JP2006121150A - Communication system, connection destination management apparatus, and connection destination searching method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily start new communication between users who are in communication. <P>SOLUTION: This connection destination management apparatus 2 stores the address information of terminals utilized by the users 3A, 3B and the session information of a session during communication between the users, a communication control apparatus 1Y inquires of the connection destination management apparatus 2 about a called party address of the called side user 3B making communication with the caller side user 3A in response to a connection request from a caller terminal 3YA, the connection destination management apparatus 2 references address information and session information to search the called party address of the called terminal utilized by the called side user 3B making communication with the caller side user 3A in response to the inquiry from the communication control apparatus 1Y, and the communication control apparatus 1Y establishes a new session between the called side user 3B and the caller side user 3A on the basis of the called party address. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a communication technique, and more particularly to a communication control technique for establishing a new session using session information relating to a session established between users.

  In recent years, with the spread of the Internet, the types of media exchanged between users via various communication networks have also diversified. For example, in the past, there was only a voice call by a telephone terminal as a medium for communicating in real time between users, but now real-time communication is realized by exchanging character information between users in real time via a communication network. A service or chat is also provided. In such a service, for example, an application called IM (Instant Message) that exchanges messages in real time between user terminals connected via the Internet is used (see Non-Patent Document 1, etc.).

When the media is diversified as described above, when communication is performed between users with an arbitrary medium, a request for starting communication with another medium between the same users is generated. For example, when a user is chatting using a personal computer, a request for starting a voice call is generated to convey the intention in more detail to the same party.
Conventionally, in such a case, one of the users is told the other party's telephone number, and the telephone number is transmitted using a telephone terminal to establish a voice call through the telephone network.

The applicant has not yet found prior art documents related to the present invention by the time of filing other than the prior art documents specified by the prior art document information described in this specification.
"MSN Messenger", http://messenger.msn.co.jp/, Microsoft, 2004

However, in such a conventional technology, for example, when a new voice call is started with the same partner in communication, it is necessary to check the other party's phone number using the currently used media. However, there is a problem that it is not possible to easily start a new communication between the same users even though they are already communicating.
The present invention is for solving such a problem, and provides a communication system, a connection destination management apparatus, and a connection destination search method capable of easily starting a new communication between communicating users. It is an object.

  In order to achieve such an object, a communication system according to the present invention is connected to a terminal used by each user via a communication network, and in response to a connection request from an arbitrary originating terminal, A communication control device having a communication control unit that establishes a session used for communication between the originating terminal and the desired destination terminal via the terminal, the address information of the terminal used by the user, and a session relating to the session in communication between the users A destination management apparatus having a storage unit for storing information, and a communication control unit configured to communicate with the calling terminal in response to a connection request from a calling terminal of an arbitrary calling user. Queries the destination management device for the destination address, establishes a new session between the originating terminal and the destination terminal based on the obtained destination address, and sends the inquiry to the connection destination management device from the communication control device. Meet Communication information is searched by referring to the address information and session information of the storage unit, and searching for the called side address of the called side terminal that communicates with the calling side terminal among the terminals used by the called side user communicating with the calling side user. A connection destination search unit for responding to the apparatus is further provided.

  At this time, the connection destination search process is used in the storage unit in the session that is communicating between the user and the user management table that stores the address of the terminal used by each user for each media type handled by the terminal. A session management table that stores the address of the terminal is stored, the connection destination search unit searches the session management table for the address of the terminal used by the called user who is communicating with the calling user, and the obtained address From the user management table, and the destination address of the destination terminal that handles the desired media type among the terminals used by the destination user is retrieved from the user management table. The called address may be returned to the communication control device.

  As for registration / deletion of session information, when a session between arbitrary terminals is established in the communication control unit, the session management server instructs the connection destination management apparatus to register session information related to the session, and the session It may be possible to instruct the connection destination management apparatus to delete the session information related to the connection destination.

  Further, the connection destination management apparatus according to the present invention is connected to a terminal used by each user via a communication network, and in response to a connection request from an arbitrary originating terminal, A connection destination management apparatus used in a communication system having a communication control apparatus that establishes a session used for communication with a desired called terminal, and a session in communication between the address information of the terminal used by the user and the user In response to an inquiry from a communication control device in response to a connection request from an originating terminal of an arbitrary originating user, the address information and session information in the storage unit are referred to and A connection destination search unit that searches for a destination address of a destination terminal that communicates with a source terminal among terminals used by a destination user who is communicating with the side user and returns a response to the communication control device A.

