JP2008011122A - Communication device - Google Patents

Abstract

A terminal that cannot communicate with a terminal used by a communication partner is prevented from being registered in a location server.
In a communication apparatus 300 that communicates with other apparatuses on a network by SIP, first information that stores address information of a terminal of a first user in association with first media information used for communication at the terminal. A storage unit 340; a second information storage unit 350 that stores user name information of an external second user in association with second media information used in communication at a terminal used by the second user; and address information When the signal is received, the first information storage unit 340 retrieves the first media information associated with the address information, compares the first media information with the second media information stored in the second information storage unit 350, A media collation unit 360 that collates whether communication is established between the terminal used by the first user and the terminal used by the second user and outputs a collation result.
[Selection] Figure 2

Description

  The present invention relates to a communication apparatus that communicates with other apparatuses on a network using a SIP (Session Initiation Protocol) location server.

  In recent years, an IP (Internet Protocol) telephone system that uses a network such as the Internet instead of a conventional telephone line is rapidly spreading. In the IP telephone system, a unique user name is associated with a network address of a terminal to be used for each user, and when a call is made, a communication destination terminal connected to the Internet is searched for and called.

  SIP (Session Initiation Protocol) is known as a protocol used in such an IP telephone system. When using SIP, a location server in which user name information and terminal address information are registered in association with each other is provided on the network. In communication using SIP, user name information and terminal address information of each terminal are registered in advance in a location server. The caller terminal communicates with the location server at the time of outgoing call, and acquires the address of the callee terminal via the location server.

  Also, in this IP telephone system, when starting a session, media information including information on encoding methods that can be handled by the terminal is exchanged between the communication source and the communication destination terminal, and the communication source terminal communicates with the communication destination. It is determined whether or not communication with the other terminal is possible. Here, there are various types of terminals used in the IP telephone system, such as personal computers, PDAs, fixed telephones, mobile phones, etc., and encoding that can be used for communication between the caller terminal and the callee terminal. Are often different. Therefore, there is no guarantee that different types of communication devices can communicate with each other. Note that the location server does not store media information of each terminal.

As this type of IP telephone system, there is known a communication device in which a codec used in advance by a partner is stored in a memory (see, for example, Patent Document 1). In the communication apparatus described in Patent Document 1, the type of codec is determined at the time of outgoing call based on the codec of the other party stored in the memory.
Japanese Patent Laid-Open No. 2004-120282

  However, when the communication device of Patent Document 1 is used for the SIP IP telephone system, the communication device does not hold the media information of the communication partner device, so the user communicates with the communication partner terminal during registration with the location server. It cannot be determined whether it is possible. As a result, there is a case where a user cannot register a terminal incapable of communication with the location server even though communication with a desired communication partner cannot be established.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a communication device that can prevent a terminal that cannot communicate with a terminal used by a communication partner from being registered in a location server. There is to do.

In order to achieve the above object, in the present invention,
In a communication device that communicates with other devices on the network by SIP (Session Initiation Protocol),
A first information storage unit that stores address information of the terminal of the first user in association with first media information used for communication at the terminal;
A second information storage unit for storing user name information of an external second user in association with second media information used for communication at a terminal used by the second user;
When the signal related to the address information is received, the first media information associated with the address information is retrieved from the first information storage unit, and the first media information and the second information storage unit are stored in the first media information. A media verification unit that compares second media information, verifies whether communication is established between the terminal used by the first user and the terminal used by the second user, and outputs a verification result; A communication device is provided.

  According to this communication apparatus, when receiving a signal related to address information, the media verification unit retrieves the first media information from the first information storage unit and compares the second media information stored in the second information storage unit. . And since the collation result as to whether communication is established between the terminal used by the first user and the terminal used by the second user is output, the first user communicates between the using terminal and the desired communication destination. It can be confirmed whether or not it is possible.

In order to achieve the object, in the present invention,
In a communication device that communicates with other devices on the network by SIP (Session Initiation Protocol),
A first information storage unit that stores address information of the terminal of the first user in association with first media information used for communication at the terminal;
A second information storage unit for storing user name information of an external second user in association with second media information used for communication at a terminal used by the second user;
When the signal related to the address information is received, the first media information associated with the address information is retrieved from the first information storage unit, and the first media information and the second information storage unit are stored in the first media information. A media collation unit that compares second media information, collates whether communication is established between the terminal used by the first user and the terminal used by the second user, and outputs a collation result;
A registration unit that communicates with a location server on the network and transmits a registration message for registering user name information and address information to the location server; and
The communication unit is provided, wherein the registration unit transmits the address information to the media verification unit when registering with the location server.

