WO2022009251A1 - Call control system, enum server, voice recording server, call control device, call control method, and program - Google Patents

Abstract

A call control system according to the present invention comprises a call control device 30, an ENUM server 10 and a voice recording server 20. The call control device 30 has: a setting unit 32 that sets the telephone number of a calling source into an ENUM query for transmission to the ENUM server 10; and a call control unit 31 that transmits a calling signal on the basis of connection destination information. The ENUM server 10 has: a voice recording flag 11 that indicates whether or not the telephone number is to be voice-recorded; a determination unit 12 that determines whether or not the telephone number of the destination or of the calling source shown in the ENUM query is to be voice-recorded; and a query reception unit 13 that, in a case of the telephone number shown in the ENUM query being to be voice-recorded, returns the connection destination information to which a subdomain has been given for passage through the voice recording server 20. The voice recording server 20 has: a rewriting unit 21 that, upon receipt of the calling signal, rewrites and forwards the calling signal such that the path of media transmitted and received between terminals passes through the voice recording server 20; and a voice recording unit 22 that voice-records the media.

Description

Call control system, ENUM server, recording server, call control device, call control method, and program

The present invention relates to a call control system, an ENUM server, a recording server, a call control device, a call control method, and a program.

U-plane Real-time Transport Protocol (RTP) packets (hereinafter referred to as media) for failure analysis when voice is interrupted or FAX cannot be transmitted in inter-operator communication via IP interconnection. Is required to obtain.

Conventionally, when a call control signal is transmitted / received on the C plane, it is determined whether or not the call is to be recorded based on the subscriber data held by the Server Call Session Control Function (S-CSCF) or the like, and the call is to be recorded. In the case of the call, the media was routinely routed through the recording server.

TTC Standard JJ-90.31, "Carrier ENUM Interconnection Common Interface", Telecommunication Technology Committee, August 29, 2018, 4.0th Edition

However, in the Signaling Gateway (SGW) that does not retain the subscriber data, it is difficult to determine whether or not the call is a recording target. The SGW is a device that converts a call control signal at the boundary between a circuit-switched network and an IP network.

The present invention has been made in view of the above, and an object of the present invention is to provide a method capable of easily acquiring media in a call control system.

The call control system of one aspect of the present invention is a call control system including a call control device, an ENUM server, and a recording server, and the call control device receives a transmission signal from a terminal and has a destination telephone number. The telephone number of the caller is set in the inquiry of the connection destination information, and the transmission signal is transmitted based on the connection destination information indicated by the setting unit for transmitting the inquiry to the ENUM server and the response from the ENUM server. The ENUM server has a call control unit, and the ENUM server refers to a recording flag indicating whether or not a telephone number is a recording target, and the recording flag when the inquiry is received, and the telephone number of the destination of the inquiry. Alternatively, a determination unit for determining whether or not the caller's telephone number is the recording target, and a subdometon so as to go through the recording server when the telephone number of the destination of the inquiry or the caller's telephone number is the recording target. It has an inquiry unit that returns the added connection destination information, and when the recording server receives the transmission signal, the transmission signal is transmitted so that the path of the media transmitted and received between the terminals passes through the recording server. It has a rewriting unit for rewriting and transferring, and a recording unit for recording the media.

According to the present invention, it is possible to provide a method capable of easily acquiring media in a call control system.

FIG. 1 is a diagram showing an example of the configuration of the call control system of the present embodiment. FIG. 2 is a diagram showing an example of the configuration of each device of the call control system. FIG. 3 is a sequence diagram showing a processing flow of the call control system when making a call from a terminal of the own network. FIG. 4 is a sequence diagram showing a processing flow of the call control system when an incoming call is received from a terminal of another business operator. FIG. 5 is a diagram showing an example of the hardware configuration of each device constituting the call control system.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing an example of the configuration of the call control system of the present embodiment. In the figure, a device that mainly transmits and receives a call control signal is shown, and a recording server described later is not shown.

The Interconnection Border Control Function (IBCF) 40 is a gateway between the interconnection partner business A or the business Z, and transfers a call control signal (SIP message) and media at the boundary between the business networks.

