JP2021052339A - Telephone controller and port number change method - Google Patents

Abstract

To achieve an appropriate telephone call on a lower-priority telephone controller side even when a port number used for which an upper-priority telephone uses for a telephone call is impossible to change because it is fixed.SOLUTION: If a transmission destination port section 314 determines that a transmission destination port number of received message information does not meet a port number for telephone call set at an own device, a port change processing section 315 functions and changes the transmission destination port number of the received message information to the port number for telephone call set at the own device.SELECTED DRAWING: Figure 4

Description

The present invention relates to, for example, a telephone control device such as a gateway device that enables voice communication using VoIP (Voice over Internet Protocol) and a port number changing method used in the telephone control device.

Patent Document 1 described later discloses an invention relating to an upper gateway device (telephone control device) or the like that ensures registration of a port of a lower gateway device under the control of the upper gateway device in a system in which gateway devices are connected in multiple stages. Has been done. In the invention disclosed in Patent Document 1, the upper gateway device registers or deletes a port in response to a request from the lower gateway device.

Further, the upper gateway device notifies the lower gateway device of the number of port entries when the port is deleted. Further, the upper gateway device realizes a function of notifying the lower gateway device of the confirmation result in response to the confirmation request of the port entry from the lower gateway device. As a result, in the upper gateway device, it is possible to ensure the management of the port of the lower gateway device, and it is possible to provide a sufficient VoIP service to the terminal of the VoIP network.

Japanese Unexamined Patent Publication No. 2008-295067

In recent years, for example, a gateway device (telephone control device) has been added to each department of a company so that the IP telephone function can be used. In this case, each department may be a so-called section in charge of different work such as a sales department or an accounting department, or it may be a different building on the same site. It may also be located at a distance, such as a branch office or branch office. In this case, a higher-level gateway device that bundles the added gateway devices is arranged above the added gateway device. The added gateway device (lower gateway device) can be connected to a WAN (Wide Area Network) or another LAN (Local Area Network) via the upper gateway device.

In such a computer network, TCP and UDP, which correspond to the transport layer of the Internet protocol suite, use the above-mentioned port (port number) when designating an endpoint for inter-host communication. TCP is an abbreviation for Transmission Control Protocol, and UDP is an abbreviation for User Datagram Protocol. Then, from the lower gateway device to the upper gateway device, for example, as in the invention described in Patent Document 1 described above, the port number used for communication is notified and registered (registered), thereby causing a delay. It becomes possible to communicate without.

The IANA (Internet Assigned Numbers Authority), an organization that manages Internet-related numbers in an integrated manner, manages TCP and UDP port numbers, although it is not enforceable. For example, the port number "5060" is specified as a case where communication (call) is performed between two points by using SIP (Session Initiation Protocol). However, in the lower gateway device, for example, for reasons such as software design, the port number used when making a call between two points using SIP is desired to be, for example, "6060" other than "5060". In some cases. In such a case, it is conceivable to register the port number used from the lower gateway device to the higher gateway device as in the invention disclosed in Patent Document 1 described above.

However, it is considered that the upper gateway device cannot properly accept the port number registration request from the lower gateway device, and as a result, the port number registration request is ignored. in this case. There is a port number that is always processed as "5060" managed by IANA when a call is made between two points using SIP. That is, it is considered that some of the higher-level gateway devices are fixed so that the port number of the other party always uses "5060" as a specified value.

In particular, if the manufacturer of the upper gateway device and the lower gateway device are different, the port number may not be properly registered for the upper gateway device. In this case, the port number of the lower gateway device specified by the upper gateway device is different from that used by the lower gateway device, which may cause inconvenience such as not being able to start a call. ..

In view of the above, according to the present invention, even if the port number used by the higher-level telephone control device cannot be fixed and changed, the lower-level telephone control device can appropriately make a call. The purpose is to do so.

In order to solve the above problems, the telephone control device of the invention according to claim 1 is
A telephone control device that is located below a predetermined higher-level telephone control device and is connected to another network via the higher-level telephone control device.
A destination port determination means for determining whether or not the destination port number of the received message information matches the call port number set in the own device,
When the destination port determination means determines that they do not match, the destination port number of the received message information is changed to the port number for the call set in the own machine. It is characterized by that.

According to the telephone control device of the invention according to claim 1, the destination port determination means determines that the destination port number of the received message information does not match the call port number set in the own machine. Suppose. In this case, the port changing means functions and the destination port number of the received message information is changed to the port number for the call set in the own machine. As a result, the received message information is appropriately taken over by the call application specified by the port number so that the call can be made.

According to the present invention, even if a higher-level telephone control device cannot change the port number for a call by fixing it, it is possible to appropriately make a call by processing in a lower-level telephone control device.

It is a block diagram for demonstrating the configuration example of the communication system of embodiment. It is a figure for demonstrating the example of the storage data of the address management memory of the telephone control apparatus of embodiment. It is a block diagram for demonstrating the configuration example of the WAN side IP line control part of the telephone control apparatus of embodiment. It is a block diagram for demonstrating the configuration example of the routing control part of the WAN side IP line control part of embodiment. It is a sequence diagram for demonstrating the process when the incoming call occurs in the IP extension telephone under the control device of the telephone control device of embodiment. It is a sequence diagram following FIG. It is a sequence diagram for demonstrating the process at the time of making a call from the IP extension telephone under the control device of the telephone control device of embodiment. It is a sequence diagram following FIG.

Hereinafter, an embodiment of the apparatus and method of the present invention will be described with reference to the drawings. In the embodiment described below, for example, in a company, a telephone control device (gateway device) is added for each predetermined unit, such as for each department, each building, and each branch, and the IP telephone function is used. The case where a possible communication system is constructed will be described as an example.

