JP2018011205A - Gateway device and transfer method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exclude a redundant route for transmitting/receiving voice data.SOLUTION: A basic point GW device 120 includes a call connection association determination section 126. The basic point GW device associates a first call connection request being a connection request that is transmitted from one terminal device included in multiple terminal devices connected to a first network and is requested to one outside line device included in multiple outside line devices connected to a second network with a second call connection request generated in an exchange server connected to the second network on the basis of the first call connection request. Then, the device identifies the one terminal device being a transmission source of the first call connection request and the one outside line device being a destination of a third call connection request on the basis of correspondence between the second call connection request and the third call connection request generated based on the second call connection request with the one outside line device as a destination. Then, the device allows a router function section 129 to transfer voice data between the one terminal device and the one outside line device.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a gateway device and a transfer method, and more particularly to a gateway device and a transfer method in a network to which an exchange server that provides a telephone exchange service is connected.

2. Description of the Related Art Conventionally, there is a communication system using a cloud PBX (Private Branch eXchange) server that provides an extension exchange function and an outside line connection function via the Internet (see, for example, Patent Document 1).
Since such a communication system can use an extension call by paying a service usage fee without purchasing an expensive exchange device, the initial introduction cost is low. For this reason, the use of such a communication system is expanding especially in small and medium-sized companies.

Japanese Patent Laying-Open No. 2015-103837

When using a communication system using a cloud PBX server, there are cases where the cloud PBX server itself accommodates a line for an external line call and cases where a line for an external line call is accommodated at each site using the cloud PBX service. .
In the case of the former, it is easy to introduce because there is no need for a line for an outside line call at each site. However, in the former case, the external telephone number is determined by the location of the cloud PBX server, and it is difficult to make correspondence between each base used via the Internet and the external telephone number. For example, when the cloud PBX server is in Tokyo, an outside line number starting with 03 is assigned, but each base exists in a district other than Tokyo, and usually an outside line number starting with another number is assigned.
In the latter case, it is necessary to draw an external line for communication at each site, which is troublesome to introduce. However, in the latter case, a telephone number reflecting the location of each base can be used, so there is a certain demand for corporate users.

When a line for an external line call is prepared at each base, when using an external line call from an internal telephone terminal in the base, a terminal, a base GW (GateWay) device (external line communication line accommodating device), the Internet, a cloud PBX server The call connection control and IP packet of voice data are transferred through redundant routes of the base GW apparatus and the external line server.
The IP packet for call connection control is inevitably routed through a cloud PBX server that provides an exchange function. However, IP packets of voice data are eliminated by eliminating redundant routes and transferred through simple routes such as terminals, base GW devices, and external line servers, thereby improving voice quality degradation due to transfer delay and packet loss. Alternatively, avoidance is possible, and the processing load of the cloud PBX server can be reduced.
However, in order to eliminate the redundant route, the base GW apparatus must correspond to the call forwarded to the terminal, the base GW apparatus, and the cloud PBX server and the call forwarded to the cloud PBX server, the base GW apparatus, and the external line server. It is necessary to determine.

  Accordingly, an object of the present invention is to eliminate redundant paths for transmitting and receiving audio data.

  A gateway device according to a first aspect of the present invention is a gateway device connected to a first network to which a plurality of terminal devices are connected, and to a second network to which an exchange server and a plurality of external line devices are connected. A first interface that communicates with the first network, a second interface that communicates with the second network, and one terminal device included in the plurality of terminal devices, When the first interface receives a first call connection request that is a connection request to one external line device included in a plurality of external line devices, the first call connection request is transferred from the second interface to the exchange server. And the second interface receives the second call connection request generated by the exchange server based on the first call connection request. And generating a third call connection request destined for the one external line device based on the second call connection request, associating the second call connection request with the third call connection request, and The second call connection associated with the connection adapter unit by associating the connection adapter unit that transmits the three-call connection request from the second interface with the first call connection request and the second call connection request. Based on the request and the third call connection request, the one terminal device that is the transmission source of the first call connection request and the one external line device that is the destination of the third call connection request are identified, A call connection correspondence determining unit that causes the router function unit to transfer voice data between the one terminal device and the one external line device.

  A gateway device according to a second aspect of the present invention is a gateway device connected to a first network to which a plurality of terminal devices are connected, and to a second network to which an exchange server and a plurality of external line devices are connected. Transmitted from a first interface that communicates with the first network, a second interface that communicates with the second network, and an external device included in the plurality of external devices, When the second interface receives a first call connection request that is a connection request to one terminal device included in a plurality of terminal devices, a second is transmitted to the exchange server based on the first call connection request. Generate a call connection request, associate the first call connection request with the second call connection request, and transmit the second call connection request from the second interface And when the second interface receives a third call connection request generated by the exchange server based on the second call connection request and destined for the one terminal device. The connection adapter unit associates the router function unit that transfers the call connection request from the first interface to the one terminal device by associating the second call connection request and the third call connection request. Based on the first call connection request and the second call connection request, the one external line device that is the transmission source of the first call connection request and the one terminal device that is the destination of the third call connection request And a call connection correspondence determining unit that causes the router function unit to transfer voice data between the one external line device and the one terminal device.

  The transfer method according to the first aspect of the present invention includes a first interface for communicating with a first network to which a plurality of terminal devices are connected, a second interface to which an exchange server and a plurality of external line devices are connected. A transfer method performed by a gateway device including a second interface that communicates with a network, and transmitted from one terminal device included in the plurality of terminal devices, and one external line included in the plurality of external line devices When the first interface receives a first call connection request that is a connection request to a device, the first call connection request is transferred from the second interface to the exchange server, and based on the first call connection request. When the second interface receives the second call connection request generated by the exchange server, the one external line device is designated as the destination based on the second call connection request. A third call connection request is generated, the second call connection request and the third call connection request are associated with each other, and the third call connection request is transmitted from the second interface, and the first call connection request and the third call connection request are transmitted. By associating the second call connection request, based on the associated second call connection request and the third call connection request, the one terminal device that is the transmission source of the first call connection request The third call connection request is identified as the one external line device, and voice data is transferred between the one terminal device and the one external line device.

  The transfer method according to the second aspect of the present invention includes a first interface for communicating with a first network to which a plurality of terminal devices are connected, a second interface to which an exchange server and a plurality of external line devices are connected. A transfer method performed by a gateway device including a second interface that communicates with a network, the terminal device being transmitted from one external line device included in the plurality of external line devices and included in the plurality of terminal devices When the second interface receives a first call connection request that is a connection request to a device, a second call connection request to be transmitted to the exchange server is generated based on the first call connection request, and the first call connection request is generated. The call connection request and the second call connection request are associated with each other, the second call connection request is transmitted from the second interface, and the exchange server is based on the second call connection request. When the second interface receives the generated third call connection request destined for the one terminal device, the third call connection request is transferred from the first interface to the one terminal device, and By associating the second call connection request and the third call connection request, based on the associated first call connection request and the second call connection request, the transmission source of the first call connection request Identifying the one external line device and the one terminal device that is the destination of the third call connection request, and transferring voice data between the one external line device and the one terminal device It is characterized by.

  According to one embodiment of the present invention, it is possible to eliminate redundant routes for transmitting and receiving voice data by determining call correspondence.

1 is a schematic diagram showing an overall configuration of a communication system according to Embodiments 1 and 2. FIG. FIG. 7 is a schematic diagram showing a modification of the communication system according to Embodiments 1 and 2. 6 is a schematic diagram for explaining registration processing in the communication system according to Embodiment 1. FIG. It is the schematic of the whole structure of the communication system in the existing technology. It is the schematic for demonstrating the transfer path | route of the audio | voice data in the existing technology. 6 is a schematic diagram for explaining an optimal transfer path in the communication system according to Embodiment 1. FIG. 3 is a functional block diagram of a base GW apparatus according to Embodiments 1 and 2. FIG. (A) And (B) is the schematic which shows the hardware structural example of the connection adapter part in Embodiment 1 and 2, a call control extraction part, a call connection corresponding | compatible determination part, and a router function part. In Embodiment 1, it is a sequence diagram which shows the process regarding the call connection at the time of performing outside line connection from a terminal device. FIG. 5 is a sequence diagram illustrating a process related to call connection when performing external line connection from an external line connection terminal to a terminal device in the first embodiment. FIG. 11 is a sequence diagram (part 1) illustrating a process of transferring an external line connection from a terminal apparatus connected to the external line to the terminal apparatus. It is a sequence diagram (the 2) which shows the process which transfers an outside line connection from the terminal device in an outside line connection to a terminal device. FIG. 11 is a sequence diagram (part 3) illustrating a process of transferring an external line connection from the terminal apparatus connected to the external line to the terminal apparatus. FIG. 10 is a sequence diagram (part 4) illustrating a process of transferring an external line connection from the terminal apparatus connected to the external line to the terminal apparatus. In Embodiment 2, it is a sequence diagram which shows the process regarding the call connection at the time of performing outside line connection from a terminal device. In Embodiment 2, it is a sequence diagram which shows the process regarding the call connection at the time of performing an external line connection from an external line connection terminal to a terminal device.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below.
FIG. 1 is a schematic diagram showing an overall configuration of a communication system 100 according to the first embodiment.
The communication system 100 includes terminal apparatuses 110A and 110B, a base GW apparatus 120 as a gateway apparatus, a cloud PBX server 130 as an exchange server, and an external telephone server 140. Hereinafter, the terminal devices 110 </ b> A and 110 </ b> B are referred to as terminal devices 110 when it is not necessary to distinguish between them.

