JP6663879B2 - Ring tone providing auxiliary device, ring tone providing auxiliary method, and ring tone providing auxiliary program - Google Patents

Description

  The present invention relates to a technique of a guidance providing method in an interconnection between IMS (IP Multimedia Subsystem) networks of different communication carriers.

  Non-Patent Document 1 defines a method of providing transfer guidance to a calling user using the guidance procedure of Non-Patent Document 2 (FIG. 10). Specifically, as a method of providing transfer guidance performed by an AS (Application Server) / MRF (Media Resource Function), (1) a Gateway model method for terminating a SIP dialog between an originating terminal and an AS / between an AS and a destination terminal ( FIG. 11), (2) Forking model method for establishing a plurality of SIP dialogs at the calling terminal is defined (FIG. 12).

“Communication Diversion (CDIV) using IP Multimedia (IM) Core Network (CN) subsystem”, 3GPP TS 24.604 v14.0.0 “Common Basic Communication procedures using IP Multimedia (IM) Core Network (CN) subsystem”, 3GPP TS 24.628 v14.0.0 “IMS Profile for Voice and SMS”, GSMA IR.92 Version 9.0

  According to FIGS. 10 to 12, when the originating terminal transmits an INVITE request for call connection and the destination terminal establishes a media path with a provisional response (1xx response) before a final response (200 OK response), (P-Early-Media) is used. This early media is used, for example, when a service provider provides transfer guidance and RBT (Ringing Back Tone).

  Here, in the Voice over Long Term Evolution (VoLTE) terminal and the fixed terminal compliant with the Japanese standard (JT-Q3402) of Non-Patent Document 3, a P-Early in which an SDP (Session Description Protocol) answer and a sendonly or sendrecv parameter are set. -As long as a 180 or 183 response including a Media header is received, an attempt is made to continue playing the early media from the network side.

  Therefore, as shown in FIG. 13 and FIG. 14, after the AS / MRF sends the 180 or 183 response to provide the transfer guidance to the calling terminal A, the transfer destination and / or the transfer source use the RBT early media. Without providing, there was a problem that the calling user could not hear the RBT from the end of the transfer guidance to the start of the call.

  The present invention has been made in view of the above circumstances, and has as its object to provide an RBT to a calling user even after providing transfer guidance.

  In order to solve the above problems, a ringing tone providing auxiliary device according to claim 1 manages a transmitted and untransmitted call transfer guidance to a calling terminal for each call, and a SIP unit after transmitting the transfer guidance. A connection unit that connects to a ringing tone output device and transmits a ringing tone to a calling terminal of the call for a call to which early media information of (Session Initiation Protocol) is not transmitted.

  The ringing tone providing auxiliary device according to claim 2 is the ringing tone providing auxiliary device according to claim 1, wherein the ringing tone providing auxiliary device is included in the early media information after receiving the early media information related to the ringing tone from the ringing tone output device. And a transfer unit for transmitting an UPDATE request in which an SDP (Session Description Protocol) is set to the calling terminal of the call.

  The ringing tone providing assistance method according to claim 3, wherein the ringing tone providing assistance device determines whether the transmission of the call transfer guidance to the calling terminal has been performed or not transmitted on a call-by-call basis. Managing and, for a call to which early media information of SIP (Session Initiation Protocol) has not been transmitted after transmission of the transfer guidance, connecting to a ringing tone output device and transmitting a ringing tone to the calling terminal of the call Is performed.

  According to a fourth aspect of the present invention, there is provided a ring tone providing auxiliary program that causes a computer to function as the ring tone providing auxiliary device according to the first or second aspect.

  According to the present invention, the RBT can be provided to the calling user even after the transfer guidance is provided.

