JP7061929B2 - Call control system - Google Patents

Description

One aspect of the present invention relates to a call control system.

Conventionally, a computer system for recording a call has been known. For example, in Patent Document 1, for a voice call determined to be a recording target by the voice communication control device, the voice packet is duplicated, and the voice packet duplicated to the voice recording device designated as the recording destination of the customer regarding the voice call is reproduced. A call recording system comprising a voice relay duplication device for transmission is described.

Japanese Unexamined Patent Publication No. 2010-283576

A phenomenon may occur in which a call cannot be reliably recorded due to a delay in a control signal in a call control system. For example, in a call recording system in which a core network is constructed with an IMS (IP Multimedia Subsystem) network using a communication protocol called SIP (Session Initiation Protocol), a call is made when the transmitting terminal receives a 200_OK message (answer signal). It will be started. Then, when the core network acquires the ACK message (confirmation signal) transmitted from the calling terminal, the recording of the call is started. In this mechanism, if the ACK message is significantly delayed, a time lag may occur between the 200_OK message and the ACK message, and the start of recording may be delayed or the recording may not be started.

Therefore, it is desired to reliably record the call from the beginning.

The call control system according to one aspect of the present invention includes a call control unit that controls a call between a calling terminal and an incoming terminal, and a recording control unit that controls recording of a call, and the call control unit is a calling terminal. Suppressing the call in response to the answer signal transmitted from the incoming terminal that received the call establishment request signal from, and canceling the suppression of the call in response to the confirmation signal transmitted from the calling terminal that received the answer signal. Then, the call is enabled, and the recording control unit responds to the confirmation signal and starts recording the call.

In such an aspect, in response to the confirmation signal from the calling terminal, the call becomes possible and the recording of the call is started. With this mechanism, the start timing of the call and recording is matched, so that the call can be reliably recorded from the beginning.

According to one aspect of the present invention, a call can be reliably recorded from the beginning.

It is a figure which shows an example of the whole structure of the call control system which concerns on embodiment. It is a figure which shows an example of the functional structure of some communication control apparatus which concerns on embodiment. It is a sequence diagram which shows an example of the operation of the call control system which concerns on embodiment. It is a sequence diagram which shows an example of the operation of the call control system which concerns on embodiment. It is a sequence diagram which shows an example of the operation of the conventional call control system. It is a sequence diagram which shows an example of the operation of the conventional call control system. It is a figure which shows an example of the hardware composition of the computer used for the communication control device which concerns on embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or equivalent elements are designated by the same reference numerals, and duplicate description will be omitted.

The call control system is a computer system that controls a call between a calling terminal and an incoming terminal. A call is a communication path temporarily occupied between a calling terminal and an incoming terminal. The calling terminal is a communication terminal that first requests a call connection, and the incoming terminal is a communication terminal that responds to the call connection request. By establishing a call between these two communication terminals, the caller (user of the calling terminal) and the called party (user of the receiving terminal) can talk. The call means the voice transmitted and received between the outgoing terminal and the incoming terminal, and also means the transmission and reception of the voice between the outgoing terminal and the incoming terminal.

In this embodiment, the call control system also has a function of recording a call. Call recording is a process of storing voice data (voice signals) constituting a call in a recording medium. The recording of the call allows the user (eg, the caller or the called party) to re-listen to the call later.

FIG. 1 is a diagram showing an overall configuration of a call control system 1 according to an embodiment. The call control system 1 includes a calling side network 21 in which the calling terminal 31 is located, a calling side network 22 in which the receiving terminal 32 is located, and a core network 10 connecting the calling side network 21 and the called side network 22. .. In the call control system 1, a call (communication path) is established by transmitting a control signal between a plurality of devices and terminals, and a data signal indicating voice is transmitted via the call to make a call. It will be possible.

Both the calling terminal 31 and the receiving terminal 32 are communication terminals having a call function. Examples of the calling terminal 31 and the receiving terminal 32 include, but are not limited to, mobile phones, fixed phones, smartphones, tablet terminals, wearable terminals, and personal computers. The type of the terminal may be the same or different between the outgoing terminal 31 and the incoming terminal 32.