Furthermore, in order to achieve the object, in the present invention,
In a communication device that communicates with other devices on the network by SIP (Session Initiation Protocol),
A first information storage unit that stores address information of the terminal of the first user in association with first media information used for communication at the terminal;
A second information storage unit for storing user name information of an external second user in association with second media information used for communication at a terminal used by the second user;
When the signal related to the address information is received, the first media information associated with the address information is retrieved from the first information storage unit, and the first media information and the second information storage unit are stored in the first media information. A media collation unit that compares second media information, collates whether communication is established between the terminal used by the first user and the terminal used by the second user, and outputs a collation result;
A SIP communication unit that performs SIP communication with other devices via the location server;
Storage for updating the user name information and the second media information in the second information storage unit using the user name information and media information of the other device acquired at the time of communication with the other device in the SIP communication unit An update unit is provided, and a communication device is provided.

  According to the present invention, the user can take measures such as registering another terminal in the location server, and prevent the user from registering a terminal that cannot communicate with the terminal used by the communication partner in the location server. be able to.

  1 to 10 show an embodiment of the present invention, and FIG. 1 is a schematic configuration diagram of a SIP IP telephone system.

  As shown in FIG. 1, the IP telephone system 1 includes a SIP location server 200 connected to the Internet 100 and communication devices 300, 400, 500, 600, 700 connected to the Internet 200. Yes. Here, the first user can use the three communication devices 300, 400, and 500, and the second user separate from the first user can use the one communication device 600 and 700. In FIG. 1, there are two second users, and each can use the communication devices 600 and 700. Specifically, the communication devices 300, 400, and 500 used by the first user are, for example, desktop personal computers, PDAs, mobile phone terminals, and the like, and the first user uses each of the communication devices 300, 400, and 500. It is used properly depending on the situation.

  Here, the SIP will be described. Each of the communication devices 300, 400, 500, 600, and 700 performs communication by transmitting and receiving a “request” signal and a “response” signal via the location server 200. Here, the “request” is expressed by a SIP-specific “method”, for example, “INVITE” if the content of the “request” is session establishment, and “ACK” if the session establishment is confirmed. When the session ends, it is expressed as “BYE”, and when the session establishment is canceled, it is expressed as “CANCEL”. Note that if it is registered in the location server 200, it is expressed as “REGISTER”. In addition, “response” is expressed by a response code. For example, if the content of “response” indicates that the request is received and the processing is being executed, it is expressed as “1xx”. If there is, it is expressed as “2xx”. Here, x is a number or the like arbitrarily set according to the processing content.

  The location server 200 includes a communication control unit that communicates with each of the communication devices 300, 400, 500, 600, and 700 via the Internet 100, and a storage unit in which the user name information 800 and the address information 810 are registered in association with each other. Have. In the present embodiment, the user name information 800 is a name unique to the SIP assigned to each user in the communication of the IP telephone system 1, and the address information 810 indicates the position of the communication device used by the user on the Internet 100. The unique address shown. The user name information 800 and the address information 810 are registered in the location server 200 by a communication device on the Internet 100.

FIG. 2 is a block diagram illustrating a schematic configuration of the communication apparatus, and FIG. 3 is a block diagram illustrating transmission / reception of information in the communication apparatus.
As shown in FIGS. 2 and 3, the communication device 300 includes, for example, an input unit 310 that has a keyboard or the like and receives the communication partner user name information 800 or the like by user operation input, and the communication partner user from the input unit 310. Based on the input of the name information 800, an SIP communication unit 320 that performs SIP communication with an external communication device is included. As illustrated in FIG. 2, the SIP communication unit 320 includes a SIP reception unit 322, a SIP transmission unit 324, a registration processing unit 326, an INVITE processing unit 328, and a communication processing unit 330.

  The SIP receiving unit 322 distributes the SIP message to a processing unit for each type of SIP message according to the type of the SIP message received from the outside. That is, when receiving a message related to “INVITE” of SIP, the SIP receiving unit 322 transmits the received message to the INVITE processing unit 328. Here, whether or not the message is related to “INVITE” can be determined by whether or not the method described in the “Cseq” header field of the message is “INVITE”. Here, the SIP message includes a start line, a SIP header part, and a SIP body part.

