KR100675140B1 - Method for call control by individual call unit in mobile communication system - Google Patents

Abstract

The present invention provides a call control method for each call unit in a mobile communication system, comprising: a first step of determining whether call control should be performed; If the call control is to be performed in the first step, the call control method includes a second step of performing call control in individual call units in the route, so that the call control method of all call units in the incoming route is not within the incoming route. You will be able to restrict, allow and divert calls to specific individual call units.

Description

Method for call control by individual call unit in mobile communication system

1 is a block diagram illustrating a call control on a route basis in a conventional mobile communication system.

2 is a flowchart illustrating a call control method in units of routes in a conventional mobile communication system.

FIG. 3 is a detailed flowchart illustrating an example of operation at the time of blocking in FIG. 2;

4 is a block diagram showing an example of operation in the destination exchange in FIG.

FIG. 5 is a detailed flowchart illustrating an example of operation at the time of unblocking in FIG. 2;

6 is a block diagram showing an example of operation in the destination exchange in FIG.

7 is a block diagram for call control of individual call units in a mobile communication system to which the present invention is applied;

8 is a flowchart illustrating a call control method for individual call units in a mobile communication system according to the present invention.

FIG. 9 is a detailed flowchart illustrating an example of an operation during incoming call screening in FIG. 8;

FIG. 10 is a block diagram showing an example of operation in the destination exchange in FIG. 9;

FIG. 11 is a detailed flowchart illustrating an example of an operation when filtering an incoming call in FIG. 8;

12 is a block diagram showing an example of operation in the destination exchange in FIG.

FIG. 13 is a detailed flowchart illustrating an example of an operation during outgoing call screening in FIG. 8;

14 is a block diagram showing an example of operation in the destination exchange in FIG.

Explanation of symbols on the main parts of the drawings

10: calling terminal

20: outgoing exchange

30: incoming exchange

40: called terminal

50: switching exchange

The present invention relates to call control in a mobile communication system. In particular, the present invention relates to a call control method for all call units in an incoming route, and to move, to restrict, allow, and divert calls to specific individual call units within an incoming route. The present invention relates to a call control method for individual call units in a communication system.

In general, a mobile communication system is a system that provides a mobile communication service for a mobile object. In such a mobile communication system, there are large numbers of exchanges that perform exchange functions and terminals that can be used by a user.

1 is a block diagram illustrating a call control on a route basis in a conventional mobile communication system.

Here, reference numeral 10 denotes an outgoing terminal that allows the user of the calling party to make a call, 20 is an outgoing exchange that receives and exchanges outgoing calls from the outgoing terminal 10, and 30 represents the outgoing exchange from the outgoing exchange 20. A call exchanger receives a call from the caller terminal 10 and transmits the call to the caller terminal, and 40 is a caller terminal of the called party user who receives a call from the caller switch 30 and performs a call with the caller terminal 10.

2 is a flowchart illustrating a call control method on a route basis in a conventional mobile communication system.

As shown therein, step ST1 of determining whether call control should be performed; Performing call control on a root basis if the call control is to be performed (ST2); Determining whether to block when performing call control on a route basis (ST3); If the blocking is to be performed, controlling the call to the corresponding route by performing blocking on a route basis (ST4); If the blocking is not desired, the operation ST5 is performed to allow the call to the corresponding route by performing unblocking on a root basis.

FIG. 3 is a detailed flowchart illustrating an example of operation at the time of blocking in FIG. 2, and FIG. 4 is a block diagram illustrating an example of an operation in the destination exchange in FIG. 3.

As shown therein, step ST11 of setting up route blocking in the destination exchange 30; After the routing blocking is set in the destination exchange 30, the originating exchange 20 transmits an originating attempt of the originating terminal 10 to the destination exchange 30 (ST12); The incoming exchange 30 fails to occupy the trunk trunk by root blocking, and performs step ST13 of notifying the originating exchange 20 of the call restriction.

