KR100445557B1 - relay billing apparatus, system and method for direct outward dialing - Google Patents

Abstract

For calls connected between the local exchange and the single station exchange, or between the local exchange and the local / local relay exchange, from the inside of the enterprise to the outside via the DOD line, connect to the single or local / external relay exchange, and call details A DOD relay billing device is installed that creates and manages records, analyzes them, generates billing data, and transmits it to the billing center of the telecommunications operator. In addition, the device receives the extension number for the internal telephone of the enterprise and performs the role of transmitting the calling party number to the public telephone network by querying the calling party database registered in advance. In the case of the current inverter exchanger, it is not easy to upgrade a function due to aging, while the DOD relay charging device of the present invention can add and upgrade various services as well as a relay charging service by using a programmable switch.

Description

Relay billing apparatus, system and method for direct outward dialing}

The present invention relates to a relay billing device, a system and a method for a DOD, and more particularly, a device capable of performing relay billing for direct outward dialing (DOD) by connecting between an internal branch exchange and an external public telephone network. The present invention relates to a relay charging system for a DOD including an apparatus and a relay charging method for a DOD using the apparatus.

With the recent development of the communication environment, the proportion of communication using telephones is increasing, and the number of lines used in enterprises is increasing.

Figure 1 shows a network diagram showing a connection method between a corporate internal telephone and a public telephone network according to the prior art. As shown in FIG. 1, a private branch exchange (PBX) 110, 120, 130 is generally used to connect internally used telephones 111, 112, 121, 122, 131, and 132 within an enterprise. The branch offices 110, 120, and 130 serve to connect internal corporate telephones with a public switched telephone network (PSTN) 150 outside the enterprise. The local exchange is connected to the public telephone network through a local exchange (LE) 140 in the public telephone network 150, and is connected to the other party's telephone through a local / local relay exchange (Toll / Tandem Exchange) as needed.

On the other hand, with the increase of telephone demand in the enterprise, new services are provided such as direct inward dialing (DID) and direct outward dialing (DOD) services. DID stands for Receive-Only Line, which can be used inside a company by installing several lines in a single phone number, and allows callers outside the company to make direct calls to recipients inside the company without going through an operator. This is implemented by receiving information (such as an extension number) that the PBX needs from the central office to select the called party. In the case of using such a service, for example, if 10 lines are connected to one phone number by DID, all 10 lines must be in use, and the call is not connected. The call waiting time is short, which is very advantageous in terms of quality of service. DOD, as opposed to DID, refers to a certain number of outgoing dedicated lines.

By the way, DID service is currently provided using both analog and digital lines, but only analog line is used for DOD service, and no trunk line digital line is used for outgoing calls.

There is an increasing demand for digital line for DOD, which connects the telephone from inside the company to the digital line from outside the company, but the biggest reason why this service is not provided is that there is no billing service. In order to provide billing service for DOD service, it is inevitable to revise the Dankook Exchange. However, existing Dankook Exchanges are various in type and are in the late stage, so it is not easy to add or modify the program to provide the billing service. In this state, charging service for digital DOD service is not provided.

Therefore, if the billing information for the DOD service can be generated without modification to the existing single station exchange, it will be a great help for the practical use of the digital DOD service.

On the other hand, according to the recent revision of the relevant laws, such as the communication secret protection law, the caller information display service is provided. However, a call from the inside of the company connected to the public telephone network to the outside through the local exchange may not display caller information or incorrect caller information.

Therefore, it would be very useful if accurate caller information could be displayed for each internal telephone user even in the case of a call directed to the outside through the corporate internal exchange.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and provides a communication system capable of providing a DOD service that can be connected through a digital line from an internal telephone to an external telephone.

It is another object of the present invention to provide a relay billing apparatus for a DOD service for connecting through a digital line from a telephone inside an enterprise to an external telephone.