FIG. 3 is a diagram illustrating a functional block configuration of a ringing tone provision assisting device. It is a figure showing the whole system composition. FIG. 7 is a diagram illustrating a processing sequence (Forking model) of an operation example 1; FIG. 7 is a diagram illustrating a processing sequence (Forking model) of an operation example 1; FIG. 14 is a diagram illustrating an example of a Filter Criteria of an operation example 1. FIG. 7 is a diagram illustrating a processing sequence (Gateway model) of an operation example 1; FIG. 9 is a diagram illustrating a processing sequence (Forking model) of an operation example 2; FIG. 9 is a diagram illustrating a processing sequence (Forking model) of an operation example 2; FIG. 14 is a diagram illustrating an example of a Filter Criteria of an operation example 2; It is a figure which shows the provision processing sequence of transfer guidance. FIG. 4 is a diagram showing a processing sequence of a Gateway model. FIG. 4 is a diagram illustrating a processing sequence of a Forking model. It is a reference figure at the time of a problem explanation in a Gateway model. It is a reference figure at the time of a task explanation in a Forking model.

  In the present invention, after the AS / MRF sends the 180 or 183 response to provide the transfer guidance, if the early media information is not transmitted from the transfer destination, that is, the SDP answer and the sendrecv or sendonly parameter are set from the transfer destination Only when not receiving the 180 or 183 response including the P-Early-Media header, the source AS / MRF or the S-CSCF (Serving Call Session Control Function) accommodating the source user becomes the AS / MRF dedicated to RBT provision. Connecting.

  More specifically, the state where transfer guidance has been provided and not provided is dynamically held as a Filter Criteria for each call, and only calls for which transfer guidance has been provided are connected to the AS / MRF dedicated to RBT provision. As a result, the RBT can be reliably provided to the calling user even after the transfer guidance is provided. Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  Since the source AS / MRF or the S-CSCF accommodating the source user (hereinafter referred to as the source AS / MRF) connects to the AS / MRF dedicated to RBT provision, the function (ring tone) (Providing auxiliary device). FIG. 1 shows a functional block configuration of the ringing tone providing auxiliary device. The ringtone providing assistance device 1 includes a management unit 11, a connection unit 12, and a transfer unit 13.

  The management unit 11 obtains information on the calling terminal and the call destination from the received call, and further, according to the progress of the call processing, transmits the transfer guidance to the calling terminal, or transmits the early media after transmitting the transfer guidance. Is a function unit that dynamically holds and manages as a Filter Criteria (hereinafter, FC) for each call.

  The connection unit 12 refers to the FC of the management unit 11, and connects to the RBT-provided AS / MRF by connecting to the RBT-provided AS / MRF for a call in which the early media is not transmitted to the calling terminal after the transmission guidance is transmitted. Is transmitted to the calling terminal of the call.

  The transfer unit 13 is a functional unit that transfers the RBT early media and the RBT transmitted from the AS / MRF dedicated to provide the RBT to the calling terminal. For example, when the transfer source AS / MRF or the like including the ringing tone providing auxiliary device 1 adopts the guidance providing method of the Forking model, the transfer unit 13 performs a process of simply transferring the early media and the RBT related to the RBT. . In the case of the Gateway model, the transfer unit 13 performs a process of transmitting an UPDATE request in which an SDP included in the RBT early media is set (media reassignment process).

  Next, the overall configuration of the system will be described. In the present embodiment, the network comprises an IMS / VoIP (Voice over Internet Protocol) network in which IMS networks of different communication carriers are interconnected. As shown in FIG. 2, the source S-CSCF 100, the source AS / MRF (Transfer) 200, an AS / MRF (RBT) 300 dedicated to RBT provision, and an S-CSCF 400 as a transfer destination.

  The S-CSCF 100 is a session control server that processes a call from a calling terminal. The AS / MRF (transfer) 200 is an application server (AS; Application Server) and a media server (MRF; Media Resource Function) that perform call transfer processing and provide transfer guidance and media such as RBT. The above-mentioned ringing tone providing auxiliary device 1 operates with the S-CSCF 100 or the AS / MRF (transfer) 200.

  The AS / MRF (RBT) 300 is an application server and a media server (ring output device) dedicated to RBT provision. The S-CSCF 400 is a session control server that processes a call signal from a calling terminal and establishes a communication path with the called terminal.

  Note that the names of the session control server, the application server, and the media server are examples. For example, the S-CSCF 100 may be expressed as a SIP server, a call control server, or a call processing server in addition to the session control server.