Both the originating network 21 and the arriving network 22 are access networks to which terminals are directly connected. The configuration of the access network is not limited. For example, the access network may be any wireless or wired network. The type (protocol) of the access network may be the same or different between the originating network 21 and the arriving network 22.

The core network 10 is a network that forms the core of the call control system 1 and includes various communication control devices. In this embodiment, it is assumed that the core network 10 is an IMS network. The IMS network is a network that uses SIP as a communication protocol and can provide a multimedia service that realizes real-time communication of voice or video as well as data communication. In the IMS network, calls are processed by a plurality of communication control devices such as a call session control function (CSCF: Call Session Control Function), an application server (AS: Application Server), a gateway, and a subscriber management function (HSS: Home Subsystem Server). Will be done. A CSCF is a device that sets up a call or session and activates a predetermined service. The application server is a device that executes a predetermined service (for example, recording a call) and determines whether or not the service can be executed. A gateway is a device that connects an access network and a core network. The HSS is a device (database) that stores a user's profile (subscriber information).

FIG. 1 shows a communication control device particularly related to recording a call, specifically, a calling side CSCF11, a destination side CSCF12, a destination side AS13, a billing server 14, a distribution server 15, a recording control device 16, and a recording. The device 17 is shown. In the following, the recording of the call will be described in detail.

Both the calling side CSCF11 and the arriving side CSCF12 execute call control for communicating and connecting the outgoing terminal 31 and the incoming terminal 32. By transmitting and receiving a control signal and a data signal (for example, voice data) between the originating side CSCF11 and the arriving side CSCF12, the originating side network and the arriving side network are interconnected. The arrival side AS13 is an application server in the arrival side network. The billing server 14 is an application server that executes billing for a call. The distribution server 15 is an application server that executes control such as service distribution and conflict processing. The recording control device 16 is an application server that controls the recording of a call. The recording device 17 is a computer that stores audio data in a storage (recording medium) 18. In FIG. 1, the storage 18 is independent of the recording device 17, but the installation location of the storage 18 is not limited. For example, the storage 18 may be provided in the recording device 17, or may be constructed on a computer different from the recording device 17.

FIG. 2 is a diagram showing a functional configuration of a billing server 14, a recording control device 16, and a recording device 17, which will be particularly described in the present embodiment.

The billing server 14 includes a signal processing unit 141 and a billing control unit 142 as functional elements. The signal processing unit 141 is a functional element that executes various processes for control signals and data signals, and for example, acquires and relays these signals. The billing control unit 142 is a functional element that executes billing for a call.

The recording control device 16 includes a signal processing unit 161 and a call / recording control unit 162 as functional elements. The signal processing unit 161 is a functional element that executes various processes for control signals and data signals, and for example, acquires and relays these signals. The call / recording control unit 162 is a functional element that controls a call between the calling terminal 31 and the incoming terminal 32 and recording of the call, and more specifically, in order to match the start timing of the call and recording. To control. In the present embodiment, the call / recording control unit 162 functions as a call control unit and a recording control unit.

The recording device 17 includes a resource control unit 171 as a functional element. The resource control unit 171 is a functional element that controls media resources according to instructions from the recording control device 16 (more specifically, the call / recording control unit 162). A media resource is a mechanism for executing various services or processes on voice data constituting a call. In this embodiment, the media resource is used to store voice data in the storage 18 (ie, to record a call). The method of constructing the media resource is not limited, and for example, it may be constructed using at least one of software and hardware resources such as a processor and a memory.

Each communication control device such as the billing server 14, the recording control device 16, and the recording device 17 is configured by using at least one computer. When a plurality of computers are used, one communication control device is logically constructed by connecting these computers to each other via a communication network.

An example of the operation of the call control system 1 according to the present embodiment will be described with reference to FIGS. 3 and 4. 3 and 4 are both sequence diagrams showing an example of the operation of the call control system 1. FIG. 3 shows an example in which the call establishment succeeds, and FIG. 4 shows an example in which the call establishment finally fails.

