JP2004248165A - Session and media relay method, transfer method, and its program and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To smoothly transfer a communication session without affecting a communication application used by a user and without break of communication media. <P>SOLUTION: The communication application of a transfer origin terminal 21 which is about to perform transfer and the communication application of a transfer destination terminal 22 communicating with the communication application of the transfer origin terminal 21 communicate via a session and media relay server 24 which relays the communication session and the media. In this case, when the communication session is transferred from the transfer origin terminal 21 to a transfer destination terminal 23 in the case of transferring the communication session of the communication application of the transfer origin terminal 21 to the communication application of the transfer terminal 23 separate from the transfer origin terminal 21 and the transfer destination terminal 22, information about the communication session is converted by the session and media relay server as if communication is performed with the communication application of the transfer origin terminal from a communication application of a communication destination terminal. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a session and media relay method, a transfer method, and a program capable of seamlessly switching a communication session and seamlessly switching a communication medium.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a technology for transferring communication, there has been a transfer telephone using an exchange or a telephone terminal. This is because, by inputting the address information (for example, telephone number) of the transfer destination from the receiving terminal, the communication can be transferred without disconnecting or reconnecting, while continuing the communication.
Similarly, as a method of transferring a multimedia session such as a video telephone, there are ITU 450.2 (Call Transfer Supplementary Services for H.323) (see Non-Patent Document 1, hereinafter referred to as A method), IETF draft. (SIP Call Control Transfer) (see Non-Patent Document 2, hereinafter referred to as B method). In these methods, similarly to the above, by inputting the address information of the transfer destination (e.164 telephone number, URL, IP address, etc.) from the receiving terminal, the communication is continued without disconnection or reconnection. Communication could be transferred. For example, during setting of a multimedia session including data, images, and audio, a session of one of the media may be dissatisfied, and the session may be transferred to another terminal that is satisfied.
[0003]
In addition, it is mounted on the transfer source terminal as in “Session transfer method” (hereinafter referred to as C method) described in Japanese Patent Application No. 2002-107889 and the drawings proposed by the present applicant prior to the present application. A method for transferring a communication session to a communication application mounted on a destination terminal different from the transfer source terminal when a communication application and a communication application mounted on the communication destination terminal are communicating via a network. There is. As a result, the application communicating with the transfer source terminal is searched, and the communication application installed in the transfer destination terminal is obtained.
[0004]
Based on the result, the user selects the communication application of the transfer destination terminal or automatically determines the communication application, and then, together with the start instruction to the communication application of the transfer destination terminal, necessary for transferring the session. Send session information. The transfer destination terminal starts the communication application for which the start instruction has been issued, and returns a notification that the start has been completed to the transfer source terminal. Thereafter, a transfer instruction is issued to the communication destination terminal, and communication connection is performed from the communication application of the communication destination terminal to the communication application of the transfer destination terminal activated earlier. When the connection is completed, the transfer source terminal is notified that the transfer is completed, and the communication between the communication application of the transfer source terminal and the communication application of the communication destination terminal is disconnected.
[0005]
[Non-patent document 1]
"Call transfer supplementary service for H.323," Recommendation H.323. 450.2, International Telecommunication Union-Telecommunication sector, Internet <URL: http: // www. itu. int / rec / recommendation. asp? type = items & lang = e & parent = −REC-H. 450.2-199802-I>
[Non-patent document 2]
R. Sparks (Dynamicsoft) "SIP Call Control-Transfer draft-ietf-sip-cc-transfer-05" Internet Engineering Task Force (IETF), Internet <URL: /www./www. ief. org / internet-drafts / draft-iet-sip-cc-transfer-05. txt>
[0006]
[Problems to be solved by the invention]
However, the conventional methods such as the A, B, and C methods have the following problems.
(1) The first problem is that the communication application of the communication destination terminal receives the transfer instruction from the transfer source terminal, and simultaneously executes the processing of the communication session of both the communication application of the transfer source terminal and the communication application of the transfer destination terminal. That is something that must be done.
