KR20030057009A - VoIP Gateway Having Interactive Voice Response Function and Therefor Controlling Method - Google Patents

Abstract

PURPOSE: A VoIP gateway having an IVR(Interactive Voice Response) function and a control method therefor are provided to perform user authentication by using all IVRs for receiving/originating calls, and to enable a voice call for available users only, thereby resolving security vulnerability. CONSTITUTION: A VoIP gateway(500) comprises as follows. A trunk call processing block(510) interworks with an exchange(502). An IVR processing block(520) processes an IVR service. An Internet call processing block(540) processes an Internet call. A call control block(530) controls all calls, and manages resources. An IVR scenario table(560) stores a scenario for the IVR service. If a seizure request is transmitted from the exchange(502), a predetermined virtual telephone number is dialed to be connected with an IVR call interface. User authentication is performed. If a user is authenticated as an available user, an IVR function is provided.

Description

VOIP Gateway Having Interactive Voice Response Function and There for Controlling Method

The present invention provides a user authentication function and an incoming / outgoing call processing device and control thereof, which are services using an interactive voice response (hereinafter referred to as an IVR) using a virtual call in a VoIP (Voice over IP) gateway using the H.323 protocol. The present invention relates to a VoIP gateway and a method for enabling voice calls only for valid users after authenticating all of the incoming and outgoing signals using an internal IVR.

In general, the VoIP gateway converts the voice from the network into the packet network and the message from the packet network into the network. Major analog call processing interfaces that are frequently used to interwork with a network include FXS / FXO, and digital call processing interfaces include ISDN / R2, which is called digital trunk. FX refers to the extension of the 2-wire interface between the exchange and the phone. It is the interface commonly used in analog linked VoIP gateway. Voices enter the gateway through these call processing interfaces. Protocol H.323 that delivers the input voice to the packet network. The H.323 protocol is currently in the limelight as a protocol to complement / replace the network telephone network and is one of the important components of the gateway.

The configuration of a gateway for general call processing is as shown in FIG.

Referring to Figure 1, the digital call interface unit 110 is responsible for the digital call interface of the ISDN / R2, most of the voice processing in conjunction with the PBX. Up to 30 channels can be used when using the E1 line.

The analog call interface unit 120 (FXS / FXO) is responsible for the analog call interface, and can be directly connected to a switch or a telephone. FXS (Foreign ExchangeStation) works with Analog Trunk Card (ATC) of PBX / KTS, and Foreign Exchange Office (FXO) is the Analog Subscriber Line of PBX / KTS. It can be linked with: ASL).

The voice processor 140 (DSP) is responsible for compressing and reproducing voices received from the respective external call interface units 110 and 120 according to a predetermined codec.

The network interface unit 160 is responsible for sending voice packets to the packet network or receiving voice packets.

The call controller 170 is in charge of overall call control and makes a decision to refer to the call routing table so that the call can be routed to an appropriate destination. Analog has a simpler signaling procedure than digital. In particular, the FXS interface can be used by interlocking the phone without the exchange interworking, so it can be used as a substitute for a private exchange (PBX).

On the other hand, in the case of digital, call processing is generally complicated. In addition, there are some parts that differ slightly from country to country, and there are slightly different parts for each PBX to which they work.

Conventionally, most VoIP gateways do not provide IVR-related functions, and IVR services such as voice mailing service (VMS) and subscriber verification function are provided depending on an external server. This is an additional purchase that must be purchased when building a communications system in the enterprise. The VoIP gateway is only responsible for handing control over to incoming calls. The structure of the system for the existing IVR service requires an IVR server 210 separately from the VoIP gateway 200 as shown in FIG. 2.

Interactive Voice Response (IVR) is software that accepts a combination of voice telephony input and those that selectively press a button on a touch-phone telephone to provide an appropriate response in the form of voice, fax, e-mail or other media. IVR has been commonly used as part of large applications, including database access. With the proliferation of Internet telephony, IVR services, which are mainly used by CTI, have been introduced into VoIP gateways.