  Next, an operation performed in the present embodiment will be described. Specifically, an operation example 1 in the case where the ringing tone providing auxiliary device 1 operates with the AS / MRF (transfer) 200 and an operation example 2 in the case where the ringing tone providing auxiliary device 1 operates with the S-CSCF 100 will be described. Note that these operations include a ringing tone provision assisting method performed by the ringing tone assistance device 1.

(Operation example 1)
In the first operation example, a description will be given of a case where the ringing tone provision assisting device 1 is mounted on an AS / MRF (transfer) 200 that performs call forwarding, and the AS / MRF (transfer) 200 applies the guidance providing method of the Forking model. I do. FIGS. 3 and 4 show the processing sequence of the first operation example.

  First, after receiving the initial INVITE request of the calling terminal A for the called terminal B, the S-CSCF 100 determines whether or not the called terminal B of the called party matches iFC (initial Filter Criteria) (step S101). If the called terminal B is subscribed to the call transfer service, the S-CSCF 100 transfers the initial INVITE request to the AS / MRF (transfer) 200 (step S102).

  Next, the AS / MRF (transfer) 200 acquires the Call-ID and the value of the From tag from the received initial INVITE request, and stores them in the FC of the call related to the initial INVITE request (step S103). An example of FC is shown in FIG.

  Next, the AS / MRF (transfer) 200 activates the transfer guidance (Step S104), and transmits the 183 Session Progress including the SDP answer and the P-Early-Media header in which the sendrecv parameter is set via the S-CSCF 100. After the transmission to the calling terminal A (step S105), “provided” is set in the item of “transfer guidance” of the FC (step S106). Thereafter, transfer guidance is transmitted from the AS / MRF (transfer) 200 to the calling terminal A.

  Next, the AS / MRF (transfer) 200 starts the transfer start processing of the initial INVITE request, sets “started” in the “transfer start” item of the FC (step S107), and then sets the initial INVITE request. Is transmitted to the S-CSCF 100 (step S108).

  Next, S-CSCF 100 transfers the received initial INVITE request to S-CSCF 400 that accommodates destination terminal B, and transfers 180 Ringing returned in response to the initial INVITE request to AS / MRF (transfer) 200. (Step S109).

  Next, the AS / MRF (transfer) 200 refers to the FC related to the call corresponding to the transferred 180 Ringing, and determines whether or not the value of each item set in the FC of the call matches the specified value. A determination is made (step S110). If all the items match the specified values, the AS / MRF (transfer) 200 connects to the AS / MRF (RBT) 300 (step S111).

  Specifically, referring to the FC of the corresponding call, for example, “Provisioned” is set in the “Transfer guidance” item, “Started” is set in the “Transfer start” item, and “ When “none” is set in the item of “early media”, the calling terminal A is regarded as a silent state, and an initial INVITE request is transmitted to the AS / MRF (RBT) 300.

  After that, in response to the initial INVITE request, AS / MRF (RBT) 300 returns 183 Session Progress including the SDP answer and the P-Early-Media header in which the sendrecv parameter is set. After receiving the 183 Session Progress, the 200 sets “provided” in the item of “early media after transfer start” of the FC (step S112), and sets the 183 Session Progress via the S-CSCF 100. Transfer to the calling terminal A (step S113). Thereafter, the RBT is transmitted from the AS / MRF (RBT) 300 to the calling terminal A. As a result, the RBT can be provided to the calling user even after the transfer guidance is provided, and the silent period can be shortened.

  Thereafter, when the receiving terminal B responds, 200 OK (INV) is transmitted via the S-CSCF 400, so the S-CSCF 100 transfers the 200 OK (INV) to the AS / MRF (transfer) 200 ( In step S114, the AS / MRF (transfer) 200 performs predetermined processing on the 200 OK (INV), and then transmits the result to the calling terminal A via the S-CSCF 100 (step S115). Thereafter, a communication path is established between the calling terminal A and the called terminal B. However, to stop the RBT from the AS / MRF (RBT) 300, the S-CSCF 100 or the AS / MRF (transfer) 200 transmits the BYE request. Is transmitted to the AS / MRF (RBT) 300 (step S116).