{Circle around (2)} The second problem is that it is necessary for the communication destination terminal to simultaneously perform the communication media processing (audio / video transmission / reception processing, etc.) of the transfer source terminal and the transfer destination terminal after the communication is established. .
[0007]
The communication application installed in the conventional communication destination terminal does not include the processes which are the first and second problems.
In addition, when the above-described A, B, and C methods are employed, there is an effect on communication destination terminals that are not directly related to communication session switching, and therefore, the possibility that the above-described processing is implemented in those communication destination terminals is low.
[0008]
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems, to enable a communication session to be moved without affecting a communication application used by a user, and to smoothly perform a communication session without interruption of communication media. It is an object of the present invention to provide a session and a media relay method, a transfer method, and a program thereof, which can be moved.
[0009]
[Means for Solving the Problems]
According to the session and media relay method of the present invention, (1) a communication application of a transfer source terminal that is to perform a transfer and a communication application of a communication destination terminal that is communicating with the communication application of the transfer source terminal are connected to a communication session. Communication is performed via a session and media relay server that relays media, and the communication session of the communication application of the source terminal is transferred to a communication application of a destination terminal that is a terminal different from the source terminal and the destination terminal. , A session and media relay method that enables seamless continuation of communication, wherein even when a communication session moves from the source terminal to the destination terminal, it is as if the source terminal communication application As if communicating with another communication application. In down-and media relay server, it is characterized by converting the information of the communication session.
This eliminates the need for the communication application of the communication destination terminal to be an application that is aware that the communication session has moved from the transfer source terminal to the transfer destination terminal, and does not affect the normal communication application used by the user. This has the effect.
[0010]
Also, (2) the communication application of the transfer source terminal that intends to perform the transfer and the communication application of the communication destination terminal that is communicating with the communication application of the transfer source terminal are session and media relaying the communication session and the media. The communication is performed via the relay server, and the communication session of the communication application of the transfer source terminal is transferred to the communication application of the transfer destination terminal which is different from the transfer source terminal and the communication destination terminal, so that the communication can be seamlessly continued. A session and media relay method that enables a communication session from a communication application of a source terminal to a communication application of a destination terminal, wherein the communication media from the communication application of the destination terminal is transmitted to the session and media relay server. Copy and transfer It is characterized by temporarily relayed to both the communication application in the communication destination terminal and end of the communication application.
As a result, there is an effect that a user who intends to perform the transfer looks as if the communication session has moved smoothly without interruption of the communication medium.
[0011]
(3) The communication application of the transfer source terminal that intends to perform the transfer and the communication application of the communication destination terminal that is communicating with the communication application of the transfer source terminal are a session and media that relays a communication session and a medium. The communication session of the communication application of the transfer source terminal is transferred to the communication application of the transfer destination terminal, which is another terminal different from the transfer source terminal and the communication destination terminal, communicating via the relay server, and the communication is seamlessly continued. And transferring the communication session from the communication application of the source terminal to the communication application of the destination terminal, wherein the communication session is transferred from the communication application of the source terminal or the destination terminal to the communication terminal of the destination terminal. Communication media to other communication applications It is characterized by discarding in only one of the session and media relay servers.
Thereby, since only one side of the communication medium flows to the communication destination terminal, there is obtained an effect that the medium is not disturbed and confusion does not occur for the user using the communication destination terminal.
[0012]
(4) The communication application of the transfer source terminal that is about to perform the transfer and the communication application of the communication destination terminal that is communicating with the communication application of the transfer source terminal are a session and media relaying the communication session and the media. The communication session of the communication application of the transfer source terminal is transferred to the communication application of the transfer destination terminal, which is another terminal different from the transfer source terminal and the communication destination terminal, communicating via the relay server, and the communication is seamlessly continued. And transferring the communication session from the communication application of the source terminal to the communication application of the destination terminal, wherein the communication session is transferred from the communication application of the source terminal and the destination terminal to the communication terminal of the destination terminal. Communication media to both communication applications It is characterized by discarding in the session and media relay server.
Thereby, unlike the above (3), since the communication medium flows from both sides to the communication destination terminal, there is obtained an effect that transmission omission of the communication medium from the transfer source terminal and the transfer destination terminal is eliminated.