[Communication system configuration example]
FIG. 1 is a block diagram for explaining a configuration example of the communication system of the embodiment. As shown in FIG. 1, the communication system of this embodiment includes a telephone control device (lower) 1, a PC (Personal Computer) 4, a NW (Network) device 5, and a telephone control device (upper) 10. The router 20 is connected and configured through the LAN 200. The router 20 is connected to the wide area network 100 via an ONU (Optical Network Unit) 30. Wide area network 100 means WAN and includes the Internet.

The router 20 is a communication device that relays data between two or more different networks in a computer network, and has a route selection function that determines which route the data should be transferred through in the network layer (third layer). .. Therefore, the router 20 enables the connection between the LAN 200 and the wide area network 100. The router 20 also enables connection with different LANs connected to the LAN 200.

The ONU 30 is connected to the end of the wide area network 100, and realizes a function of connecting a device on the user side to the wide area network 100. In this embodiment, the wide area network 100 is an optical communication network, and the ONU 30 has a function of converting between an optical signal and an electric signal and multiplexing / separating the optical signal. The PC 4 and the NW device 5 can be connected to the wide area network 100 and communicate with each other through the router 20 and the ONU 30, and can also communicate with other devices such as a PC connected to the LAN 200. The NW device 5 includes various devices for forming a computer network such as a router and a firewall.

The telephone control device (lower) 1 is to which one embodiment of the apparatus and method of the present invention is applied, and will be simply referred to as the telephone control device 1 below. The telephone control device 1 is so-called behind-connected to the telephone control device (upper) (hereinafter referred to as the upper telephone control device) 10 located at the upper level, and is connected to the lower level of the upper telephone control device 10. It is located. The upper telephone control device 10 has a function of bundling telephone control devices located below. Therefore, the telephone control device 1 can be connected to another LAN (not shown) connected to the wide area network 100 or the LAN 200 via the upper telephone control device 10.

As shown in FIG. 1, the telephone control device 1 includes a main control unit 11, an address management memory 12, a WAN side IP line control unit 13, a LAN side IP line control unit 14, and an extension telephone control unit 15. It enables you to send and receive). Although not shown, the main control unit 11 is a microprocessor provided with a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and a non-volatile memory, and controls each unit of the telephone control device 1. To do.

The address management memory 12 is configured by using, for example, a hard disk or an SSD (Solid State Drive), and provides address information about a device that may be called through the telephone control device 1 in order to realize a registrar server function. Retain memory. The main control unit 11 adds, changes, and deletes the address information to the address management memory 12.

The WAN side IP line control unit 13 enables a call through a network higher than the telephone control device 1. In this embodiment, the upper networks viewed from the telephone control device 1 are the LAN 200 and the WAN, which is the wide area network 100. As shown in FIG. 1, the LAN-side IP line control unit 14 is an IP to which the IP extension telephones 2 (1), 2 (2), ... Are connected and connected to a lower LAN when viewed from the telephone control device 1. It enables a call through the extension telephones 2 (1), 2 (2), .... As shown in FIG. 1, the extension telephone control unit 15 is connected to the extension telephones 3 (1), 3 (2), ..., And enables a call through the extension telephone (button telephone) connected to the own unit. To do.

The IP extension telephones 2 (1), 2 (2), ... Connected to the LAN side IP line control unit 14 are the LAN side IP line control unit 14 and the WAN side IP line control unit under the control of the main control unit 11. Through 13, it is possible to connect to the LAN 200 and the wide area network 100. Then, the IP extension telephones 2 (1), 2 (2), ... Can make a call with a telephone connected to the wide area network 100 or the LAN 200. Further, the IP extension telephones 2 (1), 2 (2), ... Connected to the LAN side IP line control unit 14 are telephones connected to a general public telephone line network (not shown) under the control of the main control unit 11. You will also be able to make calls with.

Extension telephones 3 (1), 3 (2), ... Connected to the extension telephone control unit 15 make a call with a telephone connected to a general public telephone network (not shown) under the control of the main control unit 11. To enable. Of course, the extension telephones 3 (1), 3 (2), ... Connected to the extension telephone control unit 15 pass through the extension telephone control unit 15 and the WAN side IP line control unit 13 under the control of the main control unit 11. It is possible to make a call with a telephone connected to the wide area network 100 or LAN 200.

Further, under the control of the main control unit 11, the LAN side IP line control unit 14 functions, and extension communication between IP extension telephones connected to the LAN side IP line control unit 14 is also possible. Similarly, under the control of the main control unit 11, the extension telephone control unit 15 functions, and an extension call between the extension telephones connected to the extension telephone control unit 15 is also possible. Further, under the control of the main control unit 11, the LAN side IP line control unit 14 and the extension telephone control unit 15 function, and the IP extension telephone and the extension telephone control unit 15 connected to the LAN side IP line control unit 14 function. Extension calls to and from the connected extension telephone are also possible.

In the communication system of this embodiment configured by using the telephone control device 1 having such a configuration, an IP address is assigned to each device as shown in FIG. That is, as shown in FIG. 1, "xxx.xxx.xxx.xxx" is assigned as a global IP address from the ISP (Internet Service Provider) side connected to the wide area network 100 to the upper telephone control device 10. Has been done.

Further, in this embodiment, the host telephone control device 10 assigns a private IP address to each of the own unit and the telephone control device 1 by the DHCP server function of the own unit. That is, the upper telephone control device 10 is assigned the IP address "192.168.1.10", and the telephone control device 1 is assigned the IP address "192.168.1.101". Although not shown in FIG. 1, when there is another telephone control device connected to the LAN 200, for example, the IP address such as "192.168.1.102" is the higher-level telephone control device 10. Will be assigned by.