The terminal device 110 and the base GW device 120 are connected to a LAN (Local Area Network) 101.
The base GW apparatus 120 is also connected to the carrier network 102 and can communicate with the cloud PBX server 130 via the carrier network 102 and the Internet 103. The base GW apparatus 120 can also communicate with the external telephone server 140 via the carrier network 102.
Here, the LAN 101 is also referred to as a first network, and the carrier network 102 and the Internet 103 are also referred to as a second network.

The base GW apparatus 120 can connect a plurality of terminal apparatuses 110A and 110B to the LAN 101 side, and can connect to the Internet 103 via a carrier network 102 provided by a communication carrier on the WAN (Wide Area Network) side.
The base GW apparatus 120 has a routing function capable of transferring a communication packet transmitted from the terminal apparatus 110 to the WAN side, or vice versa, from the WAN side to the terminal apparatus 110. Further, the base GW apparatus 120 provides an external line connection adapter function that relays a connection request from the cloud PBX server 130 to the external line or a connection request from the external line to the cloud PBX server 130, assuming the cloud PBX server 130 as a terminal. A connection adapter unit 121 is provided.

A cloud PBX server 130 connected to the base GW apparatus 120 via the Internet 103 accommodates terminal apparatuses 110 at a plurality of bases, and realizes an extension call function between the terminal apparatuses 110.
When the cloud PBX server 130 receives an external line transmission request from the terminal device 110, the cloud PBX server 130 transmits the external line transmission request to the connection adapter unit 121 determined in advance for each terminal device 110 and is connected by the connection adapter unit 121. An exchange function between an external line call and an internal line call between the terminal device 110 is provided.
Conversely, when there is an incoming call from the outside line to each site, the connection adapter unit 121 connects the outside line call to the cloud PBX server 130 based on information registered in advance at the called number. The cloud PBX server 130 establishes an extension call to the terminal device 110 registered in advance in the incoming call number for the incoming call received from the connection adapter unit 121, and provides an exchange function between the external call and the extension call. provide.

  The external telephone server 140 provides an exchange function for a telephone service that uses telephone numbers such as 0AB-J numbers and 050 numbers provided by a communication carrier. FIG. 1 shows a case where the external telephone server 140 is directly connected to the carrier network 102, but the external telephone server 140 is connected to the Internet 103 as in the communication system 100 # shown in FIG. It may be.

Next, registration processing performed prior to a call in the communication system 100 will be described.
FIG. 3 is a schematic diagram for explaining a registration process in the communication system 100.
First, prior to a call, the terminal device 110 registers with the cloud PBX server 130 having an exchange function (S1). The terminal device 110 registers the extension number used by the own device, the communication address of the own device, and the like in the cloud PBX server 130 as a set. When the cloud PBX server 130 receives a connection request to a certain number, the cloud PBX server 130 determines a communication address of the terminal device 110 to which the connection request is to be transferred based on information registered from the terminal device 110, and sends a connection request to the terminal device 110. Can be connected.

  Also, the cloud PBX server 130 registers with the connection adapter unit 121 (S2). For example, the cloud PBX server 130 registers an external line telephone number used in an external line call, a communication address of the own apparatus, and the like in the connection adapter unit 121 as a set. Based on the information registered from the cloud PBX server 130, the connection adapter unit 121 can connect the incoming external line connection request to the cloud PBX server 130 according to the destination telephone number.

  In addition, the connection adapter unit 121 registers with the external line telephone server 140 (S3). The connection adapter unit 121 registers the external line telephone number, the communication address of the local apparatus, and the like that need to be relayed by the local apparatus in the external line telephone server 140 as a set. The external line telephone server 140 can exchange an external line call based on the information registered from the connection adapter unit 121.

Next, an operation for starting an outside line call from a terminal device in the existing technology will be described.
FIG. 4 is a schematic diagram of the overall configuration of the communication system 10 in the existing technology.
The communication system 10 includes terminal apparatuses 11A and 11B, a base GW apparatus 12, a cloud PBX server 13, and an external line telephone server 14.
The terminal device 11 and the base GW device 12 are connected to the LAN 101.
The base GW apparatus 12 is also connected to the carrier network 102 and can communicate with the cloud PBX server 13 via the carrier network 102 and the Internet 103. The base GW apparatus 12 can also communicate with the external line telephone server 14 via the carrier network 102.

Here, it is assumed that the registration operation described with reference to FIG. 3 has been completed for the terminal device 11A, the connection adapter unit 12A, and the external line telephone server 14.
First, a connection request addressed to an external line number is transmitted from the terminal device 11 </ b> A to the cloud PBX server 13.

When the cloud PBX server 13 receives the external line connection request from the terminal device 11A, the cloud PBX server 13 transmits the connection request to the connection adapter unit 12A and stores the correspondence with the connection request received from the terminal device 11A.
When the connection adapter unit 12 </ b> A receives the connection request from the cloud PBX server 13, the connection adapter unit 12 </ b> A transmits the connection request to the external telephone server 14 and stores the correspondence with the connection request received from the cloud PBX server 13.

The external line telephone server 14 transmits a connection request to the terminal device of the destination telephone number or another external line connection server registered in accordance with the destination telephone number. Here, description will be made assuming that a connection request is transmitted to the terminal device having the destination telephone number.
When the external telephone server 14 receives a signal indicating connection permission from the terminal device corresponding to the destination telephone number as a response, it responds to the connection adapter unit 12A.
When the connection adapter unit 12 </ b> A receives the connection permission signal from the external telephone server 14, the connection adapter unit 12 </ b> A determines the connection with the corresponding cloud PBX server 13 and then responds to the cloud PBX server 13 with the connection permission signal.

When the cloud PBX server 13 receives the connection permission signal from the connection adapter unit 12A as a response, the cloud PBX server 13 determines the connection with the corresponding terminal device 11A and then returns a connection request permission signal to the terminal device 11A.
When the terminal device 11A receives the connection permission signal from the cloud PBX server 13 as a response, the terminal device 11A establishes a call for an external line call and starts transmission / reception of the voice data for the call.

  As shown in FIG. 4, in this case, the call connection C1 between the terminal device 11A and the cloud PBX server 13 and the call connection between the cloud PBX server 13 and the connection adapter unit 12A in the base GW device 12 are performed. A total of three call connections of C2 and call connection C3 between the connection adapter unit 12A and the external telephone server 14 are established. The cloud PBX server 13 manages the correspondence between the two terminated call connections C1 and C2, and the connection adapter unit 12A manages the correspondence between the two terminated call connections C2 and C3. .

  As shown in FIG. 5, the path through which the call voice data is transferred by such a call connection is the terminal device 11 </ b> A, the base GW apparatus 12, the cloud PBX server 13, and the connection adapter in the base GW apparatus 12. The route R1 is the part 12A and the outside call destination. As can be seen from the transfer path shown in FIG. 5, the part that reciprocates between the base GW apparatus 12 and the cloud PBX server 13 is a redundant path for data transfer.

  For this reason, in the communication system 100 according to the first embodiment, the base GW apparatus 120 is connected to the call connection C1 shown in FIG. 4 so that the voice data can be transferred through the optimum transfer route R2 shown in FIG. And the call connection C2 is determined, and based on this, necessary conversion is performed on the voice data IP packet, and then the voice data IP packet transmitted from the terminal device 110A is directly transferred to the outside line call side. It can be so.

FIG. 7 is a functional block diagram of base GW apparatus 120 in the first embodiment.
The base GW apparatus 120 includes a connection adapter unit 121, a call control extraction unit 125, a call connection correspondence determination unit 126, a LAN port 127, a WAN port 128, and a router function unit 129.

  The connection adapter unit 121 includes a UAC (User Agent Client) function unit 122, a UAS (User Agent Server) function unit 123, and a B2B-UA (Back-to-back User Agent) function unit 124.

As described with reference to FIG. 3, the UAC function unit 122 performs registration with the external line telephone server 140 and performs call control with the external line telephone server 140.
As described using FIG. 3, the UAS function unit 123 receives registration from the cloud PBX server 130 and performs call control with the cloud PBX server 130.
When the UAS function unit 123 receives an external line connection request from the cloud PBX server 130, the UAS function unit 123 notifies the call connection correspondence determination unit 126 of the content of the received external line connection request and the reception time.

  The B2B-UA function unit 124 stores a correspondence relationship between the call connection performed by the UAC function unit 122 and the call connection performed by the UAS function unit 123, and provides an exchange function between corresponding call connections. For example, the B2B-UA function unit 124 stores the correspondence relationship of the call connection in the correspondence relationship storage unit 124a.

