JP6044066B2 - Communication network system, traffic reduction method in communication network system, communication control device, control method and control program thereof, and communication terminal - Google Patents

Description

  The present invention relates to a traffic mitigation technique in a communication network system including IMS (IP Multimedia Subsystem).

  In the above technical field, as shown in Patent Document 1, a technique is known in which a terminal and a terminal that perform communication exchange terminal capability information with a counterpart terminal by an OPTIONS message via a plurality of IMSs. Yes. Patent Document 2 describes that S-SCSF (Serving call session control function) holds IMS client function information.

Special table 2008-546347 JP 2010-239292 A

  However, in the technique described in Patent Document 1, since frequent capability information exchange is performed between terminals, traffic may increase. As a result, other services such as VoIP (Voice over Internet Protocol) are expected to be affected. On the other hand, in Patent Document 2, the function information of the IMS client that is held is only used for routing. Therefore, the increase in traffic cannot be improved by the technique described in the above document.

  The objective of this invention is providing the technique which solves the above-mentioned subject.

In order to achieve the above object, a system according to the present invention provides:
A communication network system including an IMS (IP Multimedia Subsystem) network,
A call session control function (CSCF) part;
A communication terminal located in the processing area of the call session control function unit;
With
Serving call session control function (S-CSCF) part of the call session control function part ,
Registration means the capability information of the communication terminal received from the serving area communication terminal is registered in association with the communication terminal,
Using the capability information registered in the registration unit, an alternative unit that performs a response to the inquiry of the capability information to the communication terminal via the call session control function unit instead of the communication terminal ;
Equipped with a,
The alternative means is
Request determination means for determining that an options request (OPTIONS REQUEST) for requesting capability information from the communication terminal located in the area has been received from an inquiry source of capability information;
If the request determination unit determines that the options request to the communication terminal in the area is received from the inquiry source, the options request is not transferred to the communication terminal in the area that is the inquiry destination. The normal response signal (200 OK) indicating a normal response from the inquired communication terminal with respect to the options request is generated instead of the inquired communication terminal, and is generated by the alternative To the normal response signal, add the capability information of the communication terminal of the inquiry destination registered in the registration means in association with the communication terminal of the inquiry destination, and to the inquiry source of the options request Response generating means for responding capability information in place of the contact communication terminal;
It is characterized by having.

In order to achieve the above object, the method according to the present invention comprises:
A traffic reduction method in a communication network system including an IMS (IP Multimedia Subsystem) network, wherein the communication network system includes a call session control function (CSCF) unit and a processing area of the call session control function unit A communication terminal located in the area,
The serving call session control function call session control function unit (S-CSCF: Serving call session control function) part, capability information of the communication terminal received from the serving area communication terminal, correspondence to the communication terminal A registration step for registering with the registration means,
The serving / call session control function unit of the call session control function unit uses the capability information registered in the registration means to send a response to the inquiry of capability information to the communication terminal via the call session control function unit. , An alternative step performed in place of the communication terminal;
Only including,
The alternative step is:
A determination step of determining that an options request (OPTIONS REQUEST) for requesting capability information from the communication terminal located in the area has been received from an inquiry source of capability information;
In the determination step, a normal response from the inquiry communication terminal to the options request without transferring the options request to the communication terminal located in the inquiry to the communication terminal located in the inquiry destination. A normal response signal (200 OK) indicating that the communication terminal of the inquiry is generated instead of the communication terminal of the inquiry destination, and the communication terminal of the inquiry destination is added to the registration means in the normal response signal generated by the replacement The capability information of the communication terminal of the inquiry destination registered in association with is added, and the capability information is returned to the inquiry source of the options request instead of the communication terminal of the inquiry destination. A response generation step;
The characterized by containing Mukoto.

In order to achieve the above object, an apparatus according to the present invention provides:
A communication control apparatus that performs a call session control function in a communication network system including an IMS (IP Multimedia Subsystem) network,
Registration means for registering the communication terminal capability information received from a communication terminal located in the processing area of the communication control device in association with the communication terminal;
Using the capability information registered in the registration unit, an alternative unit that performs a response to the inquiry of capability information to the communication terminal via the communication control device instead of the communication terminal;
Equipped with a,
The alternative means is
Request determination means for determining that an options request (OPTIONS REQUEST) for requesting capability information from the communication terminal located in the area has been received from an inquiry source of capability information;
If the request determination unit determines that the options request to the communication terminal in the area is received from the inquiry source, the options request is not transferred to the communication terminal in the area that is the inquiry destination. The normal response signal (200 OK) indicating a normal response from the inquired communication terminal with respect to the options request is generated instead of the inquired communication terminal, and is generated by the alternative To the normal response signal, add the capability information of the communication terminal of the inquiry destination registered in the registration means in association with the communication terminal of the inquiry destination, and to the inquiry source of the options request Response generating means for responding capability information in place of the contact communication terminal;
It is characterized by having.

In order to achieve the above object, the method according to the present invention comprises:
A control method of a communication control device that performs a call session control function in a communication network system including an IMS (IP Multimedia Subsystem) network,
A registration step of registering capability information of said communication terminal received from the communication terminals existing in the processing region of the communication control device, the registration means in association with the communication terminal,
Using the capability information registered in the registration means, an alternative step of performing a response to the inquiry of capability information to the communication terminal via the communication control device instead of the communication terminal;
Only including,
The alternative step is:
A determination step of determining that an options request (OPTIONS REQUEST) for requesting capability information from the communication terminal located in the area has been received from an inquiry source of capability information;
In the determination step, a normal response from the inquiry communication terminal to the options request without transferring the options request to the communication terminal located in the inquiry to the communication terminal located in the inquiry destination. A normal response signal (200 OK) indicating that the communication terminal of the inquiry is generated instead of the communication terminal of the inquiry destination, and the communication terminal of the inquiry destination is added to the registration means in the normal response signal generated by the replacement The capability information of the communication terminal of the inquiry destination registered in association with is added, and the capability information is returned to the inquiry source of the options request instead of the communication terminal of the inquiry destination. A response generation step;
The characterized by containing Mukoto.