(Modification of Operation Example 1)
A case will be described in which the AS / MRF (transfer) 200 adopts the gateway model guidance providing method. In this case, in step S113, the AS / MRF (transfer) 200 transmits an UPDATE request in which the SDP received from the AS / MRF (RBT) 300 is set according to step S111 instead of transferring 183 Session Progress (step S113). Perform media reassignment). Similarly, the AS / MRF (transfer) 200 transmits an UPDATE request in which the SDP received from the AS / MRF (RBT) 300 is set after the step S114, as shown in step S114 ′ in FIG. Perform media reassignment).

(Operation example 2)
In the second operation example, a case will be described in which the ringing tone provision assisting device 1 is mounted on the S-CSCF 100 and the AS / MRF (transfer) 200 applies the guidance providing method of the Forking model. The processing sequence of this operation example 2 is shown in FIGS.

  First, after receiving the initial INVITE request of the calling terminal A for the called terminal B, the S-CSCF 100 determines whether or not the called terminal B of the called party matches iFC (step S201). Then, if the called terminal B is subscribed to the call transfer service, the S-CSCF 100 transfers the initial INVITE request to the AS / MRF (transfer) 200 (step S202), and from the initial INVITE request, the Call-ID and From The tag value is acquired and stored in the FC (step S203). FIG. 9 shows an example of FC.

  Next, the AS / MRF (transfer) 200 activates the transfer guidance (step S204), and transmits the 183 Session Progress including the SDP answer and the P-Early-Media header in which the sendrecv parameter is set via the S-CSCF 100. The message is transmitted to the calling terminal A (step S205). At this time, at the timing when the 183 Session Progress is received from the AS / MRF (transfer) 200, the S-CSCF 100 sets “provided” in the “transfer guidance” item of the FC (step S206).

  Next, the AS / MRF (transfer) 200 starts transfer activation processing of the initial INVITE request (step S207), and transmits the initial INVITE request to the S-CSCF 100 (step S208).

  Next, when receiving the initial INVITE request from the AS / MRF (transfer) 200, the S-CSCF 100 sets “started” in the “transfer start” item of the FC (step S209).

  Thereafter, S-CSCF 100 transfers the received initial INVITE request to S-CSCF 400 accommodating destination terminal B, and upon receiving 180 Ringing in response to the initial INVITE request (step S210), calls corresponding to the 180 Ringing. It is determined whether or not the value of each item set in the FC of the call matches the specified value with reference to the FC according to (step S211). Then, when all the items match the specified values, the S-CSCF 100 connects to the AS / MRF (RBT) 300 (Step S212).

  After that, in response to the initial INVITE request, the AS / MRF (RBT) 300 returns 183 Session Progress including the SDP answer and the P-Early-Media header in which the sendrecv parameter is set, so that the S-CSCF 100 Upon receiving the 183 Session Progress, the item “provided” is set in the “Early media after transfer start” field of the FC (step S213), and the 183 Session Progress is transferred to the calling terminal A (step S214). Thereafter, the RBT is transmitted from the AS / MRF (RBT) 300 to the calling terminal A. As a result, the RBT can be provided to the calling user even after the transfer guidance is provided.

  Thereafter, when the receiving terminal B responds, 200 OK (INV) is transmitted via the S-CSCF 400, so the S-CSCF 100 transfers the 200 OK (INV) to the AS / MRF (transfer) 200 ( In step S215), the AS / MRF (transfer) 200 performs predetermined processing on the 200 OK (INV), and then transmits the result to the calling terminal A via the S-CSCF 100 (step S216). Thereafter, a communication path is established between the calling terminal A and the called terminal B. However, to stop the RBT from the AS / MRF (RBT) 300, the S-CSCF 100 sends a BYE request to the AS / MRF (RBT) 300. (Step S217).