The base GW apparatus 120 does not terminate the first call connection between the terminal apparatus 110 and the cloud PBX server 130 and performs transfer (routing) at the IP level. On the other hand, the base GW apparatus 120 performs termination processing for the second call connection between the cloud PBX server 130 and the connection adapter unit 121 and the third call connection between the connection adapter unit 121 and the external telephone server 140. I do. In order to take a correspondence between the first call connection and the second call connection, it is necessary to make a copy of the call control packet related to the first call connection and to make a determination in combination with the contents of the call control packet related to the second call connection. .
Therefore, the call control extraction unit 125 acquires a copy of the call control packet related to the first call connection, and provides the call connection correspondence determination unit 126 with the copy.
The call connection correspondence determination unit 126 determines the association between the first call connection and the second call connection. For example, the call connection correspondence determination unit 126 uses the content of the copy of the call control packet given from the call control extraction unit 125 and the content of the call control packet related to the second call connection terminated in the connection adapter unit 121. The call control association is determined.

The LAN port 127 is a first interface for connecting to the LAN 101.
The WAN port 128 is a second interface for connecting to the carrier network 102.
The router function unit 129 uses the LAN port 127 and the WAN port 128 to transfer IP packets. The router function unit 129 has a filtering function of a normal IP router and a conversion function of NAT (Network Address Translation) and NAPT (Network Address Port Translation).

  A part or all of the connection adapter unit 121, the call control extraction unit 125, the call connection correspondence determination unit 126, and the router function unit 129 described above may be, for example, a memory as illustrated in FIG. 160 and a processor 161 such as a CPU (Central Processing Unit) that executes a program stored in the memory 160. Such a program may be provided through a network, or may be provided by being recorded on a recording medium.

  In addition, a part or all of the connection adapter unit 121, the call control extraction unit 125, the call connection correspondence determination unit 126, and the router function unit 129 may be a single circuit, as illustrated in FIG. 8B, for example. The processing circuit 162 such as a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuits), or an FPGA (Field Programmable Gate Array) may be used.

FIG. 9 is a sequence diagram illustrating a process related to call connection when performing external line connection from the terminal device 110 in the first embodiment.
First, the terminal device 110 transmits a first external line connection request, which is a connection request addressed to an external line number, to the cloud PBX server 130 (S10). The router function unit 129 of the base GW apparatus 120 transfers the first external line connection request received at the LAN port 127 from the WAN port 128 to the cloud PBX server 130. Here, it is assumed that the outside line number is the telephone number of the outside line connection terminal 150. For this reason, the first external line connection request is a connection request to the external line connection terminal 150.

  When the router function unit 129 transfers the first external line connection request from the terminal device 110 to the cloud PBX server 130, the call control extraction unit 125 of the base GW apparatus 120 copies the content of the first external line connection request, The contents and the reception time are notified to the call connection correspondence determination unit 126 (S11).

  The call connection correspondence determination unit 126 examines the content of the first external line connection request received from the call control extraction unit 125 and, when determining from the destination telephone number that the request is an external line connection request, starts the external line timer for a predetermined time T. (S12). The external line timer is a timer that is activated for a certain time T. The call connection correspondence determination unit 126 determines whether or not a second external line connection request corresponding to the first external line connection request is received within a predetermined time T using an external line timer.

When the cloud PBX server 130 receives the first external line connection request from the terminal device 110, the cloud PBX server 130 generates a second external line connection request, which is a connection request to be transmitted to the connection adapter unit 121, based on the first external line connection request. The correspondence between the 1 external line connection request and the second external line connection request is stored (S13). For example, the cloud PBX server 130 stores the identifier of the first external line connection request and the identifier of the second external line connection request in association with each other.
Then, the cloud PBX server 130 transmits a second external line connection request to the connection adapter unit 121 (S14).

When the WAN port 128 receives the second external line connection request from the cloud PBX server 130, the UAS function unit 123 of the connection adapter unit 121 displays the content and the reception time of the received second external line connection request as a call connection correspondence determination unit. 126 is notified (S15).
The call connection correspondence determination unit 126 compares the destination telephone numbers of all the first external line connection requests during activation of the external line timer with the destination telephone numbers of the second external line connection requests received from the connection adapter unit 121, and determines the destination telephone number. It is determined whether there is a first external line connection request that matches.

Here, when the destination telephone number of the second external line connection request is an external line number and there are a plurality of matching first external line connection requests, the call connection correspondence determination unit 126 does not perform any special processing and performs normal processing. It is assumed that the voice data is transferred through the route.
On the other hand, when the destination telephone number of the second external line connection request is an external line number and there is only one matching first external line connection request, the call connection correspondence determination unit 126 determines these as the corresponding call connection. The first external line connection request and the second external line connection request are associated with each other. Then, the call connection correspondence determination unit 126 sets the IP packet conversion setting in the router function unit 129 so that the base GW apparatus 120 can optimize the route shown in FIG. 6 (S16).

  For example, the call connection correspondence determination unit 126 uses the communication address of the terminal device 110 that has transmitted the first external line connection request as the transfer destination of the IP packet of the voice data, and the communication of the external line connection terminal 150 that is the destination of the second external line connection request. Set the address. Usually, since the communication address of the external line connection terminal 150 is notified by a third external line connection response in step S21 described later, for example, the call connection correspondence determination unit 126 performs the third external line from the UAC function unit 122 after step S21. While receiving the notification of the contents of the connection response, the second external line connection request corresponding to the third external line connection response is identified based on the correspondence stored in the B2B-UA function unit 124, and the identified second external line connection The setting may be performed by specifying the first external line connection request corresponding to the request.

In addition, when the UAS function unit 123 receives the second external line connection request from the cloud PBX server 130 via the WAN port 128, the UAC function unit 122 of the connection adapter unit 121 receives an external line telephone call based on the second external line connection request. A third external line connection request that is a connection request to be transmitted to the server 140 is generated. Note that the destination telephone number of the third external line connection request is that of the external line connection terminal 150. The B2B-UA function unit 124 of the connection adapter unit 121 stores the correspondence between the second external line connection request and the third external line connection request (S17). For example, the B2B-UA function unit 124 stores the identifier of the second external line connection request and the identifier of the third external line connection request in association with each other.
Then, the UAC function unit 122 transmits a third external line connection request to the external line telephone server 140 (S18).

The external line telephone server 140 transmits the third external line connection request to the external line connection terminal 150 corresponding to the destination telephone number of the third external line connection request (S19).
Then, when the user responds, the external line connection terminal 150 transmits a signal indicating connection permission to the external line telephone server 140 as a third external line connection response in response to the third external line connection request (S20). The third external line connection response includes the same identifier as the third connection request.

When receiving the third external line connection response from the external line connection terminal 150, the external line telephone server 140 responds to the connection adapter unit 121 (S21).
When the UAC function unit 122 receives the third external line connection response from the external line telephone server 140, the B2B-UA function unit 124 of the connection adapter unit 121 determines the connection with the corresponding cloud PBX server 130. Moreover, the UAS function part 123 of the connection adapter part 121 produces | generates the 2nd external line connection response which is a response from the external line connection terminal 150 with respect to a 2nd external line connection request | requirement based on a 3rd external line connection response. Then, the UAS function unit 123 transmits a second external line connection response from the WAN port 128 to the corresponding cloud PBX server 130 (S22). The second external line connection response includes the same identifier as the second external line connection request.

When the cloud PBX server 130 receives the second external line connection response from the connection adapter unit 121, the cloud PBX server 130 determines the connection with the corresponding terminal device 110. Further, the cloud PBX server 130 generates a first external line connection response that is a response from the external line connection terminal 150 to the first external line connection request based on the second external line connection response. Then, the cloud PBX server 130 transmits a first external line connection response to the terminal device 110 (S23). The first external line connection response includes the same identifier as the first external line connection request.
When the WAN port 128 receives the first external line connection response, the router function unit 129 of the base GW apparatus 120 transfers the first external line connection response from the LAN port 127 to the terminal device 110.
When the terminal device 110 receives the first external line connection response from the cloud PBX server 130, the terminal device 110 establishes a call for the external line call and starts transmission / reception of the voice data for the call.

The external line telephone server 140 and the external line connection terminal 150 are also referred to as external line devices.
Also, the first external line connection request is a first call connection request, the second external line connection request is a second call connection request, the third external line connection request is a third call connection request, the first external line connection response is a first call connection response, The second external line connection response is also referred to as a second call connection response, and the third external line connection response is also referred to as a third call connection response.

  In the first embodiment, as described above, the external line connection request from the terminal device 110 and the external line connection request from the cloud PBX server 130 addressed to the same external line number detected by the base GW apparatus 120 within a certain time period. Correspondingly, conversion is performed to optimize the voice data transfer path. When there are a plurality of external line connection requests addressed to the same external line number, the processing load for determination is minimized by using the conventional transfer path without associating.

FIG. 10 is a sequence diagram illustrating a process related to call connection when performing external line connection from the external line connection terminal 150 to the terminal device 110 in the first embodiment.
First, the external line connection terminal 150 transmits a fourth external line connection request, which is a connection request addressed to the terminal device 110, to the external line telephone server 140 (S30). For example, it is assumed that the fourth external line connection request includes the telephone number of the terminal device 110 as the destination.
The external line telephone server 140 transfers the fourth external line connection request from the external line connection terminal 150 to the connection adapter unit 121 (S31).

