JPH10200629A - Call connection system for different area subscriber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate connections inside a present station of a subscriber provided with a different area code and the same station code by comparing and collating the station code received by call origination from a different area subscriber with the station code, provided with a master station exchange and adding the area code to a calling dial, only in the case when they match. SOLUTION: This subscriber 22 of an area 12 calls a subscriber 20 of a master station exchange 30 provided with the station code 3 of the area 11. A subscriber data management process 32 refers to station data 33 and recognizes that it is a 'connection inside the present station' based on a dial number '11+3+XX20', received from the subscriber 22 and the subscriber data of the subscriber 22. By this judgement, the subscriber data management process 32 judges the 'presence of judgement flag' of a judgement flag storage area. When a judgement flag is erected, the object station data of an object station code storage area are retrieved further, and the presence of the same object station code as the received station code 3 is judged. In the example, by the same '11+3+XX20' as the received dial number, a called subscriber is collated and connected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a call connection system for a different area subscriber in a central office exchange accommodating a remote station, and more particularly to a simple connection processing for a subscriber in another area accommodated in the same central office exchange. The call connection method of another area subscriber, which is made possible by adding various functions.

[0002]

2. Description of the Related Art In recent years, simplification of an exchange station has been progressing for the purpose of increasing the capacity of an exchange and improving the efficiency of operation and maintenance by improving the processing capacity of a processor. Specifically, there is a trend to adopt a so-called cluster network composed of a large-capacity exchange and a large number of remote stations connected to the exchange.

[0003] Through this configuration, over the border of the area,
By connecting a subscriber in another area to the master exchange via a remote station, it becomes possible to construct a network economically and efficiently.

[0004] However, a conventional call connection method for a subscriber accommodated in a remote station under the control of the same parent exchange is disclosed in, for example, JP-A-3-113990 or JP-A-5-139990.
As described in Japanese Patent No. 14944, the master exchange analyzes call information including the accommodation position of the subscriber added by the remote station and the dial number received from the originating subscriber. The connection is controlled based on the information on whether or not the subscriber is accommodated in the same remote station and the result of examining the station data.

[0005]

As described above, in the conventional call connection system, in the current numbering plan, another area subscriber such as a remote station subscriber having an area code different from the area code of the master station is used. Is not allowed for subscribers having different area codes and the same station code.

[0006] The reason is that the central office exchange manages the accommodating positions of all the subscribers accommodated in the remote station under control, and the remote subscriber is also regarded as a subscriber of the own station. do it,
Since all call connections of controlled subscribers are processed as intra-station connections, in the case of intra-station connections, connection processing is possible by managing only subscriber data by station code and subscriber number. The code is not used. Also, area codes are added for outgoing calls from the master station to other stations other than the remote station for charging,
Since only area codes are extracted corresponding to the normalized station codes, a plurality of area codes cannot be registered in one station code. For this reason, it becomes impossible to discriminate between subscribers having different area codes and the same station code, and there is a problem in operation and maintenance such as charging and subscriber data management. Therefore, accommodation of such subscribers is not permitted.

SUMMARY OF THE INVENTION An object of the present invention is to provide a simple addition of a function in which a subscriber in another area accommodated in the same master station exchange has a different area code and a subscriber having the same station code. It is another object of the present invention to provide a call connection method for another area subscriber, which is made possible by the above method.

[0008]

In the call connection system for another area subscriber according to the present invention, in the call connection system for another area subscriber in a master station exchange accommodating remote stations in a plurality of areas, the master station exchange comprises: A target station code storage area is provided for storing the same station code as the station code accommodated in the own central office exchange in the station code of the remote station in an area of a different area code. When a call is received, the target office code storage area is searched by the received office code and the destination dial number of the subscriber telephone number,
When a target station code that matches the received station code is indexed, a predetermined area code is added to the received destination dial number to process the intra-station connection.

[0009] With this configuration, the master exchange can connect to subscribers in their own office having different office codes even in different area subscribers by processing only in their own office.

In the call connection system for another area subscriber according to the present invention, in the call connection system for another area subscriber in a central office exchange accommodating remote stations in a plurality of areas, the master office exchange has different area codes. When an outgoing call is made with a station code and a subscriber number from a subscriber of a remote station in the area, the station code of the calling subscriber is compared and collated with the station code of the master exchange and matched. Only when this is done, the area code is extracted from the subscriber data of the calling subscriber, while if they do not match, it is extracted from the office code, added and sent to the destination.

