JP2012084976A - Transfer service system, session control server, and transfer service control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique that enables an incoming call to be appropriately transferred in a network where a session is started to connect a call.SOLUTION: Subscriber data storage means stores a transfer scenario including transfer setting information indicating whether an incoming call is transferred or not, a transfer destination telephone number, and capability information indicating service capability of a corresponding terminal device. Transfer determination means receives a session start request for incoming, refers to a transfer scenario, and if transfer setting information indicates transfer and service capability of a terminal device is capable of providing a communication service requested in the session start request, determines that a call requested in the session start request is transferred, if not so, determines that the call is not transferred. Transfer processing means, if it is determined that the call is not transferred, relays the session start request to an incoming call destination terminal device and, if it is determined that the call is transferred, relays the session start request to a control device that accommodates a terminal device having a transfer destination telephone number.

Description

  The present invention relates to a technique for realizing a transfer service for transferring an incoming call in a next-generation network (hereinafter referred to as “NGN (Next Generation Network)”).

  NGN is a basic network that provides a general telephone service, a service that combines fixed communication and mobile communication, and a new information communication service that will be developed in the future (see, for example, Non-Patent Document 1).

  Further, NGN is characterized in that it can use high-performance media, unlike PSTN (Public Switched Telephony Network) that targets only voice communication. For example, in audio media, ITU-T (International Telecommunication Union Telecommunication Standardization Sector) G.G. In addition to G.711, G. 722 and G.E. It supports communication using 711.1. In video media, H. H.264 and high-definition video such as high-definition video are also supported.

  In order to start such high-performance media communication, NGN not only secures a bandwidth by exchanging information such as a communication type and a bandwidth, but also adjusts a media encoding rule between terminals in advance. This is because, if the communication media (payload type) requested by the calling terminal and the communication media (payload type) supported by the receiving terminal do not match, appropriate communication cannot be established.

  By the way, in the conventional PSTN, various additional services convenient for the user are provided. Among the additional services, the transfer service is one of important services, and it is necessary to provide a similar service in NGN. The transfer service is a service for transferring an incoming call to a transfer destination based on a preset condition when an incoming call is received.

  In the transfer service provided in the PSTN, when an incoming call is transferred to a predetermined transfer destination, the call is transferred unconditionally, transferred when there is no response, or only an incoming call from a registered telephone number is transferred. Various transfer conditions can be set. Thus, for example, by registering the telephone number of the calling subscriber in advance, it is possible to select the calling subscriber and transfer only the calls from the calling party with high importance to the specified forwarding destination. (For example, see Patent Document 1).

  In addition, as a conventional transfer technique in a system using an IP (Internet Protocol) network, there is a method of installing an IP / PSTN integrated control apparatus connected to both the IP network and the PSTN network (see Patent Document 2). An IP / PSTN integrated control apparatus includes: an IP network signal transmission / reception control unit for connecting to an IP network; a PSTN signal transmission / reception control unit for connecting to a PSTN; a terminal control unit for connecting a communication terminal; A data storage unit that stores control data including a central control unit that performs call connection control. The central control unit performs connection control based on operation modes such as transfer and voice storage stored in the data storage unit.

JP-A-8-223292 JP 2003-324522 A

Noritaka Uji, “NGN to Build a Rich Broadband Ubiquitous Society”, NTT Technology Journal 2007.12

  The transfer service in PSTN disclosed in Patent Document 1 is based on the configuration of a telephone line and a telephone exchange, and cannot be applied as it is to an NGN that starts a session in an IP network and connects a call. In addition, the transfer service in PSTN is a transfer service based on audio media (G.711), and there is no concept of high-functional media such as images that NGN handles.

  In addition, the technique disclosed in Patent Document 2 is to install an IP / PSTN integrated control device in a house to integrate the PSTN and the IP network. It cannot be applied to the connected NGN. This is also a transfer service based on audio media (G.711), and there is no concept of high-functional media such as images that NGN handles.

  The object of the present invention is to increase the transfer scenario setting even if the session control server does not have the function of determining the transfer destination based on the media information included in the session start request in the network that starts the session and connects the call. It is to provide a technique that makes it possible to appropriately transfer an incoming call of functional media communication.