  When the UAC function unit 122 receives the fourth external line connection request from the external telephone server 140 via the WAN port 128, the UAS function unit 123 of the connection adapter unit 121 receives the cloud PBX based on the fourth external line connection request. A fifth external line connection request that is a connection request to be transmitted to the server 130 is generated. Further, the B2B-UA function unit 124 of the connection adapter unit 121 stores the correspondence between the fourth external line connection request and the fifth external line connection request (S32). For example, the B2B-UA function unit 124 stores the identifier of the fourth external line connection request and the identifier of the fifth external line connection request in association with each other.

The UAS function unit 123 transmits a fifth external line connection request from the WAN port 128 to the cloud PBX server 130 (S33).
Further, the UAS function unit 123 notifies the call connection correspondence determination unit 126 of the content and the transmission time of the transmitted fifth external line connection request (S34).

  The call connection correspondence determining unit 126 examines the content of the fifth external line connection request received from the UAS function unit 123, and determines that it is an external line connection request from the transmission source telephone number, and starts an external line timer for a predetermined time T. (S35).

When the cloud PBX server 130 receives the fifth external line connection request from the connection adapter unit 121, the cloud PBX server 130 generates a sixth external line connection request that is a connection request destined for the terminal device 110 based on the fifth external line connection request. The correspondence between the fifth external line connection request and the sixth external line connection request is stored (S36). For example, the cloud PBX server 130 stores the identifier of the fifth external line connection request and the identifier of the sixth external line connection request in association with each other.
Then, the cloud PBX server 130 transmits a sixth external line connection request to the terminal device 110 (S37). When the WAN port 128 receives the sixth external line connection request, the router function unit 129 of the base GW apparatus 120 transfers the sixth external line connection request from the LAN port 127 to the terminal device 110.

  Here, the call control extraction unit 125 of the base GW apparatus 120 copies the content of the sixth external line connection request when the router function unit 129 transfers the sixth external line connection request from the cloud PBX server 130 to the terminal apparatus 110. Then, the contents and the reception time are notified to the call connection correspondence determination unit 126 (S38).

  The call connection correspondence determination unit 126 compares the destination telephone numbers of all the fifth external line connection requests during the activation of the external line timer with the destination telephone numbers of the sixth external line connection request received from the call control extraction unit 125, and determines the destination telephone number. It is determined whether there is a fifth external line connection request with a matching number.

Here, when the source telephone number of the fifth external line connection request is an external line number and there are a plurality of sixth external line connection requests with matching destination telephone numbers, the call connection correspondence determining unit 126 performs special processing thereafter. The voice data is transferred through a normal route without doing so.
On the other hand, if the source telephone number of the fifth external line connection request is an external line number and there is only one sixth external line connection request with the same destination telephone number, the call connection correspondence determination unit 126 determines these. The corresponding call connection is determined, and the fifth external line connection request and the sixth call connection request are associated with each other. Then, the call connection correspondence determination unit 126 sets the IP packet conversion setting in the router function unit 129 so that the base GW apparatus 120 can optimize the route shown in FIG. 6 (S39). For example, the call connection correspondence determination unit 126, as a transfer destination of the IP packet of voice data, communicates with the communication address of the external line connection terminal 150 that has transmitted the fourth external line connection request and the communication with the terminal device 110 that is the destination of the sixth external line connection request. Set the address. Here, the communication address of the external line connection terminal 150 that has transmitted the fourth external line connection request may be acquired from the UAC function unit 122 of the connection adapter unit 121.

When the user responds, the terminal device 110 that has received the sixth external line connection request transmits a signal indicating connection permission for the sixth external line connection request to the cloud PBX server 130 as a sixth external line connection response (S40).
When the LAN port 127 receives the sixth external line connection response, the router function unit 129 of the base GW apparatus 120 transfers the sixth external line connection response from the WAN port 128 to the cloud PBX server 130.
Upon receiving the sixth external line connection response from the terminal device 110, the cloud PBX server 130 generates a fifth external line connection response that is a response of the terminal device 110 to the fifth external line connection request based on the sixth external line connection response. This is transmitted to the connection adapter unit 121 (S41).

  When the UAS function unit 123 receives the fifth external line connection response from the cloud PBX server 130 via the WAN port 128, the B2B-UA function unit 124 of the connection adapter unit 121 receives the fourth external line connection request and the fifth external line connection. Based on the association of the request, the connection with the corresponding external telephone server 140 is determined. Moreover, the UAC function part 122 of the connection adapter part 121 produces | generates the 4th external line connection response which is a response from the terminal device 110 with respect to a 4th external line connection request | requirement based on a 5th external line connection response. The UAC function unit 122 transmits a fourth external line connection response from the WAN port 128 to the corresponding external line telephone server 140 (S42).

When receiving the fourth external line connection response from the connection adapter unit 121, the external line telephone server 140 responds to the external line connection terminal 150 (S43).
When the external line connection terminal 150 receives the fourth external line connection response from the external line telephone server 140, the external line call is established and transmission / reception of the voice data for the call is started.

  Here, the fourth external line connection request is the first call connection request, the fifth external line connection request is the second call connection request, the sixth external line connection request is the third call connection request, and the fourth external line connection response is the first call connection response. The fifth external line connection response is also referred to as a second call connection response, and the sixth external line connection response is also referred to as a third call connection response.

FIGS. 11 to 14 are sequence diagrams illustrating processing for transferring an external line connection from the terminal apparatus 110A that is connected to the external line to the terminal apparatus 110B.
First, in FIG. 11, it is assumed that a call is established between the terminal apparatus 110A and the external line connection terminal 150, and a first session is performed (S50).
Then, the terminal device 110A transmits an extension connection request, which is a connection request addressed to the terminal device 110B, to the cloud PBX server 130 (S51). When the LAN port 127 receives the extension connection request, the router function unit 129 of the base GW apparatus 120 transfers the extension connection request from the WAN port 128 to the cloud PBX server 130.

Upon receiving such an extension connection request, the cloud PBX server 130 transmits the extension connection request to the terminal device 110B (S52). When the WAN port 128 receives the extension connection request, the router function unit 129 of the base GW apparatus 120 transfers the extension connection request from the LAN port 127 to the terminal apparatus B.
When the user responds, the terminal device 110B that has received the extension connection request transmits a signal indicating connection permission to the cloud PBX server 130 as an extension connection response (S53). When the LAN port 127 receives the extension connection response, the router function unit 129 of the base GW apparatus 120 transfers the extension connection response from the WAN port 128 to the cloud PBX server 130.
The cloud PBX server 130 transmits the received extension connection response to the terminal device 110A (S54). When the WAN port 128 receives the extension connection response, the router function unit 129 of the base GW apparatus 120 transfers the extension connection response from the LAN port 127 to the terminal apparatus 110A.
Thereby, a call is established between the terminal device 110A and the terminal device 110B, and a second session is performed (S55).

Then, the terminal device 110A transmits a first transfer connection instruction, which is a transfer instruction addressed to the external line connection terminal 150, to the cloud PBX server 130 (S56). When the LAN port 127 receives the first transfer connection instruction, the router function unit 129 of the base GW apparatus 120 transfers the first transfer connection instruction from the WAN port 128 to the cloud PBX server 130.
When the cloud PBX server 130 receives the first transfer connection instruction from the terminal device 110, the cloud PBX server 130 generates a second transfer connection instruction that is a transfer instruction for the connection adapter unit 121, and sends the second transfer connection instruction to the connection adapter unit 121. Transmit (S57).

  When the UAS function unit 123 receives the second transfer connection instruction from the cloud PBX server 130 via the WAN port 128, the UAC function unit 122 of the connection adapter unit 121 receives a third transfer that is a transfer instruction to the external line telephone server 140. A connection instruction is generated, and the third transfer connection instruction is transmitted from the WAN port 128 to the external telephone server 140 (S58).

The external line telephone server 140 transmits a third transfer connection instruction to the external line connection terminal 150 (S59).
Then, the external line connecting terminal 150 transmits a signal indicating transfer permission to the external line telephone server 140 as a third transfer connection response (S60).

When the external line telephone server 140 receives the third transfer connection response from the external line connection terminal 150, it responds to the connection adapter unit 121 (S61).
When the UAC function unit 122 receives the third transfer connection response from the external line telephone server 140 via the WAN port 128, the UAS function unit 123 of the connection adapter unit 121 receives the second transfer connection based on the third transfer connection response. A second transfer connection response that is a response from the external line connection terminal 150 to the request is generated. Then, the UAS function unit 123 transmits a second transfer connection response from the WAN port 128 to the corresponding cloud PBX server 130 (S62).

  When the cloud PBX server 130 receives the second transfer connection response from the connection adapter unit 121, the cloud PBX server 130 generates a first transfer connection response that is a response from the external line connection terminal 150 to the first transfer connection response based on the second transfer connection response. To do. Then, the cloud PBX server 130 transmits a first transfer connection response to the terminal device 110A (S63). When the WAN port 128 receives the first transfer connection response, the router function unit 129 of the base GW apparatus 120 transfers the first transfer connection response from the LAN port 127 to the terminal apparatus 110A. Then, the process proceeds to FIG.

Next, a description will be given with reference to FIG. The external line connection terminal 150 transmits a first connection request, which is a connection request addressed to the terminal device 110B, to the external line telephone server 140 in order to switch the session (S64).
The external line telephone server 140 transfers the first connection request from the external line connection terminal 150 to the connection adapter unit 121 (S65).