Further, a private IP address is assigned by the telephone control device 1 to the IP extension telephones 2 (1), 2 (2), ... Connected to the telephone control device 1. In this embodiment, as shown in FIG. 1, the IP address "192.168.2.1" is assigned to the IP extension telephone 2 (1), and the IP address "192.168.2.1" is attached to the IP extension telephone 2 (2). Is assigned the IP address "192.168.2.2". It is assumed that the IP extension telephone 2 (1) is assigned the extension number "101" and the IP extension telephone 2 (2) is assigned the extension number "102". In addition, extension numbers are assigned to extension telephones 3 (1), 3 (2), ..., Which are conventional button telephones, and are managed by the telephone control device 1.

Next, the maintenance of the address management memory 12 performed by the main control unit 11 of the telephone control device 1 will be described. It is assumed that the main control unit 11 receives a request related to address information such as a registration request (register request) from various devices through the WAN side IP line control unit 13 and the LAN side IP line control unit 14. Requests for address information include registration requests, change requests, and deletion requests. The main control unit 11 extracts address information such as an IP (internet Protocol) address and a port number included in the received request. The main control unit 11 registers, changes, or deletes the address information in the address management memory 12 based on the received instruction content of the request and the extracted address information.

By using the address information registered and managed in the address management memory 12 in this way, the telephone control device 1 realizes a function as a proxy server. Specifically, when there is a call from the IP extension telephones 2 (1), 2 (2), ... To the device connected to the wide area network 100 or the device connected to the LAN 200, the main control unit 11 manages the address. The other party of the telephone is specified with reference to the memory 12. After that, the main control unit 11 connects the telephone line to the specified destination, and the WAN side IP line control unit so as to transmit the information (packet data) to be transmitted to the destination. 13 and the like are controlled.

Further, the address information registered and managed in the address management memory 12 is also used for determining an incoming call to the subordinate IP extension telephones 2 (1), 2 (2), ... Connected to the own machine. The telephone control device 1 receives an incoming call to a telephone under its own unit, notifies the target telephone of the incoming call, and when there is a response, connects a telephone line so that the telephone can make a call.

FIG. 2 is a diagram for explaining an example of stored data in the address management memory 12 of the telephone control device 1. The address management memory 12 of the telephone control device 1 is located above the own unit itself and the own unit, in addition to the address information of the subordinate IP extension telephones 2 (1), 2 (2), ... Connected to the own unit. The address information of the upper telephone control device 10 is also managed. Further, the address management memory 12 also contains the address information of a telephone terminal of another LAN connected to the LAN 200 or an external telephone terminal connected to the wide area network 100 and which may make a call. to manage.

Regarding the extension telephones 3 (1), 3 (2), ..., Information that can identify each of the extension telephones 3 (1), 3 (2), ..., Such as the extension number, is managed. In the following, in order to simplify the explanation, the IP telephone function is managed in the address management memory 12 by taking as an example the case where the IP telephone function can be used through the IP extension telephones 2 (1), 2 (2), ... A specific example of the address information will be described.

In the address management memory 12, as shown in FIG. 2, information such as a type, an IP address, a port number, and an extension number is managed. The type indicates whether the address information is for the own device, for the device located on the WAN side, or for the device located on the LAN side. The IP address assigned and notified to the telephone control device 1 of the own machine and the port number set for the own machine can be identified as the address information of the own machine.

The address information received through the WAN side IP line control unit 13 can be identified as the address information of a device located higher than the own machine. As described above, in this embodiment, the device located at the higher level means a device that can be connected through the WAN side IP line control unit 13, and includes a device connected to another LAN connected through the LAN 200. Further, the IP address and the port number received through the LAN side IP line control unit 14 can be identified as the address information of the lower-level device.

As described above, the WAN side IP line control unit 13 is an upper side interface for enabling connection with the upper side. Further, the LAN side IP line control unit 14 is a lower side interface for enabling connection with the lower side. Therefore, the main control unit 11 can determine the type of the address information from the upper level or the lower level by specifying through which route the address information is received.

In the address management memory 12, as shown in FIG. 2, the IP address is "192.168.1.101" and the port number is "6060" as the address information about the own unit (telephone control device 1). Is managed. Further, in the address management memory 12, the IP address is "192.168.1.20" and the port number is "5060" as the address information of the upper telephone control device 10 which is a higher-level device. It is managed.

Further, the address management memory 12 manages the address information of the IP extension telephones 2 (1), 2 (2), ... Connected to the LAN side IP line control unit 14. Specifically, as the address information of the IP extension telephone 2 (1), the IP address is "192.168.2.1", the port number is "6060", and the extension number is "101". It is managed. Further, as the address information of the IP extension telephone 2 (2), it is managed that the IP address is "192.168.2.2", the port number is "6060", and the extension number is "102". ing.

The port number is used in TCP / IP communication when designating an endpoint for inter-host communication, and specifically, is a number for identifying a program used by the device for communication. As mentioned above, the port number "5060" is managed by IANA to identify the use of programs that process voice packets.

In this embodiment, the host phone control device 10 uses "5060" as a port number that identifies the use of a program that processes voice packets. However, in the telephone control device 1 and the IP extension telephones 2 (1), 2 (2), ... Under the telephone control device 1, "6060" is used as a port number for identifying the use of the program for processing voice packets. Has been made. In addition to the information shown in FIG. 2, the address management memory 12 can also manage information such as a URI (Uniform Resource Locator) and a MAC (Media Access Control) address for each IP extension telephone. In the following, the port number "5060" used for the call is managed by IANA and is assumed to be a specified value.