It is another object of the present invention to provide a relay charging device for DOD which is easy to install and low cost using a programmable exchanger.

Another object of the present invention is to provide a communication system that enables the caller indication service by providing an accurate caller ID even in the case of a call connected from the inside of the company to the outside through the premises exchange.

Another object of the present invention is to enable the caller indication service by converting the internal telephone number received from the premises exchange unit into an external calling number stored in the DB in the relay charging device.

Another object of the present invention is to enable the addition and upgrade of various services in the future as well as the relay billing service by using a programmable switch.

1 is a network diagram illustrating a connection method between a corporate internal telephone and a public telephone network according to the prior art.

2 is a network configuration diagram illustrating a method of connecting a corporate internal telephone and a public telephone network in the case of using the DOD relay billing system of the present invention.

Figure 3 is a block diagram showing the internal configuration of the DOD relay charging device of the present invention in detail.

Figure 4 is a flow chart illustrating a process of connecting a call from the inside of the enterprise to a general telephone outside the enterprise using the DOD relay billing device of the present invention.

Explanation of symbols on the main parts of the drawings

110, 120, 130, 210, 220, 230: Internal exchange

111, 112, 121, 122, 131, 132, 211, 212, 221, 222, 231, 232: internal phone

140, 240: single station exchange

150, 250: public telephone network

260: relay charging device for DOD

In order to achieve the above object, in the present invention, a DOD relay billing service device is installed between the local exchange and the public telephone network. In the case of an incoming call, the call is connected to the public telephone network through the existing single station exchange and the local exchange. In this case, the connection is made from the local exchange to the single station exchange via the DOD relay billing service device.

That is, the relay billing device according to the present invention is connected to a trunk interface module and a trunk interface module which are connected to a terminal exchange or a relay exchange belonging to a local exchange and a public telephone network, respectively, to transmit a call signal, and to a local exchange and a public telephone network. The signal processing module responsible for the signal processing required to set up a call between the end exchanges or relay exchanges belonging to it, and stores mapping information of the extension number of the internal telephone connected to the local exchange and the corresponding external calling number. Performs call control function (CCF) to receive the call signal requested by the user through the database and the DOD line to the public switched telephone network, and to query the database to call the calling extension number External caller ID when making a call Call processing module for transmitting, call detail record (CDR) for outgoing calls, call information management and billing information generation module for generating billing information based on the generated CDR and transmitting the generated billing information It is made, including.

Here, the trunk interface module may carry E1, T1 or analog signals, the signal processing module may process DTMF, R2, ISDN or NO.7 signals, and the DOD line may be a digital line. In addition, the DOD relay billing device is connected between the local exchange and the public telephone network, the outgoing call transmitted from the local exchange is connected to the public telephone network under the control of the call processing module.

On the other hand, DOD relay billing system according to the present invention includes a premises exchange switch connected between a plurality of corporate internal telephone and a public telephone network, and a DOD relay billing device connected between the premises exchange and the public telephone network, The exchange connects outgoing calls from a number of internal corporate telephones to the DOD relay billing device, and the DOD relay billing device receives a call signal requested by the user through the DOD line from the premises exchange to the public telephone network. It performs a call control function to transmit, generates a CDR for the outgoing call and generates the charging information based on the generated CDR to transmit the generated charging information.

In addition, the relay billing method for DOD according to the present invention is made using a DOD relay billing device connected between the local exchange and the public telephone network through the DOD line, the outgoing state of the extension telephone connected to the branch exchange Monitoring the call, receiving an incoming call from the premises exchange, performing signal processing on the incoming call, connecting the call to the calling number obtained as a result of the signal processing, and starting call information generation together with the call connection. Waiting for the call connection to terminate, ending call information generation as the call connection ends, generating charging information based on the generated call information, and transmitting the generated charging information. Include.

