JP2005269368A - Communication apparatus, communication method, and program thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform the normal transmission/reception operation of multi-media data even between terminals which belong to the same communication network. <P>SOLUTION: A transmission source address acquiring means 13 acquires the external address/port number of an opposite terminal from media information and storing it in an opposite apparatus address storage means 12. A comparing means 14 compares the address/port number with own external address stored in an own apparatus address storage means 11. In the case of coincidence, an internal address/port number corresponding to the external address/port number of the opposite terminal is acquired from a router 4 through the use of an address requesting means 16 and an address receiving means 17. Then, a second setting means 18 sets the internal address/port number to the address/port number in data transmission/reception together with the own internal address/port number. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a technology for performing communication in which a plurality of pieces of information such as audio and video are integrated.

  Conventionally, when communication is performed via an IP communication network (hereinafter referred to as an IP network), different addresses are used to identify communication devices such as terminals serving as communication arrival and departure points. In addition, when a plurality of types of information such as voice and video are communicated between communication devices, the type of information and the type of incoming and outgoing calls are specified by using a port (also referred to as a sub-address). In other words, when communicating by integrating a plurality of types of information, it is necessary to acquire not only an address but also a plurality of ports before starting communication in order to specify a combination of a communication device and information type. For example, when communicating with audio and video one-on-one with a communication device on the other side, for audio transmission / reception, transmission / reception of communication status information such as the number of lost received packets and transmission packets, video transmission, It was necessary to use six ports for each terminal for receiving communication status information, receiving video, and transmitting the communication status information.

  In Patent Document 1, a set of port numbers and addresses that differ for each device or each type of information is transmitted to the number management means as request information from the terminal, and the device or Means for communicating by specifying the type of information is disclosed.

  In many cases, the number management means is provided in a relay means (router) that relays communication between a wide area communication network (hereinafter referred to as an external network) and a terminal. When communicating between terminals belonging to a closed communication network (hereinafter referred to as internal network) under the same router, each terminal can use an internal network address and port number (hereinafter referred to as internal address / Port number). On the other hand, when communicating with a device on an external network via a router, an external network address and a port number (hereinafter referred to as an external address / port number) for connecting the terminal to the external network are used. . The external address / port number is acquired from the router by each terminal at least before the start of communication with a device on the external network.

  When the router relays the communication information received from the terminal on the internal network and transmits it to the external network, the router determines the source address / port number in the communication information based on the address / port number management table as shown in FIG. Rewrite to external address / port number. Further, when relaying communication information received from a device on an external network and transmitting it to the internal network, the transmission destination address / port number in the communication information is determined based on the internal address / port number management table as described above. Rewrite the port number. Hereinafter, such an address / port number conversion function in the router is referred to as a NAT (Network Address Translation) function. In the present application, the so-called IP masquerade function is described as being included in the NAT function.

  Incidentally, SIP (Session Initiation Protocol) is known as one of protocols for handling multimedia data such as audio and video images in an IP network and supporting these applications. A typical session start process in SIP uses a communication connection device (a SIP server as an example) having means for recording an address related to a user's communication device, and records the address of the communication device of the destination (the other party). If not, a search request signal is transmitted to the same type of communication connection device, and a destination record signal indicating that the destination address is recorded is received from the recorded communication connection device. By this process, a communication connection device that records the destination address is searched, and the call information is transmitted from the communication connection device to the destination communication device.

  First, a terminal (own terminal) that calls a terminal that is a communication partner (partner terminal) sends call information (INVITE request) to the partner terminal to the SIP server (own SIP server) in its own domain. Send. The local SIP server that has received the call information relays the call information and transmits it to the SIP server in the domain of the partner terminal (the partner SIP server). The partner SIP server that has received the call information transfers the call information to the target partner terminal. As a result, the partner terminal notifies the user that it is being called (incoming call). Here, if the user of the other terminal instructs the other terminal to accept the incoming call in response to the call, the incoming call acceptance information is transmitted to the own terminal via the same route as the call information. When the own terminal receives this incoming call acceptance information, it is information on multimedia data communicated in the session between the own terminal and the other terminal without going through any SIP server. Negotiation is performed by exchanging SDP (Session Description Protocol) media information including port number information (because multimedia data includes types of audio and video encoding means or decoding means, and for operating them. There are conditions such as audio sampling frequency, video size, frame rate, etc., and if these conditions do not match between the source and destination, data cannot be sent and received. To confirm that the above conditions are met)), a multimedia session is established. Thereafter, transmission / reception of actual multimedia data is started using a protocol such as RTP (Real-time Transport Protocol).