For ease of understanding, FIGS. 3 and 4 show only components and data signals that are particularly relevant to the control of calls and recordings. In SIP, first, the calling terminal 31 transmits an INVITE message in response to a user's calling operation. The INVITE message is a control signal (call establishment request signal) transmitted to establish a call (session) between the transmitting terminal 31 and the incoming terminal 32. This INVITE message enters the core network 10 via the originating network 21. In the core network 10, the INVITE message is sequentially transferred to the billing server 14 and the recording control device 16 while passing through the calling side CSCF 11 each time. After that, the INVITE message is transferred from the originating CSCF11 to the arriving CSCF12. Finally, the INVITE message is transmitted from the incoming CSCF 12 to the incoming terminal 32 via the incoming network 22. When the called terminal 32 receives the INVITE message, the call process for the called terminal 32 is completed. Both of the examples shown in FIGS. 3 and 4 presuppose these processes related to INVITE messages.

First, an example in which a call is successfully established and a call and a recording are executed will be described with reference to FIG.

In step S11, the resource control unit 171 of the recording device 17 generates a media resource in response to the INVITE message. In the recording control device 16, in response to the signal processing unit 161 receiving the INVITE message, the call / recording control unit 162 transmits a generation instruction, which is a signal for instructing the generation of the media resource, to the recording device 17. do. In response to the generation instruction, the resource control unit 171 generates a media resource corresponding to the call to be established. This is an example of a process in which the call / recording control unit 162 generates a media resource in response to an INVITE message (call establishment request signal). The media resource is generated to prepare the call for recording, but in the present embodiment, the recording actually starts after this point.

In step S12, the incoming terminal 32 that has received the INVITE message sends a 200_OK message in response to the callee answering the call. The 200_OK message is a control signal (answer signal) indicating that the call establishment request by the INVITE message is successful. This 200_OK message enters the core network 10 via the arrival side network 22 and is transferred from the arrival side CSCF12 to the origination side CSCF11.

In step S13, the calling side CSCF 11 transfers the 200_OK message to the recording control device 16. In the recording control device 16, the signal processing unit 161 receives the 200_OK message.

In step S14, the call / recording control unit 162 of the recording control device 16 starts the timer in response to the 200_OK message. This timer is used to determine if a call is established within a SIP predetermined time limit (eg, within 32 seconds).

In step S15, the call / recording control unit 162 sends a disconnection instruction to the recording device 17 in response to the 200_OK message. The disconnection instruction is a signal for temporarily disconnecting the media resource.

In step S16, the resource control unit 171 of the recording device 17 disconnects the media resource in response to the disconnection instruction. Disconnecting a media resource means temporarily disabling the generated media resource. By disconnecting the media resource, even if the voice data is input, the voice data is discarded without being stored in the storage 18. Therefore, the flow of voice data is cut off here.

In step S17, the signal processing unit 161 of the recording control device 16 returns the 200_OK message to the calling side CSCF11. In this process, the signal processing unit 161 also transmits the additional header by associating the additional header with the 200_OK message. The additional header is an identifier indicating the use of call recording in the present embodiment.

In step S18, the originating CSCF 11 transfers the 200_OK message associated with the additional header to the billing server 14. In the billing server 14, the signal processing unit 141 receives the 200_OK message.

In step 19, the charge control unit 142 of the charge server 14 starts the timer in response to the 200_OK message. This timer is used to determine if a call is established within a SIP predetermined time limit (eg, within 32 seconds).

In step S20, the billing control unit 142 starts the billing process in response to the 200_OK message. This billing process is confirmed when the call ends normally. Further, the charge control unit 142 recognizes that the call to be charged is the target of call recording based on the additional header sent together with the 200_OK message.

In step S21, the signal processing unit 141 of the billing server 14 returns the 200_OK message to the calling side CSCF11, and the calling side CSCF11 transfers the 200_OK message to the transmitting terminal 31.

In step S22, when the transmitting terminal 31 receives the 200_OK message, a U-Plane (user plain) bus for transmitting a data signal is established between the transmitting terminal 31 and the receiving terminal 32. However, since the recording device 17 (resource control unit 171) disconnected the media resource based on the disconnection instruction transmitted by the recording control device 16 (call / recording control unit 162) in response to the 200_OK message, the call terminal 31 and the call terminal 31 The communication path with the incoming terminal 32 is cut off in the middle. Therefore, voice connection (voice transmission) between these two terminals is not possible.