In order to achieve the above object, a program according to the present invention provides:
A control program for a communication control device that performs a call session control function in a communication network system including an IMS (IP Multimedia Subsystem) network,
A registration step of registering capability information of said communication terminal received from the communication terminals existing in the processing region of the communication control device, the registration means in association with the communication terminal,
Using the capability information registered in the registration means, an alternative step of performing a response to the inquiry of capability information to the communication terminal via the communication control device instead of the communication terminal;
To the computer ,
The alternative step is:
A determination step of determining that an options request (OPTIONS REQUEST) for requesting capability information from the communication terminal located in the area has been received from an inquiry source of capability information;
In the determination step, a normal response from the inquiry communication terminal to the options request without transferring the options request to the communication terminal located in the inquiry to the communication terminal located in the inquiry destination. A normal response signal (200 OK) indicating that the communication terminal of the inquiry is generated instead of the communication terminal of the inquiry destination, and the communication terminal of the inquiry destination is added to the registration means in the normal response signal generated by the replacement The capability information of the communication terminal of the inquiry destination registered in association with is added, and the capability information is returned to the inquiry source of the options request instead of the communication terminal of the inquiry destination. A response generation step;
It is characterized by including .

  According to the present invention, traffic reduction can be achieved by terminating terminal capability exchange, which is normally exchanged between a communication terminal and a communication terminal, at the call session control function unit.

It is a block diagram which shows the structure of the communication network system which concerns on 1st Embodiment of this invention. It is a block diagram which shows the structure of the communication network system which concerns on 2nd Embodiment of this invention. It is a sequence diagram which shows the operation | movement procedure of registration and the inquiry of the terminal capability of the communication network system which concerns on 2nd Embodiment of this invention. It is a sequence diagram which shows the operation | movement procedure of the terminal capability inquiry of the communication network system which concerns on 2nd Embodiment of this invention. It is a figure which shows the structure of the registration request which concerns on 2nd Embodiment of this invention. It is a figure which shows the structure of the registration response which concerns on 2nd Embodiment of this invention. It is a figure which shows the structure of the terminal capability inquiry request which concerns on 2nd Embodiment of this invention. It is a figure which shows the structure of the terminal capability inquiry response which concerns on 2nd Embodiment of this invention. It is a block diagram which shows the function structure of the serving * call session control function (S-CSCF) part which concerns on 2nd Embodiment of this invention. It is a block diagram which shows the hardware constitutions of the serving * call session control function (S-CSCF) part which concerns on 2nd Embodiment of this invention. It is a figure which shows the structure of the terminal capability registration table which concerns on 2nd Embodiment of this invention. It is a flowchart which shows the process sequence of the serving and call session control function (S-CSCF) part which concerns on 2nd Embodiment of this invention. It is a flowchart which shows the process sequence of the registration (REGISTER) process which concerns on 2nd Embodiment of this invention. It is a flowchart which shows the process sequence of the terminal capability alternative response process with respect to the terminal capability inquiry (OPTIONS) which concerns on 2nd Embodiment of this invention. It is a block diagram which shows the function structure of the communication terminal which concerns on 2nd Embodiment of this invention. It is a block diagram which shows the hardware constitutions of the communication terminal which concerns on 2nd Embodiment of this invention. It is a flowchart which shows the process sequence of the communication terminal which concerns on 2nd Embodiment of this invention. It is a sequence diagram which shows the operation | movement procedure of registration and the inquiry of the terminal capability of the communication network system which concerns on 3rd Embodiment of this invention. It is a sequence diagram which shows the operation | movement procedure of registration and the inquiry of the terminal capability of the communication network system which concerns on 4th Embodiment of this invention. It is a block diagram which shows the structure of the communication network system which concerns on 5th Embodiment of this invention. It is a sequence diagram which shows the operation | movement procedure of registration and the inquiry of the terminal capability of the communication network system which concerns on 5th Embodiment of this invention.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the constituent elements described in the following embodiments are merely examples, and are not intended to limit the technical scope of the present invention only to them.

[First Embodiment]
A communication network system 100 as a first embodiment of the present invention will be described with reference to FIG. The communication network system 100 is a system including an IMS (IP Multimedia Subsystem) network 101.

  As shown in FIG. 1, the communication network system 100 includes a call session control function (CSCF) unit 110 and communication terminals 121 to 123 located in the processing area of the call session control function unit 110. Including. Then, the call session control function unit 110 uses the registration unit 111 that registers the capability information of the communication terminals 121 to 123 in association with the communication terminals 121 to 123, and the capability information registered in the registration unit 111. And an alternative unit 112 that performs a response to the inquiry of capability information to the communication terminals 121 to 123 via the control function unit 110 instead of the communication terminals 121 to 123.

  According to this embodiment, it is possible to reduce traffic by terminating the terminal capability exchange that is normally exchanged between the communication terminal and the communication terminal at the call session control function unit.

[Second Embodiment]
Next, a communication network system according to the second embodiment of the present invention will be described. First, an outline of the present embodiment is shown.

<< Outline of this embodiment >>
In an IMS network that provides multimedia services such as VoIP, GSMA RCS (R1-4), RCS-e (v1.1) (Global It is defined in standard recommendations such as the System for Mobile communications Association (Revision Control System). Such a signal may be transmitted / received to / from all communication terminals described in the telephone directory of the communication terminal, and it is assumed that the increase in traffic affects the VoIP service.

  In the present embodiment, it is possible to reduce traffic in the IMS network by terminating a signal distributed between communication terminals at a network node when performing capability exchange between the communication terminals. For example, according to 3GPP (Third Generation Partnership Project) TS24.229 (v11.00), S-CSCF (Serving call session control function) _A is transmitted from the communication terminal at the time of registration (REGISTER) of the communication terminal UE (User Equipment) _A. The capability information indicating the capability of the assigned communication terminal is held. The S-CSCF_A that has received the capability exchange signal from the communication terminal UA_B normally transmits the signal to the communication terminal UA-A. However, in the present embodiment, the capability exchange signal is terminated with S-CSC_A, and the capability information of the communication terminal UA_A acquired and held at the time of REGISTER is transmitted as a response signal to the communication terminal UA_B.

  According to the present embodiment, it is possible to reduce the request signal sent to the communication terminal UA_A via the called-side S-CSCF_A and the response signal from the communication terminal UA_A to the S-CSCF at the time of capability exchange. Become.

<Configuration of communication network system>
FIG. 2 is a block diagram showing a configuration of the communication network system 200 according to the present embodiment. In the present embodiment, the case where a multimedia service such as VoIP is realized by the IMS network 201 is targeted.

  In FIG. 2, a CSCF (call session control function) that performs session control for two service areas is arranged in the IMS network 201. CSCF (call session control function) includes I-CSCF and P-CSCF in addition to the S-CSCF. Also, the HSS is connected. The functional outline of each functional component is as follows (see 3GPP TS29.228).