[0013]
Further, (5) the communication application of the transfer source terminal that intends to perform the transfer and the communication application of the communication destination terminal that is communicating with the communication application of the transfer source terminal perform session and media relaying a communication session and a medium. The communication session of the communication application of the transfer source terminal is transferred to the communication application of the transfer destination terminal, which is another terminal different from the transfer source terminal and the communication destination terminal, communicating via the relay server, and the communication is seamlessly continued. And a media transfer method that enables a continuous communication session from the source terminal to the first destination terminal, from the first destination terminal to another destination terminal, and so on. It is characterized in that it can be moved.
This provides an effect that the user can switch to the terminal to which he / she wants to transfer the communication session in accordance with the situation of the place.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(System configuration)
As shown in FIG. 1, in the session and media relay system of the present invention, a transfer source terminal 21, a communication destination terminal 22, a transfer destination terminal 23, and a session and media relay server 24 are connected to respective networks (networks 11, 12, and 13). , 14). However, these networks 11 to 14 may be connected to each other as shown in FIG. Also, all terminals 21 to 23 and server 24 may be arranged on one network. Further, the transfer source terminal 21, the communication destination terminal 22, and the transfer destination terminal 23 may be any of communication devices such as a PC (Personal Computer), a PDA (Personal Digital Assistance), a mobile phone terminal, and a Workstation.
[0015]
FIG. 2 is a configuration diagram of the session and media relay server, the transfer source terminal (the transfer destination terminal), and the communication destination terminal in FIG.
As shown in FIG. 2, in the session and media relay server 24, a terminal identifier information management database 241 and a communication session identifier management database 242 are connected to a communication session transmission / reception processing unit 243, respectively. The communication media transmission / reception processing unit 244 is connected to 243.
The transfer source terminal 21 (the transfer destination terminal 23 has the same configuration) and the communication destination terminal 22 have communication applications 213 and 221, and the communication applications 213 and 221 have communication sessions with the UI function units 2131 and 2121. The transmission / reception processing units (including the transfer processing unit) 2132 and 2212 and the communication media transmission / reception processing units 2133 and 2213 are included.
[0016]
The application control function 211 of the transfer source terminal (transfer destination terminal) 21 starts the communication application 213 when another terminal requests the start of the communication application 213 through the transfer control function 212. Further, in response to the termination of a certain communication application 213 from the transfer control function 212, the communication application 213 is terminated.
The transfer control function 212 communicates with the communication session transmission / reception processing unit 243 of the session and media relay server 24, and transmits an APL activation request to another terminal.
The communication application 213 is an application such as a videophone, and the application control function 211 activates or terminates the communication application 213.
[0017]
The UI function unit 2131 of the communication application 213 is a function unit that serves as an interface for the user. The communication session transmission / reception processing unit 2132 connects or disconnects the communication session of the communication application 213 to the communication session transmission / reception processing unit 243 of the session and media relay server 24, transfers the session information, notifies the session connection completion, or identifies the terminal identifier. Request for registration or deletion of In addition, the communication session transmission / reception processing unit 243 prepares the communication media transmission / reception processing unit 2133 connected to the communication session transmission / reception processing unit 2133, and monitors the flow of media in the media transmission / reception processing. The communication media transmission / reception processing unit 2133 is controlled by the communication session transmission / reception processing unit 2132, and transmits / receives media to / from the communication media transmission / reception processing unit 244 of the session and media relay server 24.
[0018]
The terminal identifier information database 241 arranged in the session and media relay server 24 holds a terminal identifier allocated to each terminal, and an address and a port number used by a communication application corresponding to the terminal identifier. On the other hand, the communication session identifier management database 242 not only manages another communication session identifier associated with the communication session identifier, but also holds communication session information associated with the communication session identifier. The communication session transmission / reception processing unit 243 registers or deletes information in the terminal identifier information management database 241 according to a terminal identifier registration or deletion request from the communication application 213 or 221. Further, it extracts the information of the terminal identifier of the communication partner necessary for actually establishing the communication session.