The process of intentionally blocking the transmission of voice between the calling terminal 31 and the receiving terminal 32 in this way is referred to as "call suppression" or "call suppression". As mentioned above, call suppression is achieved by disconnecting media resources. This disconnection process is realized by the resource control unit 171 controlling the media resource according to the disconnection instruction transmitted from the call / recording control unit 162 in response to the 200_OK message. This is an example of a process in which the call / recording control unit 162 suppresses a call by disconnecting a media resource in response to a 200_OK message (answer signal).

In step S23, the transmitting terminal 31 that has received the 200_OK message transmits an ACK message, and this ACK message is sequentially transferred to the billing server 14 and the recording control device 16 via the calling side CSCF11. In the recording control device 16, the signal processing unit 161 acquires an ACK message. After that, the ACK message is transmitted from the originating CSCF 11 to the incoming terminal 32 via the arriving CSCF 12. The ACK message is a control signal (acknowledgement signal) indicating that the response by the 200_OK message was successful.

In step S24, the call / recording control unit 162 of the recording control device 16 transmits a recording start instruction to the recording device 17 in response to the ACK message acquired by the signal processing unit 161. The recording start instruction is a signal for starting recording of a call.

In step S25, the resource control unit 171 of the recording device 17 reconnects the media resource in response to the recording start instruction. Reconnecting a media resource means re-enabling a temporarily disabled (ie, disconnected) media resource. By reconnecting the media resource, the voice data can be stored in the storage 18, and the voice data flows toward the destination (outgoing terminal 31 or incoming terminal 32).

In step S26, the media resource is reconnected, so that the communication path between the transmitting terminal 31 and the receiving terminal 32 is connected, and voice connection (voice transmission) becomes possible via the U-Plane bus. The process of enabling the transmission of voice between the outgoing terminal 31 and the incoming terminal 32, which has been intentionally blocked, is called "release of call suppression" or "release of call suppression". This release process enables a call. Further, by reconnecting the media resource, the recording device 17 can acquire the audio data and store it in the storage 18.

In this way, the deterrence of the call and the start of recording of the call are realized by reconnecting the media resources. This reconnection process is realized by the resource control unit 171 controlling the media resource according to the recording start instruction transmitted from the call / recording control unit 162 in response to the ACK message. This is an example of a process in which the call / recording control unit 162 responds to an ACK message (confirmation signal) and reconnects the media resource to release the call suppression and start recording the call. Since the release of the call suppression and the start of recording are executed before the respective timers of the recording control device 16 and the billing server 14 reach the time limit, the processing due to the time out is not executed.

In step S27, the call / recording control unit 162 of the recording control device 16 transmits guidance (guidance message) regarding recording of the call to the calling terminal 31.

In step S28, a call is made between the calling terminal 31 and the receiving terminal 32, and the call is recorded. As described above, both the deterrence of the call and the recording of the call are executed in response to the ACK message, so that these two processes are started simultaneously or almost simultaneously. Therefore, the call is reliably recorded from the beginning.

Next, with reference to FIG. 4, an example of processing when the call establishment fails will be described. The processing of steps S31 to S42 shown in FIG. 4 is the same as the processing of steps S11 to S22 in FIG. However, in the example of FIG. 4, the core network 10 does not acquire the ACK message from the transmitting terminal 31. In this case, the timers of the recording control device 16 and the billing server 14 reach a predetermined time limit. In this abnormal state in which the ACK message is not acquired from the suppression of the call to the elapse of the time limit, the call control system 1 operates as follows.

In step S43 after step S42, the call / recording control unit 162 of the recording control device 16 transmits a BYE message to the transmitting terminal 31 in response to the time-out. The BYE message is a control signal (call disconnection request signal) transmitted to disconnect the call (session). The call / recording control unit 162 transmits a BYE message without reconnecting the media resource disconnected in step S36. That is, the call / recording control unit 162 disconnects the call between the outgoing terminal 31 and the incoming terminal 32 without releasing the suppression of the call. As a result, no calls or recordings are made. In response to the disconnection of the call, the resource control unit 171 of the recording device 17 discards the disconnected media resource without reconnecting.

In step S44, the billing control unit 142 of the billing server 14 cancels the billing process in response to the time out. Since the billing control unit 142 has already recognized that the call to be processed is the target of call recording, it can determine whether or not to cancel the billing. The billing control unit 142 cancels the billing process by skipping the generation of the details corresponding to the call that is the target of the call recording. Due to such non-billing processing, no billing is generated for a call that cannot be made.