  At this time, the connection destination search process is used in the storage unit in the session that is communicating between the user and the user management table that stores the address of the terminal used by each user for each media type handled by the terminal. A session management table that stores the address of the terminal is stored, the connection destination search unit searches the session management table for the address of the terminal used by the called user who is communicating with the calling user, and the obtained address From the user management table, and the destination address of the destination terminal that handles the desired media type among the terminals used by the destination user is retrieved from the user management table. The called address may be returned to the communication control device.

  The connection destination search method according to the present invention is connected to a terminal used by each user via a communication network, and in response to a connection request from an arbitrary calling terminal, A connection destination search method performed by a connection destination management device used in a communication system having a communication control device that establishes a session used for communication with a desired destination terminal, the address information of the terminal used by the user and the user A storage step for storing session information relating to a session in communication between the storage unit and an address of the storage unit in response to an inquiry from a communication control device in response to a connection request from a calling terminal of an arbitrary calling user Referring to the information and session information, the destination address of the destination terminal that communicates with the originating terminal among the terminals used by the terminating user who is communicating with the originating user is searched for to the communication control device It is intended and a destination search step of answers.

  At this time, the connection destination search process is used in a storage step, a user management table for storing the address of a terminal used by each user for each media type handled by the terminal, and a session in communication between the users. A session management table that stores the address of the terminal is stored, and in the connection destination search step, the address of the terminal used by the called user who is communicating with the calling user is searched from the session management table, and the obtained address From the user management table, and the destination address of the destination terminal that handles the desired media type among the terminals used by the destination user is retrieved from the user management table. The called address may be returned to the communication control device.

According to the present invention, in response to a connection request from an originating terminal of an arbitrary originating user, the communication control apparatus inquires the connection destination management apparatus for the address of the terminating terminal that communicates with the originating terminal. A new session is established between the calling terminal and the called terminal based on the received called address. At that time, the connection destination management device refers to the address information and session information in response to an inquiry from the communication control device, and communicates with the calling terminal among the terminals used by the called user who is communicating with the calling user. Since the called side address of the called side terminal performing the search is retrieved and returned to the communication control apparatus, session information during communication between users can be used for establishing a new session.
Therefore, when a communicating user establishes a new session, there is no need to check information necessary for establishing the new session, for example, the address of the partner terminal between the users. New communication can be easily started.

Next, embodiments of the present invention will be described with reference to the drawings.
[Communications system]
First, a communication system according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing a configuration of a communication system according to an embodiment of the present invention.
In this communication system, a communication control device 1 (1X, 1Y) and a connection destination management device 2 are provided. The communication control device 1 is connected to the connection destination management device 2 and also used by each user 3 (3A, 3B) via the communication network 4 to communicate with a communication terminal 3X (3XA, 3XB) and a communication terminal 3Y (3YA, 3YB). ).

  In the present embodiment, session information related to a session established between communication terminals is stored by the connection destination management device 2 and obtained by referring to the session information of the connection destination management device 2 by the communication control device 1. A new communication session is established between communicating users based on the called party address.

Here, the communication system according to the present embodiment includes two communication control devices 1X and 1Y that handle different media, and one connection destination management device 2 that is provided in common to these communication control devices 1X and 1Y. An example will be described.
In addition, the communication system according to the present embodiment is used by two users 3A and 3B, and the communication terminals 3XA and 3XB for the media X handled by the users 3A and 3B in the communication control device 1X and the communication control device 1Y. The communication terminals 3YA and 3YB for the media Y to be handled are used.

[Communication control device]
The communication control device 1 (1X, 1Y) is a communication device having an arithmetic processing unit (not shown) that performs various arithmetic processes by a computer as a whole, and a predetermined program is executed by a microprocessor such as a CPU that constitutes the arithmetic processing unit. By executing the above, various functional means are realized. The main functional means includes a communication control unit 11 (11X, 11Y) and a communication management unit 12 (12X, 12Y).

The communication control unit 11 establishes a session used for communication between a calling terminal and a desired called terminal via the communication network 4 in response to a connection request from an arbitrary calling terminal, and an arbitrary calling terminal. In response to a connection request from the side terminal, the terminal has a function of inquiring the destination management device about the destination address of the destination terminal that communicates with the originating terminal.
The communication management unit 12 has a function of registering session information related to the session established by the communication control unit 11 in the connection destination management apparatus 2.