E. 164 NUMber Mapping (ENUM) server 10 returns the connection destination information corresponding to the telephone number in response to the inquiry. The ENUM server 10 of the present embodiment has a function of determining whether or not the call is a recording target, and in the case of a recording target call, a subdomain for routing the media to a recording server (not shown). The connection destination information with the above is returned.

S-CSCF connects to the terminal via an edge router. The SGW connects to the terminal via a switch. The SGW converts a conventional telephone call control signal into a SIP message. Hereinafter, both S-CSCF and SGW will be referred to as a call control device 30. When making a call from the terminal of the own network to the terminal of the business operator A or the business operator Z, the call control device 30 sets the telephone number of the caller in the additional information of the inquiry to the ENUM server 10.

With reference to FIG. 2, the configurations of the ENUM server 10, the recording server 20, and the call control device 30 of the present embodiment will be described.

First, the configuration of the call control device 30 will be described. The call control device 30 includes a call control unit 31 and a setting unit 32.

The call control unit 31 sends and receives call control signals. When making a call from the own network, the ENUM server 10 is inquired about the connection destination information corresponding to the destination telephone number, and the call control signal is transmitted based on the returned connection destination information. When the call control device 30 is an SGW, the call control unit 31 converts an outgoing call from a terminal of its own network into a SIP message and sends it, or converts a SIP message to a terminal of its own network to a terminal of its own network. Incoming calls.

The setting unit 32 sets the telephone number of the sender in the additional information when inquiring the telephone number of the destination to the ENUM server 10. For example, the setting unit 32 sets the telephone number of the caller in the RDATA field of the additional information unit of the ENUM message.

Next, the configuration of the ENUM server 10 will be described. The ENUM server 10 includes a recording flag 11, a determination unit 12, and an inquiry unit 13.

The recording flag 11 is information for determining a call to be recorded. The recording flag 11 is, for example, a flag set for the telephone number to be recorded. The ENUM server 10 has a telephone number and a database that holds connection destination information corresponding to the telephone number.

The determination unit 12 determines whether or not the telephone number of the destination inquired by the ENUM query or the telephone number of the sender set in the additional information is the recording target.

The inquiry unit 13 returns an ENUM answer containing the connection destination information corresponding to the destination telephone number in response to the inquiry by the ENUM query. At this time, if the determination unit 12 determines that the destination telephone number or the caller's telephone number is the recording target, the inquiry unit 13 assigns the connection destination information a subdomain for routineizing to the recording server 20. ..

Next, the configuration of the recording server 20 will be described. The recording server 20 includes a rewriting unit 21 and a recording unit 22.

Upon receiving the call control signal, the rewriting unit 21 deletes the subdomain assigned by the ENUM server 10 from the call control signal, and the Session Description Protocol (SDP) in the call control signal so that the media passes through the recording server 20. Is rewritten to transfer the call control signal to the destination.

The recording unit 22 records the media to be recorded when the communication path via the recording server 20 is established between the source terminal and the destination terminal and the media is transmitted / received. The figure does not show the flow of media.

The IBCF 40 transfers the call control signal at the boundary between the operator networks. When an incoming call is received from another company to its own network, the IBCF 40 inquires of the ENUM server 10 for the destination telephone number. When the destination telephone number is the recording target, the ENUM server 10 returns an ENUM answer with a subdomain for routineizing to the recording server 20.

Next, with reference to FIG. 3, the flow of processing when making a call from the terminal A of the own network to the terminal B of another company will be described. It is assumed that the telephone number of the terminal A is set in the ENUM server 10 as a recording target.

In step S11, the terminal A transmits to the terminal B.

In step S12, the call control device 30 sends an ENUM query to the ENUM server 10 in order to inquire about the connection destination information of the terminal B. At this time, the call control device 30 sets the telephone number of the terminal A in the additional information of the ENUM query.

In step S13, the ENUM server 10 determines whether or not the telephone number of the terminal A set in the additional information is the recording target. When the telephone number of the terminal A is the recording target, a subdomain for routineizing to the recording server 20 is added to the connection destination information. For example, a subdometon (record) indicating the recording server 20 is assigned to another business domain indicating the connection destination of the terminal B.