  As described above, the SIP message can be divided into a request and a response. In the case of a request message, the message type is described in the start line. And "INVITE" is used to set up a session. The SIP body part of the “INVITE” request includes media information that the “INVITE” transmission side desires to use. On the other hand, the start line of the response message of the response is composed of the SIP version, status code, and Reason information. When the “INVITE” request is successful, the status code of the response message is “200 / OK”. When the status code is “200 / OK”, media information 810 specified by the response message transmission side is described in the body portion of the response message.

  The INVITE processing unit 328 performs processing related to SIP “INVITE”. Specifically, when receiving the “INVITE” request, the INVITE processing unit 328 generates a response message and transmits the generated response message to the SIP transmission unit 324. Then, the SIP transmission unit 324 transmits the response message generated by the INVITE processing unit 328 to the location server 200.

  The registration processing unit 326 registers user name information 800 and address information 810 in the location server 200. Registration processing unit 326 generates registration message 830 using user name information 800 and address information 810 received by input unit 310 in the registration mode, and transmits registration message 830 to SIP transmission unit 324. Then, the SIP transmission unit 324 transmits the registration message 830 generated by the registration processing unit 326 to the location server 200.

  Here, the registration processing unit 326 can generate the registration message 830 associated with the user name information 800 for the address information 810 other than the own device. In the present embodiment, the other communication devices 400 and 500 used by the first user do not have a registration function with the location server 200, and the first user performs registration work exclusively using the communication device 300. . When the registration processing unit 326 transmits the registration message 830 to the SIP transmission unit 324, the registration processing unit 326 transmits the address information 810 of the registration message 830 to the media verification unit 360 described later.

  When communication with the outside of the apparatus is established, the communication processing unit 330 communicates with the external apparatus by data transmission / reception using a predetermined encoding method. In the present embodiment, the encoding method of the communication processing unit 330 is “audio: pcmu / 800 video: mpeg4”, and can communicate with an external device.

  In addition, the communication device 300 corresponds to the address information 810 of each communication device 300, 400, 500, which is the terminal used by the first user, in the address information 800, with the first media information 822 used for communication at the terminal. A first information storage unit 340 is additionally provided for storing the information. Here, the first media information 822 includes information related to the encoding method described above.

  The first information storage unit 340 holds a first table 342 composed of each address information 810 and first media information 822. In this embodiment, as shown in FIG. 4, “211.0.0.5” is stored as the address information 810 of the communication apparatus 300, and “audio: pcmu / 800 video: mpeg4” is stored as the first media information 822 associated therewith. Is stored. FIG. 4 is an explanatory diagram showing the first table. Further, “211.0.0.10” is stored as the address information 810 of the communication apparatus 400, and “video: mpeg2” is stored as the first media information 822 associated therewith. Furthermore, “211.0.0.15” is stored as the address information 810 of the communication apparatus 500, and “video: mpeg2” is stored as the first media information 822 associated therewith.

  In addition, the communication apparatus 300 includes a second information storage unit 350 that stores the user name information 800 of the second user in association with the second media information 824 used in the communication apparatus 600 that is the terminal used by the second user. Have.

  The second information storage unit 350 holds a second table 352 including user name information 800 and second media information 824. In the present embodiment, as shown in FIG. 5, “tom” is stored as the user name information 800 of the communication apparatus 600, and “audio: pcmu / 800 video: mpeg4” is stored as the second media information 824 associated therewith. Is remembered. Here, FIG. 5 is an explanatory diagram showing the second table. Furthermore, “alice” is stored as the user name information 800 of the communication apparatus (not shown), and “video: mpeg2” is stored as the second media information 824 associated therewith.

  When the communication device 300 receives a signal related to the address information 810 via the bus in the device, the communication device 300 searches the first information storage unit 340 for the first media information 822 associated with the address information 810, and Whether communication is established between the terminal used by the first user and the terminal used by the second user by comparing the first media information 822 and the second media information 824 stored in the second information storage unit 350 And a media collation unit 360 that collates the data and outputs a collation result. In the present embodiment, the media verification unit 360 performs verification when receiving the address information 810 from the registration unit 330.

