KR100814515B1 - Mobile communication system and method for preventing free telephone call using calling forwarding of received call - Google Patents

Abstract

A mobile communication system and a method for preventing a free call through call forwarding are provided to determine malicious call forwarding, transmit a guide message for informing the malicious call forwarding to transmitting/receiving terminal subscribers, and terminate the call. A PBX(Private Branch eXchange)(102) receives a call originated to mobile communication terminal subscribers(106), to whom a free call is set, from a managed wired telephone terminal(100) and transmits the received call to a mobile communication network. A CGS(Cellular Gateway Switch)(204) performs call processing by being connected with the PBX and plural wired/wireless exchanges, and identifies the call originated to the mobile communication terminal to which the free call is set. If call forwarding is set to the mobile communication terminal as an object of the originated call, the CGS connects the originated call to a VMS(Voice Mail Service)(208). If receiving call forwarding of the call originated to a free call pay system subscriber from the CGS, the VMS transmits a call-forwarded number to a transmitting party's terminal by using an ARS(Automatic Response Service) guide message. After that, the VMS terminates the requested call. An HLR(Home Location Register)(206) checks whether the call, originated to the free call pay system subscriber and detected from the CGS, is forwarded. After that, the HLR provides call forwarding information.

Description

Mobile communication system and method for preventing free calls through call forwarding {MOBILE COMMUNICATION SYSTEM AND METHOD FOR PREVENTING FREE TELEPHONE CALL USING CALLING FORWARDING OF RECEIVED CALL}

1 is a configuration diagram of a specific plan application system of a conventional mobile communication network;

2 is a configuration diagram of a specific plan application system of a mobile communication network to prevent free call forwarding according to an embodiment of the present invention;

3 is a flowchart illustrating an operation control for free call forwarding in a specific plan application system of a mobile communication network according to an embodiment of the present invention;

4 is a block diagram of a specific plan application system configuration of a mobile communication network to prevent a free call forwarding according to another embodiment of the present invention,

5 is a flowchart illustrating an operation for preventing call forwarding toll-free operation in a specific plan application system of a mobile communication network according to another exemplary embodiment of the present invention.

<Brief description of the major symbols in the drawings>

100: landline telephone 102: private exchange

204: gateway exchange 206: HLR

208: VMS 106: Free call plan subscriber terminal

108: call forwarding terminal

The present invention relates to a free call service in a mobile communication network, and more particularly, to a mobile communication system and a method for preventing a subscriber receiving a free call benefit from a specific group from a mobile communication network illegally making a free call using call forwarding. It is about.

Currently, the mobile phone service is not only providing a communication service for voice call, but various additional services are being developed to create new demand. Among these supplementary services, there is a "coloring" service that allows a user to select a ringing tone of a mobile phone according to a user's preference, or a navigation service that informs a driving route of a user's current location or destination through a mobile communication terminal. The above additional services are used for various purposes according to the needs of terminal users.

In addition, as well as the development of additional services as described above, specific plan services such as various discounts or free currency products by age and class, such as seniors, military members, and youths, have also been developed to actively target new consumers according to product characteristics.

On the other hand, among the specific plans in the mobile communication network as described above, there are free calling plan products for specific subscribers or free calling plans for specific groups. In other words, as a free call plan product for a specific group, a free call plan is implemented such that a call fee is not charged when calling a military communication plan subscriber from a landline telephone in the military.

However, some users frequently abuse the free call service through call forwarding for the free call plan service. That is, when using a landline phone, a free call plan subscriber can transfer his / her mobile terminal to another phone number by using a free call. There was a problem in exploiting the free call plan service.

1 is a block diagram of a mobile communication system for exemplifying that a free call is abused through a call forwarding when a conventional landline telephone calls a subscriber of a free communication plan.

That is, as shown in FIG. 1, after the free communication plan subscriber 106 transfers his / her phone to a wired / wireless telephone terminal 108 in a wired or mobile communication network, the subscriber uses the wired telephone 100. When calling a subscriber plan 106, this call is routed through the private switch 102 and the gateway gateway 104 to another wired / wireless terminal 108 within the forwarded wired or mobile communication network. There was a problem that a free call was made even with a wired / wireless telephone terminal 108 that does not apply to a free call plan.

In this case, the mobile communication service provider suffers a considerable loss in sales due to the illegal use of the free call due to the abuse of the free call plan, and in particular, in the case of the above free call plan, even the access fee of the call connected by the user is borne. If the caller is unclear and it is agreed to charge the incoming call of the landline, it is impossible to charge the access fee.