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

FIG. 2 is a network diagram showing the entire telephone system including the DOD relay billing device of the present invention. The relay billing device 260 for the DOD is connected between the branch exchanges 210, 220, 230 and the public telephone network 250. FIG. To create a billing record for the call to be connected to the public telephone network 250 within such a device.

That is, as shown in Figure 2, the telephones 211, 212, 221, 222, 231, 232 in the enterprise are connected to a private branch exchange (PBX) (210, 220, 230), DID The line is directly connected from the premises exchange 210, 220, 230 to the end-station exchanger 240, and the DOD line is from the premises exchange 210, 220, 230 via the DOD relay billing device 260 according to the present invention. It is connected to the terminal exchange 240. DID and DOD lines can use either analog or digital lines.

As described above, since the DOD line is connected to the public telephone network 250 through the relay charging device 260 and connected to the public telephone network 250, the call is connected to the public telephone network 250 through the corresponding device in the relay charging device 260. Billing records can be created, and other services such as caller information display for extension telephones within the enterprise.

Figure 3 shows the internal configuration of the DOD relay billing service device of the present invention in more detail.

As shown in FIG. 3, the DOD relay charging device 260 is connected to the branch exchange 210 through the trunk interface module 310. The trunk interface module 310 may receive an existing analog signal or an E1 or T1 signal from the premises exchange 210, and may transmit the same to the public telephone network 250.

Here, the connection between the DOD relay billing device 260 and the public telephone network 250 is efficient in view of the amount of circuits having a large number of digital lines.

The signal processing module 320 connected with the trunk interface module 310 is in charge of signal processing required when the connection request is established by the user through the premises exchange 210 to the terminal exchange 240. The signal processing module 320 may process DTMF, R2, ISDN, or NO.7 signals. For example, this is an operation of extracting a called number or the like by detecting a DTMF, R2 or ISDN signal from a branch exchange.

Calls requested to be connected through the branch exchange 210 are handled by the call processing module 330. The call processing module 330 is a module responsible for direct call control of an open exchange, and basically performs exchange control such as receiving, originating, and connecting a call, manages line state transitions generated during call processing, and manages events for this. Has the ability to create This is called a call control function (CCF). In addition, it analyzes the behavior of a call so that it can function as a relay billing system and plays a role of relaying between CCF and other call control functions. That is, the DOD relay billing device 260 of the present invention manages call information by the call information management and billing information generation module 340, which will be described later, and generates billing information according to the call processing. Operate with module 330. In the future, when there is a function to control a service externally, it analyzes the behavior of such a call and communicates with the service control module to request and respond to call creation and termination, DB routing, and provision of an interactive voice response (IVR) function. You will exchange. Then, by querying the database information held in advance, the extension telephone number received from the local exchange is converted into an external calling party number and transmitted to the public telephone network.

The call information management and billing information generation module 340 generates and manages call information for outgoing calls that are delivered from the premises exchange 210 and connected to the public telephone network 250 via the DOD relay billing device 260. Generate billing information based on The generated call information includes call identifier, CDR (call detail record) generation start time, CDR generation end time, call type (general call / test call), billing type (billing / non-billing), caller ID, called party number, Incoming trunk line identifier, outgoing trunk line identifier, call creation result (success / failure), cause of call failure, billing start time, billing end time, etc.

The billing information can be generated using the call information generated as described above. The billing information can be generated in various ways according to the needs of each telecommunication service provider, and the call information itself is provided to the telecommunication service provider, or the call information is constantly processed. One piece of information can be provided to a carrier. For example, a non-voice CAMA (Centralized Automatic Message Accounting) message, a billing protocol used by KT, may be generated and transmitted to a billing processing system.

Meanwhile, the DOD relay charging device of the present invention may use a redundant host to provide a reliable and stable service, and the duplicated host is managed by the duplication management module 350. The redundancy management module 350 manages the process and system resources of the MCU and plays a role related to redundancy. That is, it examines system resources such as a network to determine an active or standby state and determines each process. Create or terminate depending on the state of the system.