FIG. 5 is a detailed flowchart illustrating an example of operation at the time of unblocking in FIG. 2, and FIG. 6 is a block diagram illustrating an example of operation in the destination exchange in FIG. 5.

As shown therein, step ST21 of setting up route unblocking in the destination exchange 30; After the route unblocking is set in the destination exchange 30, the originating exchange 20 transmits an originating attempt of the originating terminal 10 to the destination exchange 30 (ST22); The incoming exchange 30 succeeds in occupying the incoming trunk by route unblocking, and notifies the originating exchange 20 of the call admission (ST23).

The operation of the prior art configured as described above will be described in detail with reference to the accompanying drawings.

First, in the conventional mobile communication system, the call control method of the incoming route unit blocks the route to restrict the call to the corresponding route, and allows the call to the corresponding route by unblocking the route. The ability to control the route in this way to limit and allow all calls in the route is a different concept from the call distribution function for call congestion.

In the prior art, root blocking and root unblocking will be described below.

1.Root Blocking (See Figures 3 and 4)

1) Block the incoming route.

If "BLK-RTE: RTE = 100;" is set, it means that all trunks assigned to route 100 are blocked. Where BLK-RTE stands for Blocking Route.

In FIG. 4, the destination exchange 30 includes a route control (RCO) 31 and a trunk control 32. Thus, the root control unit 31 sets the block report to the trunk control unit 32, and transmits a message saying “RTE = 100” and three relay lines installed (equip trunk = 3). Then, MBLK (Manual Blocking) is set for relay line numbers 1 to 3. That is, trunk no = 1-> MBLK, trunk no = 2-> MBLK, trunk no = 3-> MBLK.

Therefore, when the route control unit 31 transmits the route number and the number of relay lines mounted on the route to the trunk control unit 32, the trunk control unit 32 changes the state of all the relay lines mounted on the route to the MBLK state (ST11). ).

2) The calling subscriber attempts to make a call using the calling terminal 10. The originating exchange 20 then receives it and sends it to the terminating exchange 30 (ST12).

3) The destination exchange 30 allows the call to be restricted when routed to the corresponding incoming route.

At this time, when the incoming call comes in, the trunk trunk status to be occupied is checked first. At this time, only the idle trunk is occupied. In addition, busy (busy), mblk (Manual Blocking), tblk (Test Blocking) ), the call fails if managed in a state such as sblk (Supervisor Blocking) (ST13).

2. Route Unblocking (see FIGS. 5 and 6)

1) Unblock the incoming route.

Thus, when the route control unit 31 transmits the route number and the number of trunks mounted on the route to the trunk control unit 32, the trunk control unit 32 changes the state of all trunks mounted on the route to the idle state. (ST21).

2) The calling subscriber attempts to make a call using the calling terminal 10. The outgoing exchange 20 then receives it and sends it to the destination exchange 30 (ST22).

3) The destination exchange 30 allows the call to be allowed when routed to the corresponding incoming route.

So, when an incoming call comes in, first, the incoming trunk status check to be occupied is occupied. At this time, only the idle trunk is occupied. ST23).

However, this conventional technology has the following problems.

That is, if one incoming route is blocked due to a failure, all trunks assigned to the route are also blocked and cannot be used. This is inefficient in trunk resource operation because it restricts calls to the corresponding route but also blocks normal trunks.

In addition, because the route must be blocked when trying to limit some calls, the use of the route is inefficient.

Therefore, the present invention has been proposed to solve the above-mentioned general problems, and an object of the present invention is not to call control of all call units in the incoming route, but to call a specific individual call unit in the incoming route. The present invention provides a call control method for individual call units in a mobile communication system that can restrict, allow, and switch.

In order to achieve the above object, a call control method of an individual call unit in a mobile communication system according to an embodiment of the present invention,

A first step of determining whether call control should be performed; When the call control is to be performed in the first step, the technical configuration is characterized by including a second step of performing call control in units of individual calls in a route.