As described above, in the present embodiment, the process of adjusting the timing of the call and the recording is executed. Further, in the case of an abnormal state, the call is disconnected without canceling the call suppression, recording is not started, and no charge is generated.

On the other hand, in the prior art, the timing at which the call is possible and the timing at which the recording starts are different, so that a phenomenon in which the call cannot be recorded may occur. In addition, a charge will be incurred for the call. In order to show the difference between the present embodiment and the prior art, an example of the operation of the conventional call control system will be described with reference to FIGS. 5 and 6. 5 and 6 are both sequence diagrams showing an example of the operation of the prior art. FIG. 5 shows an example in which the call establishment succeeds, and FIG. 6 shows an example in which the call establishment finally fails.

First, an example in which a call is successfully established and a call and a recording are executed will be described with reference to FIG.

In step S71, the receiving terminal that has received the INVITE message sends a 200_OK message in response to the callee answering the call. This 200_OK message enters the core network via the arrival side network and is transferred from the arrival side CSCF to the origination side CSCF. In step S72, a 200_OK message is transmitted / received between the originating CSCF and the recording control device, and in step S73, the originating CSCF transmits the 200_OK message to the billing server. In step S74, the billing server responds to the 200_OK message and starts the billing process. In step S75, the billing server returns the 200_OK message to the originating CSCF, and the originating CSCF transfers the 200_OK message to the calling terminal. In step S76, when the calling terminal receives the 200_OK message, a U-Plane bus is established between the calling terminal and the receiving terminal. In the prior art, voice connection (voice transmission) is possible between the outgoing terminal and the incoming terminal at this point.

In step S77, the transmitting terminal that has received the 200_OK message transmits an ACK message, and this ACK message is sequentially transferred to the billing server and the recording control device via the originating CSCF. After that, the ACK message is transmitted from the originating CSCF to the incoming terminal via the arriving CSCF. In step S78, the recording control device sends a recording start instruction to the recording device in response to the ACK message. In step S79, the recording device generates a media resource in response to the recording start instruction, which enables recording of the call. In step S80, the recording control device transmits guidance (guidance message) regarding recording of the call to the calling terminal. In step S81, a call is made between the calling terminal and the receiving terminal, and the call is recorded by the recording device.

Next, with reference to FIG. 6, an example of processing when the call establishment fails will be described. The processing of steps S91 to S96 shown in FIG. 6 is the same as the processing of steps S71 to S76 in FIG. However, in the example of FIG. 6, the core network does not acquire the ACK message from the calling terminal. In this case, in step S97, the call is disconnected in response to the elapse of the time limit determined by SIP, and in step S98, the billing server confirms the billing. Therefore, in the prior art, although a call can be made for a short time, the call is disconnected without being recorded, and a call charge is incurred.

A phenomenon may occur in which a call cannot be reliably recorded due to a delay in a control signal in a call control system. In the prior art, when a core network is constructed with an IMS network, a call is started when the calling terminal receives a 200_OK message. Then, when the core network acquires the ACK message transmitted from the calling terminal, the recording of the call is started. In this mechanism, if the ACK message is significantly delayed, as shown in FIG. 6, a time lag may occur between the 200_OK message and the ACK message, and the start of recording may be delayed or the recording may not be started.

Communication terminals compatible with VoLTE (Voice over LTE, Voice over Long Term Evolution) that are on the market recently are equipped with a SIP stack. This means that the range of SIP control extends to the terminal. In addition, as for such communication terminals, products independently developed by OTT (Over The Top) players (businesses other than telecommunications carriers that provide messages, voices, videos, etc.) are on the market. Therefore, a situation may occur in which the telecommunications carrier (so-called communication carrier) cannot control the operation of such a communication terminal. One of them is the time lag between the 200_OK message and the ACK message. In such a situation, the telecommunications carrier cannot identify whether the cause of the delay in the ACK message is the communication terminal or the communication line.

By introducing the call control system 1 according to the present embodiment, the timing at which a call is possible and the timing at which recording is started are matched, so that the above-mentioned new problem can be solved.

