate terminal, and when the virtual terminal function unit receives the call establishment request And a step of transmitting a call establishment request for a call different from the call establishment request to the subordinate terminal, wherein the virtual terminal function unit is configured to send the subordinate end before expiration of a preset no-response transfer timer. If a success response is received from the caller terminal, a success response is transmitted to the caller terminal to establish a call between the caller terminal and the virtual terminal function unit. The gist is to establish a call between a source terminal and the subordinate terminal.

Claims (4)

A gateway device that implements a no-response transfer function that transfers an incoming call to a transfer destination terminal when a subordinate terminal is called and there is no response,
A storage unit for storing setting information related to the no-response transfer function;
A call control unit for performing call control;
A virtual terminal function unit that functions as a virtual terminal,
When the call control unit receives a call establishment request from a source terminal, the call control unit transmits a call establishment request to the virtual terminal function unit when the no-response transfer function is valid, and the no-response transfer function is invalid. When there is, send a call establishment request to the subordinate terminal,
When the virtual terminal function unit receives a call establishment request from the call control unit, the virtual terminal function unit transmits a call establishment request different from the call establishment request to the subordinate terminal.   If the virtual terminal function unit does not receive a successful response from the subordinate terminal before expiration of a preset no-response transfer timer, the virtual terminal function unit requests the subordinate terminal to cancel the call establishment request for the other call, and After sending a call establishment request to the transfer destination terminal and receiving a success response from the transfer destination terminal, after sending a success response to the call origination terminal and establishing a call between the call origination terminal and the virtual terminal function unit 2. The gateway device according to claim 1, wherein the call control unit is requested to perform path switching processing to establish a call between the source terminal and the transfer destination terminal.   When the virtual terminal function unit receives a success response from the subordinate terminal before expiration of a preset no-response transfer timer, the virtual terminal function unit transmits a success response to the source terminal and transmits the source terminal and the virtual terminal function 2. The gateway device according to claim 1, wherein, after establishing a call with a communication unit, the call control unit is requested to perform path switching processing to establish a call between the source terminal and the subordinate terminal. A non-response transfer method for a gateway device in which a non-response transfer function for transferring an incoming call to a transfer destination terminal when a subordinate terminal is called and there is no response,
When the gateway device receives a call establishment request from a source terminal, determining whether the no-response transfer function is valid or invalid;
When the no-response transfer function is valid, a call establishment request is transmitted to the virtual terminal function unit functioning as a virtual terminal. When the no-response transfer function is invalid, a call establishment request is transmitted to the subordinate terminal. And steps to
When the virtual terminal function unit receives a call establishment request, the virtual terminal function unit includes a step of transmitting a call establishment request for a call different from the call establishment request to the subordinate terminal.

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