According to this configuration, when extracting the area code, the master exchange compares and compares the office code of the calling subscriber with the office code of the master exchange, and only when the codes match, the calling subscriber is switched. Since the subscriber data can be extracted only from the station code, the increase in connection processing can be minimized.

Further, in the call connection system for another area subscriber according to the present invention, a discrimination flag for discriminating that the master exchange is in the different area code and accommodates the remote station having the same station code is stored. When a call for connection within the own station is received from another area subscriber, first, the discrimination flag storage area is searched, and only when the discrimination flag is set, The target station code storage area is being searched.

With this configuration, the search of the target station code storage area can be limited only when the determination flag is set, so that extra processing can be further reduced.

[0014]

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

FIG. 1 is a functional block diagram showing an embodiment of the present invention. In the call connection system of another area subscriber shown in FIG. 1, it is assumed that the area 11 is adjacent to the area 11. FIG. 1 shows only the main components related to the present invention, and omits the conventional functional components.

In the area 11, a master exchange 30 which connects the subscriber 20 and the maintenance terminal 35 and has office codes 3 and 4 is provided.
And a remote station 41 accommodating the subscriber 21 and connected to the master station 30 and having the station code 5.

The area 12 accommodates the subscriber 22 and is connected to the master exchange 30 of the area 11 and is connected to the remote station 42 having the station code 2 and the subscriber 23 and is connected to the master exchange 30 of the area 11. Remote station 4 with station code 3
And an exchange 44 accommodating the subscriber 24 and connected to a master exchange (not shown) in the area 12 and having the office code 4.
It is assumed that each is provided.

The central office switch 30 has a network 31, a subscriber data management process 32, an office data 33, and an office data registration process 34.

As shown in FIG. 1, the network 31 includes a subscriber 20 having a station code 3 or a station code 4,
Containing a remote station 41 with station code 5 and remote stations 42 and 43 with station codes 2 and 3 respectively in area 12,
It is assumed that it is under the control of the subscriber data management process 32.

The subscriber data management process 32 registers in advance the subscriber data of each of the subscribers 20 to 23 accommodated in its own station, a discrimination flag and a target station code, which will be described later, as station data 33, and makes a call. When an event occurs, the subscriber data related to the event process is searched by referring to the station data 33 to control various processes. Details will be described later with reference to the procedure of the flowchart.

The station data 33 includes, as in the prior art, accommodation information such as a subscriber line and an incoming / outgoing line connected to the network 31, and the subscriber 20 and the remote stations 41,. Subscriber 2 accommodated in
In addition to the subscriber data including the area code and the class information of each of 1, 2, and 23, a discrimination flag indicating that stations having different area codes and the same station code are accommodated in the network 31, It is assumed that the target station code 3 is stored.

The area code corresponding to each subscriber included in the subscriber data is used for identifying the subscriber in charging or the like. Further, the target office code 3 registered in the office data 33 in FIG. 1 corresponds to the office code 3 which is common to both the parent exchange 30 and the remote station 43 in different areas.

Further, the office data registration process 34 receives and receives an instruction from the maintenance terminal 35, and registers / deletes the data of the office data 33 and the discrimination flag.

Next, the registration procedure of the station data registration process 34 will be described with reference to FIG. 1 and FIG.

First, when the station data registration process 34 receives a predetermined discrimination data registration request including the target station code from the maintenance terminal 35 (procedure 101), the station data registration process 34 stores the discrimination flag in the discrimination flag storage area of the station data 33 Is determined (procedure 102).

If the procedure 102 is "NO" and the discrimination flag is not set, the station data registration process 34 registers the discrimination flag in the discrimination flag storage area (procedure 103) and sets the station code received from the maintenance terminal 35 as a target. It is registered as a station code (procedure 104), and the procedure ends.

On the other hand, if the procedure 102 is "YES" and the discrimination flag is set, the station data registration process 34
Proceeds to the above procedure 104, receives the target station code from the maintenance terminal 35, and additionally registers it in the target station code storage area.

Although not shown, if the accepted station code has already been registered, the registered station code is notified to the maintenance terminal 35, and a predetermined procedure is executed similarly to other registered processing procedures. The registration deletion procedure is the same as the other registration deletion procedures.

Next, referring to FIG. 1 and FIG. 3, the subscriber data management process 32 when receiving a call for connection within the local station from the subscriber 22 in another area accommodated in the parent exchange 30. The procedure will be described.

First, the subscriber data management process 32
By accepting the call request and the destination dial number, it is known that a call has been accepted from the subscriber 22 of the remote station 42 accommodated in the parent exchange 30 by the subscriber accommodation position or the call request message (step 111). . Next, the subscriber data management process 32 determines “local connection” based on the accepted destination dial number (procedure 11).
2).