The DOD relay charging device 260 of the present invention may be managed through the operation terminal 270 outside the device. The DOD relay charging device 260 has an operation interface module 370 for communication between the operation terminal 270 and the DOD relay charging device 260. The operation interface module 370 serves as a gateway for communication with the outside, and serves as a path between the MCU and the operation terminal 270, and is responsible for setting, status reporting, and controlling the MCU.

The configuration management module 380 is a module for processing an MML (also called MMC) command input by an operator in the operation terminal 270. In addition, the configuration management module 380 periodically reports the system load, disk status, programmable switch CPU load, channel status, etc. of the DOD relay charging device 260 to the operation terminal 270, and if necessary, each of the programmable switches Perform an automatic recovery of the card.

The alarm management module 360 monitors the state of the redundant host. The status of the host is displayed in a local alarm unit (LAU) (not shown), and is also reported to the operating terminal 270 and also displayed in a remote alarm unit (RAU) (not shown).

Meanwhile, the DOD relay billing device 260 of the present invention includes a database 280 that includes telephone number mapping information for enabling caller information display of an internal corporate telephone. That is, such a database 280 stores caller ID information corresponding to each premises telephone regarding which premises telephone each outgoing call connected to the outside through the premises exchange 210 is originated from. The database 280 is connected to the call processing module 330, and each extension telephone stored in the database 280 is thus stored when the DOD relay billing device 260 of the present invention connects the outgoing call to an external public telephone network. Sender information is sent with the sender information. This makes it possible to display the calling party's desired calling number to the other party even when the call is from a telephone inside the company, which is very convenient.

On the other hand, the DOD relay charging device of the present invention can be implemented using a programmable switch. Therefore, the service can be easily changed or upgraded, and other services can be added.

Now, the process of connecting a call from an internal telephone to an external receiver using the DOD relay charging device will be described. 4 shows a flowchart of the telephone connection method of the present invention.

As shown in FIG. 4, first, the DOD relay charging device 260 is initialized (S410). The initialization of the device 260 is to set up the environment for the telephone connection before the first telephone connection after the DOD relay charging device 260 is installed in connection with the branch exchange 210, 220, 230. After installation, it only needs to be done once. According to the device initialization, the DOD relay billing device 260 is directed from the internal telephones 211, 212, 221, 222, 231, 232 connected to the branch exchanges 210, 220, 230 to the external public telephone network 250. The call can be connected via the DOD relay charging device 260.

Now, the DOD relay billing device 260 monitors the outgoing state of the corporate internal telephones 211, 212, 221, 222, 231, and 232 through the premises exchangers 210, 220, and 230 (S420).

When the corporate internal telephones 211, 212, 221, 222, 231, and 232 are in the outgoing state, the DOD relay billing device 260 is transferred from the branch exchange 210, 220, 230 to the DOD relay billing device 260. Signal processing is performed with the branch exchange 210, 220, 230 with respect to the incoming incoming signal (S430). At this time, the signal to be processed may be a DTMF, R2, ISDN or NO.7 signal.

Next, the database is searched using the signal processing information performed in step S430 to find out the necessary calling information and the called number (S440).

Now, through the control of the call processing module 330 to connect the call in a conventional manner (S450). In this case, sender information (external caller ID) found through DB inquiry is also transmitted to enable the caller indication service to the incoming call. Since the call connection method through the exchange is generally known, description thereof will be omitted.

As soon as a call is connected under the control of the call processing module, generation of call information is started (S460). The call information is generated by the call information management and billing information generation module 340.

After the call is connected, the call waits until the call is terminated (S470). After the connection is terminated, call information generation is terminated (S480). The call information management and billing information generation module 340 generates the relay billing information by using the generated call information, and converts the generated relay billing information into an appropriate format (CAMA or non-voice CAMA, etc.) according to the request of the service provider. Transfer to the charging center (S490). Of course, if necessary, the generated call information may be transmitted to the charging center without being processed.