  When the UAC function unit 122 receives the first connection request from the external telephone server 140 via the WAN port 128, the UAS function unit 123 of the connection adapter unit 121 sends the cloud PBX server 130 based on the first connection request. A second connection request that is a connection request to be transmitted is generated. Further, the B2B-UA function unit 124 of the connection adapter unit 121 stores the correspondence between the first connection request and the second connection request (S66). For example, the B2B-UA function unit 124 stores the identifier of the first connection request and the identifier of the second connection request in association with each other.

The UAS function unit 123 transmits a second connection request from the WAN port 128 to the cloud PBX server 130 (S67).
In addition, the UAS function unit 123 notifies the call connection correspondence determination unit 126 of the content and transmission time of the transmitted second connection request (S68).

  When the call connection correspondence determination unit 126 examines the content of the second connection request received from the UAS function unit 123 and determines that the request is an external line connection request from the transmission source telephone number, the call connection correspondence determination unit 126 starts an external line timer for a predetermined time T ( S69).

When the cloud PBX server 130 receives the second connection request from the connection adapter unit 121, the cloud PBX server 130 generates a third connection request that is a connection request destined for the terminal device 110 </ b> B, and the second connection request, the third connection request, Is stored (S70). For example, the cloud PBX server 130 stores the identifier of the second connection request and the identifier of the third connection request in association with each other. In addition, it is assumed that the third connection request includes the telephone number of the terminal device 110B.
Then, the cloud PBX server 130 transmits a third connection request to the terminal device 110B (S71). When the WAN port 128 receives the third connection request, the router function unit 129 of the base GW apparatus 120 transfers the third connection request from the LAN port 127 to the terminal apparatus 110B.

  Here, the call control extraction unit 125 of the base GW device 120 copies the content of the third connection request when the router function unit 129 transfers the third connection request from the cloud PBX server 130 to the terminal device 110B. The contents and the reception time are notified to the call connection correspondence determining unit 126 (S72).

  The call connection correspondence determination unit 126 compares the destination telephone numbers of all the second connection requests during the activation of the external line timer with the destination telephone numbers of the third connection requests received from the call control extraction unit 125, and the destination telephone number is It is determined whether there is a matching third connection request.

Here, if the source telephone number of the third connection request is an external line number and there are a plurality of matching second connection requests, the call connection correspondence determination unit 126 does not perform any special processing and performs normal processing. Audio data is transferred along the route.
On the other hand, if the source telephone number of the third connection request is an external line number and there is only one matching second connection request, the call connection correspondence determination unit 126 determines these as corresponding call connections. The second connection request and the third connection request are associated with each other. Then, the call connection correspondence determination unit 126 sets the IP packet conversion setting in the router function unit 129 so that the base GW apparatus 120 can optimize the route illustrated in FIG. 6 (S73). For example, the call connection correspondence determination unit 126 uses the communication address of the external connection terminal 150 that is the transmission source of the associated second connection request as the transfer destination of the IP packet of the voice data, and the associated third connection request. And the communication address of the destination terminal device 110B. Here, the communication address of the external line connection terminal 150 that is the transmission source of the second connection request may be acquired from the UAC function unit 122 of the connection adapter unit 121.

When the user responds, the terminal device 110B that has received the third connection request transmits a signal indicating connection permission to the cloud PBX server 130 as a third connection response (S74). When the LAN port 127 receives the third connection response, the router function unit 129 of the base GW apparatus 120 transfers the third connection response from the WAN port 128 to the cloud PBX server 130.
Upon receiving the third connection response from the terminal device 110B, the cloud PBX server 130 generates a second connection response that is a response from the terminal device 110B to the second connection request based on the third connection response, and connects this It responds to the adapter part 121 (S75).

  When the UAS function unit 123 receives the second connection response from the cloud PBX server 130 via the WAN port 128, the B2B-UA function unit 124 of the connection adapter unit 121 determines the connection with the corresponding external telephone server 140. To do. Then, the UAC function unit 122 of the connection adapter unit 121 generates a first connection response that is a response from the terminal device 110B to the first connection request based on the second connection response, and outputs the first connection response from the WAN port 128 to the corresponding external line. It transmits to the telephone server 140 (S76).

  When receiving the first connection response from the connection adapter unit 121, the external line telephone server 140 responds to the external line connection terminal 150 (S77). Then, the process proceeds to FIG.

Next, a description will be given with reference to FIG. The external line connecting terminal 150 transmits a first switching notification, which is a switching notification addressed to the terminal device 110A, to the external telephone server 140 in order to notify that the session has been switched (S78).
The external line telephone server 140 transfers the first switching notification from the external line connection terminal 150 to the connection adapter unit 121 (S79).

  When the UAC function unit 122 receives the first switching notification from the external telephone server 140 via the WAN port 128, the UAS function unit 123 of the connection adapter unit 121 sends the cloud PBX server 130 based on the first switching notification. A second switching notification, which is a switching notification to be transmitted, is generated and transmitted from the WAN port 128 to the cloud PBX server 130 (S80).

  When the cloud PBX server 130 receives the second switching notification from the connection adapter unit 121, the cloud PBX server 130 generates a third switching notification that is a switching notification for the terminal device 110A based on the second switching notification, and transmits the third switching notification to the terminal device 110A. (S81). When the WAN port 128 receives the third switching notification, the router function unit 129 of the base GW apparatus 120 transfers it from the LAN port 127 to the terminal apparatus 110A.

The terminal device 110A that has received the third switching notification transmits a signal indicating that the notification has been received to the cloud PBX server 130 as a third switching response (S82). When the LAN port 127 receives the third switching response, the router function unit 129 of the base GW apparatus 120 transfers it from the WAN port 128 to the cloud PBX server 130.
Upon receiving the third switching response from the terminal device 110A, the cloud PBX server 130 generates a second switching response that is a response from the terminal device 110A to the second switching notification based on the third switching response, and connects this The data is transmitted to the adapter unit 121 (S83).

  When the UAS function unit 123 receives the second switching response from the cloud PBX server 130 via the WAN port 128, the UAC function unit 122 of the connection adapter unit 121 responds to the first switching notification based on the second switching response. A first switching response that is a response from the terminal device 110A is generated. Then, the UAC function unit 122 transmits a first switching response from the WAN port 128 to the corresponding external telephone server 140 (S84).

When the external line telephone server 140 receives the first switching response from the connection adapter unit 121, it responds to the external line connection terminal 150 (S85).
Thereby, the call between the external line connection terminal 150 and the terminal device 110B is established, and the third session is performed (S86). Then, the process proceeds to FIG.

  Next, a description will be given with reference to FIG. The terminal device 110B transmits an extension disconnection request, which is a request for disconnecting the session with the terminal device 110A, to the cloud PBX server 130 (S87). When the LAN port 127 receives the extension disconnection request, the router function unit 129 of the base GW apparatus 120 transfers the extension disconnection request from the WAN port 128 to the cloud PBX server 130.

The cloud PBX server 130 that has received such an extension disconnection request transmits the extension disconnection request to the terminal device 110A (S88). When the WAN port 128 receives the extension disconnection request, the router function unit 129 of the base GW apparatus 120 transfers the extension disconnection request from the LAN port 127 to the terminal apparatus 110A.
The terminal device 110A that has received the extension disconnection request transmits a signal indicating disconnection permission to the cloud PBX server 130 as an extension disconnection response (S89). When the LAN port 127 receives the extension disconnection response, the router function unit 129 of the base GW apparatus 120 transfers the extension disconnection response from the WAN port 128 to the cloud PBX server 130.
The cloud PBX server 130 transmits the received extension disconnection response to the terminal device 110B (S90). When the WAN port 128 receives the extension disconnection response, the router function unit 129 of the base GW apparatus 120 transfers the extension disconnection response from the LAN port 127 to the terminal apparatus 110B.
Accordingly, the second session between the terminal device 110A and the terminal device 110B is disconnected (S91).

Then, the terminal device 110A transmits a first external line disconnection request, which is a request for disconnecting the session with the external line connection terminal 150, to the cloud PBX server 130 (S92). When the LAN port 127 receives the first external line disconnection request, the router function unit 129 of the base GW apparatus 120 transfers it to the cloud PBX server 130 from the WAN port 128.
When the cloud PBX server 130 receives the first external line disconnect request from the terminal device 110A, the cloud PBX server 130 generates a second external line disconnect request that is a disconnect request to be transmitted to the connection adapter unit 121 based on the first external line disconnect request. A 2 external line disconnection request is transmitted to the connection adapter unit 121 (S93).

  When the UAS function unit 123 receives the second external line disconnection request from the cloud PBX server 130 via the WAN port 128, the UAC function unit 122 of the connection adapter unit 121 receives the external line telephone server based on the second external line disconnection request. A third external line disconnection request that is a disconnection request to be transmitted to 140 is generated, and the third external line disconnection request is transmitted to the external line telephone server 140 (S94).

The external line telephone server 140 transmits a third external line disconnection request to the external line connection terminal 150 (S95).
Then, the external line connection terminal 150 transmits a signal indicating disconnection permission to the external line telephone server 140 as a third external line disconnection response (S96).