The dial number for connection within the own station in the main office exchange 30 is "office code + subscriber number" when the subscribers 20 and 21 of the area code 11 are used, and other than the area code 11. "Area code 11 + station code + subscriber number" in the case of the subscribers 22 and 23 in the area No.

Here, a case will be described in which the calling subscriber 22 in the area 12 calls the subscriber 20 of the master exchange 30 having the station code 3 of the area 11 with the dial number "11 + 3 + XX20".

First, the subscriber data management process 32
With reference to the station data 33, based on the dial number "11 + 3 + XX20" received from the calling subscriber 22 in step 111 and the subscriber data of the calling subscriber 22, it is known that the connection is within the own station (step 112). YES). By determining the connection within the own station, the subscriber data management process 32 determines “determination flag is present” in the determination flag storage area (step 113).

In the case of FIG. 1, this procedure 113 is "YES".
, The subscriber data management process 32 further searches the target station data in the target station code storage area, and determines whether the same target station code as the station code 3 received in step 111 exists. (Step 114).

In the example of FIG. 1, since there is the target station code 3 and this procedure 114 is "YES", the subscriber data management process 32 distinguishes the subscriber housed in the remote station 43 of the station code 3 from the subscriber code. The called subscriber is collated with the number obtained by adding the area code to the station code and the subscriber number, in this example, the same number "11 + 3 + XX20" as the accepted dial number (procedure 115), and the procedure for connection within the local station is completed. .

Next, a case where the calling subscriber 22 in the area 12 calls the subscriber 20 having the station code 4 in the area 11 by the dial number "11 + 4 + XX20" will be described.

In this example, the station code 3 of the dial number is changed to the station code 4 with respect to the above example. Therefore, the target station data in the target station code storage area is searched from step 111 and the station code 4 received in step 111 is searched.
The procedure is the same as that in the case of the above-mentioned station code 3 up to the procedure 114 for determining the existence of the same target station code.

In this example, since the target station code does not include the station code 4 and the procedure 114 is "NO", the subscriber data management process 32 uses the station code with the area code deleted and the number "4 + XX20" based only on the subscriber number. The called subscriber is collated (step 116), and the procedure for connection within the own station is terminated.

In this procedure, the calling subscriber 22 sets the subscriber 21 of the remote station 41 having the station code 5 to the dial number "11 + 5".
The same applies to the case of calling by + XX20 ".

Also, the calling subscriber 22 has his own remote station 42
Is called by the dial number “2 + XXXX”, the subscriber data management process 32 executes the procedure 1
Based on the dial number “2 + XX20” accepted in step 11 and the subscriber data of the calling subscriber 22, the procedure 112 proceeds to “Y
ES "to know that the connection is" internal station ".

The procedure 113 is "YES" and the judgment flag is set, but the procedure 114 is "NO" and there is no target station code.
Then, the called subscriber is collated with the station code from which the area code has been deleted in step 16 and the number "2 + XXXX" using only the subscriber number, and the connection procedure within the local station is completed.

Next, a case where the calling subscriber 22 in the area 12 calls the subscriber 23 having the station code 3 in the same area 12 by the dial number "3 + XX23" will be described. The subscriber data management process 32 stores the dialed number “3 + XX23” accepted in step 111 and the calling subscriber 22
, The procedure 112 is "YES" and it is determined that the connection is "local connection".

Also, since the determination flag is set when the procedure 113 is "YES" and the target station code 3 is set when the procedure 114 is "YES", the subscriber data management process 32
In step 115, the called subscriber is collated by the number "12 + 3 + XX23" in which the area code is added to the station code and the subscriber number, and the intra-station connection procedure ends.

Next, if the above procedure 113 is "NO" and the judgment flag is not set, that is, if the subscribers having different area codes are accommodated but the subscribers have different station codes, The data management process 32 immediately verifies the called subscriber by using only the "station code and subscriber number" whose area code has been deleted by the above procedure 116, for example, "Y + XXXX", and terminates the connection procedure within the own station. I do.

Next, a case where the subscriber 20 of the office code 3 calls another subscriber of the office code 3 with the dial number "3 + XXXX" in the own area 11 accommodated in the parent exchange 30 will be described.

First, the subscriber data management process 32
Based on the dial number “3 + XXXX” accepted in step 111 and the subscriber data of the calling subscriber 20, step 112
Is "YES" and is "local connection".