In order to achieve the above object, a transfer service system of the present invention is a transfer service system used for communication between terminal devices capable of handling high-performance media,
A transfer scenario including transfer setting information indicating whether or not to transfer an incoming call, a transfer destination telephone number in the case of transfer, and capability information indicating a service capability of a terminal device of a corresponding subscriber telephone number; Subscriber data storage means for storing subscriber data in association with a subscriber telephone number;
Accepting an incoming session start request to the subscriber telephone number, referring to a transfer scenario corresponding to the subscriber telephone number, indicating that the transfer setting information is transferred, and a terminal of the subscriber telephone number If the service capability of the apparatus is capable of providing the communication service requested by the session start request, it is determined to transfer the call requested by the session start request, and if not, the call is transferred. Transfer determination means for determining not to, and
If it is determined not to transfer the call, the session start request is relayed to the terminal device of the subscriber telephone number, and if it is determined to transfer the call, the session start request is included in the transfer scenario. Transfer processing means for relaying to a control device accommodating the terminal device of the transfer destination telephone number.

  Further, the transfer determination means indicates that transfer setting information corresponding to the subscriber telephone number is transferred, but the service capability of the terminal device of the subscriber telephone number is requested by the session start request. When it is determined that the communication service cannot be provided, the transfer processing means stores the session start request in the terminal device with the subscriber telephone number and the terminal device with the transfer destination telephone number. It is also possible to return a rejection response to the session start request without relaying to the session.

  Further, the transfer determination means decides to transfer the call when transfer setting information corresponding to the subscriber telephone number indicates transfer, or transfer setting information corresponding to the subscriber telephone number. Indicates that the call is to be transferred, and if the service capability of the terminal device of the subscriber telephone number is capable of providing the communication service requested by the session start request, the call is transferred. This may be selected according to the setting of the function switch.

  The transfer determination means may include the function switch for each subscriber.

  Moreover, you may make it further have the transfer scenario input means which provides the interface for registering the said transfer scenario to the said subscriber data of the said subscriber data storage means.

Further, the transfer determination means and the transfer processing means are provided in a session control server,
The subscriber data storage means may be provided in a subscriber data storage device common to a plurality of session control servers.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to transfer the incoming call of high performance media communication appropriately in the network which starts a session and connects a call.

It is a block diagram which shows the structure of the communication system by this embodiment. It is a block diagram which shows the structure of the session control server 3b by this embodiment. It is a sequence diagram which shows an example of operation | movement of the communication system of this embodiment. It is a sequence diagram which shows the other example of operation | movement of the communication system of this embodiment. It is a sequence diagram which shows the further another example of operation | movement of the communication system of this embodiment. It is a figure which shows the subscriber data of the terminal device 4b accommodated in the session control server 3b in FIG. It is a figure which shows the subscriber data of the terminal device 4b accommodated in the session control server 3b in FIG.

  Embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of a communication system according to the present embodiment. Referring to the figure, the communication system includes session control servers 3a to 3c and subscriber terminal devices (hereinafter referred to as “terminal devices”) 4a to 4c.

  Here, when a session control server is indicated without specifying any of them, it is expressed as a session control server 3. Further, when a terminal device is indicated without specifying any one, it is expressed as a terminal device 4.

  The session control server 3a holds subscriber data 31a and accommodates the terminal device 4a. Similarly, the session control server 3b holds subscriber data 31b and accommodates the terminal device 4b. The session control server 3c holds subscriber data 31c and accommodates the terminal device 4c.

  The session control server 3b and the terminal device 4b are constituent elements of NGN1. In the description of the present embodiment, the description will be focused on the transfer of an incoming call to the terminal device 4b accommodated in the session control server 3b belonging to NGN1.

  It does not matter whether the transfer destination is in NGN1 or not. Therefore, the other session control server 3a, session control server 3c, subscriber data 31a, subscriber data 31c, terminal device 4a, and terminal device 4c may be components of NGN1, or are not components of NGN1. May be. For example, they may belong to a PSTN or a mobile communication network.