Referring to FIG. 2, the VoIP gateway 200 is a device that focuses on connecting the PSTN 10 and the packet network. In order to use the IVR service, only the function for interworking with the IVR server 210 inside or outside the PBX is used. Has been provided. In the outbound call processing process, when a call connection request is received from the PSTN 10, the gateway 200 is often connected to an external IVR server 210 by a network. The external IVR system responds and proceeds with the corresponding service. Inbound call processing process, when a call connection request is received from the network, connects to an Auto Attendant of a private exchange (PBX) to provide a function such as a telephone number guide or receive an call to an external IVR server 210. The user will proceed with the desired service.

As such, since voice processing is the main purpose of the conventional VoIP gateway, the IVR service was supported through an external server. Therefore, a small company may need to purchase a new system for simple IVR service. This is because the IVR service is provided by interworking with an external server without providing an IVR service inside the VoIP gateway. The external IVR server is connected to the internal network by TCP / IP. If many people use it, the VoIP gateway uses a lot of network, which adversely affects the VoIP call processing performance. In addition, in addition to the purpose of installing a VoIP gateway to reduce communication costs, additional costs are incurred due to the construction of additional systems.

Accordingly, an object of the present invention is to provide a VoIP gateway and a control method thereof that enable voice calls only for valid users after all user calls have been authenticated using an internal IVR.

The present invention for achieving this object is a trunk call processing unit for interworking with the exchange, the IVR call processing unit for the IVR service, the Internet call processing unit for processing the Internet call, the call in charge of control and resource management for all calls And at least a control unit.

The present invention also provides a procedure for receiving a Caesar recognition response from a switch at a gateway having an IVR function, performing a Caesar recognition response, dialing a predetermined virtual telephone number, and connecting to a mutual voice response call interface; Performing user authentication when connected to the mutual voice response call interface; If the user is authenticated as a valid user, at least the process of providing the mutual voice response service donation is performed.

The present invention also provides a process for connecting to a mutual voice response call interface when receiving a setup message from a network at a gateway having an IVR function; When connected to the mutual voice response call interface, transmitting ringback tones only internally, sending a standby message to the other party, and sending a connection message to the other party in a response state; When an incoming call is connected, performing user authentication on the incoming call; If the user is authenticated as a valid user, at least the process of providing the mutual voice response service donation is performed.

1 is a structural diagram of a general-purpose VoIP gateway.

2 is a structure diagram of an IVR service processing in a conventional VoIP gateway.

3 is a connection diagram of a VoIP IVR gateway.

4 is a structural diagram of a VoIP IVR gateway according to the present invention;

5 is a block diagram of a gateway system according to the present invention.

6 is a view showing a user authentication process using the IVR according to the present invention.

7 is a signaling procedure diagram for an IVR service according to the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The overall operating environment according to the invention is as shown in FIG.

In general, VoIP gateways exist between packet networks and PSTN networks, enabling voice calls. The present invention integrates basic VoIP gateway function and IVR function.

In the present invention, a virtual call interface for IVR call processing and a table related to subscriber information and an IVR service scenario table have been added in a voice call function through PSTN interworking of a basic gateway. The virtual call interface unit 430 is in charge of the IVR function, not actually connected to the outside, so that all calls requested from inside / outside of the gateway are connected to themselves without having to be delivered to the outside IVR server. After performing authentication, the part that will disappear after the user performs the actual IVR service.

4 is a configuration diagram of a gateway having an IVR server function according to the present invention, which is compared with a conventional gateway as shown in FIG. 2, and includes a virtual call interface unit 430, a subscriber information table 440, and an IVR service scenario table. (490) is added.

FIG. 5 is an overall functional configuration diagram of a system to which the present invention is applied, wherein the gateway 500 includes a trunk call processing block 510, an IVR processing block 520, and a call control block. 530, the Internet Call Processing Block 540, the Call Routing Table 550, the IVR Scenario Table 560, the User Infomation Database 570; It consists of a Configuration Database (580).