Accordingly, it is an object of the present invention to provide a mobile communication system and method that can prevent a free subscriber from making a free call illegally using a call forwarding in a mobile communication network.

The present invention for achieving the above object is a mobile communication system for preventing a call forwarding free call, receiving a call from the wired telephone terminal management to the mobile communication terminal subscribers to which the free call is set and transmits it to the mobile communication network. The private exchanger is connected to the private exchanger and the plurality of wired / wireless exchanges to perform call processing, and identifies an outgoing call to the mobile communication terminal set to the free call, and the call forwarding is set to the target mobile communication terminal. In case of receiving a call forwarding of the call from the gateway exchange to the subscriber of the toll free calling plan from the gateway exchange, the call forwarding number is transmitted to the calling terminal as an ARS announcement. The VMS disconnecting the requested call and a free call charge detected from the gateway exchange It characterized in that it checks whether the outgoing call to the subscriber call forwarding include a HLR to provide a call forwarding information.

In another aspect, the present invention is a method for preventing a free call using a call forwarding of free subscribers in a mobile communication network including a gateway exchange, HLR, (a) a fare free fare setting originating from a plurality of exchanges in the gateway exchange Detecting an outgoing signal from an exchange, (b) requesting whether the target switching terminal of the outgoing call has been forwarded to the HLR when detecting the outgoing set fee; When the call forwarding to a number other than the subscriber's phone number set free of charge, the step of temporarily forming a call path with the called terminal, and (d) After sending the announcement to inform the caller to disconnect the terminal after a certain time And disconnecting the call.

Hereinafter, with reference to the accompanying drawings will be described in detail the operation of the preferred embodiment according to the present invention.

2 illustrates a configuration of a mobile communication system for preventing a toll subscriber from making a free call illegally using a call forwarding according to an embodiment of the present invention.

Hereinafter, with reference to FIG. 2 will be described in detail the operation in each component of the mobile communication system for preventing free calls using the call forwarding.

First, the private exchange 102 receives a call sent from the landline telephone 100 to the subscriber of the free call plan and transmits it to the gateway switch 204 in the wireless network.

The gateway exchange 204 is connected to the private exchange 102 and a plurality of wired / wireless exchanges to perform call processing, and the call for the free call transmitted from the private exchange 102 of pre-specified free call subscribers. By identifying the process, the call sent from the landline telephone 100 to the toll free designated subscriber 106 is first checked whether or not the corresponding plan subscriber terminal is called. Subsequently, when it is checked that the toll-free subscriber 106 terminal is forwarded, the incoming call from the landline telephone 100 and the called number are transferred to the VMS (Voice Mail Service) 208.

At this time, the gateway switch 204 is a field option that can be selected to detect the incoming call to the incoming RTE information of a specific route, that is, one for the incoming RTE information, for example Add a field to add a field option that can select whether or not incoming call is forwarded at this time.If the value of the above field option is true, it is determined that it does not correspond to call forwarding. After the announcement is sent to the forwarded number by connecting to), the call is controlled to be disconnected.

When the VMS 208 is connected to the gateway switch 204 and receives the incoming call of a specific route from the gateway switch 204, the VMS 208 transfers the forwarded number to the calling party's landline telephone 100 as an ARS announcement. After the transmission, the requested call is disconnected from the landline telephone 100.

In this regard, after the call is transferred without the guidance of the incoming telephone number, only the announcement to send to another phone is sent, and when the call is disconnected, only the announcement within the gateway switch 204 can be replaced without interworking with the VMS 208.

3 illustrates an operation control flow for preventing a toll subscriber from making a free call illegally using a call forwarding in a mobile communication system according to an embodiment of the present invention. Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 2 and 3.

First, when there is a call request from the landline telephone terminal 100 to the toll free subscriber plan (S300), the private switch 102 transmits a call from the landline telephone 100 to the subscriber plan to the gateway switch 204. (S302).

Then, the gateway exchange 204 detects an outgoing call from the private exchange 102 that is sent to the mobile communication terminal of the call-free call plan subscribers sent from the plurality of exchanges (S304), and the call is possible at a free rate. The home location register (hereinafter referred to as "HLR") 206 for the call to the subscriber of the plan indicates whether the call forwarding function is set to another phone number in the destination terminal. Request (S306).