  The session control server 3 is a server that executes session control functions including call processing and transfer of incoming calls. The session control server 3 accommodates a plurality of subscribers and holds subscriber data for each subscriber. Details will be described later.

  The subscriber data 31 is information including a telephone number of the terminal device 4 of each subscriber and a transfer scenario for transferring an incoming call to the telephone number. In the present embodiment, an example in which the session control server 3 holds the subscriber data 31 is shown, but the present invention is not limited to this configuration. As another example, the subscriber data 31 may be held in a subscriber data storage device separate from the session control server 3, and the session control server 3 may access the subscriber data storage device as necessary. . Further, the subscriber data storage device may hold subscriber data of subscribers accommodated in the plurality of session control servers 3 and the plurality of session control servers 3 may access in common.

  The terminal device 4 is a terminal device that the subscriber uses for communication. The terminal device 4 is used for registration, change, and cancellation of a transfer scenario included in subscriber data in addition to normal communication.

  In FIG. 1, three session control servers 3 and three terminal devices 4 are shown for convenience of illustration, but more of each may exist. In addition, here, the session control servers 3a to 3c are independently configured, but a part or all of the session control servers 3a to 3c may be integrally configured.

  FIG. 2 is a block diagram showing the configuration of the session control server 3b according to this embodiment. The session control server 3b is a server belonging to NGN1 as described above.

  Referring to FIG. 2, the session control server 3b includes a session control unit 51 and a subscriber data storage unit 52, and may further include a transfer scenario input unit 53. The session control unit 51 is a processing unit that performs session control, and includes a transfer determination unit 54 and a transfer processing unit 55 as a configuration related to the present invention.

  The subscriber data storage unit 52 stores the above-described subscriber data 31b. In the subscriber data 31b, a transfer scenario including transfer setting information indicating whether or not to transfer an incoming call and a transfer destination telephone number in the case of transfer is recorded in association with the subscriber telephone number. In the example of FIG. 1, the subscriber telephone number of the terminal device 4b is 012-345-6666.

  The transfer determination unit 54 receives an incoming session start request to the subscriber telephone number of the terminal device 4b accommodated in the session control server 3b, and sets the transfer scenario corresponding to the subscriber telephone number in the subscriber data 31b. By referring to the included transfer setting information, it is determined whether or not to transfer the call requested by the session start request.

  When the transfer determination unit 54 determines that the call is not transferred, the transfer processing unit 55 relays the session start request to the terminal device having the subscriber telephone number. If the transfer determination unit 54 determines to transfer the call, the transfer processing unit 55 relays the session start request to the session control server 3 that accommodates the terminal device 4 having the transfer destination telephone number included in the transfer scenario. To do.

  The transfer scenario input unit 53 is an interface for registering a transfer scenario in the subscriber data 31b of the subscriber data storage unit 52. For example, when the subscriber performs a predetermined operation on the terminal device 3b, the transfer scenario input unit 53 can accept it and register the transfer scenario in the subscriber data 31b.

  As described above, according to the present embodiment, when the session control server 3b accepts an incoming session start request for a subscriber telephone number and does not transfer the incoming call, the terminal device 4b for the subscriber telephone number is used. When an incoming call is transferred, the session start request is relayed to the session control server 3 that accommodates the terminal device 4 having the transfer destination telephone number. Therefore, the incoming call can be appropriately transferred in the NGN 1 that starts the session and connects the call.

  The transfer setting information may not only indicate whether the incoming call is to be transferred, but may also be set with a transfer condition such that the incoming call is transferred when a predetermined transfer condition is satisfied. It is possible to set transfer conditions such as no response transfer start when there is no response for a certain period of time, unconditional transfer start without transfer, transfer not start without transfer, and transfer not possible without transfer. May be. Furthermore, it may be possible to set such that only incoming calls on a predetermined day of the week are transferred or only incoming calls on a predetermined time zone are transferred. In that case, the transfer determination unit 54 may determine to transfer the incoming call when the transfer condition is satisfied.