Referring to FIG. 5, the trunk call processing unit 510 is for interworking with a private exchange / national exchange (PBX / KTS) 502, and the IVR call processing unit 520 is for IVR service. The call control unit 530 is responsible for control and resource management of all calls, and the internet call processing unit 540 is for VoIP calls. Call routing table 550 is a table for call routing, IVR scenario table 560 is a table for IVR scenario, user information database 570 stores user information, and configuration database 580 stores configuration information. Save it.

First, in case of an outgoing call, when the gateway 500 receives a Caesar request from the private exchange 502, the trunk call processing unit 510 responds first, and reports the Caesar request to the call controller 530. The call controller 530 performs a scissors response and dials a predetermined virtual telephone number to connect with the virtual call processing unit 520.

The reason for using the virtual call processor 520 is not only the convenience of call state control and management, but also the advantage of not having to depend on the PBX and digital trunk signaling procedures that differ slightly from country to country, and various additional functions in one interface. This is because there is an advantage that can be provided.

The message sent and received for the call connection follows the general digital trunk signaling procedure. An important point is that the call controller 530 performs a procedure for immediately attempting to connect to the virtual called number to open a voice call path. After connecting to the IVR interface unit, the error count for user authentication is set to '0', and if the user authentication function is set, a prompt for entering a user account appears. When the user finishes entering the account, they are prompted for a password. The reason why the account is not validated at the account input stage is to prevent fraudulent use due to the leakage of the account.

After entering your account, verify that you are a valid user. If authentication fails, allow the administrator to retry the specified number of times. If the valid user is confirmed as the call control is passed to the IVR call processing unit 520, the user may be provided with various functions.

The IVR call processing unit 520 provides a call forwarding function, a called number confirmation function, a voice guidement function, a VMS function, and a redial function when a connection error occurs.

On the other hand, in case of an incoming call, when a SETUP message is received from the network, the call controller immediately requests a connection to the IVR, and the ringback tone is only heard internally and responded by the IVR interface.

The call controller 530 sends an ALERT message to the other party in the state of hearing the ringback tone, and sends a connection message to the other party in the response state so as to immediately connect.

Incoming call uses H.323 single protocol, so there is no problem in protocol control.

After connecting, IVR service is provided after the user authentication process as in the case of origination. If the PBX does not provide the auto answer function, it can be used by reducing the IVR function supported by the gateway to the auto answer function.

6 illustrates a user authentication procedure and an IVR connection process according to an embodiment of the present invention.

Referring to FIG. 6, when a call arrives at operation 611, the call controller 530 attempts to connect a call to the IVR call processor 520 at operation 612. In step 613, it is determined whether an authentication function for the call connection is set. If it is determined that the authentication function for the call connection is set, in step 614, it is determined whether there is an authentication password. If it is determined that the password exists, in step 615, a welcome and account message is sent to the connected call, in step 616, a caller account is input, and in step 617, a password message is output; In step 618, when the caller password is input, in step 619, it is determined whether the account is usable.

If the connection authentication function is not set, or if the password for authentication is not set or if it is determined that the account is available, the welcome message is played in step 620, and the main menu message is sent in step 621. Play it. In step 622, the destination call routing is performed. In step 623, call routing is performed to the help center, and in step 624, the call is connected.

On the other hand, if it is determined that the user account is not possible, in step 625, it is determined whether the authentication retry limit has been reached. If it is determined that the authentication retry limit has not been reached, in step 626, the number of authentication retries is increased, and in step 627, the authentication operation from step 616 after outputting the authentication retry message. Rerun

In contrast, if it is determined that the authentication retry limit has been reached, step 628 outputs an authentication failure message, and in step 629, the call connection is terminated.

7 illustrates a process of sending and receiving an actual message to access an IVR call interface according to an embodiment of the present invention.

5 and 7, when the caller hooks off the telephone 501 in step 711, the private exchange 502 sends a message of Seizure to the trunk call processor 510 in step 712. to provide.