When receiving the third external line disconnection response from the external line connection terminal 150, the external line telephone server 140 responds to the connection adapter unit 121 (S97).
When the UAC function unit 122 receives the third external line disconnection response from the external line telephone server 140 via the WAN port 128, the UAS function unit 123 of the connection adapter unit 121 disconnects the second external line based on the third external line disconnection response. A second external line disconnection response that is a response from the external line connection terminal 150 to the request is generated. Then, the UAS function unit 123 transmits a second external line disconnection response from the WAN port 128 to the corresponding cloud PBX server 130 (S98).

Upon receiving the second external line disconnection response from the connection adapter unit 121, the cloud PBX server 130 generates a first external line disconnection response that is a response from the external line connection terminal 150 to the first external line disconnection request from the second external line disconnection response, It is transmitted to the terminal device 110A (S99). When the WAN port 128 receives the first external line disconnection response, the router function unit 129 of the base GW apparatus 120 transfers it from the LAN port 127 to the terminal apparatus 110A.
Thus, the first session between the terminal device 110A and the external line connection terminal 150 is disconnected (S100).

  As described above, in the first embodiment, the voice data does not pass through the cloud PBX server 130 by performing conversion on the voice data transmitted and received between the terminal device 110 and the external line connection terminal 150. At this time, depending on the configuration of the cloud PBX server 130, it may be determined that the call has ended or the call has not been normally performed, and the call disconnecting operation may be started. Embodiment 1 cannot be applied to a system in which audio data itself is used for this determination.

On the other hand, for example, in a system in which voice data is transmitted / received by RTP (Real-Time Transport Protocol) and the statistical information is transmitted / received by RTCP (Real-Time Transport Control Protocol), the cloud PBX server 130 is based on RTCP information. When determining the end of a call and the normality of the call, by limiting the target to be converted by the base GW device 120 to only RTP, RTCP is transmitted and received between the cloud PBX server 130 and the terminal device 110 as before, Connection can be maintained.
Examples of the protocol used for call control shown in the first embodiment include SIP (Session Initiation Protocol) and H.264. However, the protocol used in Embodiment 1 is not limited to these.

Embodiment 2. FIG.
In the first embodiment, focusing on the connection request for each call connection, the connection request from the terminal device 110 or the connection adapter unit 121 addressed to the same number whose detection timing is within a certain time, and the connection from the cloud PBX server 130 Although the requests are associated with each other, there are cases where the association cannot be made, for example, when a connection request is transmitted from the plurality of terminal devices 110 or the connection adapter unit 121 to the same number at almost the same time.
In the second embodiment, a mechanism for improving the probability of association is added. In addition to the connection request focused on in the first embodiment, a connection response is also detected within a certain period of time. Correspondence between call connections is performed.

As shown in FIG. 1, the communication system 200 according to the second embodiment includes terminal devices 110A and 110B, a base GW device 220 as a gateway device, a cloud PBX server 130 as an exchange server, and an external telephone. Server 140.
The communication system 200 according to the second embodiment is configured in the same manner as the communication system 100 according to the first embodiment except for the base GW device 220. Further, the external telephone server 140 may be connected to the Internet 103 as in the communication system 200 # shown in FIG.

As shown in FIG. 7, the base GW apparatus 220 includes a connection adapter unit 221, a call control extraction unit 225, a call connection correspondence determination unit 226, a LAN port 127, a WAN port 128, and a router function unit. 129.
The base GW apparatus 220 in the second embodiment is configured in the same manner as the base GW apparatus 120 in the first embodiment except for the connection adapter unit 221, the call control extraction unit 225, and the call connection correspondence determination unit 226.

The connection adapter unit 221 includes a UAC function unit 122, a UAS function unit 223, and a B2B-UA function unit 124.
The connection adapter unit 221 in the second embodiment is configured in the same manner as the connection adapter unit 121 in the first embodiment except for the UAS function unit 223.

  The UAS function unit 223 according to the second embodiment performs the same processing as the UAS function unit 123 according to the first embodiment, and also transmits an external line connection response to the cloud PBX server 130. Is notified to the call connection correspondence determination unit 226.

  The call control extraction unit 225 according to the second embodiment performs processing similar to that of the first embodiment, obtains a copy of the external line connection response to the external line connection request from the cloud PBX server 130 to the terminal device 110, and performs call connection. This is given to the correspondence determination unit 226.

The call connection correspondence determination unit 226 determines the association between the first external line connection request from the terminal device 110 to the cloud PBX server 130 and the second external line connection request from the cloud PBX server 130 to the base GW apparatus 220. The call connection correspondence determination unit 226 sets a provisional correspondence when the correspondence here is taken.
Then, the call connection correspondence determination unit 226 determines the association between the second external line connection response from the base GW device 220 to the cloud PBX server 130 and the first external line connection response from the cloud PBX server 130 to the terminal device 110. Thus, the correspondence used for packet conversion is determined from the provisional correspondence.
As described above, the call connection correspondence determination unit 226 performs a plurality of associations in the first external line connection request from the terminal device 110 to the cloud PBX server 130 and the second external line connection request from the cloud PBX server 130 to the base GW apparatus 220. Even when a message is detected, the correspondence used for packet conversion can be determined.

Further, the call connection correspondence determination unit 226 determines the association between the fifth external line connection request from the connection adapter unit 221 to the cloud PBX server 130 and the sixth external line connection request from the cloud PBX server 130 to the terminal device 110. . The call connection correspondence determination unit 226 sets a provisional correspondence when the correspondence here is taken.
Then, the call connection correspondence determination unit 226 determines the correspondence between the sixth external line connection response from the terminal device 110 to the cloud PBX server 130 and the fifth external line connection response from the cloud PBX server 130 to the connection adapter unit 221. As a result, the correspondence used for packet conversion is determined from the provisional correspondence.
As described above, the call connection correspondence determination unit 226 performs a plurality of associations in the fifth external line connection request from the connection adapter unit 221 to the cloud PBX server 130 and the sixth external line connection request from the cloud PBX server 130 to the terminal device 110. Even when a message is detected, the correspondence used for packet conversion can be determined.

FIG. 15 is a sequence diagram illustrating a process related to call connection when performing external line connection from the terminal device 110 in the second embodiment.
First, the terminal device 110 transmits a first external line connection request, which is a connection request addressed to an external line number, to the cloud PBX server 130 (S110). The external line number here is assumed to be the telephone number of the external line connection terminal 150. The router function unit 129 of the base GW apparatus 220 transfers the first external line connection request received at the LAN port 127 from the WAN port 128 to the cloud PBX server 130.

  When the router function unit 129 transfers the first external line connection request from the terminal device 110 to the cloud PBX server 130, the call control extraction unit 225 of the base GW apparatus 220 copies the content of the first external line connection request, The contents and the reception time are notified to the call connection correspondence determination unit 226 (S111).

  The call connection correspondence determination unit 226 examines the contents of the first external line connection request received from the call control extraction unit 225, and determines that the request is an external line connection request from the destination telephone number, and starts an external line timer for a predetermined time T. (S112).

When the cloud PBX server 130 receives the first external line connection request from the terminal device 110, the cloud PBX server 130 generates a second external line connection request that is a connection request to be transmitted to the connection adapter unit 221 based on the first external line connection request. The correspondence between the 1 external line connection request and the second external line connection request is stored (S113). For example, the cloud PBX server 130 stores the identifier of the first external line connection request and the identifier of the second external line connection request in association with each other.
Then, the cloud PBX server 130 transmits a second external line connection request to the connection adapter unit 221 (S114).

When the UAS function unit 223 of the connection adapter unit 221 receives the second external line connection request from the cloud PBX server 130 via the WAN port 128, the content of the received second external line connection request and the reception time are determined for call connection correspondence. The unit 226 is notified (S115).
The call connection correspondence determination unit 226 compares the destination telephone numbers of all the first external line connection requests during the activation of the external line timer with the destination telephone numbers of the second external line connection requests received from the connection adapter unit 221 to determine the destination telephone number It is determined whether there is a first external line connection request that matches.

  Here, when the destination telephone number of the second external line connection request is an external line number and there is a matching first external line connection request, the call connection correspondence determination unit 226 provisionally determines these as corresponding call connections. (S116). Then, the call connection correspondence determination unit 226 temporarily associates the first external line connection request and the second external line connection request.

In addition, when the UAS function unit 223 receives the second external line connection request from the cloud PBX server 130 via the WAN port 128, the UAC function unit 122 of the connection adapter unit 221 performs an external line based on the second external line connection request. A third external line connection request that is a connection request with the connection terminal 150 as a destination is generated. Further, the B2B-UA function unit 124 of the connection adapter unit 221 stores the correspondence between the second external line connection request and the third external line connection request (S117). For example, the B2B-UA function unit 124 stores the identifier of the second external line connection request and the identifier of the third external line connection request in association with each other.
Then, the UAC function unit 122 transmits a third external line connection request from the WAN port 128 to the external line telephone server 140 (S118).

The external line telephone server 140 transmits the third external line connection request to the external line connection terminal 150 corresponding to the destination telephone number of the third external line connection request (S119).
Then, when the user responds, the external line connection terminal 150 transmits a signal indicating connection permission to the external line telephone server 140 as a third external line connection response in response to the third external line connection request (S120). The third external line connection response includes the same identifier as the third connection request.