In addition, when the own terminal and the partner terminal exist in the same domain, as a matter of course, there is only one SIP server that relays the call information.
JP 2000-216852 A

  However, when the terminal on the internal network accesses the SIP server on the external network via the router having the NAT function described above and calls the other terminal on the same internal network as the local terminal, the source of the IP packet Although the address / port number and the destination address / port number are converted by the router, the source address / port number included in the SDP media information is information in the message data in the SDP media information and can be rewritten by the router. Therefore, there is a problem that normal transmission / reception of multimedia data cannot be performed.

  In other words, communication with a device outside the communication network to which it belongs is performed using an address in the first network system (for example, the aforementioned external address / port number), and communication with a device within the communication network to which it belongs is Communication between one communication device using an address (for example, the above-described internal address / port number) in the network system 2 and other communication devices in the communication network to which it belongs. The call information and the incoming call acceptance information are exchanged through the connection device (for example, the above-described SIP server), and then the media information including the transmission source address (for example, the above-mentioned SDP media information) is exchanged and indicated in the matched media information. When sending and receiving multimedia data under certain conditions, the source address included in the media information is the media information. Normal transmission / reception operation of multimedia data because it is information in message data and is not rewritten by a relay means having an address conversion function between an address in the first network system and an address in the second network system There was a problem that could not be done.

  Therefore, it is expected that the multimedia data can be normally transmitted and received even if the belonging communication network is between the same terminals.

In order to solve the problem, in the present invention, communication with a device outside a communication network to which the user belongs belongs using an address in the first network system, and communication with a device within the communication network to which the user belongs belongs to the second network system. A communication device that uses the address in the network, and exchanges call information and incoming call acceptance information with the communication destination communication device through a communication connection device outside the communication network to which the device belongs, and thereafter with the communication destination communication device. In the communication device that exchanges the media information including the transmission source address and transmits and receives multimedia data under the conditions indicated in the matched media information,
The own apparatus address storage means for storing the address in the first network system and the address in the second network system acquired prior to the exchange of the call information and the incoming call acceptance information, and the address of the communication destination communication apparatus are stored. A partner device address storage unit; a source address acquisition unit for acquiring an address in the first network system of the communication destination communication device from the source address included in the received media information, and storing the address in the partner device address storage unit; A comparing means for comparing the address in the first network system stored in the own apparatus address storage means with the address in the first network system of the communication destination communication apparatus stored in the counterpart apparatus address storage means; As a result of the comparison, the address in the first network system of itself and the first network of the destination communication device If the address in the network system is different, the address in the first network system stored in the own apparatus address storage means and the first network system in the communication destination communication apparatus stored in the counterpart apparatus address storage means And the first setting means for setting the address of the first communication system and the address of the communication destination communication device to the address of the communication destination communication device. In the second network system corresponding to the address by transmitting the address in the first network system of the communication destination communication device stored in the counterpart device address storage means. Address request means for requesting the address of the second communication device, and a second network corresponding to the address in the first network system of the communication destination communication device Address receiving means for receiving an address in the network system and replacing it with the address in the first network system stored in the partner apparatus address storage means, and stored in the own apparatus address storage means The address in the second network system of the communication destination communication device stored in the address in the second network system and the partner device address storage means is used as the address of itself and the communication destination communication device at the time of data transmission / reception. And a second setting means for setting.

  The subject is a first step in which the control device obtains an address in the first network system of the communication destination communication device from the transmission source address included in the received media information, and stores it in the counterpart device address storage means. And the first address of the communication destination communication device stored in the own device address storage means and the address in the first network system acquired and stored in the own device address storage means prior to the exchange of the call information and the incoming call acceptance information. The second step of comparing the address in the network system of the first network system, and if the result of the comparison shows that the address in the first network system of its own is different from the address in the first network system of the communication destination communication device Before the exchange of information and incoming call acceptance information, it is acquired in the first network system of its own stored in its own device address storage means. And the third step of setting the address in the first network system of the communication destination communication device stored in the address and the counterpart device address storage means to the address of itself and the communication destination communication device at the time of data transmission / reception As a result, when the address in the first network system of the communication device and the address in the first network system of the communication destination communication device are the same, the first communication device communication device stored in the counterpart device address storage means A fourth step of transmitting an address in the network system and requesting an address in the second network system corresponding to the address in the first network system; and a first network system of the communication destination communication device The first network system receives an address in the second network system corresponding to the address of the first address, and stores the address in the counterpart device address storage means. A fifth step of storing in place of an address in the network system, and an address in the second network system of the second apparatus acquired and stored in the own apparatus address storage means prior to the exchange of the call information and the incoming call acceptance information; A communication method for executing the sixth step of setting the address in the second network system of the communication destination communication device stored in the counterpart device address storage means to the address of the communication destination communication device itself and the data transmission / reception Alternatively, the problem can be solved by a communication program that causes a computer to execute the above-described procedure.