[Configuration and operation of WAN side IP line control unit]
In the following, as shown by the dotted arrows in FIG. 1, for example, an IP telephone connected to the wide area network 100 and an IP extension telephone 2 (1), 2 (2), ... Consider the case of making a call between. Therefore, a call between, for example, an IP telephone connected to the wide area network 100 and, for example, an IP extension telephone 2 (1), 2 (2), ... It will be done via the telephone control device 10.

As described above with reference to FIG. 2, in the telephone control device 1, the port number used for the call uses "6060" instead of the specified value "5060" managed by IANA. Therefore, it is conceivable that the telephone control device 1 registers with the upper telephone control device 10 that the port number used for the call is "6060". However, the host telephone control device 10 is an existing device that has already been installed, and the manufacturer is different from the newly added telephone control device 10, so the registration of the port number used for the call is not accepted and the specified value. It is assumed that it is fixed so as to use "5060".

In this case, since the port number used for the call in the telephone control device 1 is "6060", a discrepancy occurs and the call cannot be made. Therefore, in the telephone control device 1, the WAN side IP line control unit 13 can monitor the port number of the message information regarding the call from the higher-level telephone control device 10 and change (rewrite) it as necessary. I am trying to do it.

FIG. 3 is a block diagram for explaining a configuration example of the WAN side IP line control unit 13 of the telephone control device 1. As shown in FIG. 3, in the WAN side IP line control unit 13, the internal side input / output unit 131, the call control unit 132, the routing control unit 133, and the WAN side I / F unit 134 are connected through the system bus 135. It is connected and configured. The internal side input / output unit 131 is connected to the internal side input / output end 132T connected to the bus 16 shown in FIG. 1, and the WAN side I / F unit 134 is connected to the WAN side connected to the LAN 200 shown in FIG. It is connected to the connection end 134T.

The internal input / output unit 131 performs information transmission / reception processing between the main control unit 11 of the telephone control device 1 and the call control unit 132 of the WAN side IP line control unit 13. The WAN side I / F unit 134 performs information transmission / reception processing between the upper telephone control device 10 and the routing control unit 133 of the telephone control device 1. The call control unit 132 generates and provides information to the routing control unit 133 based on the information from the main control unit 11, and information to the main control unit 11 based on the information from the routing control unit 133. Is generated and provided. The routing control unit 133 generates and provides information to the call control unit 132 based on the information from the upper telephone control device 10, and the routing control unit 133 to the upper telephone control device 10 based on the information from the call control unit 132. Generates and provides information on.

The message information regarding the call from the higher-level telephone control device 10 is supplied to the routing control unit 133 through the WAN side connection end 134T and the WAN side I / F unit 134. In this case, when the host telephone control device 10 fixes the destination port number to the specified value "5060", it is the port number related to the call used by the destination telephone control device 1. It is necessary to change (rewrite) to "6060". The routing control unit 133 is in charge of this process.

FIG. 4 is a block diagram for explaining a configuration example of the routing control unit 133 of the WAN side IP line control unit 13. As shown in FIG. 4, the routing control unit 133 includes a transmission message information input terminal 3Si, a transmission message information output terminal 3So, a reception message information input terminal 3Ri, and a reception message information output terminal 3Ro. In the following, the input end 3Si of the transmission message information is the transmission input end 3Si, the output end 3So of the transmission message information is the transmission output end 3So, the input end 3Ri of the received message information is the reception input end 3Ri, and the output of the received message information. The end 3Ro is described as a reception output end 3Ro. Further, the routing control unit 133 includes a NAT (Network Address Translation) unit 1331 as a main unit.

In general, the call control unit 132 and the routing control unit 133 function in response to the request from the main control unit 11, and as shown in the upper left corner of FIG. 4, the registration request (REGISTER) request is sent to the host telephone control device 10. To register the IP address and port number of the telephone control device 1. However, it is assumed that the upper telephone control device 10 has fixed the port number in the registration request from the lower telephone control device so as to always use the specified value "5060".

In this case, in the session participation request (INVITE) from the upper telephone control device 10 to the telephone control device 1, as shown in the upper right corner of FIG. 4, the destination port number is "6060" in which the registration request is made. Instead, it is created and transmitted using the specified value of "5060". That is, even if the correct IP address "192.168.1.101" assigned to the telephone control device 1 is specified as the destination IP address, the port number remains the specified value "5060". .. In this case, the NTA unit 1331 performs a process of changing the destination port number to the correct port number "6060". Hereinafter, the outgoing and incoming calls will be described in detail.

First, when making a call from, for example, the IP extension telephone 2 (1) connected to the LAN side IP line control unit 14 to the IP telephone connected to the wide area network 100, the telephone control device 1 and the upper telephone control device 10 are used. You can make a call via. In this case, the transmission message information SM1 is formed based on the functions of the LAN side IP line control unit 14 and the main control unit 11, and is received by the routing control unit 133 through the transmission input terminal 3Si. In the transmitted message information SM1, the information in the address management memory 12 is referred to, and as shown in the lower left portion of the routing control unit 133 in FIG. 4, the destination is the upper telephone control device 10 and the source is the telephone control device 1. Is to be. Of course, the transmitted message information SM1 also includes necessary information such as the telephone number of the IP telephone of the original destination.

In FIG. 4, in the message information SM1, "Dst Address" is an abbreviation for "destination address" and means a destination (destination) address. Similarly, "Dst Port" means a destination port number. Further, in the message information SM1, "Src Address" is an abbreviation for "source address" and means a source address. Similarly, "Src Port" means the source port number. This also applies to the other message information RM1 and RM2 shown in FIG.