[0019]
In the communication session identifier management database 242, a communication session identifier and information of a communication session associated therewith are registered when a communication session is connected. At the time of transfer of the communication session, information of the communication session is extracted using the communication session identifier as a key. Further, in response to a request for transfer of session information of the communication application 213 of the transfer source terminal 21, a communication session is connected with another terminal (a transfer destination terminal), and a communication session identifier obtained as a result and a communication session associated therewith are connected. The information is associated with the communication session identifier corresponding to the original (the transfer source terminal and the communication destination terminal) communication session identifier, and registered (updated) in the communication session identifier management database 242.
[0020]
When the communication session transmission / reception unit 2212 in the communication application 221 of the communication destination terminal 22 and the communication session transmission / reception processing unit 2132 in the communication application 213 of the transfer destination terminal 23 perform communication, the transfer destination The communication session transmission / reception processing unit 243 uses the communication session identifier management database 242 to convert the communication session so that the terminal 21 appears to be connected to the communication. As a result, when the transfer of the session information from the transfer source terminal 21 to the transfer destination terminal 23 is completed, the communication between the transfer destination terminal 23 and the communication destination terminal 22 is exchanged with the transfer source terminal 21 for the communication destination terminal 22. looks like.
[0021]
After the transfer of the session is completed and the session is disconnected from the transfer source terminal 21, if the session disconnection request comes from the transfer destination terminal 23 or the communication destination terminal 22, the communication session identifier management database 242 is used. Then, the session is disconnected, and the session identifier related to the communication session and the information associated therewith are deleted from the communication session identifier management database 242. Further, it prepares the media transmission / reception processing unit 244 of the session and media relay server 24 for media transmission / reception, manages media transmission / reception, and starts, ends, and discards media relay (copy relay). Also indicate. The communication media transmission / reception processing unit 244 is controlled by the communication session transmission / reception processing unit 243, and transmits / receives media to / from the communication media transmission / reception processing unit 2133 or 2213 of the communication application. The communication application 221 of the communication destination terminal 22 is basically similar to the communication application 213 of the transfer source terminal 21 and the transfer destination terminal 23, but the transfer processing unit for transferring the session information of the communication session transmission / reception processing unit 2212 is Not required.
[0022]
(Switching sequence chart)
FIG. 3 is an example of a sequence chart for switching a communication session and a communication medium of a transfer source terminal to a transfer destination terminal.
In FIG. 3, the upper part separated by a thick line is a session establishment phase, the middle part is a phase in which communication media is transferred, and the lower part is a phase in which disconnection is performed from a communication destination terminal. The positions of the vertical lines indicate the transfer source terminal 21, the transfer destination terminal 23, the session and media relay server 24, and the communication destination terminal 22 from the left side.
[0023]
(Session establishment phase)
First, a phase in which the transfer source terminal 21 and the communication destination terminal 22 establish a session via the session and media relay server 24 will be described.
It is assumed that the terminal identifiers of the transfer source terminal 21 and the communication destination terminal 22 and their associated addresses and port numbers are registered in the session and media relay server 24 in advance. The session connection request is transmitted from the communication application 213 of the transfer source terminal 21 to the communication application 221 of the communication destination terminal 22 (301). It is assumed that communication applications of the transfer source terminal 21 and the transfer destination terminal 23 are set in advance so as to pass through the session and media relay server 24 on the way.
[0024]
The session and media relay server 24 that has received the session connection request performs a process of rewriting the information of the communication medium described in the received session connection request. Specifically, the address, port number, and the like of the communication application of the transfer source terminal 21 existing in the information of the communication medium are replaced with the address, port number, and the like of the communication medium transmission / reception processing unit. As a result, the communication media transmitted from the communication destination terminal 22 can be received by the session and media relay server 24. Also, for the identifier of the communication session, it manages the address, port number, etc., which the communication application of the transfer source terminal 21 was to receive, and the address, port number, etc. of its own communication media transmission / reception processing unit. This is used to relay the communication medium received from the communication destination terminal 22 and determine the destination of the communication application of the terminal to be transmitted (such as the transfer source terminal).