[Destination management device]
The connection destination management device 2 is a communication device having an arithmetic processing unit (not shown) that performs various arithmetic processes by a computer as a whole, and executes a predetermined program by a microprocessor such as a CPU constituting the arithmetic processing unit. By implementing various functional means. As a main functional means, a connection destination search unit 24 is provided. In addition, the connection destination management device 2 includes a hard disk and a memory, and includes a storage unit 21 that stores address information of a communication terminal used by the user 3 and session information regarding a session in communication between the users. Among these, address information is managed by the user management table 22, and session information is managed by the session management table 23.

  The connection destination search unit 24 refers to the address information and session information stored in the storage unit 21 in response to an inquiry from the communication control device 1, and is a terminal used by the destination user who is communicating with the originating user 1 has a function of searching for a destination address of a destination terminal that communicates with the originating terminal and returning the obtained destination address to the communication control device 1.

[User Management Table]
Next, the user management table 22 of the connection destination management apparatus 2 will be described with reference to FIG. FIG. 2 is a configuration example of the user management table.
The user management table 22 stores a user name for each ID, which is identification information unique to each user 3, and stores an address of a terminal used by the user for each media type. For example, for the user with ID “c32548”, “Tokuno 聡” is stored as the user name, the phone terminal address “050-1234-AAAA”, and the IM terminal address “tokuno@im.ntt.com” "Is memorized.

[Session management table]
Next, the session management table 23 of the connection destination management apparatus 2 will be described with reference to FIG. FIG. 3 is a configuration example of the session management table.
This session management table 23 performs communication using session start time, session expiration date, media type handled in the session, and session as session information indicating the detailed contents of the session for each session in communication between users. The address of the calling terminal and the address of the called terminal are stored.

For example, for a currently established session, the session start time “2004-07-19 14:59”, session expiration date “2004-07-19 23:30”, media type “IM”, and originating terminal address “Tokuno@im.ntt.com” and the address of the calling terminal “kawaguti@im.ntt.com” are stored.
The session information may not include extra personal information and may be encrypted to prevent eavesdropping from a third party.

[Operation of communication system]
Next, operations of the communication system according to the present embodiment will be described with reference to FIGS. 4 and 5. FIG. 4 is a sequence diagram showing a connection control operation of the communication system according to the present embodiment. FIG. 5 is a sequence diagram showing a connection destination search operation of the communication system according to the present embodiment. Here, as an example, the user 3A and the user 3B start communication using the medium X and then start new communication using the medium Y using the session information of the communication between the same users. explain.

First, since the user 3A who is a calling side user communicates with the user 3Y who becomes a called side user using the medium X, the communication terminal 3XA which becomes the calling side terminal by operating the communication terminal 3XA which becomes the calling side terminal. Instructs connection to 3XB.
In response to an instruction from the user 3A, the communication terminal 3XA transmits a connection request including the destination address XB of the destination terminal 3XB to the communication control device 1X that handles the media X (step 100).

The communication control unit 11X of the communication control device 1X receives a connection request from the communication terminal 3XA via the communication network 4, refers to the destination address included in the connection request, and communicates with the communication terminal 3XA and the communication terminal 3XB. A connection request for establishing a session with the communication terminal 3XB is transmitted to the communication terminal 3XB corresponding to the destination address (step 101). Then, in response to the response from the communication terminal 3XB (step 102), the response is returned to the communication terminal 3XA (step 103).
Thereby, a session is established between the communication terminal 3XA and the communication terminal 3XB via the communication network 4 (step 104), and communication by the media X is started between both terminals.

Thereafter, the communication management unit 12X of the communication control device 1X acquires session information regarding the session between the communication terminal 3XA and the communication terminal 3XB from the communication control unit 11X, and sends a registration instruction including the session information to the connection destination management device 2 (Step 105).
In response to the registration instruction from the communication control device 1X, the storage unit 21 of the connection destination management apparatus 2 registers the session information included in the registration instruction in the session management table 23 (step 106).
Thereafter, when the session ends (step 107), the communication management unit 12X of the communication control device 1X transmits an instruction to delete session information to the connection destination management device 2 (step 108). In response to the deletion instruction from the communication control device 1X, the storage unit 21 of the connection destination management apparatus 2 deletes the session information specified by the deletion instruction from the session management table 23 (step 109).