When receiving the third external line connection response from the external line connection terminal 150, the external line telephone server 140 responds to the connection adapter unit 221 (S121).
When the UAC function unit 122 receives the third external line connection response from the external telephone server 140 via the WAN port 128, the B2B-UA function unit 124 of the connection adapter unit 221 receives the second external line connection request and the third external line connection. Based on the association of the requests, the connection with the corresponding cloud PBX server 130 is determined. Moreover, the UAS function part 223 of the connection adapter part 221 produces | generates the 2nd external line connection response which is a response from the external line connection terminal 150 with respect to a 2nd external line connection request | requirement based on a 3rd external line connection response. Then, the UAS function unit 223 transmits a second external line connection response from the WAN port 128 to the corresponding cloud PBX server 130 (S122). The second external line connection response includes the same identifier as the second external line connection request.

Here, the UAS function unit 223 notifies the call connection correspondence determination unit 226 of the content of the transmitted second external line connection response and the transmission time (S123).
When the call connection correspondence determination unit 226 examines the content of the second external line connection response received from the UAS function unit 223 and determines that it is an external line connection response from the transmission source telephone number, the call connection correspondence determination unit 226 starts an external line timer for a predetermined time T. (S124).

When the cloud PBX server 130 receives the second external line connection response from the connection adapter unit 221, the cloud PBX server 130 determines the connection with the corresponding terminal device 110, and then, based on the second external line connection response, the external line for the first external line connection request A first external line connection response that is a response from the connection terminal 150 is generated. Then, the cloud PBX server 130 transmits a first external line connection response to the corresponding terminal device 110 (S125). The first external line connection response includes the same identifier as the first external line connection request.
When the WAN port 128 receives the first external line connection response, the router function unit 129 of the base GW apparatus 220 transfers the first external line connection response from the LAN port 127 to the terminal device 110.

  When the router function unit 129 transfers the first external line connection response from the cloud PBX server 130 to the terminal device 110, the call control extraction unit 225 of the base GW apparatus 220 copies the content of the first external line connection response, The contents and the reception time are notified to the call connection correspondence determination unit 226 (S126).

  When the call connection correspondence determination unit 226 receives the reception time and content of the first external line connection response received from the cloud PBX server 130, the call connection correspondence determination unit 226 sets the same destination telephone number for all the second external line connection responses that are running the external line timer. Determine if there is something. When a call with the same destination telephone number is found, the call connection correspondence determining unit 226 associates the second external line connection response with the first external line connection response. Next, the call connection correspondence determination unit 226 associates the pair of the terminal device 110 and the external line connection terminal 150 that constitutes the transmission source and destination of the first external line connection request and the second external line connection request that are temporarily associated with each other. The pair of the terminal device 110 and the external line connection terminal 150 constituting the transmission source and destination of the received first external line connection response and the second external line connection response is confirmed. If there is the same pair, the call connection correspondence determination unit 226 determines the association between the first external line connection request and the second external line connection request of the pair. When the same pair is not found, the call connection correspondence determination unit 226 gives up the association and continues normal transfer.

  Then, the call connection correspondence determination unit 226 sets the IP packet conversion setting in the router function unit 129 so that the base GW apparatus 220 can optimize the route shown in FIG. 6 (S127). For example, the call connection correspondence determination unit 226 uses the communication address of the terminal device 110 that has transmitted the first external line connection request determined to be the corresponding call connection as the transfer destination of the IP packet of the voice data, and the corresponding call connection. The communication address of the external line connection terminal 150 that is the destination of the second external line connection request that has been determined to be is set.

  When the terminal device 110 receives the first external line connection response from the cloud PBX server 130, the terminal device 110 establishes a call for the external line call and starts transmission / reception of the voice data for the call.

FIG. 16 is a sequence diagram illustrating a process related to call connection when performing external line connection from the external line connection terminal 150 to the terminal device 110 in the second embodiment.
First, the external line connection terminal 150 transmits a fourth external line connection request, which is a connection request addressed to the terminal device 110, to the external line telephone server 140 (S130). For example, it is assumed that the fourth external line connection request includes the telephone number of the terminal device 110 as the destination.
The external line telephone server 140 transfers the fourth external line connection request from the external line connection terminal 150 to the connection adapter unit 221 (S131).

  When the UAC function unit 122 receives the fourth external line connection request from the external telephone server 140 via the WAN port 128, the UAS function unit 223 of the connection adapter unit 221 receives the cloud PBX based on the fourth external line connection request. A fifth external line connection request that is a connection request to be transmitted to the server 130 is generated. Further, the B2B-UA function unit 124 of the connection adapter unit 221 stores the correspondence between the fourth external line connection request and the fifth external line connection request (S132). For example, the B2B-UA function unit 124 stores the identifier of the fourth external line connection request and the identifier of the fifth external line connection request in association with each other.

The UAS function unit 223 transmits the fifth external line connection request from the WAN port 128 to the cloud PBX server 130 (S133).
Also, the UAS function unit 223 notifies the call connection correspondence determination unit 226 of the content and transmission time of the transmitted fifth external line connection request (S134).

  When the call connection correspondence determination unit 226 examines the content of the fifth external line connection request received from the UAS function unit 223 and determines that it is an external line connection request from the transmission source telephone number, the call connection correspondence determination unit 226 starts an external line timer for a predetermined time T. (S135).

When the cloud PBX server 130 receives the fifth external line connection request from the connection adapter unit 221, the cloud PBX server 130 generates a sixth external line connection request that is a connection request destined for the terminal device 110 based on the fifth external line connection request. The correspondence between the fifth external line connection request and the sixth external line connection request is stored (S136). For example, the cloud PBX server 130 stores the identifier of the fifth external line connection request and the identifier of the sixth external line connection request in association with each other.
Then, the cloud PBX server 130 transmits a sixth external line connection request to the terminal device 110 (S137). When the WAN port 128 receives the sixth external line connection request, the router function unit 129 of the base GW apparatus 220 transfers the sixth external line connection request from the LAN port 127 to the terminal device 110.

  Here, the call control extraction unit 225 of the base GW apparatus 220 copies the content of the sixth external line connection request when the router function unit 129 transfers the sixth external line connection request from the cloud PBX server 130 to the terminal apparatus 110. Then, the contents and the reception time are notified to the call connection correspondence determination unit 226 (S138).

  The call connection correspondence determination unit 226 compares the destination telephone numbers of all the fifth external line connection requests during the activation of the external line timer with the destination telephone numbers of the sixth external line connection request received from the call control extraction unit 225, and It is determined whether there is a fifth external line connection request with a matching number.

  Here, if the transmission source telephone number of the fifth external line connection request is an external line number and there is a matching sixth external line connection request, the call connection correspondence determination unit 226 determines that these are call connections corresponding to the provisional connection. (S139). Then, the call connection correspondence determination unit 226 temporarily associates the fifth external line connection request with the sixth external line connection request.

When the user responds, the terminal apparatus 110 that has received the sixth external line connection request transmits a signal indicating connection permission to the cloud PBX server 130 as a sixth external line connection response (S140).
When the LAN port 127 receives the sixth external line connection response, the router function unit 129 of the base GW apparatus 220 transfers the sixth external line connection response from the WAN port 128 to the cloud PBX server 130.

  When the router function unit 129 transfers the fourth external line connection response from the terminal device 110 to the cloud PBX server 130, the call control extraction unit 225 of the base GW apparatus 220 copies the content of the sixth external line connection response, The contents and the reception time are notified to the call connection correspondence determination unit 226 (S141).

  The call connection correspondence determination unit 226 examines the content of the sixth external line connection response received from the call control extraction unit 225, and starts the external line timer for a predetermined time T when it is determined from the destination telephone number that it is an external line connection response. (S142).

  Upon receiving the sixth external line connection response from the terminal device 110, the cloud PBX server 130 generates a fifth external line connection response that is a response of the terminal device 110 to the fifth external line connection request based on the sixth external line connection response. This is returned to the connection adapter unit 221 (S143).

  When the UAS function unit 223 of the connection adapter unit 221 receives the fifth external line connection response from the cloud PBX server 130 via the WAN port 128, the content of the received fifth external line connection request and the reception time are set for the call connection. The determination unit 226 is notified (S144).

  The call connection correspondence determination unit 226 compares the destination telephone numbers of all the sixth external line connection responses during the activation of the external line timer with the destination telephone numbers of the fifth external line connection response received from the connection adapter unit 221 to determine the destination telephone number It is determined whether there is a sixth external line connection response that matches. If the same destination telephone number is found, the call connection correspondence determination unit 226 associates the fifth external line connection response with the sixth external line connection response. Next, the call connection correspondence determination unit 226 associates the pair of the terminal device 110 and the external line connection terminal 150 that constitute the transmission source and destination of the fifth external line connection request and the sixth external line connection request that are temporarily associated with each other. The pair of the terminal device 110 and the external line connection terminal 150 constituting the transmission source and destination of the received 5th external line connection response and 6th external line connection response is confirmed. When there is the same pair, the call connection correspondence determination unit 226 determines the association between the fifth external line connection request and the sixth external line connection request of the pair. When the same pair is not found, the call connection correspondence determination unit 226 gives up the association and continues normal transfer.