Hereinafter, an embodiment according to the technical idea of the call control method for each call unit in the present invention and mobile communication system will be described with reference to the accompanying drawings.

7 is a block diagram for call control of individual call units in a mobile communication system to which the present invention is applied.

Here, reference numeral 10 denotes an outgoing terminal that allows the user of the calling party to make a call, 20 is an outgoing exchange that receives and exchanges outgoing calls from the outgoing terminal 10, and 30 represents the outgoing exchange from the outgoing exchange 20. Receiving exchange to receive the call from the calling terminal 10 to the called terminal, 40 is a called terminal of the called user to receive a call from the called exchange 30 to the call terminal 10, 50 Is a switching exchange 50 that is connected to the incoming exchange 30 so that a call forwarding function such as an automatic response system (ARS) is performed.

8 is a flowchart illustrating a call control method for individual call units in a mobile communication system according to the present invention.

As shown therein, a first step ST31 for determining whether call control should be performed; If the call control is to be performed in the first step, a second step (ST32) and a step (ST33) of performing call control in units of individual calls in the route are performed.

The second step may be performed in units of individual calls including one or more of incoming call screening (ICS), incoming call filtering (ICF), and originating call screening (OCS). Characterized in that.

In the second step, the incoming call screening is characterized in that the incoming call prefix and the incoming route of the call to be restricted are registered, and the transfer number is also registered to release the call.

In the second step, the incoming call filtering registers the incoming call prefix and the incoming route of the call to be allowed, when there are fewer calls to allow than the call to be restricted in the route according to the operating station, and the remaining calls in the route except the corresponding call are registered. As for the conversion number is also registered to release the call.

In the second step, the outgoing call screening is characterized in that the originating prefix and the incoming route to be restricted for the outgoing call are registered, and the transfer number is also registered to release the call.

FIG. 9 is a detailed flowchart illustrating an example of an operation during incoming call screening in FIG. 8, and FIG. 10 is a block diagram illustrating an example of an operation in the destination exchange illustrated in FIG. 9.

As shown in the drawing, the second step is an eleventh step (ST41) of setting up the incoming call screening at the incoming exchange 30 to register the incoming call prefix to be restricted and the called party to be switched. Wow; A twelfth step (ST42) of transmitting the originating attempt of the originating terminal (10) from the originating exchange (20) to the destination exchange (30) after the eleventh step; A thirteenth step (ST43) of occupying an idle trunk in the destination exchange 30 and transmitting a call transfer message to the switching exchange 50 when the route is routed to the corresponding incoming route after the twelfth step; A fourteenth step (ST44) of registering the conversion number in the switching switch unit 50 after the thirteenth step so that incoming calls are made to the switching number; And a fifteenth step (ST45) of informing the incoming call from the destination exchange 40 to the originating exchange 20 after the thirteenth step so that the call is limited to the actual called number attempted by the originating terminal 10. Do it.

In the thirteenth step, after occupying the idle trunk, the database 34 is checked during the translation of the called party number, and if it is confirmed that the restriction prefix registered in the incoming call screening (ICS) is replaced with the conversion number, the switching exchange ( And performing a number translation request.

FIG. 11 is a detailed flowchart illustrating an example of an operation when filtering an incoming call in FIG. 8, and FIG. 12 is a block diagram illustrating an example of an operation performed in an incoming exchange in FIG. 11.