  The S-CSCF is a serving call session control function that performs session control. Call control is performed based on the subscriber information acquired from the HSS. It is a SIP (Session Initiation Protocol) session control server that performs location registration (including authentication), routing, and service control.

  The P-CSCF is a proxy call session control function accessed by the communication terminal. It is a session control server that transfers a SIP signal to the S-CSCF as an access point from a communication terminal.

  The I-CSCF is an interogating call session control function having a gateway function with other networks. It has an interface with another IP network, performs routing to the S-CSCF for incoming calls, and conceals the network topology when connected to other networks.

  The HSS is a home subscriber server (HSS) that registers subscribers whose service area is home. Authentication information, service information, and routing information are provided using stored subscriber data.

  In FIG. 2, P-CSCF_A (210-A), S-CSCF_A (220-A), I-CSCF_A (230-A), and HSS_A (240-A) are respectively provided to provide services to two service areas. And a set of P-CSCF_A (210-A), S-CSCF_A (220-A), I-CSCF_A (230-A), and HSS_A (240-A). Note that the number of service areas is two in order to simplify the description and is not limited to two.

  Communication terminals 251 to 253 located in this service area are connected to the P-CSCF_A (210-A) via the IP core network 202-A. Communication terminals 261 to 263 located in this service area are connected to the P-CSCF_B (210-B) via the IP core network 202-B. Among these, the communication terminals 251 and 252 communicate within the service area via the P-CSCF_A (210-A) and the S-CSCF_A (220-A). Communication terminals 262 and 263 communicate with each other in the service area via P-CSCF_B (210-B) and S-CSCF_B (220-B). On the other hand, the communication terminals 253 and 261 pass through the P-CSCF_A (210-A), S-CSCF_A (220-A), S-CSCF_B (220-B), and P-CSCF_B (210-B). Communication between service areas is performed.

<< Operation procedure of communication network system >>
FIG. 3A is a sequence diagram showing a terminal capability registration and inquiry operation procedure 301 of the communication network system 200 according to the present embodiment. In FIG. 3A, the operations of the I-CSCF and the HSS are deleted in order to avoid complicated explanation.

  First, in step S311, UE_A requests registration of UE_A and its capability information to S-CSCF_A via P-CSCF_A by SIP signal registration request (SIP_REGISTER) at the time of location registration (see FIG. 4A). ). In step S311, the S-CSCF_A that has received the registration request holds the capability information of the received UE_A in association with the UE_A while executing the registration process of the UE_A (see FIG. 8). In step S315, UE_A is notified of the result of registration of UE_A and its capability information. FIG. 3A shows 200_OK (hereinafter referred to as “200 OK” in the specification and drawings) which is a normal registration response (see FIG. 4B). For details of the request and response SIP signals, refer to RFC (Request for Comments) 3261, which is a technical specification by IETF (Internet Engineering Task Force).

  Thereafter, at a predetermined timing, a capability inquiry request (one of SIP_OPTIONS) for inquiring the UE capability of UE_A is transmitted from UE_B to service area A side via P-CSCF_B and S-CSCF_B (FIG. 5A). reference). The S-CSCF_A that has received the capability inquiry request terminates the capability inquiry request instead of transparently transferring it to UE_A in step S319. In step S321, the UE_A capability information held in step S313 is added to the normal response signal SIP_200OK. In step S323, SIP_200OK to which the capability information of UE_A is assigned is returned to UE_B via S-CSCF_B and P-CSCF_B.

  FIG. 3B is a sequence diagram showing an operation procedure 302 of the terminal capability inquiry of the communication network system 200 according to the present embodiment. FIG. 3B shows several examples of when the communication terminal UE_B inquires about the communication terminal capability of another device (UE_A in this embodiment). Therefore, in FIG. 3B, the process of UE_A is simplified, and is the same as FIG. Also, the processing of S-CSCF_A is simplified because it is the same as FIG. 3A.

  First, the first timing is the timing of powering on UE_B. In step S331, UE_B is powered on. In step S333, UE_B refers to the phone book registered in the own device and inquires the terminal capability of the other device. As part of this, an inquiry to UE_A is made by a SIP_OPTIONS request. This SIP_OPTIONS request is terminated with S-CSCF_A, and the held capability information of UE_A is added to normal response signal SIP_200OK, and is returned to UE_B in step S335.

  Next, the second timing is a timing at every elapse of a predetermined time set in UE_B. In step S337, UE_B monitors the passage of a predetermined time. The predetermined elapsed time is not limited. It changes according to the traffic situation of the communication line. When the predetermined time has elapsed, in step S339, the terminal capability of another machine is inquired. As part of this, an inquiry to UE_A is made by a SIP_OPTIONS request. This SIP_OPTIONS request is terminated by S-CSCF_A, and the held capability information of UE_A is added to normal response signal SIP_200OK, and is returned to UE_B in step S341. If the predetermined time has not elapsed, the process proceeds to the process at the time of capability change after step S343.

  Furthermore, the third timing is a timing when the capability is changed by adding or updating an application in UE_B. In step S343, the UE_B capability change is monitored. If there is a capability change, the changed capability information is registered in S-CSCF_B in steps S343 and S345. In step S347, the terminal capability inquiry of the other device is performed. As part of this, an inquiry to UE_A is made by a SIP_OPTIONS request. This SIP_OPTIONS request is terminated at S-CSCF_A, and the held capability information of UE_A is added to normal response signal SIP_200OK, and is returned to UE_B in step S347. When there is no capability change or when the change process is completed, the process returns to step S337 and the process is repeated.

  Note that the timing for inquiring about the communication terminal capability of another device is not limited to the above example. The termination and response substitution by the S-CSCF_A of this embodiment are effective at any timing.

《Register message》
In the following, according to FIG. 4A and FIG. 4B, the structure of a message in terminal registration (REGISTER) processing is shown.

(Registration request)
FIG. 4A is a diagram showing a configuration of the registration request 410 according to the present embodiment. Only the portion related to the present embodiment will be described. For others, refer to RFC 3261, which is a technical specification by IETF.

  FIG. 4A shows a registration request (REGISTER) for a Taro communication terminal located in the Tokyo area corresponding to UE_A in FIG. 3A to register its own device in the S-CSCF_A in the Tokyo area. It is a format example. Here, capability information of the communication terminal is added to 411.

  In the example of FIG. 4A, as the capability information, a request that can be responded (Allow), an application that can respond (Accept), a decodable encoding (Accept-Encoding), and an available language (Accept-Language) are supported. Variable (Supported) is described. Furthermore, correspondence to SDP (service delivery platform) may be described.