  Moreover, as a preferable aspect in the present embodiment, the transfer scenario stored in the subscriber data storage unit 52 further includes capability information indicating the service capability of the terminal device 4b of the subscriber telephone number corresponding to the transfer scenario. include. When the transfer determination unit 54 accepts a session start request, the transfer determination unit 54 indicates that transfer setting information corresponding to the subscriber telephone number is transferred, and the service capability of the terminal device 4 of the subscriber telephone number indicates the session start request. When it is possible to provide the communication service requested by the method, it is determined that the call requested by the session start request is transferred. Otherwise, the transfer determination unit 54 determines not to transfer the call. The communication service here is a type of service such as communication only by voice, communication by voice and video, or communication by voice, video and data, and corresponds to the payload type required for communication.

  As a result, in the NGN 1 that provides a high-performance communication service using various media, the incoming call can be transferred only when the transfer destination terminal device 4 can provide the required communication service. In the NGN 1 that provides the service, it is possible to realize a transfer service appropriate for high-performance media communication.

  Further, the transfer determination unit 54 indicates that the transfer setting information corresponding to the subscriber telephone number is transferred, but the service capability of the terminal device of the subscriber telephone number is requested by the session start request. If it is determined that the service cannot be provided, the transfer processing unit 55 relays the session start request to the terminal device 4b having the subscriber number and the session control server 3 accommodating the terminal device 4 having the transfer destination number. Instead, a rejection response to the session start request may be returned.

  As another modification, the transfer determination unit 54 determines whether to transfer the incoming call when the transfer setting information corresponding to the subscriber telephone number indicates transfer, or corresponds to the subscriber telephone number. When the transfer setting information indicates that the call is to be transferred, and the service capability of the terminal device 4b of the subscriber telephone number is capable of providing the communication service requested by the session start request, the incoming call is transferred. It may be selected according to the setting of the function switch. The function switch is a functional switch that is set as information by the communication carrier, is held by the transfer determination unit 54 of the session control server 3b, and operates according to the setting.

  According to this, when the destination terminal device 4 can provide the requested communication service, the incoming call is transferred regardless of whether the destination terminal device 4b supports the communication service. It can be switched by the function switch whether it is performed or only when the destination terminal device 4b is compatible with the communication service. More diverse transfer services can be realized.

  The function switch may be common to the subscribers accommodated in the session control server 3b, or the function switch may be provided for each subscriber. When the function switch is provided for each subscriber, for example, the function switch may be included in the subscriber data.

  Further, only the session control unit 51 may be provided in the session control server 3b, and the subscriber data storage unit 52 may be provided in a subscriber data storage device separate from the session control server 3b. In that case, the subscriber data storage device may store the subscriber data of the subscribers accommodated in the plurality of session control servers 3. The subscriber data storage device may further include a transfer scenario input unit 53.

  Hereinafter, an example of the operation of the entire communication system and the session control server 3b according to the present embodiment will be described.

  FIG. 3 is a sequence diagram illustrating an example of the operation of the communication system according to the present embodiment.

  FIG. 3 shows an operation example when an incoming call is received from the terminal device 4a to the terminal device 4b for which transfer of incoming calls is not set. FIG. 6 is a diagram showing subscriber data of the terminal device 4b accommodated in the session control server 3b in FIG. The payload type in FIG. 6 corresponds to service information, and transfer activation not activated corresponds to transfer setting information. As can be seen from FIG. 6, “transfer not activated” is set in the terminal device 4 b of the subscriber telephone number 012-345-6666. The service information is information indicating the type of communication service according to the payload type of the communication packet. The communication service here is a type of service such as communication only by voice, communication by voice and video, or communication by voice, video and data. Further, different types may be used depending on the CODEC encoding method of audio and video. Also, here, “calling” is added to the device on the call origination side, and “arrival” is added to the device on the callee side.

  The calling terminal device 4a transmits an INVITEwithSDPc signal in order to establish communication with the called terminal device 4b (step A1). SDP (Session Description Protocol) describes information such as a payload type necessary for starting a session in multimedia, and INVITEwithSDPc is an INVITE signal for requesting setting of a call of payload type c. Here, audio and video communication data are shown.

  The destination terminal device 4b is assumed to be a terminal having a payload type b function. Here, the payload type b indicates communication data only for voice.