As shown in the drawing, the second step is a twenty-first step of setting incoming call filtering in the incoming exchange 30 to register the incoming route, the incoming call prefix to be allowed, and the called party to switch to (ST51). )Wow; A twenty-second step (ST52) of transmitting a call attempt of the originating terminal (10) from the originating exchange (20) to the destination exchange (30) after the twenty-first step; A twenty-third step (ST53) of occupying an idle trunk in the destination exchange 30 when the route is routed to the corresponding incoming route after the twenty-second step, and transmitting an incoming call permission message to the originating exchange 20; A twenty-fourth step (ST54) of transmitting the outgoing attempt message from the originating exchanger 20 to the destination exchanger 30 when the calling terminal 10 attempts to make a call to another called number after the twenty-third step; A twenty-fifth step (ST55) for occupying an idle trunk in the incoming exchange (30) and transmitting a call transfer message to the divert exchange (50) when routed to the corresponding incoming route after the twenty-fourth step; A twenty-sixth step (ST56) of registering the number with the switching number so that the incoming call is made to the number; And a twenty-seventh step (ST57) in which the called exchange is notified by the called exchanger 40 to the calling exchanger 20 after the twenty-sixth step, so that the call is limited to the actual called number attempted by the calling terminal 10. Do it.

In the twenty-third step, after occupying the idle trunk, the database 34 is checked when the called number is translated, and if the allowed prefix registered in the incoming call filtering (ICF) is confirmed, the incoming call is made to the called number. It is characterized by performing, including.

In step 25, occupy the idle trunk, and then check the database 34 when the called party is translated, and if it is confirmed that it is not an allowed prefix registered in the incoming call filtering (ICF), change to the conversion number and convert the Characterized by performing a number translation request to the exchange 50.

FIG. 13 is a detailed flowchart illustrating an example of an operation during outgoing call screening in FIG. 8, and FIG. 14 is a block diagram illustrating an example of an operation in an incoming exchange in FIG. 13.

As shown in the drawing, in the second step, the call exchange screen 30 sets up an outgoing call screening (OCS) to register the incoming call route to be restricted with the incoming call prefix and the called party to be switched. (ST61); A thirty-second step (ST62) of transmitting an originating attempt of the originating terminal (10) from the originating exchange (20) to the destination exchange (30) after the thirty-first step; A thirty-third step (ST63) of occupying an idle trunk in the destination exchange 30 and transmitting a call transfer message to the switching exchange 50 when the route is routed to the corresponding incoming route after the thirty-second step; A thirty-fourth step (ST64) of registering the conversion number in the switching exchange unit (50) after the thirty-third step so that incoming calls are made to the conversion number; And a thirty-fifth step (ST65) of informing the incoming call from the destination exchange 40 to the originating exchange 20 after the thirty-third step to limit the call to the actual destination number attempted to originate from the originating terminal 10. Do it.

In step 33, after occupying the idle trunk, the database 34 is checked during the translation of the called party number, and if it is confirmed that the restriction prefix is registered in the outgoing call screening (OCS), the switching number is changed to the conversion number. It is characterized by performing including the number translation request.

The operation of the call control method for each call unit in the mobile communication system according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

First, the present invention intends to limit, allow and divert a call to a specific individual call unit in the incoming route, not to call control of all call units in the incoming route.

Here, the route refers to the logical path through which the exchange period call is made, and the trunk refers to the physical path connected to the exchange period.

In addition, the concept of prefix in the present invention is not the same as the concept of "station number" in the general call.

For example, in the incoming call screening of Figs. 9 and 10, when the subscriber number is "011-366-2546", "011" is NPA (Number of Planner Area) and "366" is station number. It is called.

And when performing REG-ICS (Register-Incoming Call Screening), PFX (Prefix) is entered as "366" only, which means "011" subscriber, and it attaches NPA of "011" as default in the system. Displaying the execution result (DIS-ICS, Display-Incoming Call Screening) displays "PFX" = "011366".

Therefore, if the called terminal 40 of the called subscriber is "010-3664-2546" instead of "011", since the "010" NPA is not managed in the system, the PFX should be input as "0103664" when performing REG-ICS. .

Therefore, the prefix concept in the present invention is not "station number" but "NPA + station number".

Meanwhile, the present invention controls the call in individual call units without changing the incoming route state.