[0025]
Thereafter, in the subsequent communication from the communication destination terminal 22, the session connection request in which the parameters are set so as to pass through the session and media relay server 24 is transferred to the communication destination terminal 22 (302). The session connection response is returned from the communication destination terminal 22 (303), and the response is similarly relayed to the session and media relay server 24. Upon receiving the session connection response, the session and media relay server 24 performs a process of rewriting the communication media information described in the session connection response. Specifically, the address, port number, and the like, which are to be received by the communication application of the communication destination terminal 22 existing in the communication medium information, are replaced with the address, port number, and the like of its own communication medium transmission / reception processing unit. As a result, the communication media transmitted from the transfer source terminal 21 can be received by the session and media relay server 24.
[0026]
Also, for the identifier of the communication session, it manages the address, port number, etc., which the communication application of the communication destination terminal 22 is supposed to receive, and the address, port number, etc. of its own communication media transmission / reception processing unit. This is used to relay the communication medium received from the transfer source terminal 21 and determine the destination of the communication application of the communication destination terminal 22 to be transmitted. After that, the session connection response is transferred to the transfer source terminal 21 (304). The communication application of the transfer source terminal 21 transmits a notification of the completion of the session connection to the communication destination terminal 22 through the session and media relay server 24 (305, 306).
[0027]
There is a case where the information of the communication medium is not included in the session connection request transmitted by the communication application of the first transfer source terminal 21. At this time, the session and media relay server 24 transfers the request to the communication destination terminal 22, The address, port number, and the like of the communication application received in the information of the communication medium included in the session connection response returned from the communication application of the destination terminal 22 and the completion of the session connection transmitted from the communication application of the transfer source terminal 21 The address and port number of the communication application that are present in the information of the communication media to be received are converted into the address and port number of the communication media transmission / reception processing unit of the session and media relay server 24 itself.
[0028]
Of course, management for the identifier of the communication session is also performed. Accordingly, the communication application installed in the transfer source terminal 21 and the communication destination terminal 22 transmits and receives communication media (audio and video) to and from the session and media relay server 24. The session and media relay server 24 performs a process of relaying the communication media with the terminal to be transmitted / received based on the information managed for the identifier of the communication session (307, 308). The above processing is connection of a communication session from the transfer source terminal 21, but connection of a communication session of the communication destination terminal 22 is also possible.
[0029]
(Transfer implementation phase)
Next, a phase in which a communication session and transfer of communication media are actually performed from the transfer source terminal 21 to the transfer destination terminal 23 will be described.
If the communication application of the transfer destination terminal 23 has not been started, transfer cannot be performed from the transfer source terminal 21, so that the transfer source terminal 21 issues an APL start request to the transfer destination terminal 23 via the session and media relay server 24. It is transmitted (309, 310). The APL start request includes information for starting a communication application capable of transferring a communication session and a communication medium. Upon receiving the APL start instruction, the transfer destination terminal 23 starts the communication application (311). When the start is completed, the transfer destination terminal 23 transmits the transfer destination terminal 23 to the session and media relay server 24 as a preparation stage for establishing a communication session. The terminal identifier of the terminal 23 and the address and port number of its own communication application corresponding to the terminal identifier are registered (312, 313).
[0030]
Thereafter, an APL activation response from the transfer destination terminal 23 is transmitted to the transfer source terminal 21 via the session and media relay server 24 (314, 315). The transfer source terminal 21 transmits a session information transfer to transfer the communication session (316). Although the request is transmitted to the communication destination terminal 22, in the present invention, by performing the processing in the session and media relay server 24, the communication destination switching operation of the communication destination terminal 22 becomes unnecessary. .
Upon receiving the session information transfer, the session and media relay server 24 returns a session information transfer response to the transfer source terminal 21 as an intermediate response (317). Thereafter, in the session and media relay server 24, the address and port number of the communication application corresponding to the terminal identifier are obtained from the terminal identifier of the transfer destination terminal 23 which is the transfer destination of the communication session in the session information transfer. The session connection request (318), session connection response (319), session connection completion (320), and session establishment exchange are performed as if the session connection request was made from the communication destination terminal 22 to the transfer destination terminal 23. carry out.