(Modification of Operation Example 2)
A case will be described in which the AS / MRF (transfer) 200 adopts the gateway model guidance providing method. In this case, in step S214, the S-CSCF 100 transmits an UPDATE request in which the SDP received from the AS / MRF (RBT) 300 is set in step S212 instead of transferring the 183 Session Progress (executes media reassignment). Do). Also, the S-CSCF 100 transmits an UPDATE request in which the SDP received from the AS / MRF (RBT) 300 is set between steps S215 to S216, as in step S114 ′ shown in FIG. Perform media reassignment).

  As described above, according to the present embodiment, S-CSCF 100 or AS / MRF (transfer) 200 (ringing sound provision assisting device 1) manages the transmitted and untransmitted call transfer guidance to the calling terminal for each call. However, for a call for which early media has not been transmitted after transmission of the transfer guidance, the call is connected to the AS / MRF (RBT) 300 dedicated to providing the RBT and the RBT is transmitted to the calling terminal of the call. RBT can be provided to the calling user.

  Note that, in the present embodiment, the case where the ringing tone providing auxiliary device 1 operates with the S-CSCF 100 or the AS / MRF (transfer) 200 has been described as an example, but the ringing tone providing auxiliary device 1 is realized with another device configuring the IMS / VoIP network. You may. Basically, a group of devices constituting the IMS / VoIP network can communicate with each other, so that data transmitted / received by the S-CSCF 100 or the AS / MRF (transfer) 200 is mirrored to other devices for remote monitoring or control. It is possible. Therefore, it is of course conceivable to execute the above-mentioned voice sound provision assisting method on a device other than the S-CSCF 100 or the AS / MRF (transfer) 200.

  Finally, the ringing tone providing assistance device 1 described in the present embodiment can be realized by a computer. It is also possible to create a ringing tone providing auxiliary program for causing a computer to function as the ringing tone providing auxiliary device 1 and a storage medium for the ringing tone providing auxiliary program.

DESCRIPTION OF SYMBOLS 1 ... Ring-tone provision assistance apparatus 11 ... Management part 12 ... Connection part 13 ... Transfer part 100 ... S-CSCF
200… AS / MRF (transfer)
300… AS / MRF (RBT)
400 ... S-CSCF

Claims (4)

In a ring tone providing auxiliary device that operates on an AS / MRF (Application Server / Media Resource Function) or S-CSCF (Serving Call Session Control Function) device,
Regarding the call from the calling terminal, whether or not the transfer guidance of the call is transmitted to the calling terminal according to the progress of the call processing by the device , and the early media information of SIP (Session Initiation Protocol) after the transmission of the transfer guidance. Whether or not has been transmitted to the calling terminal, a management unit that manages in a management table for each call,
Refers to the management table, the call from the calling terminal, the timing of the destination terminal to the previous presence of the incoming call response 200OK, the after transmission of the transfer guidance early if the media information is not transmitted to the calling terminal , connected to the ring back tone output device to send the early media information to the calling terminal, and a connection unit for transmitting a ringing tone to the calling terminal to the ring back tone output device,
A ring tone providing auxiliary device, comprising: After receiving the early media information according to the ring tone from the ringing tone output unit, the transfer unit to send an UPDATE request setting the SDP (Session Description Protocol) contained in the early media information to the calling terminal,
The ringing tone providing assistance device according to claim 1, further comprising: A ring tone providing assisting method performed by a ring tone assisting device operating on an AS / MRF (Application Server / Media Resource Function) or S-CSCF (Serving Call Session Control Function) device .
The ringtone providing auxiliary device,
As to the call from the calling terminal, whether or not the transfer guidance of the call has been transmitted to the calling terminal according to the progress of the call processing by the device , and the early media information of SIP (Session Initiation Protocol) after the transmission of the transfer guidance Whether or not has been transmitted to the calling terminal, a step of managing in a management table for each call,
Refers to the management table, the call from the calling terminal, the timing of the destination terminal to the previous presence of the incoming call response 200OK, the after transmission of the transfer guidance early if the media information is not transmitted to the calling terminal , connected to the ring back tone output device to send the early media information to the calling terminal, a step of transmitting a ringing tone to the calling sound output apparatus to the master station,
Performing a ringing tone provision assisting method.   A ring tone providing auxiliary program for causing a computer to function as the ring tone providing auxiliary device according to claim 1 or 2.

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