Therefore, in the incoming call screening (ICS), the incoming call prefix and incoming route of the call to be restricted are registered, and instead of immediately releasing the corresponding call, the call forwarding service or announcement is also registered so that the call announcement can be connected. Release the call safely.

In addition, the incoming call filtering (ICF) registers the incoming call prefix and incoming route of the call to be permitted when there are fewer calls to be allowed in the route, depending on the operating station. Rather than releasing it, the voice announcement service or announcement can be connected so that the registration number is also registered so that the call can be released safely.

In addition, in case of limiting outgoing call, outgoing call screening (OCS) registers outgoing prefix and incoming route, and registers conversion number so that voice guidance service or announcement can be connected instead of immediately canceling outgoing call. Release the call safely.

Referring to the operation of the present invention in more detail as follows.

1. Incoming call screening (see FIGS. 9 and 10)

Therefore, when the incoming call screening (ICS) is set as "REG-ICS: RTE = 100, PFX = 366, FW_NO = 1508;", all incoming calls having a prefix of 366 are connected to the 1508 ARS. This will be described in detail as follows.

1) Register the incoming route, incoming call prefix to be restricted and called party to be diverted.

In FIG. 10, reference numeral 33 is a route data handling unit located in the destination exchange 30 to perform route data handling, and 34 is a database located in the destination exchange 30.

RTE stands for Route, PFX stands for Prefix, and FW_NO stands for Forward Number.

Thus, the root data handling unit 33 transmits a DB Update (ICS) command to the database 34, and the root data handling unit 33 updates ICS related information in the database.

It can also be set as RTE = 100, PFX = 366, FW_NO = 1508.

Then, all trunk resources can be used for other purposes because they do not change the root state or trunk state (ST41).

2) The calling subscriber attempts to make a call using the calling terminal 10. The originating exchange 20 then receives it and sends it to the destination exchange 30. At this time, an example of the calling number is "011-415-5236" (ST42).

3) When routed to the corresponding incoming route, occupies the idle trunk, and the route data handling unit 33 of the destination exchange 30 checks the database 34 at the time of translation of the called party.

If it is confirmed that the restriction prefix is registered in the ICS, the number is switched to the switching exchange 50 is requested to translate the number.

Therefore, since only one idle trunk in the root is used, the remaining trunk resource management is efficient (ST43).

4) The incoming call is made to the transfer number. At this time, an example of the change number may be set to "1508". This ARS called number can be set to another number (ST44).

5) The call is limited to the actual called number that the calling subscriber tried to make. At this time, an example of the called number is "011-366-2546" (ST45).

2. Incoming call filtering (see FIGS. 11 and 12)

Thus, if the incoming signal filtering (ICF) is set as "REG-ICF: RTE = 100, PFX = 366, FW_NO = 1508;", all calls other than the incoming call having the prefix of 366 are connected to the 1508 ARS. This will be described in detail as follows.

1) Register the incoming call route, the incoming call prefix you want to allow, and the called party you want to switch to.

At this time, the root data handle unit 33 updates the ICF related information in the database.

Since it does not change the root state or the trunk state, all trunk resources can be used for other purposes (ST51).

2) The calling subscriber attempts to make a call using the calling terminal 10. The originating exchange 20 then receives it and sends it to the destination exchange 30. At this time, an example of the calling number is "011-415-5236" (ST52).

3) When routed to the corresponding incoming route, occupies the idle trunk and checks the database 34 when the called party is translated.

If it is confirmed that it is an allowed prefix registered in the ICF, the call is sent to the called number. An example of the called number is "011-366-2546".

Since only one idle trunk in the root is used, it is effective to manage the remaining trunk resources (ST53).

4) The calling subscriber tries to call another called number (ST54).

5) When routed to the corresponding incoming route, occupies the idle trunk and checks the database 34 when the called party is translated.

If it is found that it is not an accepted prefix registered with the ICF, change the conversion number to request a translation of the number.