  The originating session control server 3a relays the INVITEwithSDPc signal to the destination session control server 3b (step A2). When the destination session control server 3b receives the INVITEwithSDPc signal, the destination session control server 3b searches for the subscriber data using the destination destination telephone number “012-345-6666” included in the INVITEwithSDPc signal as a key.

  Here, as shown in FIG. 6, the transfer scenario registered in the subscriber data of the subscriber telephone number “012-345-6666” is “transfer not activated”. Therefore, the destination session control server 3b relays the INVITEwithSDPc signal to the destination terminal device 4b as the “transfer not activated” transfer process (step A3) (step A4).

  Since the destination terminal device 4b does not support the function of the payload type c, it determines that the incoming call is impossible in the media type determination process (step A5).

  The called terminal device 4b returns a 488 signal rejecting the incoming call to the called session control server 3b (step A6). The 488 signal is relayed by the incoming session control server 3b and the outgoing session control server 3a (step A7), and reaches the outgoing terminal device 4a. As a result, the payload type negotiation fails and communication is not established (step 8).

  FIG. 4 is a sequence diagram illustrating another example of the operation of the communication system according to the present embodiment.

  FIG. 4 shows an operation example when an incoming call is received from the terminal device 4a to the terminal device 4b for which transfer of incoming calls is set. FIG. 7 shows subscriber data of the terminal device 4b accommodated in the session control server 3b in FIG. As in FIG. 6, the payload type in FIG. 7 corresponds to service information, and transfer activation not activated corresponds to transfer setting information. As can be seen from FIG. 7, “unconditional transfer activation” is set in the terminal device 4b of the subscriber telephone number 012-345-6666, and “023-456-7777” is set as the transfer destination telephone number. ing. This is a setting in which an incoming call is unconditionally transferred to 023-456-7777.

  The calling terminal device 4a transmits an INVITEwithSDPc signal in order to establish communication with the called terminal device 4b (step B1). INVITEwithSDPc is an INVITE signal that requests payload type c (audio and video communication data).

  Here, it is assumed that the destination terminal device 4c is a terminal having a payload type c function. The next step B2 is the same as step A2 in FIG.

  Next, when the incoming session control server 3b searches for subscriber data using the incoming telephone number “012-345-6666” as a key, “unconditional transfer activation” is set corresponding to the incoming telephone number. FIG. 4 differs from FIG. 3 in this respect.

  The destination session control server 3b becomes a transfer source and performs a transfer process of “unconditional transfer activation” (step B3). As a transfer process, the destination session control server 3b relays the INVITEwithSDPc signal to the destination transfer destination session control server 3c without relaying the INVITEwithSDPc signal to the destination terminal device 4b (step B4). The destination transfer destination session control server 3c transfers the INVITEwithSDPc signal to the destination transfer destination terminal apparatus 4c.

  The destination transfer destination terminal device 4c determines whether or not an incoming call is possible as the payload type determination process (step B5). Since the terminal device 4c corresponds to the payload type c function, the destination transfer destination terminal device 4c determines that the incoming call is possible. Here, by determining that the payload type c can be received in this way, it is possible to establish communication with high-performance media.

  The destination transfer destination terminal device 4c returns a 200 OK signal for accepting session establishment to the destination transfer destination session control server 3c (step B6). The 200 OK signal is relayed by the destination transfer destination session control server 3b and the destination transfer source session control server 3a (step B7), and reaches the calling terminal device 4a. Thereby, payload type negotiation is successful and communication is established (step B8).

  In this sequence, by setting “unconditional transfer activation” in the session control server 3b, the terminal device 31b is not subjected to the payload type determination process, and the incoming call is transferred to the terminal device 4c corresponding to the payload type c. This makes it possible to establish communication of high-performance media of payload type c. As a result, a novel service utilizing NGN that handles high-performance media is realized.

  However, as another idea, high function media communication to the terminal device 4b that does not support high function media communication such as payload type c is not established by setting unconditional transfer activation. It is also possible to operate the system. The payload type b of the terminal device 4b managed by the session control server 3b can be freely expanded to the payload type c by the subscriber of the terminal device 4b, which can be a problem in terms of subscriber data management and resource consumption. Because.