  Note that the capability information of the communication terminal is not limited to FIG. 4A. For example, ITU H.264. Capability exchange information in H.245 may also be included. For example, multiplexing capability (MultiplexCapability), video encoding capability (VideoCapability), audio encoding capability (AudioCapability), various data transfer protocols (DataApplicationCapability), security / encryption capability (EncryptionCapability), user input message capability (UserInputCapability), etc. Is included.

(Registration response)
FIG. 4B is a diagram showing a configuration of the registration response 420 according to the present embodiment. Only the portion related to the present embodiment will be described. For others, refer to RFC 3261, which is a technical specification by IETF.

  FIG. 4B is a 200_OK format indicating that the registration process of UE_A's location and capability information has been successfully completed in S-CSCF_A.

《Terminal capability inquiry message》
Next, the structure of a message in the terminal capability inquiry (OPTIONS) process is shown.

(Terminal capability inquiry request)
FIG. 5A is a diagram showing a configuration of a terminal capability inquiry request 510 according to the present embodiment. Only the portion related to the present embodiment will be described. For others, refer to RFC 3261, which is a technical specification by IETF.

    FIG. 5A shows options for Hanako's communication terminal located in the Osaka area corresponding to UE_B in FIG. 3A to inquire about the capabilities of Taro's communication terminal UE_A in the Tokyo area. It is a format example of a request (OPTIONS).

(Terminal capability inquiry response)
FIG. 5B is a diagram showing a configuration of the terminal capability inquiry response 520 according to the present embodiment. Only the portion related to the present embodiment will be described. For others, refer to RFC 3261, which is a technical specification by IETF.

  FIG. 5B shows a 200_OK format in which the OPTIONS request of FIG. 5A is terminated with S-CSCF_A, capability information of UE_A is added with S-CSCF_A, and an alternative response is made. Here, capability information of the communication terminal is added to 521. Since the capability information 521 is the same as the capability information 411 of FIG. 4A, description thereof is omitted.

  As described in FIG. 4A, the capability information of the communication terminal is not limited to FIG. 4A. For example, ITU H.264. Capability exchange information in H.245 may also be included.

<< Configuration of S-CSCF >>
In this embodiment, the configuration of the S-CSCF, which is a communication control device that terminates the terminal capability inquiry to the communication terminal and responds instead of the communication terminal, will be described (functional configuration).
FIG. 6 is a block diagram showing a functional configuration of the serving / call session control function (S-CSCF) unit 210 according to the present embodiment. In FIG. 6, S-SCSF_A will be described as a representative, but S-SCSF_B is the same.

  The S-SCSF_A (210-A) includes a terminal-side communication control unit 611 that controls communication with the communication terminals 251 to 153 via the P-CSCF_A (220-A). Moreover, in this embodiment, it has the network side communication control part 612 which controls communication with S-CSCF_B in another service area. Moreover, it has the communication information communication control part 613 which controls communication with I-SCSF_A (230-A) and HSS_A (240-A).

  Further, it has a request determination unit 614 that determines the type of the SIP request received via the terminal side communication control unit 611 or the network side communication control unit 612. If it is determined by the request determination unit 614 that the SIP request is an INVITE request that requires processing for starting a transaction, the session control unit 615 starts a session. In the present embodiment, since the INVITE request has little relation, detailed description is omitted.

  If it is determined by the request determination unit 614 that the SIP request is a REGISTER request, the SIP registration control unit 618 registers the requesting communication terminal in the registration unit 619 as a serving terminal. At the same time, the capability information registration control unit 616 registers the capability information included in the REGISTER request in the registration unit 619 in association with the requesting communication terminal. Then, the response generation unit 617 returns the processing result as a response message to the requesting communication terminal.

  If it is determined by the request determination unit 614 that the SIP request is determined as an OPTIONS request as a terminal capability query, the response generation unit 617 adds the information registered in the registration unit 619 to the response message (200 OK) and sends the request source Reply to the communication terminal.

  Note that the functional configuration unit of S-CSCF_A in FIG. 6 is an example, and the present invention is not limited to this.

(Hardware configuration)
FIG. 7 is a block diagram showing a hardware configuration of the serving / call session control function (S-CSCF) unit 210 according to the present embodiment. FIG. 7 shows a configuration related to the present embodiment, and a configuration with little relation is deleted.

  In FIG. 7, a CPU 710 is a processor for arithmetic control, and implements each functional component of S-CSCF_A (210-A) and S-CSCF_B (210-B) of FIG. 6 by executing a program. The ROM 720 stores initial data and fixed data such as programs and programs. The communication control units 611 to 613 are the communication control units illustrated in FIG. As shown in FIG. 7, it may be configured by one communication control unit.

  The RAM 740 is a random access memory that the CPU 710 uses as a work area for temporary storage. In the RAM 740, an area for storing data necessary for realizing the present embodiment is secured. 741 is the received SIP request message. Reference numeral 742 denotes the determined request type. Reference numeral 743 denotes a request source terminal ID and terminal capability information to be registered, which are included in the REGISTER request. 744 is a response message for responding to the received SIP request message. 745 is terminal capability information that responds with the terminal ID of the request source (response destination) described in the response message that responds to the OPTIONS request.

  The storage 750 stores a database, various parameters, or the following data or programs necessary for realizing the present embodiment. Reference numeral 619a denotes a SIP registration unit. Reference numeral 619b denotes a terminal capability registration unit that registers terminal capability information in association with the communication terminal ID. 619a and 619b are included in the registration unit 619 in FIG. 751 is a message format used to determine a request message and to generate a response message.

  The storage 750 stores the following programs. 752 stores a communication control program for controlling the entire S-CSCF_A (210-A) and S-CSCF_B (210-B). 753 stores a request determination module for determining a SIP request in the communication control program 752. 754 stores a response generation module that generates a response in response to the SIP request in the communication control program 752. A terminal capability registration module 755 registers the terminal capability included in the REGISTER request in the communication control program 752.

  FIG. 7 shows only data and programs essential to the present embodiment, and does not illustrate data and programs not related to the present embodiment.

(Terminal capability registration table)
FIG. 8 is a diagram showing a configuration of the terminal capability registration table 619b according to the present embodiment. Note that the configuration of the terminal capability registration table 619b is not limited to FIG.