  As a result, as shown in FIG. 3, the session management table 23 includes, as session information of the session, a source address included in the connection request as a transmission source of the connection request or a unique communication path (for example, a subscriber line). The address of the communication terminal 3XA specified on the basis of) is registered as the originating address, and the address of the communication terminal 3YA is registered as the called address. Further, the media X handled by the communication control device 1X is registered as the media type, and the session start time and the expiration date are registered respectively.

In this way, communication using the media X using the communication terminals 3XA and 3XB is started between the users 3A and 3B. Thereafter, when the user 3A starts a new communication using a medium Y different from that of the currently communicating user 3B, the user 3A operates the communication terminal 3YA for the medium Y to instruct connection to the currently communicating user 3B. To do.
In response to an instruction from the user 3A, the communication terminal 3YA transmits an in-communication connection request indicating a connection request to the communicating partner user to the communication control apparatus 1Y that handles the media Y (step 110). At this time, it is not necessary to specify the called side address from the user 3A, and the called side address is not included in the connection request during communication. In addition, the communication connection request includes, for example, a calling party ID as information indicating the calling user or the calling terminal.

  As for the connection destination of the connection request during communication, a representative connection destination that can be shared by all users may be set in advance for each of the communication control devices 1X and 1Y. Thereby, in the communication control apparatuses 1X and 1Y, when the connection request from the communication terminals 3XA, 3XB, 3YA, and 3YB is for the representative connection destination, the connection request is already made using another medium. It is possible to easily confirm that the request is a connection request during communication with respect to the transmitted communication. In addition, when each user 3A, 3B requests a connection during communication, it is only necessary to specify a representative connection destination regardless of the other party currently communicating, and the work load for requesting the connection during communication is reduced and easy. You can use a busy connection.

Since the communication control unit 11Y of the communication control device 1Y receives the connection request during communication from the communication terminal 3YA via the communication network 4, and the destination address is not included in the connection request during communication, the connection destination management device The following called address acquisition processing (steps 120 to 126) is started between the two.
First, the communication control unit 11Y of the communication control device 1Y uses the calling party ID included in the in-communication connection request as the transmission source of the in-communication connection request to determine the called-side user currently in communication with the user 3A. An inquiry of the destination ID shown is transmitted to the connection destination management device 2 (step 120).

  The connection destination search unit 24 of the connection destination management apparatus 2 refers to the session management table 23 in response to the user inquiry from the communication control apparatus 1Y, and the calling user having the calling party ID included in the user inquiry is The session currently used for communication is searched (step 121). At this time, the address of each communication terminal used by the calling user is acquired from the user management table 22 and a session having these addresses as the calling or called address is searched from the session management table 23.

  Next, the connection destination search unit 24 acquires the partner terminal address from the searched session information, and refers to the user management table 22 to search for a user who uses the communication terminal of the partner terminal address (step 122). . Then, the user ID of the searched user is returned to the communication control device 1Y as the called party ID (step 123).

  The communication control unit 11Y of the communication control device 1Y receives the user notification from the connection destination management device 2, and receives the called party ID included in the user notification and the media type indicating the media Y handled by the communication control device 1Y. In the communication terminal used by the called-side user having the called-side ID, an inquiry about the address of the communication terminal that handles the media Y is transmitted to the connection destination management apparatus 2 (step 124).

  The connection destination search unit 24 of the connection destination management apparatus 2 refers to the user management table 22 in response to an address inquiry from the communication control apparatus 1Y, and the called side user having the called side ID included in the address inquiry Among the communication terminals to be used, the address of the communication terminal that handles the media type included in the address inquiry is searched (step 125). Then, the retrieved address is returned to the communication control device 1Y as the called address (step 126).

The communication control unit 11Y of the communication control device 1Y receives the address notification from the connection destination management device 2, and the called side address included in the address notification and the calling side included in the connection request from the communication terminal 3YA. Using the address, a connection request for establishing a session between the communication terminal 3YA and the communication terminal 3YB is transmitted to the communication terminal 3YB corresponding to the destination address (step 111). Then, in response to the response from the communication terminal 3YB (step 112), the response is returned to the communication terminal 3YA (step 113).
As a result, a new session is established between the communication terminal 3YA and the communication terminal 3YB via the communication network 4 (step 114), and communication using the media Y is started between both terminals.