In step S14, the ENUM server 10 returns the ENUM answer including the connection destination information of the terminal B to the call control device 30.

In step S15, the call control device 30 transmits an INVITE message to the recording server 20 according to the connection destination information obtained from the ENUM server 10. In the SDP, the terminal A is described as the destination of the media.

In step S16, the recording server 20 deletes the subdomain from the INVITE message received from the call control device 30, and transmits the INVITE message to the IBCF 40 at the boundary with the other business operator accommodating the destination terminal B. At this time, the recording server 20 rewrites the SDP so that the media goes through the recording server 20.

In step S17, the IBCF 40 transfers the INVITE message to the terminal B.

In step S18, the terminal B returns a response message.

In step S19, the IBCF 40 sends a response message to the recording server 20. In the SDP, IBCF40 is described as the destination of the media.

In step S20, the recording server 20 transmits a response message to the call control device 30. The recording server 20 rewrites the SDP so that the media goes through the recording server 20.

In step S21, the call control device 30 transmits a response message to the terminal A.

By the above processing, a communication path via the recording server 20 is established between the terminal A and the terminal B, and the recording server 20 can record media.

Next, with reference to FIG. 4, the flow of processing when making a call from the terminal B of another company to the terminal A of the own network will be described. It is assumed that the telephone number of the terminal A is set in the ENUM server 10 as a recording target.

In step S31, the terminal B transmits to the terminal A.

In step S32, the IBCF 40 sends an ENUM query to the ENUM server 10 in order for the call control device 30 to inquire about the connection destination information of the terminal A.

In step S33, the ENUM server 10 determines whether or not the telephone number of the destination terminal A is the recording target. When the telephone number of the terminal A is the recording target, a subdomain for routineizing to the recording server 20 is added to the connection destination information. For example, a subdomain (record) indicating the recording server 20 is added to the network domain indicating the connection destination of the terminal A.

In step S34, the ENUM server 10 returns the ENUM answer including the connection destination information of the terminal A to the IBCF 40.

In step S35, the IBCF 40 transmits an INVITE message to the recording server 20 according to the connection destination information obtained from the ENUM server 10. In the SDP, IBCF40 is described as the destination of the media.

In step S36, the recording server 20 deletes the subdomain from the INVITE message received from the IBCF 40, and transmits the INVITE message to the call control device 30 accommodating the destination terminal A. At this time, the recording server 20 rewrites the SDP so that the media goes through the recording server 20.

In step S37, the call control device 30 transmits an INVITE message to the terminal A.

In step S38, the terminal A returns a response message.

In step S39, the call control device 30 transmits a response message to the recording server 20. In the SDP, the terminal A is described as the destination of the media.

In step S40, the recording server 20 sends a response message to the IBCF 40. The recording server 20 rewrites the SDP so that the media goes through the recording server 20.

In step S41, the IBCF 40 transfers the response message to the terminal B.

By the above processing, a communication path via the recording server 20 is established between the terminal A and the terminal B, and the recording server 20 can record media.

As described above, the call control system of the present embodiment includes the call control device 30, the ENUM server 10, and the recording server 20. When the call control device 30 receives the outgoing signal from the terminal, the call control device 30 sets the calling source telephone number in the ENUM query for inquiring the connection destination information of the destination telephone number, and sends the ENUM query to the ENUM server 10. It has 32 and a call control unit 31 that transmits a transmission signal based on the connection destination information indicated by the response from the ENUM server 10. When the ENUM server 10 receives the recording flag 11 indicating whether or not the telephone number is the recording target and the ENUM query, the ENUM server 10 refers to the recording flag 11 and the telephone number or the sender of the destination described in the ENUM query. If the telephone number of the destination or the telephone number of the sender described in the ENUM query is the recording target, the subdometon so as to go through the recording server 20 and the determination unit 12 for determining whether or not the telephone number of is the recording target. It has an inquiry unit 13 for returning an ENUM answer including the connection destination information to which the above is added. The recording server 20 has a rewriting unit 21 that rewrites and transfers the transmission signal so that the path of the media transmitted and received between the terminals passes through the recording server 20 when the transmission signal is received, and a recording unit that records the media. Has 22. As a result, it is determined whether or not the ENUM server 10 is the recording target when making a call from the terminal of the own network or receiving a call to the terminal of the own network, and the media transmitted / received between the terminals passes through the recording server 20. Therefore, it is possible to provide a method that can easily acquire the media in the call control system.