  FIG. 5 is a sequence diagram showing still another example of the operation of the communication system according to the present embodiment.

  As in FIG. 4, FIG. 5 shows an operation example when an incoming call is received from the terminal device 4a to the terminal device 4b for which transfer of incoming calls is set. However, FIG. 5 shows an operation that does not allow high-performance media communication by setting a transfer scenario. The subscriber data of the terminal device 4b accommodated in the session control server 3b in FIG. 5 is the same as that shown in FIG.

  The sequence in FIG. 5 is different from the sequence in FIGS. 3 and 4 in that the payload determination process is executed not by the destination terminal device 4 but by the destination session control server 3b.

  The calling terminal device 4a transmits an INVITEwithSDPc signal in order to establish communication with the called terminal device 4b (step C1). INVITEwithSDPc is an INVITE signal that requests payload type c (audio and video communication data).

  INVITEwithSDPc is relayed by the originating session control server 3a (step C2) and received by the terminating session control server 3b.

  The incoming session control server 3b searches for subscriber data using the incoming telephone number “012-345-6666” extracted from the received INVITEwithSDPc signal as a key.

  Here, as shown in FIG. 7, the transfer scenario registered in the subscriber data “012-345-6666” is “unconditional transfer activation”. Therefore, the destination session control server 3b starts the transfer process of “unconditional transfer activation” (step C3).

  However, here, the incoming session control server 3b further performs payload determination processing (step C5). In the payload determination process, the destination session control server 3b recognizes that the payload type b that the destination terminal device 4b can handle is “voice only” from the data registered in the subscriber data “012-345-6666”. . Then, the incoming session control server 3b compares the payload type c requested by the incoming call with the payload type b that can be handled by the incoming terminal device 4b, and determines that transfer is impossible. Therefore, the SIP sequence (step C4, step C6) indicated by the broken line between the incoming session control server 3b and the incoming terminal device 4b in FIG. 5 is not executed.

  Instead, the terminating session control server 3b returns a 488 signal to the originating session control server 3a (step C7). In this example, it is possible to manage the payload type to be negotiated on the session control server 3 side in this way.

  3 and 4, the incoming session control server 3b does not perform the payload type determination process, and in FIG. 5, the incoming session control server 3b performs the payload type determination process. However, it may be arbitrarily set by the function switch whether or not the incoming session control server 3b performs the payload type determination process. By providing such a function switch in the session control server 3b, it is possible to employ any of the sequences shown in FIGS.

  The function switch may be a function switch common to all subscribers accommodated in the session control server 3b, or may be provided for each subscriber. For each subscriber, it is possible to individually set whether or not extension to high-performance media communication is possible for the subscriber.

  As described above, according to the present embodiment, for example, the subscriber is a home telephone having the telephone number 012-345-6666 at the subscriber telephone number 012-345-6666 and the telephone number 012-345-6666 at night. It can be set so that the terminal device 4b receives the call, and the call is transferred to the terminal device 4c corresponding to the voice and video media of another telephone number 012-345-7777 in the daytime. Thereby, for example, it becomes possible to provide a service according to the time zone and the communication medium of the incoming call as shown below.

If the incoming call from the calling subscriber is voice communication, it is handled as follows at night and daytime.
・ Perform a voice call at home at the telephone number 012-345-6666 at night.
In the daytime, a voice call is performed with the terminal device 4 having the telephone number 012-345-7777 corresponding to the office audio and video media.

In addition, if the incoming call from the calling subscriber is communication using audio and video media, it is handled as follows at night and daytime.
-At night, incoming calls cannot be made at the home telephone terminal of the telephone number 012-345-6666.
In the daytime, voice and video communication is performed by the terminal device 4 having the telephone number 012-345-7777 corresponding to the office voice and video media.