  In addition, the communication apparatus 300 includes a display unit 370 including a display, for example, and the collation result information 840 is output from the media collation unit 360 to the display unit 370. That is, in the present embodiment, the display unit 370 is a verification result notification unit that notifies the first user of the verification result. In the present embodiment, the collation results are displayed in a list for all users stored in the second information storage unit 350.

  Furthermore, the communication device 300 uses the first table 342 and the second table 352 stored in the first information storage unit 340 and the second information storage unit 350 based on the information received from the input unit 310 in the table rewriting mode. Has a table rewriting unit 380 for rewriting. As a result, the user of the communication terminal 300 can appropriately add, delete, modify, etc. the information 800, 810, 822, and 824 of the tables 342 and 352.

  The operation of the communication apparatus 300 configured as described above will be described with reference to the flowchart of FIG.

  First, when registration to the location server 200 is accepted by the input unit 310 (step S1), a SIP registration message 830 is created by the registration unit 350 based on the input information, and this registration message 830 is sent to the location server 200. It is transmitted (step S2). 7 and 8 show examples of the input screen of the display unit, and examples of the registration messages of FIGS. 9 and 10 are shown. 7 and 9, the user name information 800 is “sis: bob@example.com” and the address information 810 is “211.0.0.5”. In FIGS. 8 and 10, the user name information 800 is “sis: bob@example.com”. @ example.com ”and the address information 810 is“ 211.0.0.10 ”.

  At this time, the address information 810 received by the input unit 310 is transmitted from the registration unit 330 to the media verification unit 360 (step S3). When the information shown in FIG. 7 is registered, “211.0.0.5” which is the address information 810 is transmitted to the media verification unit 380, and when the information shown in FIG. 8 is registered, “211.0.0.10” which is the address information 810. "Is transmitted to the media verification unit 380.

  Upon receiving the address information 810, the media collation unit 360 refers to the first table 342 of the first information storage unit 340 and searches for the first media information 822 corresponding to the address information 810 (step S4). Specifically, when the information shown in FIG. 7 is registered, the first table 342 is referred to using “211.0.0.5” as a key, and the first media information 822 paired with the first table 342 is associated with the first table 342. “Audio: pcmu / 800 video: mpeg4” is searched.

  Then, the media collation unit 360 compares the retrieved first media information 822 with the second media information 824 of the second table 352 stored in the second information storage unit 350 to determine whether communication is possible. Collation is performed (step S5). In the present embodiment, the media collation unit 360 collates all the users stored in the second information storage unit 350, and displays a list of the collation results on the display unit 370 (step S6).

  Specifically, when the information illustrated in FIG. 7 is registered, “audio: pcmu / 800 video: mpeg4” can be communicated as the second media information 824 that can communicate with “audio: pcmu / 800 video: mpeg4”. It is determined that “video: mpeg2” is incommunicable. Then, “tom:” associated with “audio: pcmu / 800 video: mpeg4” indicates that communication is possible, and “alice” associated with “video: mpeg2” indicates that communication is not possible. Is displayed.

  As described above, in the communication apparatus 300 of the present embodiment, when registering with the location server 200, whether or not communication is possible between the registered terminal and the communication destination terminal is output. It can be confirmed whether or not the terminal in use can communicate with the desired communication destination. Therefore, the user can take measures such as registering another terminal using the registration unit 330, and prevent the user from registering a terminal incapable of communicating with the terminal used by the communication partner in the location server 200. be able to.

  If the user registers the information 800, 810, 822, and 824 in the first table 342 and the second table 352, the information 800, 810, 822, and 824 are stored in the storage units 340 and 350, respectively. Therefore, it is not necessary to store these information 800, 810, 822, and 824 in another device or to remember them, which is extremely advantageous in practical use.

  In the above embodiment, all the user name information 800 stored in the second information storage unit 350 is displayed as a collation result. However, only a part of the user name information 800 is displayed. May be. For example, only the user name information 800 that can be communicated may be displayed, or only the user name information 800 that cannot be communicated may be displayed.

  Alternatively, the user name information 800 for determining whether communication is possible or not may be received from the input unit 310 in advance, and it may be determined whether communication is possible only for the received user name information 800. Furthermore, user name information 800 for determining whether communication is possible or not at the time of registration in the location server 200 may be received from the input unit 310, and only the received user name information 800 may be displayed.