  In the communication apparatus of the present invention, by providing the above-described means, if the address in the first network system of the communication destination communication apparatus included in the media information is the same as the address in its own first network system, An address in the second network system corresponding to the address in the first network system of the communication destination communication apparatus is acquired, and data is transmitted and received using this and the address in the second network system of its own. For this reason, even when a communication connection device outside the communication network to which the terminal belongs is accessed from one terminal via the relay means and another terminal on the same communication network is called, normal multimedia data transmission / reception can be performed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 2 shows the entire audio / video data communication system including the communication apparatus of the present invention. In the figure, reference numerals 1a, 1b, and 1c denote communication apparatuses (terminals A, B, and C), and reference numeral 2 denotes terminals A and B. 3 is an external network to which the terminal C is connected, 4 is a router for connecting and relaying the internal network 2 and the external network, and 5 is a SIP server on the external network.

  Here, among terminals A, B, and C, at least terminals A and B are communication devices having the functions according to the present invention, and router 4 has an address / port number management table as shown in FIG. And has a known NAT function. FIG. 2 shows an example of addresses of each terminal and router.

  FIG. 3 shows an example of an embodiment of a communication apparatus according to the present invention. Here, only functional parts related to the present invention are shown. That is, reference numeral 11 denotes own device address storage means for storing the external address / port number and the internal address / port number of the own device (own terminal) acquired prior to the session start processing based on SIP. Reference numeral 12 denotes a partner apparatus address storage means for storing the address and port number of the communication apparatus (partner terminal) of the communication partner.

  Reference numeral 13 denotes transmission source address acquisition means, which acquires the external address / port number of the counterpart terminal from the transmission source address / port number included in the media information received from the counterpart terminal and stores it in the counterpart apparatus address storage means 12. .

  Reference numeral 14 denotes a comparison means for comparing the external address of the own terminal stored in the own apparatus address storage means 11 with the external address of the opposite terminal stored in the counterpart apparatus address storage means 12.

  Reference numeral 15 denotes first setting means. If the external address of the own terminal is different from the external address of the counterpart terminal as a result of the comparison, the external address / port of the own terminal stored in the own apparatus address storage means 11 The external address / port number of the partner terminal stored in the number and partner apparatus address storage means 12 is set as the address / port number of the own terminal and the partner terminal at the time of data transmission / reception.

  Reference numeral 16 denotes an address request means. If the external address of the own terminal and the external address of the counterpart terminal are the same as a result of comparison, the address request means 16 of the counterpart terminal stored in the counterpart apparatus address storage means 12 with respect to the router 4 An external address / port number is transmitted to request an internal address / port number corresponding to the external address / port number.

  Reference numeral 17 denotes an address receiving means for receiving an internal address / port number corresponding to the external address / port number of the counterpart terminal returned from the router 4 and storing the internal address / port number in the counterpart apparatus address storage means 12. Replace with external address / port number and store.

  Reference numeral 18 denotes second setting means, which includes the internal address / port number of the own terminal stored in the own apparatus address storage means 11 and the internal address / port number of the counterpart terminal stored in the counterpart apparatus address storage means 12. The address and port number of the own terminal and the partner terminal at the time of data transmission / reception are set.

  FIG. 4 is a sequence diagram of the communication operation in the embodiment when the terminal A is the caller (calling side) and the terminal C on the external network 3 is the callee (response side). In the following, the operation of the present embodiment will be described along with this. Both terminals A and C are activated, and the number of address / port numbers required for transmission / reception of multimedia data (the number of terminals A required by terminal A) External address / port number and internal address / port number) are acquired and stored.

  When the user of the terminal A instructs the terminal A to call the terminal C, the terminal A transmits call information to the terminal C to the SIP server 5 as described in the background art. The SIP server 5 that has received the call information transfers the call information to the target terminal C. The terminal C that has received the call information notifies the user of the fact that it is being called by a screen display, a ringing tone, etc. (incoming call). Here, if the user of the terminal C instructs the terminal C to accept the incoming call in response to the call, the terminal C transmits the incoming call acceptance information to the terminal A through the same route as the call information.