In FIG. 4, in the transmitted message information SM1, there is no discrepancy in any of the destination IP address, the destination port number, the source IP address, and the source port number. Therefore, as shown in FIG. 4, the transmission message information SM1 is directly output through the transmission output terminal SMo in the NAT unit 1331 without any conversion, and is transmitted to the host telephone control device 10.

On the other hand, it is assumed that an incoming call request is generated from an IP telephone connected to the wide area network 100 to, for example, the IP extension telephone 2 (1) connected to the LAN side IP line control unit 14 of the telephone control device 1. Even in this case, the incoming call request from the IP telephone connected to the wide area network 100 is notified to the telephone control device 1 via the upper telephone control device 10. The incoming call request transmitted from the host telephone control device 10 is received by the routing control unit 133 as received message information through the reception input terminal 3Ri.

The received message information RM1 received by the routing control unit 133 has a transmission destination of the telephone control device 1 and a transmission source of the upper telephone control device 10 as shown in the upper right end of the routing control unit 133 of FIG. Is. Of course, the received message information RM1 also includes necessary information such as the telephone number of the IP extension telephone of the original destination. In this case, although the port number of the telephone control device 1 which is the transmission destination is "6060", it is a specified value "5060" as shown with an underline.

Therefore, regarding the received message information RM1, as shown in the lower right portion of the routing control unit 133 in FIG. 4, the NAT unit 1331 changes the destination port number from “5060” to “6060”. I do. In this case, simply changing the destination port number may not be accurate.

For example, although not shown in FIGS. 1 and 2, the WAN side IP line control unit 13 is provided with a LANI / F unit for maintenance. Therefore, it is necessary to ensure that the message information received through the maintenance LANI / F unit is not mistaken for the message information from the host telephone control device 10. Further, unless it is confirmed that the destination of the received message information is the telephone control device 1, the source is the upper telephone control device 10, and the port number of the destination is the specified value "5060", the information is transmitted. The destination port number cannot be changed (rewritten) properly. The destination address and source address of the received message information may be different, and the destination port number may be another port number other than "5060".

Therefore, when changing the destination port number, the routing control unit 133 confirms each of the I / F unit that received the received message, the destination IP address, the source IP address, and the destination port number. , Change the destination port number. Therefore, the routing control unit 133 is provided with a reception I / F determination unit 311, a transmission destination address determination unit 312, a source address determination unit 313, a transmission destination port determination unit 314, and a port change processing unit 315.

The reception I / F determination unit 311 determines whether or not the received message information received by the routing control unit 133 is received through the WAN side I / F unit 134. This determination can be performed, for example, based on the presence / absence of information added to the received message information when passing through the WAN side I / F unit 134 or the content of the added information. Further, when the WAN side I / F unit 134 receives the received message information and outputs it to the routing control unit 133, the WAN side I / F unit 134 notifies the routing control unit 133 that the message information has been output. You may do so. In this case, the routing control unit 133 determines whether the reception I / F determination unit 311 is the received message information received through the WAN side I / F unit 134, depending on the presence / absence and content of the notification from the WAN side I / F unit 134. Can be determined.

The destination address determination unit 312 determines whether or not the IP address of the destination of the received message information is the same as the IP address "192.168.1.101" assigned to the own machine managed by the address management memory 12. To determine. In the source address determination unit 313, the IP address of the source of the received message information is the IP address "192.168.1.20" assigned to the upper telephone control device 10 managed by the address management memory 12. Determine if they are the same. In the destination port determination unit 314, the port number of the destination of the received message information is not the specified value "5060", but the port number "6060" assigned to the own machine managed by the address management memory 12. Determine if they are the same.

It is assumed that positive discrimination results are obtained in each of the receiving I / F discriminating unit 311, the destination address discriminating unit 312, the source address discriminating unit 313, and the destination port discriminating unit 314. Then, it is assumed that the destination port determination unit 314 determines that the destination port number is "5060" and not "6060". In this case, the port change processing unit 315 changes the destination port of the received message information RM1 from "5060" to "6060". The received message information whose destination port number has been changed is output from the reception output terminal 3Ro and supplied to the main control unit 11.

That is, it was determined that the I / F unit that received the received message information RM1 by the reception I / F determination unit 311 was the WAN side I / F unit 134 (first condition). The destination address determination unit 312 determines that the destination IP address of the received message information RM1 is assigned to the telephone control device 1 and matches the IP address (second condition). The source address determination unit 313 determines that the source IP address of the received message information RM1 is assigned to the upper telephone control device 10 and matches the IP address (third condition). The destination port determination unit 314 determines that the destination port number of the received message information RM1 matches the specified value "5060" and is not "6060" set in the own machine (fourth condition). It is assumed that the four conditions are met.

In this case, the port change processing unit 315 forms the received message information RM2 in which the destination port of the received message information RM1 is changed from "5060" to "6060", and outputs the received message information RM2. As a result, even if the destination port number is the specified value "5060" in the received message information from the host telephone control device 10, it is possible to appropriately correct the destination port number and make a call.

[Communication processing for incoming and outgoing calls]
Next, the processing performed by the communication system of this embodiment at the time of incoming call and the time of outgoing call will be described centering on the telephone control device 1. Also in the following, the port number of the destination of the message information related to the call transmitted to the lower telephone control device by the upper telephone control device 10 is always a specified value regardless of the registration request from the lower telephone control device. "5060" is used.