In the present embodiment, the core network 10 is an IMS network, but the call control system according to the present invention may be applied to any kind of core network. In this regard, the call control system according to the present invention may use a communication protocol other than SIP. For example, the call control system according to the present invention may be applied to an SS7 network (SS7: Signaling System No. 7) configured to include an ISUP (ISDN user unit).

In the present embodiment, the recording control device 16 and the recording device 17 are logically separate devices, but these two servers may be logically integrated as one device.

In the present embodiment, the billing server 14 cancels the billing in response to the time out, but this non-billing process is not essential.

The block diagram used in the description of the above embodiment shows a block of functional units. These functional blocks (components) are realized by any combination of hardware and / or software. Further, the means for realizing each functional block is not particularly limited. That is, each functional block may be realized by one physically and / or logically coupled device, or directly and / or indirectly by two or more physically and / or logically separated devices. It may be connected specifically (eg, wired and / or wireless) and realized by these plurality of devices.

For example, the communication control device according to the embodiment of the present invention may function as a computer that performs the processing of the present embodiment. FIG. 7 is a diagram showing an example of a hardware configuration of a computer 100 that functions as the communication control device (for example, a billing server 14, a recording control device 16, or a recording device 17). The computer 100 may physically include a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

In the following description, the word "device" can be read as a circuit, a device, a unit, or the like. The hardware configuration of the recording control device 16 may be configured to include one or more of the devices shown in the figure, or may be configured not to include some of the devices.

For each function in the recording control device 16, by loading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, the processor 1001 performs an operation, and communication by the communication device 1004, the memory 1002, and the storage are performed. It is realized by controlling the reading and / or writing of data in 1003.

The processor 1001 operates, for example, an operating system to control the entire computer. The processor 1001 may be composed of a central processing unit (CPU) including an interface with a peripheral device, a control device, an arithmetic unit, a register, and the like. For example, at least a part of the functional elements of the recording control device 16 may be realized by the processor 1001.

Further, the processor 1001 reads a program (program code), a software module and data from the storage 1003 and / or the communication device 1004 into the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiment is used. For example, at least a part of the functional elements of the recording control device 16 may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and may be realized for other functional blocks as well. Although it has been described that the various processes described above are executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. Processor 1001 may be mounted on one or more chips. The program may be transmitted from the network via a telecommunication line.

The memory 1002 is a computer-readable recording medium, and is composed of at least one such as a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), and a RAM (Random Access Memory). May be done. The memory 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, or the like that can be executed to implement the wireless communication method according to the embodiment of the present invention.

The storage 1003 is a computer-readable recording medium, and is, for example, an optical disk such as a CDROM (Compact Disc ROM), a hard disk drive, a flexible disk, a photomagnetic disk (for example, a compact disk, a digital versatile disk, or a Blu-ray (registration)). It may consist of at least one such as a (trademark) disk), a smart card, a flash memory (eg, a card, stick, key drive), a floppy (registered trademark) disk, a magnetic strip, and the like. The storage 1003 may be referred to as an auxiliary storage device. The storage medium described above may be, for example, a table, server or other suitable medium containing memory 1002 and / or storage 1003.

The communication device 1004 is hardware (transmission / reception device) for communicating between computers via a wired and / or wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like. For example, at least a part of the functional elements of the recording control device 16 may be realized by the communication device 1004.

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

Further, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be composed of a single bus or may be composed of different buses between the devices.

Further, the computer 100 is configured to include hardware such as a microprocessor, a digital signal processor (DSP: Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), a PLD (ProgrammableLogic Device), and an FPGA (Field Programmable Gate Array). The hardware may implement some or all of each functional block. For example, the processor 1001 may be implemented on at least one of these hardware.

As described above, the call control system includes a call control unit that controls a call between the calling terminal and the incoming terminal, and a recording control unit that controls the recording of the call. By suppressing the call in response to the answer signal transmitted from the incoming terminal that received the call establishment request signal, and canceling the call suppression in response to the confirmation signal transmitted from the calling terminal that received the answer signal. , Enables the call, and the recording control unit responds to the confirmation signal and starts recording the call.

In such an aspect, in response to the confirmation signal from the calling terminal, the call becomes possible and the recording of the call is started. With this mechanism, the start timing of the call and recording is matched, so that the call can be reliably recorded from the beginning.