Also, since the determination flag is set in step 113 with "YES" and the target station code 3 is in step 114 with "YES", the subscriber data management process 32
In step 115, the called party is verified by the number "11 + 3 + XXXX" in which the area code is added to the station code and the subscriber number, and the connection procedure within the local station is completed.

Next, when the calling subscriber 20 having the office code 3 calls the subscriber having the office code 4 with the dial number “4 + XXXX” in the own area 11, the subscriber data management process 32 proceeds to step 111. Accepted dial number "4+
Based on "XX20" and the subscriber data of the calling subscriber 20, it is determined that the procedure 112 is "YES" and "local connection".

Further, the procedure 113 is "YES" and the judgment flag is set, but the procedure 114 is "NO" and there is no target station code.
Then, the called subscriber is compared with the station code from which the area code has been deleted in step 16 and the number "4 + XXXX" using only the subscriber number, and the connection procedure within the own station is completed.

This procedure is performed for subscriber 2 with station code 5
The same applies to the case of a call to # 1.

Next, the calling subscriber 20 having the station code 3 in the own area 11 becomes the subscriber 2 having the station code 2 in the area 12.
2 is called with the dial number “12 + 2 + XX22”, the subscriber data management process 32 executes the procedure 112 based on the dial number “12 + 2 + XX22” accepted in the step 111 and the subscriber data of the calling subscriber 20 in the “YE”.
S "to know that it is" internal station connection ".

The procedure 113 is "YES" and the judgment flag is set, but the procedure 114 is "NO" and there is no target station code.
Then, the called subscriber is collated with the station code from which the area code has been deleted in step 16 and the number "2 + XX22" using only the subscriber number, and the intra-station connection procedure ends.

Next, when the calling subscriber 20 in the area 11 calls the subscriber 23 having the station code 3 in the other area 12 by the dial number "12 + 3 + XX23", the subscriber data management process 32 accepts in step 111. Based on the dialed number "3 + XX23" and the subscriber data of the calling subscriber 22, it is determined that the procedure 112 is "YES" and "internal station connection".

Also, since the determination flag is set when the procedure 113 is "YES" and the target station code 3 is set when the procedure 114 is "YES", the subscriber data management process 32 is executed.
In step 115, the called party is verified by the number "12 + 3 + XX23" in which the area code is added to the station code and the subscriber number, and the intra-station connection procedure ends.

Next, a case where the above procedure 112 is "NO" and the call of the subscriber of the master exchange 30 is an outgoing connection will be described with reference to FIGS.

If the procedure 112 determines that the call is outgoing connection at "NO", the subscriber data management process 32 checks the received dial number for the presence or absence of an area code (procedure 121).

If the procedure 121 is "YES" and there is an area code, the subscriber data management process 32 proceeds to the predetermined connection procedure (step S1) transmitted to the other station selected on the network 31 with the area code attached. The procedure ends by the procedure 122).

When the above procedure 121 is "NO", the area codes are not added to the subscribers 20 and 21 in the area 11 except for the connection within the own station when the subscribers 20 and 21 call.
Dialed numbers other than, or parent exchange 3 in area 12
The subscriber data management process 32 sends a dial number other than the station codes 2 and 3 to which no area code is added when the subscribers 22 and 23 accommodated in the telephone number 0 make a call.
Is the case where it is accepted from the calling subscriber.

First, when the calling subscriber 20 of the office code 3 dials out from the master exchange 30 in the area 11 using an office code other than the office codes 3, 4 and 5 and a subscriber number, the above-mentioned procedure 112 returns "NO". "
Since the procedure 121 is "NO" and the accepted dial number has no area code, the subscriber data management process 3
2 extracts the office code 3 from the calling subscriber data (procedure 131), and also judges "there is a discrimination flag" (procedure 132).

In this example, when the procedure 132 is “YES”,
Since the determination flag in the determination flag storage area is set, the subscriber data management process 32 further searches for the target station code in the target station code storage area, and searches for the same target station code as the station code 3 extracted in step 131. Judgment of existence
33).

In FIG. 1, since there is the target station code 3, the procedure 133 is "YES", and the subscriber data management process 32 determines the area code 1 from the subscriber data of the calling subscriber.
1 is extracted (step 134), the area code 11 is added to the received dial number, and the dial number is sent to the destination exchange (step 135).

When the connection destination is another exchange and the own area code 11
In some cases, the exchange accommodating the called subscriber may be a remote station in another area, and unless this data is provided, the area code is added to the number to be transmitted by the procedure 135. become.

Next, if the subscriber 21 accommodated in the remote station 41 of the station code 5 from the master exchange 30 in the area 11 does not have an intra-office connection and calls using a dial number that does not include the area code, Data management process 32
In step 131, the station code is extracted from the calling subscriber data, and in step 132, it is determined that there is a discrimination flag.