  Then, the call connection correspondence determination unit 226 sets the IP packet conversion setting in the router function unit 129 so that the base GW apparatus 220 can optimize the route illustrated in FIG. 6 (S145). For example, the call connection correspondence determination unit 226 uses the communication address of the external line connection terminal 150 that is the transmission source of the fifth external line connection request whose association has been established as the transfer destination of the IP packet of the voice data, and the first 6 Set the communication address of the destination terminal device 110 of the external line connection request.

  When the UAS function unit 223 receives the fifth external line connection response from the cloud PBX server 130 via the WAN port 128, the B2B-UA function unit 124 of the connection adapter unit 221 establishes a connection with the corresponding external line telephone server 140. judge. Then, the UAC function unit 122 of the connection adapter unit 221 generates a fourth external line connection response, which is a response of the terminal device 110 to the fourth external line connection request, based on the fifth external line connection response, and sends it from the WAN port 128. It transmits to the corresponding outside line telephone server 140 (S146).

Upon receiving the fourth external line connection response from the connection adapter unit 221, the external line telephone server 140 responds to the external line connection terminal 150 (S 147).
When the external line connection terminal 150 receives the fourth external line connection response from the external line telephone server 140, the external line call is established and transmission / reception of the voice data for the call is started.

  As described above, according to the second embodiment, unlike the first embodiment, it is possible to improve the likelihood of association by performing association between call connections at a plurality of packet reception timings.

  As described above, according to the first embodiment and the second embodiment, in the communication systems 100 and 200 operated in a form in which a line for an external line call is prepared at each base, the extension terminal device 110 in the base is used. Since the voice data packet transmitted from the terminal device 110 to the cloud PBX server 130 can be directly transferred to the external phone server 140 at the base GW devices 120 and 220 when using an external line call from the terminal 110, a transfer delay, and Voice quality deterioration due to packet loss can be improved or avoided, and the processing load of the cloud PBX server 130 can be reduced.

  100, 200 communication system, 101 LAN, 102 carrier network, 103 Internet, 110 terminal device, 120, 220 base GW device, 121, 221 connection adapter unit, 122 UAC function unit, 123, 223 UAS function unit, 124 B2B-UA Function unit, 125,225 call control extraction unit, 126,226 call connection correspondence determination unit, 127 LAN port, 128 WAN port, 129 router function unit, 130 cloud PBX server, 140 external telephone server, 150 external line connection terminal.

Claims (8)

A first network to which a plurality of terminal devices are connected, and a gateway device connected to a second network to which an exchange server and a plurality of external line devices are connected,
A first interface for communicating with the first network;
A second interface for communicating with the second network;
When the first interface receives a first call connection request that is transmitted from one terminal device included in the plurality of terminal devices and is a connection request to one external line device included in the plurality of external line devices, A router function unit for transferring the first call connection request from the second interface to the exchange server;
When the second interface receives a second call connection request generated by the exchange server based on the first call connection request, the one external line device is designated as a destination based on the second call connection request. A connection adapter that generates a third call connection request and associates the second call connection request with the third call connection request, and transmits the third call connection request from the second interface;
By associating the first call connection request and the second call connection request, the first call connection based on the second call connection request and the third call connection request associated with each other in the connection adapter unit. The one terminal device that is a transmission source of the request and the one external line device that is the destination of the third call connection request are identified, and the one terminal device and the one external line device are specified in the router function unit And a call connection correspondence determining unit that transfers voice data to and from the gateway device. The call connection correspondence determining unit is configured so that a time from when the first interface receives the first call connection request until the second interface receives the second call connection request is within a predetermined time. The gateway device according to claim 1, wherein in some cases, the first call connection request and the second call connection request are associated with each other. When the second interface receives a third call connection response that is a response from the one external line device to the third call connection request, the connection adapter unit receives the third call connection response based on the third call connection response. A second call connection response that is a response from the one external line device to the two-call connection request is generated, and the second call connection response is generated based on the correspondence between the second call connection request and the third call connection request. To the exchange server from the second interface,
In the case where the second interface receives the first call connection response that is generated based on the second call connection response and is a response from the one external line device to the first call connection request. And transferring the first call connection response from the first interface to the one terminal device,
The call connection correspondence determination unit
When the time from when the first interface receives the first call connection request until the second interface receives the second call connection request is within a predetermined first time, Temporarily correlating the first call connection request and the second call connection request,
When the time from when the second interface receives the second call connection response until the second interface receives the first call connection response is within a predetermined second time, Associating a second call connection response with the first call connection response;
A pair of the terminal device and the outside line device that constitutes a transmission source and a destination of the first call connection request and the second call connection request that are temporarily associated with each other, Correspondence between the first call connection request and the second call connection request temporarily associated with each other when the pair of the terminal device and the external line device constituting the transmission source and destination of the first call connection response is the same 2. The gateway device according to claim 1, wherein the gateway device is fixed and the router function unit is caused to transfer the voice data based on the determined association. A first network to which a plurality of terminal devices are connected, and a gateway device connected to a second network to which an exchange server and a plurality of external line devices are connected,
A first interface for communicating with the first network;
A second interface for communicating with the second network;
When the second interface receives a first call connection request that is transmitted from one external device included in the plurality of external devices and is a connection request to one terminal device included in the plurality of terminal devices, A second call connection request to be transmitted to the exchange server is generated based on the first call connection request, the first call connection request and the second call connection request are associated with each other, and the second call connection request is assigned to the first call connection request. A connection adapter section that transmits from two interfaces;
When the second interface receives a third call connection request generated by the switching server based on the second call connection request and destined for the one terminal device, the third call connection request is sent to the first call connection request. A router function unit for transferring from one interface to the one terminal device;
By associating the second call connection request and the third call connection request, the first call connection based on the first call connection request and the second call connection request associated by the connection adapter unit. The one external line device that is the transmission source of the request and the one terminal device that is the destination of the third call connection request are identified, and the one external line device and the one terminal device are specified in the router function unit And a call connection correspondence determining unit that transfers voice data to and from the gateway device. The call connection correspondence determining unit is configured so that a time from when the second interface receives the second call connection request until the second interface receives the third call connection request is within a predetermined time. 5. The gateway device according to claim 4, wherein in some cases, the second call connection request is associated with the third call connection request. The router function unit sends the third call connection response to the second interface when the first interface receives a third call connection response that is a response from the one terminal device to the third call connection request. To the exchange server,
When the second interface receives the second call connection response generated by the exchange server based on the third call connection response, the connection adapter unit receives the first call based on the second call connection response. A first call connection response, which is a response from the one terminal device to the call connection request, is generated, and the first call connection response is generated based on the correspondence between the first call connection request and the second call connection request. Transmitting from the second interface to the one external line device;
The call connection correspondence determination unit
When a time from when the second interface receives the first call connection request until the second interface receives the second call connection request is within a predetermined first time, Temporarily correlating the first call connection request and the second call connection request,
When the time from when the first interface receives the third call connection response until the second interface receives the second call connection response is within a predetermined second time, Associating a third call connection response with the second call connection response,
The pair of the terminal device and the external line device constituting the transmission source and destination of the first call connection request and the second call connection request that are temporarily associated with each other are the third call connection response and the associated When the pair of the terminal device and the external line device constituting the source and destination of the second call connection response is the same, the provisionally associated first call connection request and the second call connection request The gateway apparatus according to claim 4, wherein the association is confirmed, and the router function unit is configured to transfer the voice data based on the confirmed association. A first interface that communicates with a first network to which a plurality of terminal devices are connected, and a second interface that communicates with a second network to which an exchange server and a plurality of external line devices are connected. A transfer method performed by a gateway device,
When the first interface receives a first call connection request that is transmitted from one terminal device included in the plurality of terminal devices and is a connection request to one external line device included in the plurality of external line devices, Transferring the first call connection request from the second interface to the exchange server;
When the second interface receives a second call connection request generated by the exchange server based on the first call connection request, the one external line device is designated as a destination based on the second call connection request. Generating a third call connection request, and associating the second call connection request with the third call connection request, and transmitting the third call connection request from the second interface;
By associating the first call connection request and the second call connection request, based on the associated second call connection request and the third call connection request, a transmission source of the first call connection request The one terminal device and the one external line device that is the destination of the third call connection request, and transfer voice data between the one terminal device and the one external line device A transfer method characterized by the above. A first interface that communicates with a first network to which a plurality of terminal devices are connected, and a second interface that communicates with a second network to which an exchange server and a plurality of external line devices are connected. A transfer method performed by a gateway device,
When the second interface receives a first call connection request that is transmitted from one external device included in the plurality of external devices and is a connection request to one terminal device included in the plurality of terminal devices, A second call connection request to be transmitted to the exchange server is generated based on the first call connection request, the first call connection request and the second call connection request are associated with each other, and the second call connection request is assigned to the first call connection request. 2 Send from interface
When the second interface receives a third call connection request generated by the switching server based on the second call connection request and destined for the one terminal device, the third call connection request is sent to the first call connection request. Transfer from one interface to the one terminal device,
By associating the second call connection request and the third call connection request, based on the associated first call connection request and second call connection request, the transmission source of the first call connection request The one external line device and the one terminal apparatus that is the destination of the third call connection request are identified, and voice data is transferred between the one external line apparatus and the one terminal apparatus A transfer method characterized by the above.

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