  The terminal capability registration table 619b in FIG. 8 is associated with the communication terminal ID 801, the request (Allow) 802 that can respond, the application (Accept) 803 that can respond, and the encoding that can be decoded, as described above with reference to FIGS. 4A and 5B. (Accept-Encoding) 804, available language (Accept-Language) 805, supported variables (Supported) 806, and SDP correspondence 807 are stored.

  As described in FIGS. 4A and 5B, the capability information of the communication terminal is not limited to FIG. 4A. For example, ITU H.264. Capability exchange information in H.245 may also be included.

<< S-CSCF processing procedure >>
FIG. 9 is a flowchart showing a processing procedure of the serving / call session control function (S-CSCF) unit according to the present embodiment. This flowchart is executed by the CPU 710 in FIG. 7 while using the RAM 740, and implements each functional component in FIG.

  First, in step S911, it is determined whether or not the reception is from the communication terminal via the P-CSCF. In step S921, it is determined whether the reception is from the network side or another S-CSCF. If it is neither, other processing is performed in step S931.

  If it is reception from a communication terminal, it will progress to step S913 and it will be determined whether it is a registration (REGISTER) request | requirement. If it is a registration (REGISTER) request, the process proceeds to step S915 to perform registration (REGISTER) processing (see FIG. 10A). If it is not a registration (REGISTER) request, the process proceeds to step S917 to perform other request processing.

  If it is reception from the network side or another S-CSCF, the process proceeds to step S923 to determine whether it is an OPTIONS request. If the request is an OPTIONS request, the process proceeds to step S925, and the terminal capability alternative response process is performed on behalf of the communication terminal (FIG. 10B). If it is not a registration (REGISTER) request, or if it is not an inquiry about terminal capabilities, other request processing is performed in step S927.

(Registration process: REGISTER)
FIG. 10A is a flowchart showing a processing procedure of registration (REGISTER) processing S915 according to the present embodiment.

  First, in step S1011, the terminal ID of the requesting communication terminal is acquired and registered in the SIP registration unit 619a. Subsequently, in step S1013, a user ID is acquired and registered. Next, in step S1015, current position information is acquired and held.

  In step S1017, it is determined whether capability information is included in the REGISTER message. If the capability information is included, the process proceeds to step S1019, where the capability information is acquired and registered in the terminal capability registration table 619b. Next, in step S1021, it is determined whether the registration process has been normally completed. If it is normal completion, the process proceeds to step S1023, and a response (200 OK) is returned to the communication terminal that is the REGISTER request source. On the other hand, if it is not completed normally, the process proceeds to step S1025, and an error response is sent to the REGISTER request source communication terminal.

(Inquiry processing: OPTIONS)
FIG. 10B is a flowchart showing a processing procedure of terminal capability substitution response processing S925 for terminal capability inquiry (OPTIONS) according to the present embodiment.

  First, in step S1031, the terminal ID of the communication terminal that has made the OPTIONS request is acquired. In step S1033, it is determined whether capability information of the acquired terminal ID is registered. If the capability information is registered, the process proceeds to step S1035, and a message for responding to the terminal capability is generated (see FIG. 5B). In step S1037, a response (200 OK) including the terminal capability of the inquiry destination is returned to the inquiry communication terminal. On the other hand, if the capability information is not registered in the determination in step S1033, the process proceeds to step S1039 and is transferred to the destination communication terminal of the OPTIONS request via the P-CSCF.

<Configuration of communication terminal>
The configuration of the communication terminal in this embodiment will be described (functional configuration).
FIG. 11A is a block diagram illustrating a functional configuration of the communication terminals 251 to 253 and 261 to 263 according to the present embodiment.

  The communication terminals 251 to 253 and 261 to 263 include a communication control unit 1101 that controls communication with the P-CSCF_A / B (220-A / B). In addition, a request determination unit 1102 that determines the type of the SIP request received via the communication control unit 1101 is provided. It has a response generation unit 1103 that generates a response corresponding to the request determined by the request determination unit 1102. For example, if it is a terminal capability inquiry with an OPTIONS request, the capability information of the own device registered in the registration 1107 unit is returned under the control of the capability information registration control unit 1106.

  In addition, a request generation unit 1104 that generates a SIP request to be transmitted via the communication control unit 1101 is provided. When the SIP request generated here is a REGISTER request of the present embodiment, the information is transmitted with the capability information of the own device registered in the registration 1107 part added. Further, it has a response determination unit 1105 that determines the type of response received via the communication control unit 1101. If the SIP request generated by the request generation unit 1104 is a terminal capability inquiry of another device of the OPTINS request of this embodiment, if the response is 200 OK and the response includes the terminal capability information of the other device, the capability information Under the control of the registration control unit 1106, registration is performed in the registration 1107 unit in association with the terminal ID of the other device.

  The input / output interface 1170 interfaces input / output data with input / output devices. A display unit 1171, a touch panel 1172, a keyboard 1173, a speaker 1174, a microphone 1175, and a pointing device 1176 are connected to the input / output interface 1170. The input / output device is not limited to the above example.

  In addition, the function structure part of the communication terminal of FIG. 11A is the example, Comprising: It is not limited to this.

(Hardware configuration)
FIG. 11B is a block diagram illustrating a hardware configuration of the communication terminals 251 to 253 and 261 to 263 according to the present embodiment.

  In FIG. 11B, a CPU 1110 is a processor for arithmetic control, and implements each functional component of the communication terminal by executing a program. The ROM 1120 stores fixed data and programs such as initial data and programs. Further, the communication control unit 1130 is a communication control unit, and communicates with the P-CSCF in the present embodiment.

  The RAM 1140 is a random access memory used by the CPU 1110 as a work area for temporary storage. The RAM 1140 has an area for storing data necessary for realizing the present embodiment. Reference numeral 1141 denotes the terminal ID and user ID of the own device. Reference numeral 1142 denotes current position information. Reference numeral 1143 denotes the received request message. Reference numeral 1144 denotes a response message to be transmitted. Reference numeral 1145 denotes a request message to be transmitted, which stores a registration (REGISTER) request 1145a for registering own functional capability information, an OPTIONS request 1145b for inquiring other functional capabilities, and the like. Reference numeral 1146 denotes the received response message. In the present embodiment, the 200OK message includes the capability information of the other device.

  The storage 1150 stores a database, various parameters, or the following data or programs necessary for realizing the present embodiment. Reference numeral 1151 denotes a telephone directory DB that registers telephone numbers and mail addresses in association with communication destinations. 1152 is capability information of the own device. Reference numeral 1153 denotes an other functional information table that stores the capability information of the other device returned from the other device in response to the inquiry in correspondence with the terminal ID of the other device. A message format 1154 is used to determine a request message and to generate a response message.