<Processing when receiving an incoming call>
First, a process performed by the communication system of this embodiment when an incoming call occurs to the IP extension telephone 2 (1) under the telephone control device 1 will be described. Here, for example, it is assumed that an IP telephone connected to the wide area network 100 makes a call to the IP extension telephone 2 (1) under the telephone control device 1. In the following, details regarding transmission / reception of message information between the host telephone control device 10 and the source IP telephone connected to the wide area network 100 will be omitted.

5 and 6 are sequence diagrams for explaining processing when an incoming call occurs in the IP extension telephone 2 (1) under the telephone control device 1. In FIGS. 5 and 6, the port numbers shown in each step are the destination port number on the left side and the source port number on the right side. As shown in the upper right corner of FIG. 5, an IP telephone connected to the wide area network 100 makes a call to the IP extension telephone 2 (1) under the telephone control device 1, and an incoming call corresponding to the call is made to the upper telephone control device. It is assumed that the notification is given to 10 (step S1).

The higher-level telephone control device 10 forms a session participation request (INVITE message) in response to the incoming call, and transmits this to the telephone control device 1 (step S2). In the session participation request, the destination is the telephone control device 1 and the source is the upper telephone control device 10. As shown in FIG. 5, the port number of the destination is set to the specified value "5060". The source port number is "5060".

The session participation request is received by the WAN side IP line control unit 13 of the telephone control device 1. As described with reference to FIG. 4, the routing control unit 133 undergoes four checks (discrimination processing) of the receiving I / F, the destination address, the source address, and the destination port, and if necessary, the destination. The port number is changed (step S3). In the case of this example, the reception I / F of the session participation request is the WAN side I / F unit 134, the destination address is "192.168.1.101", and the source address is "192". It is ".168.1.20" and the destination port is "5060".

Therefore, since it is known that the destination port number needs to be changed, in the process of step S3, the port change processing unit 315 of the routing control unit 133 changes the destination port number of the session participation request from "5060". Change to "6060". After that, the session participation request in which the destination port number is changed to "6060" is sent to the call control unit 132 (step S4).

The call control unit 132 analyzes the session participation request supplied to the call control unit 132, first forms a message notifying "100" during the trial, and sends this to the routing control unit 133 (step S5). In this case, the message indicating "100" during the enforcement is that the destination is the upper telephone control device 10 and the transmission source is the telephone control device 1. Therefore, the destination port number is "5060" and the source port number is "6060". The routing control unit 133 transmits the message indicating “100” during execution from the call control unit 132 to the host telephone control device 10 as it is (step S6).

Further, the call control unit 132 forms a call setting request (SETUP) and sends it to the main control unit 11 in the own machine (step S7). The main control unit 11 forms a message indicating that the call is being processed (CALLPROC), and sends this to the call control unit 132 (step S8). Further, the main control unit 11 forms a reception request, sends it to the IP extension telephone 2 (1) which is the destination of the call through the LAN side IP line control unit 14, and makes a call (step S9). After that, the main control unit 11 forms a message indicating that the call is in progress (ALERT), and sends this to the call control unit 132 (step S10). Further, the main control unit 11 continues the call to the IP extension telephone 2 (1) of the called destination (step S11).

After that, the call control unit 132 forms a message indicating "180" during the call, and sends this to the routing control unit 133 (step S12). Since the destination of the message is the upper telephone control device 10 and the source is the telephone control device 1, the destination port number is "5060" and the source port number is "6060". is there. The routing control unit 133 transmits the message indicating "180" during the call from the call control unit 132 to the host telephone control device 10 as it is (step S13).

When the higher-level telephone control device 10 receives the message indicating "180" during the call, it forms a confirmation request (PRACK) and transmits this to the telephone control device 1 (step S14). In this confirmation request, the destination is the telephone control device 1, the source is the upper telephone control device 10, the destination port is the specified value "5060", and the source port is also "5060". Is.

Therefore, the routing control unit 133 that has received the confirmation request performs confirmation processing and change processing in the same manner as the processing in step S3, and forms a confirmation request in which the destination port number is changed from "5060" to "6060". (Step S15). The confirmation request for which the destination port number has been changed is sent to the call control unit 132 (step S16).

Next, proceeding to the process shown in FIG. 6, the call control unit 132 forms a message indicating OK “200” and sends this to the routing control unit 13 (step S17). The routing control unit 133 transmits the message indicating OK “200” from the call control unit 132 to the host telephone control device 10 as it is (step S18). Here, the message indicating OK "200" indicates that the sequence of connection of the session is proceeding normally.

After that, when a response operation (off-hook operation) is performed on the destination IP extension telephone 2 (1), a response message is sent from the IP extension telephone 2 (1) to the main control unit 11 through the LAN side IP line control unit 14. Is coming (step S19). The main control unit 11 forms a response (CONNECT) message indicating that the IP extension telephone 2 (1) has answered, and sends this to the call control unit 132 (step S20). The call control unit 132 forms a response confirmation (CONNECTACK) and sends this to the main control unit 11 (step S21). As a result, the main control unit 11 is notified that the response message has been received.

The call control unit 132 forms a message indicating OK “200” indicating that the answer operation has been performed by the IP extension telephone 2 (1) of the called destination, and sends this to the routing control unit 133 (step S22). Since the destination of the response in this case is the upper telephone control device 10, the destination port is "5060", and the source is the telephone control device 1, so the source port is "6060". The routing control unit 133 transmits the message indicating OK “200” from the call control unit 132 to the host telephone control device 10 as it is (step S23).