Then, in step 713, the trunk call processor 510 provides the Seizure.ind signal to the call controller 530. In step 714, the call controller 530 sends a Seizure Ack.req message in response. Provided to the trunk call processing unit 510.

Then, in step 75, the trunk call processor 510 provides the Seizure Ack message to the private exchange 502.

In step 716, the trunk call processing unit 510 starts the virtual dialing, and provides the dialed digits to the call control unit 530 in steps 717 to 719, and the virtual in step 720. End dialing.

Then, in step 721, the call controller 530 provides a Setup.req message to the IVR call processor 520. In step 722, the IVR call processor 520 sends an Alert.ind message to the call controller ( 530).

Then, in step 723, the call controller 530 provides an Alert.Req message to the trunk call processor 510. In step 724, the trunk call processor 510 sends an Alert message to the private exchange 502. To provide.

If the IVR call processor 520 provides the Connect.Ind message to the call controller 530 in step 725, the call controller 530 sends the Answer Req message to the trunk call processor 510 in step 726. to provide.

In operation 727, a voice stream is formed between the private exchange 502 and the IVR call processor 520.

In operation 728, a guide broadcast for user authentication is performed, and in operation 729, a user authentication procedure is performed. In operation 730, the private exchange 502 transmits a DTMF, and in operation 731, the private exchange 520 outputs a main IVR message.

If the caller number collection function is selected in step 732, the call routing table is searched in step 733, and the caller number collection is completed in step 734.

If the IVR call processor 520 provides the Setup.req message to the Internet call processor 540 in step 735, the Internet call processor 540 transmits a SETUP message in step 736.

When the ALERING message is delivered in step 737, the Internet call processing unit 540 provides an Alert.ind message to the IVR call processing unit 520 in step 738, and the IVR call processing unit (step 739). 520 provides the call control unit 530 with the Ringback Tone.ind message, and in step 740, the call control unit 530 transmits the ringback tone to the private exchange 502 through the trunk call processing unit 510.

When the CONNECT message is transmitted in operation 741, the internet call processing unit 540 provides the Connect.ind message to the IVR call processing unit 520 in operation 742. In operation 743, the IVR call processing unit ( 520 provides a voice mode.req message to the call controller 530. Then, in step 744, a call state is established between the caller and the called party.

As described above, the present invention performs basic user authentication and incoming / outgoing call processing by using an internal IVR service at a gateway, and supports various additional services by extending the internal IVR server without being connected to an external IVR server.

Therefore, when the present invention is installed inside a SOHO company using a gateway equipped with an IVR function, there is no authentication for the gateway user.

In addition, the present invention can reduce the burden of having to purchase a product separately for the IVR service, it is possible to provide a variety of additional services only by the gateway can significantly reduce the communication-related costs in the enterprise.

Claims (4)

In the VIP gateway having the mutual voice response function, A trunk call processing unit for interworking with the exchange; An interactive response service call processing unit for processing an interactive voice response service; An internet call processing unit for processing an internet call; A VIP gateway having a mutual voice response function, characterized by comprising at least a call controller in charge of control and resource management of all calls. The method of claim 1, The VIP gateway having a mutual voice response function, further comprising a table storing a scenario for the mutual voice response service. In the VIP gateway having a mutual voice response function, When receiving a Caesar request from the exchange, performing a Caesar recognition response, dialing a predetermined virtual telephone number, and connecting to a mutual voice response call interface; Performing user authentication when connected to the mutual voice response call interface; And if the user is authenticated as a valid user, at least performing a process of providing the mutual voice response service function. In the VIP gateway having a mutual voice response function, Receiving a setup message from a network, connecting to a mutual voice response call interface; When connected to the mutual voice response call interface, transmitting ringback tones only internally, sending a standby message to the other party, and sending a connection message to the other party in a response state; When an incoming call is connected, performing user authentication on the incoming call; And if the user is authenticated as a valid user, at least performing a process of providing the mutual voice response service donation.