The ENUM server 10, the recording server 20, and the call control device 30 described above include, for example, a central processing unit (CPU) 901, a memory 902, a storage 903, and a communication device 904 as shown in FIG. , A general-purpose computer system including an input device 905 and an output device 906 can be used. In this computer system, the ENUM server 10, the recording server 20, and the call control device 30 are realized by the CPU 901 executing a predetermined program loaded on the memory 902. This program can be recorded on a computer-readable recording medium such as a magnetic disk, an optical disk, or a semiconductor memory, or can be distributed via a network.

10 ... ENUM server 11 ... Recording flag 12 ... Judgment unit 13 ... Inquiry unit 20 ... Recording server 21 ... Rewriting unit 22 ... Recording unit 30 ... Call control device 31 ... Call control unit 32 ... Setting unit 40 ... IBCF

Claims (6)

A call control system equipped with a call control device, an ENUM server, and a recording server.
The call control device is
When a call signal is received from the terminal, the setting unit that sets the caller's phone number in the inquiry of the connection destination information of the destination phone number and sends the inquiry to the ENUM server, and
It has a call control unit that transmits the transmission signal based on the connection destination information indicated by the response from the ENUM server.
The ENUM server is
A recording flag that indicates whether the phone number is to be recorded,
When the inquiry is received, the recording flag is referred to, and a determination unit for determining whether or not the telephone number of the destination of the inquiry or the telephone number of the caller is the recording target, and
When the telephone number of the destination of the inquiry or the telephone number of the sender is the recording target, it has an inquiry unit for returning the connection destination information to which the subdometon is added so as to go through the recording server.
The recording server is
A rewriting unit that rewrites and transfers the transmitted signal so that the path of the media transmitted and received between the terminals passes through the recording server when the transmitted signal is received.
A call control system having a recording unit for recording the media. It ’s a call control device,
When a call signal is received from the terminal, the setting unit that sets the caller's phone number in the inquiry of the connection destination information of the destination phone number and sends the inquiry to the ENUM server,
A call control device having a call control unit that transmits the transmission signal based on the connection destination information indicated by the response from the ENUM server. It ’s an ENUM server,
A recording flag that indicates whether the phone number is to be recorded,
When an inquiry for connection destination information of the destination telephone number is received, the recording flag is referred to, and a determination unit for determining whether or not the destination telephone number or the caller's telephone number of the inquiry is to be recorded, and a determination unit.
An ENUM server having an inquiry unit that returns connection destination information to which a subdometon is added so as to go through a recording server that records media when the telephone number of the destination of the inquiry or the telephone number of the sender is the recording target. It ’s a recording server,
A rewriting unit that rewrites and transfers the transmitted signal so that the path of the media transmitted and received between the terminals passes through the recording server when the transmitted signal is received.
A recording server having a recording unit for recording the media. It is a call control method executed by the call control device, the ENUM server, and the recording server.
According to the call control device
When a call signal is received from the terminal, the step of setting the caller's phone number in the inquiry of the connection destination information of the destination's phone number and sending the inquiry to the ENUM server, and
It has a step of transmitting the transmission signal based on the connection destination information indicated by the response from the ENUM server.
According to the ENUM server
A step of referring to a recording flag indicating whether or not a telephone number is a recording target when the inquiry is received, and determining whether or not the telephone number of the destination of the inquiry or the telephone number of the caller is the recording target. When,
If the telephone number of the destination of the inquiry or the telephone number of the sender is the recording target, the step includes a step of returning the connection destination information to which the subdometon is added so as to go through the recording server.
According to the recording server
A step of rewriting and transferring the transmission signal so that the path of the media transmitted and received between the terminals passes through the recording server when the transmission signal is received.
A call control method comprising the step of recording the media. A program that operates a computer as each part of the call control device, the ENUM server, or the recording server included in the call control system according to claim 1.

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