  As described above, in the present embodiment, the connection destination management device stores the address information of the terminal used by the user and the session information related to the session being communicated between the users, and the communication control device causes the calling terminal to In response to a connection request from the destination terminal, an inquiry is made to the destination management device about the destination address of the destination terminal that communicates with the originating terminal, and the connection destination management device uses the address information and session in response to the inquiry from the communication control device. Refers to the information, searches for the destination address of the destination terminal that communicates with the originating terminal among the terminals used by the terminating user who is communicating with the originating user, and notifies the connection destination management device by the communication control device Since a new session is established between the caller terminal and the callee terminal based on the received callee address, the session information during communication between the users is set as a new session. It can be used to establish ® down.

  Therefore, when a communicating user establishes a new session, there is an operation of confirming information necessary for establishing the new session, for example, the address of the counterpart terminal between the users, and further operating and inputting the address. It becomes unnecessary, and new communication can be easily started between communicating users.

  Thus, for example, if you want to make a voice call over the phone with the chat partner while using IM chat, you can automatically make a voice call over the phone with the chat partner by simply calling the chat communication device instead of the chat partner. Can start. Therefore, it is possible to have a conversation with the communication partner over the telephone simply by making a call to the telephone number of the same telephone communication control device without being aware of the communication partner's telephone number.

  Also, when a user performs web shopping using the Internet, for example, if he / she wants to confirm detailed information regarding products, payments, delivery, etc. by telephone, the user can automatically make a web shopping by simply sending the telephone communication control device. You can start a voice call with the person in charge. Therefore, it is possible to have a conversation with a communication partner by telephone only by always calling the telephone number of the same telephone communication control device without being aware of the telephone number of the person in charge of Web shopping.

  In addition, when a session between any terminals is established by the communication control unit 11 of the communication control device 1, the connection destination management device 2 is instructed to register session information related to the session, and the session related information is related to the session when the session ends. Since the connection destination management apparatus 2 is instructed to delete the session information, the session management table 23 of the connection destination management apparatus 2 is automatically updated according to the establishment / termination of the session.

[Extended embodiment]
In the above, a case where the communication control devices 1X and 1Y corresponding to each medium are arranged in the same communication network 4 on the assumption of an IP telephone using a packet network has been described as an example, but the present invention is not limited to this. . For example, the communication control devices 1 are distributed and arranged in individual communication networks using a communication protocol corresponding to each medium, and each communication control device 1 individually acquires session information and registers it in the connection destination management device 2. It may be.

  Moreover, although the case where the individual communication control devices 1 are distributed and arranged in the communication network 4 for each medium has been described as an example, the present invention is not limited to this, and a single communication control device 1 handles a plurality of media. May be. At this time, as a method of identifying the medium requested by the communication connection request, the desired medium may be identified by the transmission destination address of the communication connection request, and the medium corresponding to the transmission source address of the communication connection request The type may be inquired from the communication control device 1 to the connection destination management device 2.

In addition, the destination address acquisition process (steps 120 to 126) in FIG. 5 is not limited to the above description, and the process procedure, information used for the process, and the like can be arbitrarily changed.
As for the processing procedure, for example, the user inquiry and the address inquiry are combined into one address inquiry, and in response to the address inquiry from the communication control device 1, steps 121, 122, and 125 are continuously processed in the connection destination management device 2. The obtained called address may be returned to the communication control device 1 by address notification. Thereby, user notification (step 123) and address inquiry (step 124) can be omitted.

  For information used for processing, for example, when the communication control apparatus 1 cannot determine the calling party ID used for the user inquiry (step 120), the address of the calling terminal that is the transmission source of the connection request during communication is used. The user inquiry may be made. For example, when a new session is established using a public telephone network, no means for notifying the calling party ID via an analog telephone line is provided. In such a case, the address of the originating terminal is specified based on the originating address included in the connection request or a unique communication path (for example, a subscriber line) as the source of the connection request, and the originating address is used. A user inquiry may be made. In the connection destination search unit 24 of the connection destination management apparatus 2, it is possible to specify the user corresponding to the calling party address from the user management table 22.

  In the present invention, the term “address” is used as the term indicating the connection destination information for specifying the communication terminal. However, the “address” is not limited to the IP address or URL used on the Internet. Connection destination information other than these, for example, connection destination information used in other communication networks and protocols, such as a telephone number used in a public telephone network or a mobile phone network, is also included.

It is a block diagram which shows the structure of the communication system concerning one embodiment of this invention. It is a structural example of a user management table. It is a structural example of a session management table. It is a sequence diagram which shows the connection control operation | movement of the communication system concerning this Embodiment. It is a sequence diagram which shows the connection destination search operation | movement of the communication system concerning this Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1X, 1Y ... Communication control apparatus, 11X, 11Y ... Communication control part, 12X, 12Y ... Communication management part, 2 ... Connection destination management apparatus, 21 ... Memory | storage part, 22 ... User management table, 23 ... Session management table, 24 ... Connection destination search unit, 3, 3A, 3B ... User, 3XA, 3YA, 3XB, 3YB ... Communication terminal.