The present invention has been described in detail with reference to preferred embodiments, but the scope of the present invention is not limited thereto, and should be interpreted by the following claims. In addition, it will be understood by those skilled in the art that various modifications or changes may be made without departing from the spirit of the present invention.

As described above, according to the present invention, when the user wants to make a call to a landline telephone belonging to a public telephone network from a telephone inside an enterprise, the charging information is generated by the DOD relay charging apparatus by connecting the telephone to the public telephone network through the DOD relay charging apparatus. As a result, companies can use digital lines for DOD, and service providers can perform billing services for them. Existing single station exchanger has various types and it is not easy to add and modify the program for providing billing service because it is outdated. You can easily use the digital line for DOD without any modification or replacement. In addition, a caller display service can be provided even in the case of a telephone inside an enterprise by having a database storing a corporate internal telephone and corresponding external calling party number information in a DOD relay billing device. Such a relay charging service can be implemented using a programmable switch, so that the service can be easily upgraded or added.

Claims (10)

In the relay charging device for outgoing dedicated line (DOD; direct outward dialing) for performing the relay transmission of outgoing calls using the outgoing dedicated line and the charging processing thereof, A trunk interface module connected between the branch exchange and the relay switch in the public telephone network to transmit a call signal of a digital line; A signal processing module connected to the trunk interface module and responsible for signal processing such as extracting a called number required for establishing a call between the local exchange and the public telephone network; A database that stores mapping information of an extension number of an internal telephone connected to the branch exchange and an external calling number corresponding thereto; A call control function (CCF) to receive a call signal requested by a user from the local branch exchange and transmit the call signal to the public telephone network through the DOD line, manage a line state transition occurring in a call processing process, and generate an event for it. a call processing module for performing a call control function, and querying the database to map an outgoing extension number to an outgoing outbound number registered in the database to transmit the outgoing outbound number during a call connection; Call information management and billing information generation module for generating call detailed record (CDR) for outgoing calls, generating billing information based on the generated call detail information, and transmitting the generated billing information Relay charging device for DOD comprising a. The method of claim 1, The trunk interface module is a DOD relay charging device capable of transmitting E1, T1 or analog signals. The method of claim 1, The signal processing module is a DOD relay charging device capable of processing DTMF, R2, ISDN or NO.7 signals. The method of claim 1, And the DOD line is a digital line. The method of claim 1, The DOD relay charging device is connected between the local exchange and the public telephone network, The outgoing call transmitted from the premises exchange is connected to the public telephone network under the control of the call processing module relay device for DOD. delete delete In the relay charging method for direct outward dialing (DOD) for relay transmission of outgoing calls using outgoing leased lines and charging thereof, Receiving a call signal transmitted through a digital line from the branch exchange when the user makes a call using an extension telephone connected to the branch exchange; Performing signal processing such as extracting a called number required by the received call to set up a call between the branch exchange and the relay exchange belonging to the public telephone network; The call signal requested by the user to connect the call to the called number obtained by performing the signal processing through the DOD line is transmitted to the public telephone network, and the line state transition occurring in the call processing is managed. Performing a call control function (CCF) to generate an event for the call; Generating a call detailed record (CDR) for the call in response to the call being connected; Generating charging information based on the generated call detail information; Relay charging method for a DOD comprising the step of transmitting the generated charging information. The method of claim 8, The DOD relay billing device has a database that stores mapping information of the extension number of the internal telephone connected to the premises exchange and the corresponding external calling number. Before the call connection step, For the call signal requested by the user, querying the database and mapping outgoing extension numbers to external calling numbers registered in the database; In the call connection step, Relay charging method for DOD to transmit the external caller number when a call is connected. The method of claim 8, The signal processing is a relay charging method for DOD according to DTMF, R2, ISDN or NO.7 signal processing.