[0031]
In addition, the communication session identifier between the transfer source terminal 21 and the communication destination terminal 22 that first establishes the communication session and the communication session identifier between the transfer destination terminal 23 and the communication destination terminal 22 that are established after receiving the session information are linked. to manage. Thereafter, the session and media relay server 24 discards the communication media received from the communication application of the transfer source terminal 21 (322), and relays the communication media received from the transfer destination terminal 23 to the communication destination terminal 22. (323). Here, in this sequence example, the communication medium received from the communication application of the transfer source terminal 21 is to be discarded. However, there is a case where the communication medium is relayed to the communication destination terminal 22 without being discarded.
[0032]
In addition, a process of copying the communication media received from the communication application of the communication destination terminal 22 and relaying the copy to both the communication applications of the transfer source terminal 21 and the transfer destination terminal 23 is performed (321). As a result, the communication media from the communication destination terminal 22 flows to the transfer source terminal 21 and the transfer destination terminal 23 that have performed the transfer of the communication session, so that the user seems to switch the communication smoothly and seamlessly.
When the above processing is completed, the session and media relay server 24 transmits a session connection completion notification to the transfer source terminal 21 (324). The transfer source terminal 21 returns a session connection completion notification response (325), and then transmits a session disconnection request to the session and media relay server 24 to disconnect the communication session (326).
[0033]
The session and media relay server 24 determines that only the transfer source terminal 21 has been disconnected, and interrupts the transfer relay of the communication media from the communication destination terminal 22 to the transfer source terminal 21. In addition, a session disconnection response is transmitted to the transfer source terminal 21 (327). The communication application of the transfer source terminal 21 ends the transmission of the communication media to the session and media relay server 24 (328). Thereafter, the communication application of the transfer source terminal 21 deletes the terminal identifier of the transfer source terminal 21 and the address and port number of the own communication application corresponding to the terminal identifier of the transfer source terminal 21 to the session and media relay server 24 (332, 333). ). Thereafter, the communication application of the transfer source terminal 21 is terminated (334).
[0034]
(Session disconnection processing)
Finally, a case where disconnection is performed from the communication destination terminal 22 will be described. The communication destination terminal 22 transmits a session disconnection request to the session and media relay server 24 (335). Specifically, since the communication destination terminal 22 appears to maintain the state of the communication session and the communication medium that initially started with the transfer source terminal 21, the communication destination terminal 22 issues a session disconnection request to the identifier of the communication session. become. The session and media relay server 24 converts the communication session information based on the communication session identifier between the transfer destination terminal 23 and the communication destination terminal 22 linked to the communication session identifier, and Then, a session disconnection request is transmitted (336). The transfer destination terminal 23 proceeds to the process of terminating the transmission and reception of the communication media with the session and media relay server 24, and returns a session disconnection request response (337).
[0035]
When the session and media relay server 24 receives the session disconnection request response, the session and media relay server 24 proceeds to a process of terminating the transmission / reception with the transfer destination terminal 23 or the communication medium with the communication destination terminal 22 (338), and then communicates with the transfer destination terminal 23. By converting the information of the communication session based on the communication session identifier between the transfer source terminal 21 and the communication destination terminal 22 linked to the communication session identifier with the destination terminal 22, and transmitting the information to the communication destination terminal 22, It appears as if the response of the session disconnection has been returned from the transfer source terminal 21 to the communication destination terminal 22. Further, the session and media relay server 24 deletes the identifier of the communication session related to this series of processing. Finally, the communication destination terminal 22 that has received the session disconnection request response ends data transmission / reception with the session and media relay server 24 (336A, 337A).
[0036]
The above processing is the disconnection of the communication session from the communication destination terminal 22, but it is also possible to disconnect the communication session from the transfer destination terminal 23 (339).
The above-described session transfer process operates even when the transfer destination terminal 23 performs another session again. In other words, the operation is performed regardless of how many times the session transfer process is performed to another terminal.