  When the terminal A receives the incoming call acceptance information, the terminal A and the terminal C negotiate by exchanging SDP media information including information on the source address and port number without going through the SIP server 5 thereafter. Furthermore, the terminal A performs address conversion as follows.

  First, the transmission source address acquisition unit 13 acquires the transmission source address / port number from the SDP media information received from the terminal C, that is, the external address / port number of the terminal C, and stores it in the counterpart device address storage unit 12.

  Next, the comparison means 14 compares the external address of itself (terminal A) stored in the own apparatus address storage means 11 with the external address of terminal C stored in the counterpart apparatus address storage means 12. In this case, the external address of terminal A is “210.xxx.xxx.001”, and the external address of terminal C is “220.yyy.yyy.001”, which are different.

  For this reason, the first setting means 15 converts the own external address / port number stored in the own apparatus address storage means 11 and the external address / port number of the terminal C stored in the counterpart apparatus address storage means 12 into the data To the address and port number of the terminal C and itself when transmitting / receiving the message.

  Thereafter, transmission / reception of actual multimedia data between the terminal A and the terminal C using the external address / port number of the terminal A and the external address / port number of the terminal C is started.

  Thereafter, when the user of terminal A or terminal C instructs the terminal to end, communication end information is transmitted from terminal A or terminal C to the other terminal. Ends.

  FIG. 5 is a sequence diagram of the communication operation in the above embodiment when the terminal A is the source (calling side) and the terminal B on the internal network 2 is the destination (response side). In the following, the operation of the present embodiment will be described along with this, but each terminal A, B is activated, and the number of external addresses / port numbers and internal addresses / port numbers required for transmission / reception of multimedia data are set. It is assumed that it has been acquired and stored.

  When the user of the terminal A instructs the terminal A to call the terminal B, the terminal A transmits call information to the terminal B to the SIP server 5 as described above. The SIP server 5 that has received the call information transfers the call information to the target terminal B. The terminal B that has received the call information notifies the user that the call is being called by a screen display, a ringing tone, or the like (incoming call). Here, if the user of the terminal B instructs the terminal B to accept the incoming call in response to the call, the terminal B transmits the incoming call acceptance information to the terminal A through the same route as the call information.

  When the terminal A receives the incoming call acceptance information, the terminal A and the terminal B negotiate by exchanging SDP media information including information on the source address and port number without going through the SIP server 5 thereafter. Further, the terminals A and B perform the following address conversion.

  First, terminal A will be described.

  In the terminal A, the transmission source address acquisition unit 13 acquires the transmission source address / port number from the SDP media information received from the terminal B, that is, the external address / port number of the terminal B, and stores it in the counterpart device address storage unit 12. .

  Next, in the terminal A, the comparison unit 14 compares the external address of itself (terminal A) stored in the own device address storage unit 11 with the external address of terminal B stored in the counterpart device address storage unit 12. . In this case, the external address of terminal A is “210.xxx.xxx.001”, the external address of terminal B is also “210.xxx.xxx.001”, and both are the same.

  Therefore, in the terminal A, the address request unit 16 transmits the external address / port number of the terminal B stored in the counterpart device address storage unit 12 to the router 4 to correspond to the external address / port number. Request address and port number.

  The router 4 receiving the request searches the address / port number management table and returns the corresponding internal address / port number.

  In the terminal A, the address receiving unit 17 receives the internal address / port number corresponding to the external address / port number of the terminal B returned from the router 4, and stores the internal address / port number in the counterpart device address storage unit 12. Replace with the external address / port number of B and store.

  If there are a plurality of external addresses / port numbers of the terminal B stored in the counterpart device address storage means 12, the request, reception and storage are repeated until the internal addresses / port numbers are obtained for all of them.

  In the terminal A, the second setting means 18 changes the internal address / port number of the terminal B stored in the local apparatus address storage means 11 and the internal address / port number of the terminal B stored in place of the counterpart apparatus address storage means 12. The address and port number of itself and the terminal B when transmitting / receiving data are set.

  Similarly, terminal B performs the following address conversion.

  In the terminal B, the transmission source address acquisition unit 13 acquires the transmission source address / port number from the SDP media information received from the terminal A, that is, the external address / port number of the terminal A, and stores it in the counterpart device address storage unit 12. .