  The storage 1150 stores the following programs. 1155 stores a communication control program for controlling the entire communication terminal UE. 1156 stores a capability information registration module for registering the capability information of the own device in the S-CSCF in the communication control program 1155. 1157 stores a capability information inquiry module for inquiring capability information of other devices in the communication control program 1155.

  A GPS (Global Positioning System) current position acquisition unit 1160 acquires a current position based on a signal from a GPS satellite. The input / output interface 1170 and the connected input / output devices 1171 to 1176 are the same as those in FIG.

  In FIG. 11B, only data and programs essential to the present embodiment are shown, and data and programs not related to the present embodiment are not shown.

<< Processing procedure of communication terminal >>
FIG. 12 is a flowchart showing a processing procedure of the communication terminal according to the present embodiment. This flowchart is executed by the CPU 1110 of FIG. 11B while using the RAM 1140, and implements each functional component of the communication terminal. Note that FIG. 12 does not show small processes directly related to the present embodiment.

  First, in step S1211, it is determined whether the power is on. In step S1221, it is determined whether the capability of the own device is changed. In step S1231, it is determined whether or not there is a change in area. In step S1241, it is determined whether a predetermined time has elapsed. If none of the determinations is met, other processing is performed in step S1251.

  If the power is on, if the own function is changed, or if the area of service is changed, the capability information of the own device is registered in the S-CSCF in step S1213. Subsequently, in step S1215, an inquiry is made about the capability information of the other device registered in the telephone directory. The returned capability information of the other device is held in association with the terminal ID. If the predetermined time has elapsed, steps S1215 and S1217 are executed.

[Third Embodiment]
Next, a communication network system according to the third embodiment of the present invention will be described. The communication network system according to the present embodiment is different from the second embodiment in that it is not a communication terminal capability inquiry between different service areas, but a communication terminal capability inquiry within the same service area. Since other configurations and operations are the same as those of the second embodiment, detailed description thereof is omitted.

  According to the present embodiment, the request signal of the communication terminal UA_A2 sent from the S-CSCF_A to the communication terminal UA_A1 via the P-CSCF_A and the response signal from the communication terminal UA_A1 to the S-CSCF_A at the time of capability exchange. It becomes possible to reduce.

<< Operation procedure for registration and inquiry of terminal capabilities of communication network system >>
FIG. 13 is a sequence diagram showing an operation procedure 1300 for registering and querying terminal capabilities of the communication network system according to the present embodiment. Note that steps S311 to S315 are the same as FIG. 3A except that UE_A is set to UE_A1, and thus the description thereof is omitted.

  In steps S1311 to S1315, the capability information of UE_A2 is held in S-CSCF_A in the same sequence as steps S311 to S315.

  In step S1317, UE_A2 inquires about the communication terminal capability of UE_A1 through an OPTIONS request. The S-CSCF_A terminates this inquiry in step S1319. In step S1321, UE_A1 capability information held in step S313 is added to the response 200OK, and in step S1323, the UE_A1 is returned to UE_A2 instead of UE_A1.

[Fourth Embodiment]
Next, a communication network system according to the fourth embodiment of the present invention will be described. The communication network system according to the present embodiment differs from the second embodiment in that terminal capability registration is performed by a request from the S-CSCF. Since other configurations and operations are the same as those of the second embodiment, detailed description thereof is omitted.

  According to the present embodiment, it is possible to substitute the terminal capability response only by adding the function (uplication) of the S-CSCF without changing the function (uplication) of the communication terminal at all.

<< Operation procedure for registration and inquiry of terminal capabilities of communication network system >>
FIG. 14 is a sequence diagram showing an operation procedure 1400 for registration and inquiry of terminal capabilities of the communication network system according to the present embodiment.

  First, in step S1411, a REGISTER request not provided with conventional capability information is transmitted from UE_A to S-CSCF_A. In S-CSCF_A, only registration of UE_A is performed in step S1413. In step S1415, the S-CSCF_A notifies the UE_A of the completion of registration of the UE_A by 200OK. Furthermore, S-CSCF_A inquires about the communication terminal capability of UE_A by an OPTIONS request in step S1417. In step S1419, the capability information given to the response 200OK from UE_A is acquired, and in step S1421, it is stored in association with the terminal ID of UE_A.

  Hereinafter, steps S317 to S323 are the same as those in FIG. 3A of the second embodiment, and a description thereof will be omitted.

[Fifth Embodiment]
Next, a communication network system according to a fifth embodiment of the present invention will be described. The communication network system according to the present embodiment is different from the second embodiment in that the source for inquiring about the terminal capability is an application server (AP). Since other configurations and operations are the same as those of the second embodiment, the same configurations and operations are denoted by the same reference numerals, and detailed description thereof is omitted.

  According to this embodiment, in addition to the capability information query between communication terminals, a terminal capability response can be substituted for a terminal capability query from the application server.

<Configuration of communication network system>
FIG. 15 is a block diagram illustrating a configuration of a communication network system 1500 according to the present embodiment. In FIG. 15, the same reference numerals are assigned to the same functional elements as those in FIG. 2 of the second embodiment, and the description thereof is omitted.

  15 differs from FIG. 2 in that AP_A (1501-A) and AP_B (1501-B) are added. The AP services various applications to the communication terminal via the IMS network. FIG. 15 shows a state in which AP_A (1501-A) and AP_B (1501-B) are serving the communication terminal 253. For this reason, communication between the communication terminal 253 and the communication terminal 261 is released.

<< Operation procedure for registration and inquiry of terminal capabilities of communication network system >>
FIG. 16 is a sequence diagram showing an operation procedure 1600 for registering and querying terminal capabilities of the communication network system 1500 according to the present embodiment. Steps S311 to S315 are the same as those in FIG.

  In step S1621, the capability inquiry of the communication terminal UE_A is received from the AS-A by the OPTINS request. The S-CSCF_A that has received the capability inquiry request terminates the capability inquiry request instead of transparently transferring it to UE_A in step S1623. In step S1625, the UE_A capability information held in step S313 is added to the normal response signal SIP_200OK. In step S1627, SIP_200OK to which UE_A capability information is assigned is returned to AS_A via S-CSCF_B and P-CSCF_B.