  In the above embodiment, the collation result is output to the display unit 370. However, the collation result output to the e-mail address designated by the user may be notified. Furthermore, instead of visually informing using the display unit 370, for example, an auditory notification may be made by voice guidance or the like, and the configuration of the collation result notifying unit is arbitrary.

  In the above embodiment, when the registration processing unit 330 transmits the registration message 830 to the SIP transmission unit 324, the address information 810 is transmitted from the registration processing unit 330 to the media verification unit 360. The address information 810 may be directly transmitted from the input unit 310 to the media verification unit 360. In this case, for example, as shown in FIG. 11, before the registration processing unit 330 creates the registration message 830, the display unit 370 displays whether communication is possible, and inquires of the user through the display unit 370 whether to register (step S7). ), A registration message 830 may be transmitted to the location server 200 when there is a registration instruction from the user. In short, the media verification unit 360 may perform verification using the reception of the address information 810 as a trigger, and the transmission source of the address information 810 to the media verification unit 360 is not limited to the registration processing unit 330.

  In the above embodiment, the present invention is applied to the communication device 300 of the IP telephone system 1. However, it is needless to say that any system using SIP can be applied to communication devices of other systems. It is.

  FIGS. 12 to 15 show a second embodiment of the present invention, FIG. 12 is a block diagram showing a schematic configuration of a communication apparatus, and FIG. 13 is a block diagram showing transmission / reception of information in the communication apparatus. . In the second embodiment, a registration processing unit, an INVITE processing unit, and a second table are different from those in the first embodiment.

  As shown in FIGS. 12 and 13, in the second embodiment, in addition to the registration function for the location server 200, the registration processing unit 326a uses the address information 810 registered in the location server 200 for the own device. In some cases, it includes a prohibition unit 326 b that prohibits transmission of the address information 810 to the media verification unit 360. That is, transmission of address information 810 is permitted only when the first user registers communication terminals 400 and 500 other than communication terminal 300.

  In the second embodiment, the INVITE processing unit 328a uses the user name information 800 and the media information 820 acquired when communicating with the external communication devices 600 and 700, and uses the user of the second information storage unit 350. A storage update unit 328 b that updates the name information 800 and the second media information 824 is provided. As a result, the second table 354 stored in the second information storage unit 350 is updated during the “INVITE” process.

  Here, an example of a request message of “INVITE” is shown in FIG. As shown in FIG. 14, the SIP header part of the request message 840 includes user name information 800 on the transmission side and user name information 800 on the reception side. Further, media information 820 is included in the SIP body portion of the request message 840.

  Specifically, if the received SIP message is an “INVITE” request of the communication partner, the storage update unit 328b extracts the From header field included in the “INVITE” request message, and the user name included in the extracted From header field. Information 800 is acquired. Here, if the received SIP message is the “INVITE” response message of the communication partner, the To header field included in the INVITE response message is extracted, and the user name information 800 included in the extracted To header field is acquired.

  Further, the storage update unit 328b extracts the media information 820 from the body part of the received SIP message, where the port number of the m line is other than 0 and the address of the c field is the same as the address information 810 of the Contact header field, This is second media information 824. Here, the m line of the SDP in the body part shown in FIG. 14 represents the media information 820. The m line includes a port number in addition to the media information 820. In the 200 / OK response, the media information whose port number is 0 represents use refusal. Also, the c line of the SDP in the body part shown in FIG. 14 represents connection data information. The c line contains the connection address for video and audio exchanges. The storage update unit 328b updates the second table 354 with the user name information 800 and the media information 820 acquired in this way as a set.

  Here, in the second embodiment, the user name information 800 in the second table 354 is in a format used during the “INVITE” process. Specifically, as shown in FIG. 15, the user name information 800 is “tom@example.com” and “alice@abc.com”. As a result, it is not necessary to perform an information conversion operation or the like in the storage update unit 328b.

  As described above, according to the communication device 300 of the second embodiment, in addition to the same operation as that of the first embodiment, the second table 354 is updated using the media information 820 of the device communicating with the own device. Therefore, the user does not need to register the desired communication partner in the second table 354 in advance. Since the second table 354 is automatically updated every time communication processing with another device is performed by SIP, the second table 354 can always be kept up-to-date, which is extremely advantageous in practical use. .