Therefore, since only one idle trunk in the root is used, it is effective for managing the remaining trunk resources (ST55).

6) The incoming call is made to the transfer number (ST56).

7) The call is limited to the actual called number that the calling subscriber tried to make. At this time, an example of the called number is "011-725-4316" (ST57).

3. Signaling screening (see FIGS. 13 and 14)

Therefore, when the signal signal screening (OCS) is set as "REG-OCS: RTE = 100, PFX = 415, FW_NO = 1508;", all signals having a prefix of 415 are connected to the 1508 ARS. This will be described in detail as follows.

1) Register corresponding incoming route, outgoing call prefix to be restricted and called party to divert.

Thus, the root data handling unit 33 transmits a DB Update (OCS) command to the database 34, and the root data handling unit 33 updates the OCS related information in the database.

It can also be set as RTE = 100, PFX = 415, FW_NO = 1508.

Then, all trunk resources can be used for other purposes because they do not change the root state or trunk state (ST61).

2) The calling subscriber attempts to make a call using the calling terminal 10. The originating exchange 20 then receives it and sends it to the destination exchange 30. At this time, an example of the calling number is "011-415-5236" (ST62).

3) When routed to the corresponding incoming route, occupies the idle trunk, and the route data handling unit 33 of the destination exchange 30 checks the database 34 at the time of translation of the called party.

If it is confirmed that the restriction prefix is registered in the OCS, the number is converted to the change number and the switch exchange 50 is requested to translate the number.

Therefore, since only one idle trunk in the root is used, the remaining trunk resource management is efficient (ST63).

4) The incoming call is made to the transfer number. At this time, an example of the change number may be set to "1508". This ARS called number can be set to another number (ST64).

5) The call is limited to the actual called number that the calling subscriber tried to make. At this time, an example of the called number is "011-366-2546" (ST65).

As such, the present invention is not limited to the call control method of all call units in the incoming route, but restricts, permits, and transfers calls to specific individual call units in the incoming route.

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, in the mobile communication system according to the present invention, the call control method of each call unit is not limited to the call control method of all call units in the incoming route, but restricts and permits calls to specific individual call units in the incoming route. And the effect can be switched.

Therefore, the present invention can be operated in individual call units without making the route or trunk resources in an unusable state in the call control function, which enables efficient resource management.

In addition, the present invention has an advantage of not restricting the route or trunk state because only the call that matches the registered prefix is registered by registering the calling / called party prefix.

In case of the incoming call screening function, 48 routes can be registered per system, and 10 prefixes can be registered per route. In addition, the incoming call filtering function and the outgoing call screening function can be registered in 48 routes per system, and 20 prefixes can be registered in one route. This registerable range is sufficient for call control function operation and is based on an optimized structural design considering system load and memory efficiency.

In the prior art, the call control function of the route unit is released immediately when a call is attempted to the corresponding route, but the call control function of the present invention has an advantage in consideration of the caller by having the caller announce the announcement by placing a change number in an individual call unit. Will be.

Claims (12)