In the call control system according to the other aspect, the call control unit suppresses the call by disconnecting the media resource generated for recording the call, and cancels the call suppression by reconnecting the disconnected media resource. The recording control unit may start recording a call using the reconnected media resource. By controlling media resources in this way, it is possible to match the start timing of calls and recordings.

In the call control system according to the other aspect, the call control unit may generate media resources in response to the call establishment request signal. By generating the media resource in advance in response to the call establishment request signal transmitted before the response signal, the disconnection of the media resource can be executed immediately without causing a delay.

In the call control system according to the other aspect, in the case of an abnormal state in which the confirmation signal is not acquired within a predetermined time from the suppression of the call, the call control unit does not release the suppression of the call and the calling terminal. It is not necessary for the recording control unit to start recording the call in the case of an abnormal state by disconnecting the call between the and the incoming terminal. By this process, it is possible to reliably avoid a call and recording in an abnormal state.

The call control system according to the other aspect further includes a billing control unit that executes billing for a call, and even if the billing control unit executes a non-billing process for not generating a charge for a call in the case of an abnormal state. good. This process can reliably avoid the situation of charging the user without providing services related to calling and recording.

In the call control system according to the other aspect, the billing control unit responds to the answer signal and starts the billing process for the call, and in the case of an abnormal state, cancels the billing process to execute the non-billing process. May be good. By canceling the billing as necessary after starting the billing process once, it is possible to realize both the immediate confirmation of the billing in the normal case and the reliable avoidance of the billing in the abnormal state.

Although the present embodiment has been described in detail above, it is clear to those skilled in the art that the present embodiment is not limited to the embodiment described in the present specification. This embodiment can be implemented as an amendment or modification without departing from the spirit and scope of the present invention as determined by the description of the scope of claims. Therefore, the description of the present specification is for the purpose of illustration and does not have any limiting meaning to the present embodiment.

Notification of information is not limited to the embodiments and embodiments described herein, and may be performed by other methods. For example, information notification includes physical layer signaling (eg, DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer signaling (eg, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, etc. It may be carried out by broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof. Further, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

Each aspect / embodiment described herein includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Future Radio Access), W-CDMA. (Registered Trademarks), GSM (Registered Trademarks), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UWB (Ultra-Wideband), It may be applied to Bluetooth®, other systems that utilize suitable systems and / or next-generation systems that are extended based on them.

The processing procedures, sequences, flowcharts, and the like of each aspect / embodiment described in the present specification may be rearranged in order as long as there is no contradiction. For example, the methods described herein present elements of various steps in an exemplary order and are not limited to the particular order presented.

Information and the like can be output from the upper layer (or lower layer) to the lower layer (or upper layer). Input / output may be performed via a plurality of network nodes.

The input / output information and the like may be stored in a specific place (for example, a memory) or may be managed by a management table. Information to be input / output may be overwritten, updated, or added. The output information and the like may be deleted. The input information or the like may be transmitted to another device.

The determination may be made by a value represented by 1 bit (0 or 1), by a boolean value (Boolean: true or false), or by comparing numerical values (for example, a predetermined value). It may be done by comparison with the value).

Each aspect / embodiment described in the present specification may be used alone, in combination, or may be switched and used according to the execution. Further, the notification of predetermined information (for example, the notification of "being X") is not limited to the explicit one, but is performed implicitly (for example, the notification of the predetermined information is not performed). May be good.

Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or other names, is an instruction, instruction set, code, code segment, program code, program, subprogram, software module. , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, features, etc. should be broadly interpreted.

Further, software, instructions, and the like may be transmitted and received via a transmission medium. For example, the software uses wired technology such as coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL) and / or wireless technology such as infrared, wireless and microwave to websites, servers, or other When transmitted from a remote source, these wired and / or wireless technologies are included within the definition of transmission medium.

The information, signals, etc. described herein may be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may be represented by a combination of.

The terms described herein and / or the terms necessary for understanding the present specification may be replaced with terms having the same or similar meanings.

The terms "system" and "network" used herein are used interchangeably.

Further, the information, parameters, etc. described in the present specification may be represented by an absolute value, a relative value from a predetermined value, or another corresponding information. .. For example, the radio resource may be indexed.