[0037]
If the flow shown in FIG. 3 is converted into a program for each of the session and media relay server 24, the transfer source terminal 21, the transfer destination terminal 23, and the communication destination terminal 22 and stored in a recording medium such as a CD-ROM, A program recording medium for the server 24 is mounted on a computer serving as a server, and a program recording medium for the source terminal 21, the destination terminal 23, and the communication destination terminal 22 is mounted on each terminal, and a program is installed and installed. The present invention can be easily realized by executing. By selling these recording media, distribution of the program is also convenient.
[0038]
As a first effect of the present invention, the communication application of the communication destination terminal does not need to be an application that is aware that the communication session has moved from the transfer source terminal to the transfer destination terminal. Has no effect.
The reason is that even when the communication session moves from the source terminal to the destination terminal, the session and media relay server operates as if the communication application of the destination terminal is communicating with the communication application of the source terminal. This is because the information of the communication session is converted.
[0039]
A second advantage of the present invention is that a user who intends to perform transfer looks as if a communication session has moved smoothly without interruption of communication media.
The reason is that when the communication session is transferred from the communication application of the source terminal to the communication application of the destination terminal, the communication media from the communication application of the destination terminal is copied in the session and media relay server, and the communication of the source terminal is performed. This is to temporarily relay to both the application and the communication application of the transfer destination terminal.
[0040]
Further, as a third effect of the present invention, the user himself / herself can switch to the terminal to which he / she wants to transfer the communication session any number of times.
The reason is that the communication session can be continuously moved from the transfer source terminal to the first transfer destination terminal, from the first transfer destination terminal to another transfer destination terminal, and so on.
[0041]
【The invention's effect】
As described above, according to the present invention, it is possible to seamlessly switch between a communication session and a communication medium, and to determine that the communication application of the communication destination terminal has moved from the transfer source terminal to the transfer destination terminal. There is a remarkable effect that the user does not have to be conscious and can switch to the terminal to which the user wants to transfer the communication session any number of times.
[Brief description of the drawings]
FIG. 1 is a block diagram of a communication system according to an embodiment of the present invention.
FIG. 2 is a functional block diagram of a transfer source terminal, a transfer destination terminal, a communication destination terminal, and a session and media relay server in FIG. 1;
FIG. 3 is an operation sequence chart of a session and media relay method showing one embodiment of the present invention.
[Explanation of symbols]
11 to 14 network, 21 transfer source terminal, 22 communication destination terminal,
23: transfer destination terminal, 24: session and media relay server,
211: application control function, 212: transfer control function,
213: communication application (transfer source), 2131: UI function unit (transfer source),
2132: communication session transmission / reception processing unit (transfer source)
2133: Communication media transmission / reception processing unit (transfer source)
221, communication application (communication destination), 2211 ... UI function unit (communication destination),
2212: Communication session transmission / reception processing unit (communication destination)
2213: Communication media transmission / reception processing unit (communication destination)
241, terminal identifier information management database,
242 ... communication session identifier management database
243: communication session transmission / reception processing unit (server)
244: Communication media transmission / reception processing unit (server).

Claims (8)

The communication application of the source terminal that is to perform the transfer and the communication application of the destination terminal that is communicating with the communication application of the source terminal communicate via a session and media relay server that relays a communication session and media. Transfer the communication session of the communication application of the transfer source terminal to the communication application of the transfer destination terminal, which is a terminal different from the transfer source terminal and the communication destination terminal, so that the session and the media enabling seamless continuation of communication A relay method,
Even when a communication session moves from the source terminal to the destination terminal, the session and media relay server communicates with the communication application of the destination terminal as if communicating with the communication application of the source terminal. A session and media relay method, comprising converting session information. The communication application of the source terminal that is about to perform the transfer and the communication application of the destination terminal that is communicating with the communication application of the source terminal are connected via the session and media relay server that relays the communication session and the media. Communicating, transferring the communication session of the communication application of the transfer source terminal to the communication application of the transfer destination terminal which is another terminal different from the transfer source terminal and the communication destination terminal, and a session enabling seamless continuation of communication. Media relaying method,
At the stage of transferring the communication session from the communication application of the source terminal to the communication application of the destination terminal, the communication media from the communication application of the destination terminal is copied by the session and media relay server and communicates with the communication application of the source terminal. A session and media relay method for temporarily relaying to both communication applications of a destination terminal. The communication application of the source terminal that is about to perform the transfer and the communication application of the destination terminal that is communicating with the communication application of the source terminal are connected via the session and media relay server that relays the communication session and the media. A session that communicates and transfers a communication session of a communication application of the transfer source terminal to a communication application of a transfer destination terminal that is a terminal different from the transfer source terminal and the communication destination terminal, and enables seamless continuation of communication. And a media relay method,