After that, the host telephone control device 10 forms a final response confirmation (ACK) and transmits this to the telephone control device 1 (step S24). The destination of the confirmation is the telephone control device 1, but the destination port is set to the specified value "5060", and the source is the upper telephone control device 10, so the source port number is set to "5060". Upon receiving the confirmation, the routing control unit 133 performs confirmation processing and change processing in the same manner as in steps S3 and S15 described above, and sends a confirmation message in which the destination port number is changed from "5060" to "6060". Form (step S25). Here, the confirmation message in which the destination port has been changed is sent to the call control unit 132 (step S26).

As a result, the call control unit 132 and the main control unit 11 function to connect a call line between the source IP telephone connected to the wide area network 100 and the destination IP extension telephone 2 (1). The call is made (step S27). In this way, even if the host telephone control device 10 fixes the destination port number to the specified value "5060" and is different from the port number "6060" used in the destination telephone control device 1, there is no problem. You will be able to make calls without. That is, even when an incoming call occurs to the IP extension telephone 2 (1) under the telephone control device 1, it is possible to make a call without any trouble.

<Processing when making a call>
Next, a process performed by the communication system of this embodiment when a call is made from the IP extension telephone 2 (1) under the telephone control device 1 will be described. Here, for example, it is assumed that a telephone call is made from the IP extension telephone 2 (1) under the telephone control device 1 to the IP telephone connected to the wide area network 100. In the following, details regarding transmission / reception of message information between the host telephone control device 10 and the source IP telephone connected to the wide area network 100 will be omitted.

7 and 8 are sequence diagrams for explaining processing when a call is made from the IP extension telephone 2 (1) under the telephone control device 1. In FIGS. 7 and 8, the port numbers shown in each step are the destination port number on the left side and the source port number on the right side. As shown in the upper left corner of FIG. 7, the outgoing call request from the IP extension telephone 2 (1) connected to the telephone control device 1 is notified to the main control unit 11 through the LAN IP line control unit 14 (step S31).

In response to this, the main control unit 11 forms a call setting request (SETUP) and sends it to the call control unit 132 (step S32). When the call control unit 132 receives the call setting request, it forms a call processing message (CALLPROC) and sends it to the main control unit 11 (step S33). In response to this, the main control unit 11 forms a reception response, sends it to the source IP extension telephone 2 (1), and notifies that the transmission request has been accepted (step S34).

After that, the call control unit 132 forms a session participation request (INVITE) and sends it to the routing control unit 133 (step S35). In the request, the destination is the upper telephone control device 10, the source is the telephone control device 1, the destination port number is "5060", and the source port number is "6060". is there. The routing control unit 133 transmits the session participation request as it is to the host telephone control device 10 (step S36).

A message indicating "100" is formed from the upper telephone control device 10 during the trial, and this is transmitted to the telephone control device 1 (step S37). In this message, the destination is the telephone control device 1 and the source is the higher-level telephone control device 10. The destination port number is set to "5060" with the specified value, and the source port number is also "5060". It is the one that has become. Therefore, the routing control unit 133 of the telephone control device 1 undergoes four checks (discrimination processing) of the receiving I / F, the destination address, the source address, and the destination port, as described with reference to FIG. , If necessary, change the destination port number (step S38).

In the case of this example, the receiving I / F of the message of "100" during the trial is the WAN side I / F unit 134, the destination address is "192.168.1.101", and the source. The address is "192.168.1.20" and the destination port is "5060". Therefore, since it is known that the destination port number needs to be changed, the port change processing unit 315 of the routing control unit 133 changes the destination port number of the response from "5060" to "6060" (step). S38). After that, the message whose destination port number is changed to "6060" is sent to the call control unit 132 (step S39).

After that, a message indicating "180" being called is transmitted from the upper telephone control device 10 to the telephone control device 1 (step S40). For this message as well, the routing control unit 133 changes the destination port number “5060” to “6060” in the same manner as in the process of step S38 (step S41). A message indicating "180" during the call after the change in which the destination port number is changed in this way is sent to the call control unit 132 (step S42). The call control unit 132 forms a confirmation request (PRACK) and sends it to the routing control unit 133 (step S43). In this case, the routing control unit 133 transmits the confirmation request transmitted from its own unit to the host telephone control device 10 as it is (step S44).

After that, a message indicating OK "200" is transmitted from the upper telephone control device 10 to the telephone control device 1 (step S45). In the message, the destination is the telephone control device 1, the source is the upper telephone control device 10, the destination port number is set to the specified value "5060", and the source port number is also set to "5060". It is a thing. Therefore, the routing control unit 133 changes the destination port number of the message indicating OK “200” from “5060” to “6060” in the same manner as in step S46 (step S51). The changed message is sent to the call control unit 132 (step S52).

The call control unit 132 that has received the message indicating OK "200" forms a response confirmation (ACK) and sends this to the routing control unit 133 (step S53). The routing control unit 133 transmits the response confirmation as it is to the host telephone control device 10 (step S54). After that, the call control unit 132 sends a response message to the main control unit 11 (step S55).

As a result, the call control unit 132 and the main control unit 11 function to connect a call line between the source IP extension telephone 2 (1) connected to the wide area network 100 and the call source IP telephone. Then, the call is made (step S56). As a result, even when a call is made from the IP extension telephone 2 (1) under the control device 1, the call can be made without any trouble.

[Effect of Embodiment]
In the case of the telephone control device 1 of the above-described embodiment, there is a communication system having a configuration in which the telephone control device 1 located at the lower level is always connected to another network via the upper telephone control device 10 located at the upper level. Suppose it is configured. In this case, even if the host telephone control device 10 always uses the specified value "5060" as the destination port number, the destination port number can be appropriately changed to the one used in the telephone control device 1. it can. The destination port number can be changed only when the telephone control device 1 appropriately confirms whether or not the destination port may be changed and may change the destination port. Therefore, it is possible to make a call without any trouble. Of course, this is effective both when receiving a call from the telephone under the telephone control device 1 and when making a call from the telephone under the control of the telephone control device 1.