Accordingly, the HLR 206 inquires the telephone number requested from the gateway exchange 204 to check whether the terminal of the telephone number is set for call forwarding to another telephone number, and then checks whether the call is forwarded or not. Gives notification to (S308). Then, if the gateway exchange 204 is checked from the HLR (206) that the call forwarding is not set to the toll-set call destination that is the target of the call request requested from the above HLR (206), the gateway exchange 204 sends a call to the mobile switch that the destination terminal exists. Routing and transmission allows the call path to be formed in the call destination terminal (S310).

However, if it is checked that the call forwarding is set in the free call set-up destination terminal 106, which is the target of the call request requested from the HLR 206, the gateway switch 204 VMS the call forwarding number information. And transmits to 208 (S312). Then, the VMS 208 transmits a message indicating that the call is disconnected due to the forwarded number and the incoming call to the calling party's landline telephone 100 as an ARS announcement (S314), and disconnects the call (S316). .

4 is a block diagram of a mobile communication system that prevents a toll subscriber from making a free call illegally using a call forwarding according to another embodiment of the present invention.

Hereinafter, an operation of each component of a mobile communication system for preventing a free call using call forwarding will be described in detail with reference to FIG. 4.

First, the private exchange 102 receives a call sent from the landline telephone 100 to the subscriber of the free call plan and transmits it to the gateway switch 204 in the wireless network.

The gateway exchange 204 performs call processing in connection with the private exchange 102 and the plurality of wired / wireless exchanges, and sends out an outgoing call for the free call transmitted from the private exchange for the predetermined free call plan subscribers. By identifying, the call originated from the landline telephone 100 to the designated free call subscriber 106 is first checked whether the corresponding plan subscriber terminal is called.

Subsequently, when it is checked that the toll-free subscriber 106 terminal is forwarded, the forwarded wired / wireless telephone through the wired / wireless exchanger (not shown) in which the forwarded wired / wireless telephone terminal exists. After setting a temporary call to the terminal 108, a message indicating that the call is disconnected is sent, and after a predetermined time, the connected call is disconnected.

5 is a flowchart illustrating an operation control flow for preventing a toll subscriber from illegally making a free call using a call forwarding in a mobile communication system according to an embodiment of the present invention. Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 4 and 5.

First, when there is a call request from the landline telephone 100 to the toll-free subscriber (S500), the private switch 102 transmits a call from the landline telephone 100 to the subscriber 408 of the plan. To transmit (S502).

Then, the gateway exchange 204 detects an outgoing call from the private exchange 102 sent to the mobile communication terminal of the call-free toll-free subscriber 106 from the multiple exchanges (S504), and at a toll rate. In response to an outgoing call to the corresponding plan subscriber 106 capable of making a call, the target of the outgoing call is requested to the HLR 206 whether the call forwarding function is set to another phone number (S506).

Accordingly, the HLR 206 inquires the telephone number requested from the gateway exchange 204 to check whether the terminal of the telephone number is set for call forwarding to another telephone number, and then checks whether the call is forwarded or not. (S508). Then, if the gateway switch 204 is checked that the call forwarding is not set in the toll-free subscriber set terminal 106 that is the target of the call request requested from the HLR 206, the corresponding toll free subscriber 106 terminal Routing transmission of the outgoing signal to the existing mobile switch is to be formed to establish a communication path between the calling / terminating terminal (100, 106) (S510).

However, if it is checked that the call forwarding is set to the toll-free subscriber 106 terminal which is the target of the call request requested from the HLR 206, the gateway switch 204 transfers the call to the requested call terminal 108. ) Is transmitted through the wired / wireless exchange (not shown) to the corresponding call forwarding requesting terminal 108 and the telephone call between the calling / calling terminals 100 and 108 is possible (S512).

As above, after forming a call path for a predetermined time between the caller / caller terminal (100, 108), the gateway switch 204 sends a guide message indicating that the call is disconnected due to illegal call forwarding (S514), to disconnect the call. (S516).

Meanwhile, in the above description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. That is, in the present invention, for example, when using a landline telephone to call a toll free subscriber plan such as military communication, the call is prevented from being misused to another number other than the originally designated free toll plan subscriber through call forwarding. As described above, the same can be applied to a call from a plurality of in-corporate private exchanges performing a specific plan to a subscriber of a mobile communication terminal set with a free call. Therefore, the scope of the invention should be determined by the claims rather than by the described embodiments.