  Conventionally, if the call media intended by the calling subscriber is voice and video, the incoming call terminal 4b with the telephone number 012-345-6666 is set to be incompatible with the voice media only. Or communication was established only with audio media by media fallback. However, according to the present embodiment, an appropriate transfer scenario is set in advance and transferred to the terminal device 4 having the telephone number 012-345-7777 capable of handling audio and video media. It becomes possible to establish communication by. As described above, according to the present embodiment, not only a transfer service equivalent to PSTN is realized by NGN, but also a highly convenient transfer service that cannot be considered by PSTN with only audio media can be realized by NGN. It becomes possible.

1 NGN
3, 3a-3c Session control server 4, 4a-4c Terminal device 51 Session control unit 52 Subscriber data storage unit 53 Transfer scenario input unit 54 Transfer determination unit 55 Transfer processing unit

Claims (9)

A transfer service system used for communication between terminal devices capable of handling high-performance media,
A transfer scenario including transfer setting information indicating whether or not to transfer an incoming call, a transfer destination telephone number in the case of transfer, and capability information indicating a service capability of a terminal device of a corresponding subscriber telephone number; Subscriber data storage means for storing subscriber data in association with a subscriber telephone number;
Accepting an incoming session start request to the subscriber telephone number, referring to a transfer scenario corresponding to the subscriber telephone number, indicating that the transfer setting information is transferred, and a terminal of the subscriber telephone number If the service capability of the apparatus is capable of providing the communication service requested by the session start request, it is determined to transfer the call requested by the session start request, and if not, the call is transferred. Transfer determination means for determining not to, and
If it is determined not to transfer the call, the session start request is relayed to the terminal device of the subscriber telephone number, and if it is determined to transfer the call, the session start request is included in the transfer scenario. And a transfer processing means for relaying to a control device accommodating the terminal device of the transfer destination telephone number. The transfer determination means indicates that the transfer setting information corresponding to the subscriber telephone number is transferred, and the service capability of the terminal device of the subscriber telephone number is requested by the session start request. If it is determined that the service cannot be provided, the transfer processing means sends the session start request to the terminal device having the subscriber telephone number and the control device accommodating the terminal device having the transfer destination telephone number. Return a rejection response to the session start request without relaying.
The transfer service system according to claim 1.   The transfer determining means transfers the call when transfer setting information corresponding to the subscriber telephone number indicates transfer, or transfer setting information corresponding to the subscriber telephone number is transferred. And whether the call is to be transferred when the service capability of the terminal device of the subscriber telephone number is capable of providing the communication service requested by the session start request. The transfer service system according to claim 1, wherein the transfer service system is stored in advance as a function switch and selects an operation according to the setting of the function switch.   The transfer service system according to claim 3, wherein the transfer determination unit includes the function switch for each subscriber.   5. The transfer service system according to claim 1, further comprising transfer scenario input means for providing an interface for registering the transfer scenario in the subscriber data of the subscriber data storage means. The transfer determination means and the transfer processing means are provided in a session control server,
6. The transfer service system according to claim 1, wherein the subscriber data storage means is provided in a subscriber data storage device common to a plurality of session control servers.   The session control server which has the said transfer determination means as described in any one of Claim 1 to 4, and the said transfer process means.   6. A session control server comprising: the subscriber data storage unit according to claim 5; the transfer determination unit; the transfer processing unit; and the transfer scenario input unit. A transfer service control method used for communication between terminal devices capable of handling high-performance media,
A transfer scenario including transfer setting information indicating whether or not to transfer an incoming call, a transfer destination telephone number in the case of transfer, and capability information indicating the service capability of the terminal device of the corresponding subscriber telephone number In association with the phone number, pre-store in subscriber data,
Accepting an incoming session start request to the subscriber telephone number, referring to a transfer scenario corresponding to the subscriber telephone number, indicating that the transfer setting information is transferred, and a terminal of the subscriber telephone number If the service capability of the apparatus is capable of providing the communication service requested by the session start request, it is determined to transfer the call requested by the session start request, and if not, the call is transferred. And decide not to
If it is determined not to transfer the call, the session start request is relayed to the terminal device of the subscriber telephone number,
When it is determined that the call is to be transferred, a transfer service control method of relaying the session start request to a control device accommodating a terminal device having a transfer destination telephone number included in the transfer scenario.

Images