[Modification example]
In the above-described embodiment, the case where the port number is changed from "5060" to "6060" has been described as an example, but this is an example. The port number before the change and the port number after the change can be appropriate port numbers according to the port numbers used in each device constituting the configured communication system.

Further, in the above-described embodiment, as described with reference to FIG. 4, four items of the receiving I / F, the destination address, the source address, and the destination port number are discriminated, but this is not necessarily the case. Not limited. If the source is fixed or the receiving I / F is fixed depending on the connection status of the devices that make up the communication system, the I / F configuration of the device, etc., at least the destination port number You only have to check.

That is, although it is absolutely necessary to confirm the destination port number, the reception I / F, the destination address, and the source address should be confirmed according to the system configuration and the I / F status of the own machine. do it. Therefore, with respect to the receiving I / F, the destination address, and the source address, it is possible to appropriately use any one or more confirmations.

[Other]
The port number changing method used in the telephone control device which is located below the predetermined upper telephone control device and can be connected to another network via this upper telephone control device is as follows. .. That is, (1) the destination port determination means includes a destination port determination step of determining whether or not the destination port number matches the call port number of the own device in the received message information. Further, in the (2) destination port determination step, when it is determined that they do not match, the conversion means converts the destination port number of the received message information into the call port number of the own device. To be equipped.

Further, as described with reference to FIG. 4, the reception I / F determination step by the reception I / F determination unit 311, the destination address determination step by the transmission destination address determination unit 312, and the transmission by the transmission source address determination unit 313. One or more of the original address determination steps may be performed.

Further, the functions of the reception I / F determination unit 311 of the NAT unit 1331, the destination address determination unit 312, the source address determination unit 313, and the port change processing unit 315 described with reference to FIG. 4 are predetermined control units. The function can be realized by the program executed by. The predetermined control unit is configured to include a CPU, a ROM, a RAM, and the like. Of course, a program in which the functions of the call control unit 132 and the routing control unit 133 of the WAN side IP line control unit 13 described with reference to FIG. 3 are executed by the control unit including the CPU, ROM, RAM, and the like. It can also be realized by.

1 ... Telephone control device, 11 ... Main control unit, 12 ... Address management memory, 13 ... WAN side IP line control unit, 131 ... Internal side input / output unit, 131T ... Internal side connection end, 132 ... Call control unit 133 ... Routing control unit, 1331 ... NAT unit, 311 ... Reception I / F determination unit, 312 ... Destination address determination unit, 313 ... Source address determination unit, 314 ... Destination port determination unit, 315 ... Port change processing unit, 3Si ... transmission input end, 3So ... transmission output end, 3Ri ... reception input end, 3Ro ... reception output end, 134 ... WAN side I / F unit, 134T ... WAN side connection end, 14 ... LAN side IP line control unit, 15 ... Extension telephone control unit, 2 (1), 2 (2) ... IP extension telephone, 3 (1), 3 (2) ... Extension telephone, 4 ... PC, 5 ... NW device, 10 ... Upper telephone control device, 20 ... Router, 30 ... ONU, 100 ... wide area network, 200 ... LAN

Claims (6)

A telephone control device that is located below a predetermined higher-level telephone control device and is connected to another network via the higher-level telephone control device.
A destination port determination means for determining whether or not the destination port number of the received message information matches the call port number set in the own device,
When the destination port determination means determines that they do not match, the destination port number of the received message information is changed to the port number for the call set in the own machine. A telephone control device characterized by. The telephone control device according to claim 1.
An upper interface means for receiving the message information from the upper telephone control device, and
It is provided with a receiving interface determining means for determining whether or not the received message information is received through the higher-level interface.
The destination port discriminating means is a telephone control device, characterized in that the receiving interface discriminating means performs a discriminating process when it is determined that the port has been received through the higher-level interface. The telephone control device according to claim 1.
A destination address determination means for determining whether or not the destination address information of the received message information matches the address information assigned to the own machine is provided.
The destination port determination means is a telephone control device that performs a determination process when the destination address determination means determines that they match. The telephone control device according to claim 1.
A source address determination means for determining whether or not the source address information of the received message information matches the address information of the upper telephone control device grasped by the own machine is provided.
The destination port determination means is a telephone control device that performs a determination process when the source address determination means determines that they match. The telephone control device according to claim 1.
An upper interface means for receiving the message information from the upper telephone control device, and
A receiving interface determining means for determining whether or not the received message information is received through the upper interface, and
A destination address determination means for determining whether or not the destination address information of the received message information matches the address information assigned to the own machine, and
It is provided with a source address determination means for determining whether or not the source address information of the received message information matches the address information of the upper telephone control device grasped by the own machine.
The destination port discriminating means is determined by the receiving interface discriminating means to have been received through the upper interface, and the destination address discriminating means has grasped the destination address by the own machine. A telephone control device characterized in that it is determined that they match, and when the source address determining means determines that the source address matches a person grasped by the own machine, a determination process is performed. There is a port number changing method used in a telephone control device that is located below a predetermined higher-level telephone control device and can be connected to another network via the higher-level telephone control device.
A destination port determination step in which the destination port determination means determines whether or not the destination port number matches the call port number of the own device in the received message information.
In the destination port determination step, when it is determined that they do not match, the conversion means includes a conversion step of converting the destination port number of the received message information into the call port number of the own device. Characteristic port number change method.

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