  In step S1631, the capability inquiry of the communication terminal UE_A is received from the AS-B by the OPTINS request. In step S1633, the S-CSCF_A that has received the capability inquiry request terminates the capability inquiry request instead of transparently transferring it to the UE_A. In step S1635, the UE_A capability information held in step S313 is added to the normal response signal SIP_200OK. In step S1637, SIP_200OK to which the capability information of UE_A is attached is returned to AS_B via S-CSCF_B and P-CSCF_B.

[Other Embodiments]
The substitution of the capability information response of the communication terminal may be performed by P-CSCF, I-CSCF, HSS, or the like. However, it is desirable to substitute the terminal capability response with the S-CSCF that is a transfer route of the request and manages the communication terminal and functions as the SIP registration server.

  Although the present invention has been described with reference to the embodiments, the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention. In addition, a system or an apparatus in which different features included in each embodiment are combined in any way is also included in the scope of the present invention.

  In addition, the present invention may be applied to a system composed of a plurality of devices, or may be applied to a single device. Furthermore, the present invention can also be applied to a case where an information processing program that implements the functions of the embodiments is supplied directly or remotely to a system or apparatus. Therefore, in order to realize the functions of the present invention on a computer, a control program installed in the computer, a medium storing the control program, and a WWW (World Wide Web) server that downloads the control program are also included in the scope of the present invention. include.

[Other expressions of embodiment]
A part or all of the above-described embodiment can be described as in the following supplementary notes, but is not limited thereto.
(Appendix 1)
A communication network system including an IMS (IP Multimedia Subsystem) network,
A call session control function (CSCF) part;
A communication terminal located in the processing area of the call session control function unit;
With
The call session control function unit
Registration means for registering the capability information of the communication terminal in association with the communication terminal;
Alternative means for using the capability information registered in the registration means to perform a response to the inquiry of capability information to the terminal of the communication end via the call session control function unit instead of the communication terminal;
A communication network system comprising:
(Appendix 2)
The call session control function unit
A proxy call session control function (P-CSCF) unit accessed by the communication terminal;
An interrogating session control function (I-CSCF) unit having a gateway function with another network;
Serving call session control function (S-CSCF) section for performing session control;
Including
The communication network system according to appendix 1, wherein the serving / call session control function unit includes the registration unit and the alternative unit.
(Appendix 3)
The alternative means includes a determination means for determining a request for capability information to the communication terminal by an OPTIONS REQUEST,
Supplementary note 1 or 2 wherein when the determination unit determines that the request is for a capability information to the communication terminal, a response to the inquiry about the capability information of the communication terminal is performed instead of the communication terminal. The communication network system described in 1.
(Appendix 4)
The registration unit registers the capability information of the communication terminal in association with the communication terminal based on a registration request (REGISTER REQUEST) from the communication terminal. The communication network system described in 1.
(Appendix 5)
The communication terminal capability information includes at least a request that can be responded, a respondable application, a decodable encoding, an available language, a supported variable, and a service delivery platform (SDP). The communication network system according to any one of appendices 1 to 4, wherein the communication network system includes correspondence.
(Appendix 6)
A traffic reduction method in a communication network system including an IMS (IP Multimedia Subsystem) network, wherein the communication network system includes a call session control function (CSCF) unit and a processing area of the call session control function unit A communication terminal located in the area,
A registration step in which the call session control function unit registers the capability information of the communication terminal in the registration unit in association with the communication terminal;
Using the capability information registered in the registration means, the call session control function unit substitutes the communication terminal for a response to the inquiry of capability information to the communication terminal via the call session control function unit. An alternative step to perform,
A method of reducing traffic in a communication network system, comprising:
(Appendix 7)
A communication control apparatus that performs a call session control function in a communication network system including an IMS (IP Multimedia Subsystem) network,
Registration means for registering the communication terminal capability information in association with the communication terminal;
Using the capability information registered in the registration unit, an alternative unit that performs a response to the inquiry of capability information to the communication terminal via the communication control device instead of the communication terminal;
A communication control device comprising:
(Appendix 8)
A control method of a communication control device that performs a call session control function in a communication network system including an IMS (IP Multimedia Subsystem) network,
A registration step of registering the capability information of the communication terminal in the registration means in association with the communication terminal;
Using the capability information registered in the registration means, an alternative step of performing a response to the inquiry of capability information to the communication terminal via the communication control device instead of the communication terminal;
A control method for a communication control device, comprising:
(Appendix 9)
A control program for a communication control device that performs a call session control function in a communication network system including an IMS (IP Multimedia Subsystem) network,
A registration step of registering the capability information of the communication terminal in the registration means in association with the communication terminal;
Using the capability information registered in the registration means, an alternative step of performing a response to the inquiry of capability information to the communication terminal via the communication control device instead of the communication terminal;
A control program for causing a computer to execute.
(Appendix 10)
A communication terminal connected to a communication network system including an IMS (IP Multimedia Subsystem) network via a call session control function (CSCF) unit,
An additional means for adding capability information of the communication terminal to a registration request (REGISTER REQUEST) message at the time of location registration,
Transmitting means for transmitting the registration request to which the capability information of the communication terminal is added to the call session control function unit;
A communication terminal comprising:
(Appendix 11)
A method for controlling a communication terminal connected to a communication network system including an IMS (IP Multimedia Subsystem) network via a call session control function (CSCF) unit,
An additional step of adding capability information of the communication terminal to a registration request (REGISTER REQUEST) message at the time of location registration,
Transmitting the registration request to which the capability information of the communication terminal is added to the call session control function unit;
A control method for a communication terminal, comprising:
(Appendix 12)
A control program for a communication terminal connected to a communication network system including an IMS (IP Multimedia Subsystem) network via a call session control function (CSCF) unit,
An additional step of adding capability information of the communication terminal to a registration request (REGISTER REQUEST) message at the time of location registration,
Transmitting the registration request to which the capability information of the communication terminal is added to the call session control function unit;
A control program for causing a computer to execute.