A first step of determining whether call control should be performed; If the call control is to be performed in the first step, the call control may include a second step of performing call control in units of individual calls in a route including at least one of an incoming call screening, an incoming call filtering, and an outgoing call screening. Call control method for each call unit in a mobile communication system. delete The method of claim 1, wherein the incoming call screening is performed in the second step. A call control method for each call unit in a mobile communication system, comprising registering a called party prefix and an incoming route of a call to be restricted and registering a transfer number together. The method of claim 1, wherein the incoming call filtering in the second step comprises: When the number of calls to be permitted is less than the call to be restricted in the route according to the operating station, the call forwarding prefix and incoming route of the call to be permitted are registered, and for the remaining calls except for the call, the call number is also registered. A call control method for each call unit in a mobile communication system, characterized in that for releasing. The method of claim 1, wherein in the second step, call screening is performed. A call control method for individual call units in a mobile communication system, which registers a calling prefix and an incoming route to be restricted for an outgoing call, and registers a transfer number as well. 6. The method of claim 1, wherein the second step comprises: An eleventh step of setting an incoming call screening at the incoming exchange to register the incoming call route and the incoming call prefix to be restricted and the called party to be switched; A twelfth step of transmitting, by the originating exchange, an originating attempt of the originating terminal to the destination exchange after the eleventh step; A thirteenth step occupying an idle trunk in the destination exchange when the route is routed to the corresponding incoming route after the twelfth step, and transmitting a call transfer message to a switching exchange; A fourteenth step of registering the conversion number in the conversion exchange after the thirteenth step so that incoming calls are made to the conversion number; And a fifteenth step of informing the incoming call from the called exchange to the calling exchange after the thirteenth step, so that the call is limited to the actual called number attempted by the calling terminal. Call control method by call unit. The method of claim 6, wherein the thirteenth step is Occupying the idle trunk and then checking the database when translating the called party, and if it is confirmed that the restriction prefix registered in the incoming call screening is performed, converting to the conversion number and performing a number translation request to the switching exchange. Call control method for each call unit in a mobile communication system. 6. The method of claim 1, wherein the second step comprises: A twenty-first step of setting incoming call filtering in the incoming exchange to register the incoming call route, the incoming call prefix to be allowed, and the called party to be switched; A twenty-second step of transmitting, by the originating exchange, the originating terminal's attempt to the destination exchange after the twenty-first step; A twenty-third step of occupying an idle trunk in the destination exchange when the route is routed to the corresponding incoming route after the twenty-second step, and transmitting an incoming call permission message to the originating exchange; A twenty-fourth step, if the calling terminal attempts to call another called number after the twenty-third step, sending a call attempt message from the calling exchange to the called exchange; A twenty-fifth step occupying an idle trunk in the destination exchange when the route is routed to the corresponding incoming route after the twenty-fourth step, and transmitting a call transfer message to the switching exchange; A twenty sixth step of registering a conversion number at the conversion exchange so that incoming calls are made to the conversion number; And a twenty-seventh step of informing the incoming call restriction to the calling exchange in the called exchange after the twenty-sixth step so that the call is restricted to the actual called number attempted by the calling terminal. Call control method by call unit. The method of claim 8, wherein the twenty-third step, In the mobile communication system, the mobile communication system occupies the idle trunk and checks the database at the time of translating the called party, and if it is confirmed that the allowed prefix is registered in the incoming call filtering, the incoming call is made by the called party number. Call control method by call unit. The method of claim 8, wherein the 25th step is It occupies the idle trunk and checks the database at the time of translation of the called party, and if it is confirmed that it is not an allowed prefix registered in the incoming call filtering, it converts to the conversion number and performs the number translation request with the conversion exchange. A call control method for an individual call unit in a mobile communication system. 6. The method of claim 1, wherein the second step comprises: Setting a calling signal screening at the called exchange to register the incoming call route, the calling signal prefix to be restricted, and the called number to be switched; A thirty-second step of transmitting, by the originating exchange, an originating attempt of the originating terminal to the destination exchange after the thirty-first step; A thirty-third step of occupying an idle trunk at the destination exchange and sending a call transfer message to a switching exchange when routed to the corresponding incoming route after the thirty-second step; A thirty-fourth step of registering the conversion number at the switching exchange after the thirty-third step so that incoming calls are made to the conversion number; And a thirty-fifth step of informing the incoming call from the called exchange to the calling exchange after the thirty-third step so that the call is restricted to the actual called number attempted by the calling terminal. Call control method by call unit. The method of claim 11, wherein the 33rd step is Occupying the idle trunk and then checking the database during translation of the called party, and if it is confirmed that the restriction prefix registered in the outgoing call screening is performed, converting to the conversion number and performing a number translation request to the switching exchange. Call control method of individual call unit in mobile communication system.

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