As described above, the present invention prevents abuse of free calls through call forwarding when calling a mobile communication terminal subscriber registered in a specific group such as a military unit or a corporation in which a specific plan such as a free call is set in a mobile communication network. In the case that the gateway exchange detects a call from a private exchange of a group having a specific plan set to a free call to a mobile communication terminal and the incoming call of the mobile communication terminal is switched, it judges a malicious call transfer and sends / receives a call. By disconnecting a call after sending a guide message informing the terminal subscriber of this, there is an advantage of preventing a free call using a call forwarding.

Claims (9)

As a mobile communication system that prevents free call forwarding, A private exchange which receives an outgoing call from the wired telephone terminal to the mobile communication terminal subscribers to which free calls are set and transmits it to the mobile communication network; Call processing is performed by being connected to the private exchange and a plurality of wired / wireless exchanges, and identifying an outgoing call to the mobile communication terminal set for the free call, and when the call forwarding is set to the target mobile communication terminal of the outgoing call, the outgoing call is made. A gateway exchange that connects calls to VMS, Receiving the call forwarding of the call sent from the gateway exchange to the subscriber of the toll free rate plan, transmitting the forwarded number to the calling terminal as an ARS announcement, and disconnecting the requested call; HLR that provides call forwarding information by checking whether the outgoing call from the gateway exchange to the subscriber of the toll free rate plan is forwarded. Mobile communication system for preventing a call forwarding free call comprising a. The method of claim 1, The gateway exchange performs call forwarding with respect to the other party's terminal of the outgoing call plan by checking a field option value added to indicate whether the incoming call is forwarded in the incoming call to the toll subscriber. A mobile communication system for preventing a call forwarding free call, characterized in that determining whether or not. The method of claim 1, And the private exchange is a military unit private exchange in which a mobile telephone call charge to a mobile communication terminal registered as a military communication subscriber is set free of charge. The method of claim 1, And the private exchange is a corporate private exchange in which a mobile telephone call charge to a mobile communication terminal registered as a corporate subscriber is set free of charge. As a mobile communication system that prevents free call forwarding, A private exchange which receives an outgoing call from the wired telephone terminal to the mobile communication terminal subscribers to which free calls are set and transmits it to the mobile communication network; When the call is connected to the private exchange and a plurality of wired / wireless exchanges to perform call processing, and identify an outgoing call to the mobile communication terminal set to the free call, the incoming call is set to the target mobile communication terminal. A gateway switch that transmits a message indicating that the call is disconnected and disconnects the call after setting up a temporary call between the switched terminal and the calling terminal; An HLR that provides call forwarding information by checking whether the outgoing call from the gateway exchange to the subscriber of the toll free rate plan is forwarded; A wired / wireless exchange that connects the requested call through the gateway exchange to the forwarded wired / wireless telephone. Mobile communication system to prevent a free call forwarding including a. As a method for preventing a free call using a call forwarding of a toll subscriber in a mobile communication network including a gateway exchange and an HLR, (a) detecting, at the gateway exchange, an outgoing call from a fare free rate setting private exchange originating from a plurality of exchanges; (b) requesting whether the target switching terminal of the calling signal is forwarded to the HLR when the toll-set calling signal is detected; (c) when the toll-free signal is forwarded to a number other than the toll-free subscriber's phone number, temporarily forming a call path with the called terminal; (d) disconnecting the call after sending the announcement to the terminal subscriber that the incoming call is disconnected after a predetermined time; Free call forwarding prevention method in a mobile communication system comprising a. The method of claim 6, In the step (c), the incoming call terminal is a wired or mobile communication terminal, characterized in that the wired or mobile communication terminal connected to a wired or mobile telephone network. The method of claim 6, In the step (a), the private exchange is a mobile telephone call charge to a military unit private exchange or a mobile communication terminal registered as a corporate subscriber, in which a mobile phone call charge to a mobile communication terminal registered as a military communication subscriber is set free of charge. A method for preventing a call forwarding free call in a mobile communication system, characterized in that the corporate private exchange is set free of charge. As a method of preventing a free call using a call forwarding of a toll subscriber in a mobile communication network including a gateway exchange, an HLR, and a VMS, (a ') detecting an outgoing call from a fare free rate setting private exchange originating from a plurality of exchanges at the gateway exchange; (b ') requesting whether the incoming call has been forwarded to the HLR when the outbound call is detected; (c ') connecting the call to the VMS when the toll-free call is forwarded to a number other than the toll-free subscriber's phone number; (d ') disconnecting the call after notifying that the call is forwarded from the VMS to the calling terminal; Free call forwarding prevention method in a mobile communication system comprising a.

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