  Next, in the terminal B, the comparison unit 14 compares the external address of itself (terminal B) stored in the own device address storage unit 11 with the external address of the terminal A stored in the counterpart device address storage unit 12. . In this case, the external address of terminal B is “210.xxx.xxx.001”, and the external address of terminal A is also “210.xxx.xxx.001”, which are the same.

  Therefore, in the terminal B, the address request unit 16 transmits the external address / port number of the terminal A stored in the counterpart device address storage unit 12 to the router 4 to correspond to the external address / port number. Request address and port number.

  The router 4 receiving the request searches the address / port number management table and returns the corresponding internal address / port number.

  In the terminal B, the address receiving unit 17 receives the internal address / port number corresponding to the external address / port number of the terminal A returned from the router 4, and stores the internal address / port number in the counterpart device address storage unit 12. Replace with the external address and port number of A and store.

  If there are a plurality of external addresses / port numbers of the terminal A stored in the counterpart device address storage means 12, the request, reception and storage are repeated until the internal addresses / port numbers are obtained for all of them.

  In the terminal B, the second setting means 18 changes the internal address / port number of the terminal A stored in the local apparatus address storage means 11 and the internal address / port number of the terminal A stored in place of the counterpart apparatus address storage means 12. The address and the port number of the terminal A and the terminal A at the time of data transmission / reception are set.

  Thereafter, transmission / reception of actual multimedia data using the internal address / port number of terminal A and the internal address / port number of terminal B is started between terminal A and terminal B.

  Thereafter, when the user of terminal A or terminal B instructs the terminal to end, the communication end information is transmitted from terminal A or terminal B to the other terminal, and the other terminal receives the communication end information. Ends.

  FIG. 6 is a flowchart of processing corresponding to a program when the communication apparatus according to the embodiment is realized on a computer.

  The present invention installs a program for realizing the functions shown in the configuration diagram of FIG. 3 or a program having the procedure shown in the flowchart of FIG. 6 via a medium or a communication line in a known computer. Is also feasible.

  In the above-described embodiment, the case where the communication apparatus belongs to the internal network (closed communication network) and the communication connection apparatus is on the external network (wide area communication network) has been described. The present invention is applicable to all cases in which address conversion is involved in the connection of these devices, such as connection between networks. In the above-described embodiment, the port number is used together with the address. However, the port number is not essential and may be all addresses.

Configuration diagram showing an example of an address / port number management table The block diagram which shows an example of the communication system containing the communication apparatus of this invention Functional block diagram showing an example of an embodiment of a communication apparatus of the present invention Sequence diagram of communication operation in an embodiment of the present invention Sequence diagram of communication operation in an embodiment of the present invention The flowchart of the process corresponding to the communication program in the case of implement | achieving the communication apparatus concerning embodiment of this invention on a computer

Explanation of symbols

  1a, 1b, 1c: communication devices (terminals A, B, C), 2: internal network, 3: external network, 4: router, 5: SIP server, 11: own device address number storage means, 12: partner device address Storage means, 13: transmission source address acquisition means, 14: comparison means, 15: first setting means, 16: address request means, 17: address reception means, 18: second setting means.

Claims (3)