  In the second embodiment, the INVITE processing unit 328a includes the storage update unit 328b. However, another processing unit of the SIP communication unit 320 may include the storage update unit. In short, the SIP communication unit 320 uses the user name information 800 and the media information 820 of the other device acquired when communicating with the other device, and uses the user name information 800 and the second media information 824 of the second information storage unit 350. Should be updated.

  In the second embodiment, the display content and display method of the collation result are arbitrary, and it is needless to say that the specific detailed structure can be appropriately changed.

1 is a schematic configuration diagram of a SIP IP telephone system showing a first embodiment of the present invention. It is a block diagram which shows schematic structure of a communication apparatus. It is a block diagram which shows transmission / reception of the information in a communication apparatus. It is explanatory drawing which shows a 1st table. It is explanatory drawing which shows a 2nd table. It is a flowchart which shows operation | movement of a communication apparatus. It is a figure which shows the example of the input screen of a display part. It is a figure which shows the example of the input screen of a display part. It is a figure which shows the example of a registration message. It is a figure which shows the example of a registration message. It is a flowchart which shows a modification and shows operation | movement of a communication apparatus. FIG. 5 is a block diagram illustrating a schematic configuration of a communication apparatus according to a second embodiment of the present invention. It is a block diagram which shows transmission / reception of the information in a communication apparatus. It is a figure which shows the example of the request message of "INVITE". It is explanatory drawing which shows a 2nd table.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Communication system 100 Internet 200 Location server 300 Communication terminal 310 Input part 320 SIP communication part 322 SIP reception part 324 SIP transmission part 326 Registration process part 326a Registration process part 326b Prohibition part 328 INVITE process part 328a INVITE process part 328b Storage update part 330 Communication processing unit 340 First information storage unit 342 First table 350 Second information storage unit 352 Second table 354 Second table 360 Media verification unit 370 Display unit 380 Table rewriting unit 400 Communication terminal 500 Communication terminal 600 Communication terminal 700 Communication terminal 800 User name information 810 Address information 820 Media information 822 First media information 824 Second media information 830 Registration message 840 Request message

Claims (5)

In a communication device that communicates with other devices on the network by SIP (Session Initiation Protocol),
A first information storage unit that stores address information of the terminal of the first user in association with first media information used for communication at the terminal;
A second information storage unit for storing user name information of an external second user in association with second media information used for communication at a terminal used by the second user;
When the signal related to the address information is received, the first media information associated with the address information is retrieved from the first information storage unit, and the first media information and the second information storage unit are stored in the first media information. A media verification unit that compares second media information, verifies whether communication is established between the terminal used by the first user and the terminal used by the second user, and outputs a verification result; Communication equipment. In a communication device that communicates with other devices on the network by SIP (Session Initiation Protocol),
A first information storage unit that stores address information of the terminal of the first user in association with first media information used for communication at the terminal;
A second information storage unit for storing user name information of an external second user in association with second media information used for communication at a terminal used by the second user;
When the signal related to the address information is received, the first media information associated with the address information is retrieved from the first information storage unit, and the first media information and the second information storage unit are stored in the first media information. A media collation unit that compares second media information, collates whether communication is established between the terminal used by the first user and the terminal used by the second user, and outputs a collation result;
A registration unit that communicates with a location server on the network and transmits a registration message for registering user name information and address information to the location server; and
The registration unit transmits the address information to the media verification unit when registering with the location server.   The registration unit includes a prohibition unit that prohibits transmission of the address information to the media verification unit when the address information registered in the location server is that of the own device. 2. The communication device according to 2. In a communication device that communicates with other devices on the network by SIP (Session Initiation Protocol),
A first information storage unit that stores address information of the terminal of the first user in association with first media information used for communication at the terminal;
A second information storage unit for storing user name information of an external second user in association with second media information used for communication at a terminal used by the second user;
When the signal related to the address information is received, the first media information associated with the address information is retrieved from the first information storage unit, and the first media information and the second information storage unit are stored in the first media information. A media collation unit that compares second media information, collates whether communication is established between the terminal used by the first user and the terminal used by the second user, and outputs a collation result;
A SIP communication unit that performs SIP communication with other devices via the location server;
Storage for updating the user name information and the second media information in the second information storage unit using the user name information and media information of the other device acquired at the time of communication with the other device in the SIP communication unit And an updating unit.   5. The communication apparatus according to claim 1, further comprising: a collation result notifying unit that outputs the collation result from the media collating unit and notifies the collation result to the first user. 6.