Claims (7)

Communication between a terminal used by each user via a communication network and communication between the calling terminal and a desired destination terminal via the communication network in response to a connection request from an arbitrary calling terminal A communication control device having a communication control unit for establishing a session used for
A connection destination management device having a storage unit for storing address information of a terminal used by the user and session information regarding a session in communication between the users;
In response to a connection request from an originating terminal of an arbitrary originating user, the communication control unit inquires the terminating address of the terminating terminal that communicates with the originating terminal to the connection destination management apparatus, Establishing a new session between the calling terminal and the called terminal based on the side address;
The connection destination management device refers to the address information and session information in the storage unit in response to an inquiry from the communication control device, and the calling destination user uses the calling party user who is communicating with the calling user. A communication system further comprising: a connection destination search unit that searches for a destination address of a destination terminal that communicates with the side terminal and returns the address to the communication control device. The communication system according to claim 1,
The storage unit stores a user management table for storing a terminal address used by each user for each media type handled by the terminal, and a session management table for storing a terminal address used in a session during communication between the users. And remember
The connection destination search unit searches the session management table for the address of the terminal used by the called user who is communicating with the calling user, and selects the called user who uses the terminal of the obtained address as the user. A search is made from the management table, a callee address of a callee terminal that handles a desired media type among the terminals used by the callee user is searched from the user management table, and the obtained callee address is sent to the communication control device. A communication system characterized by responding. The communication system according to claim 1,
When the communication control unit establishes a session between any terminals, the communication control unit instructs the connection destination management apparatus to register session information related to the session, and deletes the session information related to the session when the session ends. A communication system characterized by instructing a destination management apparatus. Communication between a terminal used by each user via a communication network and communication between the calling terminal and a desired destination terminal via the communication network in response to a connection request from an arbitrary calling terminal A connection destination management device used in a communication system having a communication control device for establishing a session used for
A storage unit for storing address information of a terminal used by the user and session information regarding a session in communication between the users;
In response to an inquiry from the communication control device in response to a connection request from an originating terminal of an arbitrary originating user, the addressing side and session information of the storage unit are referred to and the terminating side in communication with the originating user A connection destination management apparatus comprising: a connection destination search unit that searches for a destination address of a destination terminal that communicates with the calling terminal out of terminals used by a user, and returns a response to the communication control apparatus. In the connection destination management apparatus according to claim 4,
The storage unit stores a user management table for storing a terminal address used by each user for each media type handled by the terminal, and a session management table for storing a terminal address used in a session during communication between the users. And remember
The connection destination search unit searches the session management table for the address of the terminal used by the called user who is communicating with the calling user, and selects the called user who uses the terminal of the obtained address as the user. A search is made from the management table, a callee address of a callee terminal that handles a desired media type among the terminals used by the callee user is searched from the user management table, and the obtained callee address is sent to the communication control device. A connection destination management device characterized by responding. Communication between a terminal used by each user via a communication network and communication between the calling terminal and a desired destination terminal via the communication network in response to a connection request from an arbitrary calling terminal A connection destination search method performed by a connection destination management device used in a communication system having a communication control device that establishes a session used for
A storage step of storing, in a storage unit, address information of a terminal used by the user and session information regarding a session in communication between the users;
In response to an inquiry from the communication control device in response to a connection request from an originating terminal of an arbitrary originating user, the addressing side and session information of the storage unit are referred to and the terminating side in communication with the originating user A connection destination search method comprising: a connection destination search step of searching for a destination address of a destination terminal that communicates with the originating terminal among terminals used by a user and returning the address to the communication control device. In the connection destination search method according to claim 6,
The storage step includes a user management table that stores an address of a terminal used by each user for each media type handled by the terminal, and a session management table that stores an address of a terminal used in a session during communication between the users. And remember
The connection destination search step searches the session management table for the address of the terminal used by the called user who is communicating with the calling user, and selects the called user who uses the terminal at the obtained address. A search is made from the management table, a callee address of a callee terminal that handles a desired media type among the terminals used by the callee user is searched from the user management table, and the obtained callee address is sent to the communication control device. A connection destination search method characterized by responding.

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