A communication apparatus that performs communication with a device outside the communication network to which the user belongs by using an address in the first network system and communication with a device in the communication network to which the terminal belongs by using an address in the second network system. The call information and the incoming call acceptance information are exchanged with the communication destination communication device through the communication connection device outside the communication network to which it belongs, and then the media information including the transmission source address is exchanged with the communication destination communication device. In a communication device that transmits and receives multimedia data under the conditions indicated in the matched media information,
Own device address storage means for storing the address in the first network system and the address in the second network system acquired prior to the exchange of the call information and the incoming call acceptance information;
Partner device address storage means for storing the address of the destination communication device;
A source address acquisition means for acquiring an address in the first network system of the communication destination communication apparatus from the transmission source address included in the received media information, and storing the address in the counterpart apparatus address storage means;
A comparing means for comparing the address in the first network system stored in the own apparatus address storage means with the address in the first network system of the communication destination communication apparatus stored in the counterpart apparatus address storage means;
As a result of the comparison, if the address in the first network system of the device is different from the address in the first network system of the communication destination communication device, the address of the first network system stored in the device address storage means is used. First setting means for setting the address in the first network system of the communication destination communication device stored in the address and the counterpart device address storage means to the address of the communication destination communication device itself and the data transmission / reception device; ,
As a result of the comparison, if the address in the first network system of the communication device and the address in the first network system of the communication destination communication device are the same, the communication destination communication device stored in the counterpart device address storage means Address request means for transmitting an address in the first network system and requesting an address in the second network system corresponding to the address;
An address in the second network system corresponding to the address in the first network system of the communication destination communication apparatus is received, and this is used as the address in the first network system stored in the counterpart apparatus address storage means. Address receiving means for replacement and storage;
The address in the second network system stored in the own apparatus address storage means and the address in the second network system of the communication destination communication apparatus stored in the counterpart apparatus address storage means are used for data transmission / reception. And a second setting means for setting the address of itself and the communication destination communication device. A communication method in which communication with a device outside the communication network to which the user belongs belongs using an address in the first network system, and communication with a device in the communication network to which the user belongs belongs using an address in the second network system. The call information and the incoming call acceptance information are exchanged with the communication destination communication device through the communication connection device outside the communication network to which it belongs, and then the media information including the transmission source address is exchanged with the communication destination communication device. In the communication method for transmitting and receiving multimedia data under the conditions indicated in the matched media information,
To the control unit,
A first step of acquiring an address in the first network system of the communication destination communication device from the transmission source address included in the received media information, and storing it in the counterpart device address storage means;
The address in the first network system acquired prior to the exchange of the call information and the incoming call acceptance information and stored in the own device address storage means and the first network of the communication destination communication device stored in the counterpart device address storage means A second step of comparing addresses in the system;
As a result of comparison, if the address in the first network system of the device is different from the address in the first network system of the communication destination communication device, the address is acquired prior to the exchange of the call information and the incoming call acceptance information, The address in the first network system stored in the storage unit and the address in the first network system of the communication destination communication device stored in the counterpart device address storage unit are stored in the first network system and the communication destination. A third step of setting the address of the communication device;
As a result of the comparison, if the address in the first network system of the communication device and the address in the first network system of the communication destination communication device are the same, the first communication destination communication device stored in the counterpart device address storage means A fourth step of sending an address in the second network scheme and requesting an address in the second network scheme corresponding to the address in the first network scheme;
Receives an address in the second network system corresponding to the address in the first network system of the communication destination communication device, and replaces it with the address in the first network system stored in the counterpart device address storage means And a fifth step of storing
The second network system of the communication destination communication device stored in the address of the other device and the address in the second device system stored in the own device address storage means, acquired prior to the exchange of the call information and the incoming call acceptance information And a sixth step of setting the address in the system to the address of itself and the addressee communication device at the time of data transmission / reception. A communication program for performing communication with a device outside the communication network to which the user belongs, using an address in the first network system, and performing communication with a device in the communication network to which the user belongs using the address in the second network system. The call information and the incoming call acceptance information are exchanged with the communication destination communication device through the communication connection device outside the communication network to which it belongs, and then the media information including the transmission source address is exchanged with the communication destination communication device. In a communication program for transmitting and receiving multimedia data under the conditions indicated in the matched media information,
On the computer,
A first step of acquiring an address in the first network system of the communication destination communication device from the transmission source address included in the received media information, and storing it in the counterpart device address storage means;
The address in the first network system acquired prior to the exchange of the call information and the incoming call acceptance information and stored in the own device address storage means, and the first network of the communication destination communication device stored in the counterpart device address storage means A second step of comparing addresses in the system;
As a result of comparison, if the address in the first network system of the device is different from the address in the first network system of the communication destination communication device, the address is acquired prior to the exchange of the call information and the incoming call acceptance information, The address in the first network system stored in the storage unit and the address in the first network system of the communication destination communication device stored in the counterpart device address storage unit are stored in the first network system and the communication destination. A third step of setting the address of the communication device;
As a result of the comparison, if the address in the first network system of the communication device and the address in the first network system of the communication destination communication device are the same, the first communication destination communication device stored in the counterpart device address storage means A fourth step of transmitting an address in the second network system and requesting an address in the second network system corresponding to the address in the first network system;
Receives an address in the second network system corresponding to the address in the first network system of the communication destination communication device, and replaces it with the address in the first network system stored in the counterpart device address storage means And a fifth step of storing
The second network system of the communication destination communication device stored in the address of the other device and the address in the second device system stored in the own device address storage means, acquired prior to the exchange of the call information and the incoming call acceptance information And a sixth step of setting the address in the system to the address of itself and the addressee communication device at the time of data transmission / reception.

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