At the stage of transferring the communication session from the communication application of the source terminal to the communication application of the destination terminal, only one of the communication media from the communication application of the source terminal or the destination terminal to the communication application of the destination terminal is transferred. A session and media relay method, wherein the session and media are relayed by a session and media relay server. The communication application of the source terminal that is about to perform the transfer and the communication application of the destination terminal that is communicating with the communication application of the source terminal are connected via the session and media relay server that relays the communication session and the media. A session that communicates and transfers a communication session of a communication application of the transfer source terminal to a communication application of a transfer destination terminal that is a terminal different from the transfer source terminal and the communication destination terminal, and enables seamless continuation of communication. And a media relay method,
In the step of transferring the communication session from the communication application of the source terminal to the communication application of the destination terminal, both the communication media from the communication application of the source terminal and the destination terminal to the communication application of the destination terminal are session-and-media. A session and media relay method, wherein the session and the media are destroyed in a relay server. The communication application of the source terminal that is about to perform the transfer and the communication application of the destination terminal that is communicating with the communication application of the source terminal are connected via the session and media relay server that relays the communication session and the media. A session that communicates and transfers a communication session of a communication application of the transfer source terminal to a communication application of a transfer destination terminal that is a terminal different from the transfer source terminal and the communication destination terminal, and enables seamless continuation of communication. And a media transfer method,
A session which enables continuous movement of a communication session from the source terminal to a first destination terminal, from the first destination terminal to another destination terminal, and so on. Media transfer method. A session and media relay program in a session and media relay server,
Receiving the session connection request, a procedure for rewriting the information of the communication medium described in the session connection request, the address of the communication application of the transfer source terminal to be received with respect to the identifier of the communication session, Procedure for managing the port number and the address of its own communication media transmission / reception processing unit, port number, etc. Session connection with parameters set so that subsequent communication from the destination terminal passes through the session and media relay server A procedure for transferring a request to a destination terminal, a procedure for transferring a session connection response to a source terminal, and relaying a terminal and a communication medium to be transmitted / received based on information managed for a communication session identifier. When the session information transfer is received, the session response The procedure for returning the communication information transfer response to the transfer source terminal, and discarding the communication media received from the communication application of the transfer source terminal, while relaying the communication media received from the transfer destination terminal to the communication destination terminal Procedure, copying the communication media received from the communication application of the communication destination terminal, relaying the communication media to both the communication application of the transfer source terminal and the transfer destination terminal, transmitting the session connection completion notification to the transfer source terminal, transfer source terminal A procedure for suspending the relay of the copy of the communication media from the communication destination terminal, converting the communication session information based on the communication session identifier between the transfer destination terminal and the communication destination terminal associated with the communication session identifier, A procedure for transmitting a session disconnection request to the transfer destination terminal. That the transfer destination terminal and a procedure for ending transmission and reception of the communication media of the communication destination terminal, session and media relay program for executing. A session and media relay program at a transfer source terminal,
A procedure for transmitting a session connection request to a communication application of a communication destination terminal, a procedure for transmitting a notification of session connection completion to a communication destination terminal through a session and media relay server, and starting an APL to a transfer destination terminal via the session and media relay server Sending a request, sending a session information to transfer a communication session, sending a session connection completion notification response, sending a session disconnection request to the session and media relay server to disconnect the communication session The procedure, the procedure for ending the transmission of communication media to the session and media relay server, and the deleting of the terminal identifier of the transfer source terminal and the address and port number of its own communication application corresponding to the session and media relay server. Procedures, the procedure to terminate the communication application, the communication session and communication media relay program for executing. A computer-readable recording medium for recording the session and media relay program according to claim 6.

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