Claims (9)

A communication network system including an IMS (IP Multimedia Subsystem) network,
A call session control function (CSCF) part;
A communication terminal located in the processing area of the call session control function unit;
With
Serving call session control function (S-CSCF) part of the call session control function part,
Registration means for registering the capability information of the communication terminal received from the located communication terminal in association with the communication terminal;
Using the capability information registered in the registration unit, an alternative unit that performs a response to the inquiry of the capability information to the communication terminal via the call session control function unit instead of the communication terminal;
With
The alternative means is
Request determination means for determining that an options request (OPTIONS REQUEST) for requesting capability information from the communication terminal located in the area has been received from an inquiry source of capability information;
If the request determination unit determines that the options request to the communication terminal in the area is received from the inquiry source, the options request is not transferred to the communication terminal in the area that is the inquiry destination. The normal response signal (200 OK) indicating a normal response from the inquired communication terminal with respect to the options request is generated instead of the inquired communication terminal, and is generated by the alternative To the normal response signal, add the capability information of the communication terminal of the inquiry destination registered in the registration means in association with the communication terminal of the inquiry destination, and to the inquiry source of the options request Response generating means for responding capability information in place of the contact communication terminal;
A communication network system comprising: The alternative means further comprises registration determination means for determining whether or not the registration means has registered the capability information of the communication terminal as the inquiry destination,
When the response generation unit determines that the request determination unit has received the options request to the communication terminal located in the area from the inquiry source, the registration determination unit determines the capability information of the communication terminal of the inquiry destination. The options request is transferred to the inquired communication terminal as it is, and the registration determining means determines that the capability information of the inquired communication terminal is registered, The communication network system according to claim 1, wherein capability information is returned to the inquiry source of the options request instead of the communication terminal of the inquiry destination.   The registration unit extracts capability information of the communication terminal added to a registration request (REGISTER REQUEST) for registering the communication terminal received from the communication terminal, and associates the extracted capability information with the communication terminal. The communication network system according to claim 1, wherein the communication network system is registered.   The inquiry source of the options request includes a communication terminal located in the processing area of the call session control function unit, an application server (AS) located in the processing area of the call session control function unit, and other service areas. 4. A communication terminal located in a processing area of a call session control function unit, and an application server (AS) located in a processing area of a call session control function unit of the other service area. The communication network system according to any one of the above.   The communication terminal capability information includes at least a request that can be responded, a respondable application, a decodable encoding, an available language, a supported variable, and a service delivery platform (SDP). The communication network system according to any one of claims 1 to 4, further comprising: a correspondence. A traffic reduction method in a communication network system including an IMS (IP Multimedia Subsystem) network, wherein the communication network system includes a call session control function (CSCF) unit and a processing area of the call session control function unit A communication terminal located in the area,
A serving call session control function (S-CSCF) unit of the call session control function unit associates the capability information of the communication terminal received from the located communication terminal with the communication terminal. A registration step for registering with the registration means,
The serving / call session control function unit of the call session control function unit uses the capability information registered in the registration means to send a response to the inquiry of capability information to the communication terminal via the call session control function unit. , An alternative step performed in place of the communication terminal;
Including
The alternative step is:
A determination step of determining that an options request (OPTIONS REQUEST) for requesting capability information from the communication terminal located in the area has been received from an inquiry source of capability information;
In the determination step, a normal response from the inquiry communication terminal to the options request without transferring the options request to the communication terminal located in the inquiry to the communication terminal located in the inquiry destination. A normal response signal (200 OK) indicating that the communication terminal of the inquiry is generated instead of the communication terminal of the inquiry destination, and the communication terminal of the inquiry destination is added to the registration means in the normal response signal generated by the replacement The capability information of the communication terminal of the inquiry destination registered in association with is added, and the capability information is returned to the inquiry source of the options request instead of the communication terminal of the inquiry destination. A response generation step;
A method of reducing traffic in a communication network system, comprising: A communication control apparatus that performs a call session control function in a communication network system including an IMS (IP Multimedia Subsystem) network,
Registration means for registering the communication terminal capability information received from a communication terminal located in the processing area of the communication control device in association with the communication terminal;
Using the capability information registered in the registration unit, an alternative unit that performs a response to the inquiry of capability information to the communication terminal via the communication control device instead of the communication terminal;
With
The alternative means is
Request determination means for determining that an options request (OPTIONS REQUEST) for requesting capability information from the communication terminal located in the area has been received from an inquiry source of capability information;
If the request determination unit determines that the options request to the communication terminal in the area is received from the inquiry source, the options request is not transferred to the communication terminal in the area that is the inquiry destination. The normal response signal (200 OK) indicating a normal response from the inquired communication terminal with respect to the options request is generated instead of the inquired communication terminal, and is generated by the alternative To the normal response signal, add the capability information of the communication terminal of the inquiry destination registered in the registration means in association with the communication terminal of the inquiry destination, and to the inquiry source of the options request Response generating means for responding capability information in place of the contact communication terminal;
A communication control device comprising: A control method of a communication control device that performs a call session control function in a communication network system including an IMS (IP Multimedia Subsystem) network,
A registration step of registering the capability information of the communication terminal received from a communication terminal located in the processing area of the communication control device in association with the communication terminal in a registration unit;
Using the capability information registered in the registration means, an alternative step of performing a response to the inquiry of capability information to the communication terminal via the communication control device instead of the communication terminal;
Including
The alternative step is:
A determination step of determining that an options request (OPTIONS REQUEST) for requesting capability information from the communication terminal located in the area has been received from an inquiry source of capability information;
In the determination step, a normal response from the inquiry communication terminal to the options request without transferring the options request to the communication terminal located in the inquiry to the communication terminal located in the inquiry destination. A normal response signal (200 OK) indicating that the communication terminal of the inquiry is generated instead of the communication terminal of the inquiry destination, and the communication terminal of the inquiry destination is added to the registration means in the normal response signal generated by the replacement The capability information of the communication terminal of the inquiry destination registered in association with is added, and the capability information is returned to the inquiry source of the options request instead of the communication terminal of the inquiry destination. A response generation step;
A control method for a communication control device, comprising: A control program for a communication control device that performs a call session control function in a communication network system including an IMS (IP Multimedia Subsystem) network,
A registration step of registering the capability information of the communication terminal received from a communication terminal located in the processing area of the communication control device in association with the communication terminal in a registration unit;
Using the capability information registered in the registration means, an alternative step of performing a response to the inquiry of capability information to the communication terminal via the communication control device instead of the communication terminal;
To the computer,
The alternative step is:
A determination step of determining that an options request (OPTIONS REQUEST) for requesting capability information from the communication terminal located in the area has been received from an inquiry source of capability information;
In the determination step, a normal response from the inquiry communication terminal to the options request without transferring the options request to the communication terminal located in the inquiry to the communication terminal located in the inquiry destination. A normal response signal (200 OK) indicating that the communication terminal of the inquiry is generated instead of the communication terminal of the inquiry destination, and the communication terminal of the inquiry destination is added to the registration means in the normal response signal generated by the replacement The capability information of the communication terminal of the inquiry destination registered in association with is added, and the capability information is returned to the inquiry source of the options request instead of the communication terminal of the inquiry destination. A response generation step;
A control program comprising:

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