The names used for the parameters mentioned above are not limited in any way. Further, mathematical formulas and the like using these parameters may differ from those expressly disclosed herein. Since the various channels (eg, PUCCH, PDCCH, etc.) and information elements (eg, TPC, etc.) can be identified by any suitable name, the various names assigned to these various channels and information elements are in any respect. However, it is not limited.

User terminals and mobile communication terminals may be used by those skilled in the art as subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, etc. It may also be referred to as a mobile device, wireless device, remote device, handset, user agent, mobile client, client, or some other suitable term.

As used herein, the terms "determining" and "determining" may include a wide variety of actions. “Judgment” and “decision” are, for example, judgment, calculation, computing, processing, deriving, investigating, and looking up (for example, a table). , Searching in a table or another data structure), ascertaining can be regarded as "judgment" or "decision". Further, "judgment" and "decision" are receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access. (Accessing) (for example, accessing data in memory) may be regarded as "judgment" or "decision". In addition, "judgment" and "decision" are considered to be "judgment" and "decision" when they are resolved, selected, selected, established, and compared. Can include. That is, "judgment" and "decision" may include considering some action as "judgment" and "decision".

The terms "connected", "coupled", or any variation thereof, mean any direct or indirect connection or connection between two or more elements and each other. It can include the presence of one or more intermediate elements between two "connected" or "joined" elements. The connection or connection between the elements may be physical, logical, or a combination thereof. As used herein, the two elements are by using one or more wires, cables and / or printed electrical connections, and, as some non-limiting and non-comprehensive examples, radio frequencies. By using electromagnetic energies such as electromagnetic energies with wavelengths in the region, microwave region and light (both visible and invisible) regions, they can be considered to be "connected" or "coupled" to each other.

The phrase "based on" as used herein does not mean "based on" unless otherwise stated. In other words, the statement "based on" means both "based only" and "at least based on".

As used herein by designations such as "first", "second", etc., any reference to that element does not generally limit the quantity or order of those elements. These designations can be used herein as a convenient way to distinguish between two or more elements. Thus, references to the first and second elements do not mean that only two elements can be adopted there, or that the first element must somehow precede the second element.

As long as "include", "including", and variations thereof are used herein or within the scope of the claims, these terms are similar to the term "comprising". In addition, it is intended to be inclusive. Moreover, the term "or" as used herein or in the claims is intended to be non-exclusive.

In the present specification, a plurality of devices shall be included unless the device has only one device apparently in context or technically.

1 ... Call control system, 10 ... Core network, 11 ... Origin side CSCF, 12 ... Arrival side CSCF, 13 ... Arrival side AS, 14 ... Billing server, 141 ... Signal processing unit, 142 ... Charge control unit, 15 ... Distribution Server, 16 ... Recording control device, 161 ... Signal processing unit, 162 ... Call / recording control unit (call control unit, recording control unit), 17 ... Recording device, 171 ... Resource control unit, 21 ... Origin network, 22 ... Arrival side network, 31 ... Outgoing terminal, 32 ... Incoming terminal.

Claims (5)

A call control unit that controls calls between outgoing and incoming terminals,
It is equipped with a recording control unit that controls the recording of the call.
The call control unit
In response to the answer signal transmitted from the incoming terminal that received the call establishment request signal from the calling terminal, the call is suppressed by disconnecting the media resource generated to record the call.
In response to the confirmation signal transmitted from the calling terminal that received the answer signal, the call is enabled by releasing the suppression of the call by reconnecting the disconnected media resource .
In response to the confirmation signal, the recording control unit starts recording the call using the reconnected media resource .
Call control system. The call control system according to claim 1 , wherein the call control unit generates the media resource in response to the call establishment request signal. In the case of an abnormal state in which the confirmation signal is not acquired by the time when a predetermined time elapses from the suppression of the call, the call control unit uses the calling terminal and the incoming terminal without canceling the suppression of the call. Disconnect the call between
In the case of the abnormal state, the recording control unit does not start recording the call.
The call control system according to claim 1 or 2 . Further provided with a billing control unit that executes billing for the call.
The billing control unit executes a non-billing process for preventing billing for the call in the case of the abnormal state.
The call control system according to claim 3 . The billing control unit
In response to the answer signal, the billing process for the call is started,
In the case of the abnormal state, the non-billing process is executed by canceling the billing process.
The call control system according to claim 4 .

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