In FIG. 1, since the discrimination flag is set, the above procedure 132 is "YES" and the target station code 5 is set.
Since there is no data, the procedure 133 is “NO”. Therefore, the subscriber data management process 32 extracts the area code 11 of the calling subscriber 21 from only the office code 5 (procedure 13).
6), the process proceeds to the above-mentioned step 135 in which the area code 11 is added to the received dial number and transmitted to the destination exchange, and the procedure is ended.

This procedure is based on the station code 4 of the parent exchange 30.
The same applies to the case where the subscriber calls.

Next, a case where the subscriber 23 accommodated in the remote station 43 having the station code 3 of the area 12 calls the subscriber 24 of the exchange 44 having the station code 4 of the own area 12 will be described.

Since this call is made by the dial number "4 + XX24" which is not a connection within the local station and does not include the area code, the subscriber data management process 32 executes the above-mentioned procedure 13
In step 1, the station code 3 is extracted from the calling subscriber data, and in step 132, it is determined that there is a determination flag.

In FIG. 1, since the discrimination flag is set, the above procedure 132 is "YES", and the target station code 3 is set.
Therefore, the procedure 133 is “YES”. Accordingly, the subscriber data management process 32 performs a procedure 134 for extracting the area code 12 of the subscriber 23 from the calling subscriber data, and uses the number "12 + 4 + XX24" obtained by adding the area code 12 to the accepted dial number. The process proceeds to the above-mentioned procedure 135 for sending to the exchange, and the procedure ends.

Next, the case where the subscriber 22 accommodated in the remote station 42 having the station code 2 of the area 12 calls the subscriber 24 of the exchange 44 having the station code 4 of the own area 12 will be described.

Since this call is made by the dial number “4 + XX24” which is not a connection within the own station and does not include the area code, the subscriber data management process 32 executes the above-mentioned procedure 13
In step 1, the station code 2 is extracted from the calling subscriber data, and in step 132, it is determined that a discrimination flag is present.

In FIG. 1, since the discrimination flag is set, the above-mentioned procedure 132 is "YES" and the target station code 2
Since there is no data, the procedure 133 is “NO”. Therefore, the subscriber data management process 32 performs a procedure 136 for extracting the area code 12 of the subscriber 23 from only the office code 2, and uses the number "12 + 4 + XX24" obtained by adding the area code 12 to the received dial number to connect to the exchange. Proceeds to the above-mentioned procedure 135 for sending to the server, and terminates the procedure.

In the above description, the functional blocks and the procedures have been illustrated and described. However, changes in the block configuration, rearrangement of the procedures, parallel operations, and the like by separating and merging the functions are free as long as the above functions are satisfied. The description is not intended to limit the invention.

[0073]

As described above, according to the present invention, the connection processing of a subscriber in another area accommodated in the same master exchange can be performed for a subscriber having a different area code and the same office code. However, the effect that it becomes possible by adding a simple function is obtained.

The reason is that, when the master exchange receives a call for connection within the own office from a subscriber of a remote station located in a different area, the master exchange has the station code received by the call of this subscriber. Compared with the office code, and only when they match, the area code is added to the dialed number of the outgoing call to establish a predetermined intra-office connection. This is because a connection can be made to the subscriber by processing only for connection within the own station. Further, a discrimination flag is provided for discriminating that the master exchange is in a different area code and accommodates a remote station having the same station code, and the target station code is searched only when the discrimination flag is set. Therefore, the search for the target station code can be limited, and the processing can be further reduced.

Further, when the master exchange receives a call for a connection other than the intra-office connection, if a different area code accommodates a remote station having the same office code, the same office code as the target office code is used. This is because the area code is extracted from the calling subscriber data only for the calling subscriber having the station code of, and the area code か ら is extracted from the station code only for the other calling subscribers. .

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart showing one embodiment of a station data registration process in FIG.

FIG. 3 is a flowchart showing one mode of connection within a local station in a subscriber data management process in FIG. 1;

FIG. 4 is a flowchart showing another embodiment of the subscriber data management process in FIG. 1 other than the connection within the own station.

[Explanation of symbols]

 11,12 area 20,21,22,23,24 subscriber 30 parent exchange 31 network 32 subscriber data management process 33 office data 34 office data registration process 35 maintenance terminal 41,42,43 remote office 44 exchange office

Claims (7)

[Claims] In a call connection system for another area subscriber in a master exchange accommodating remote offices in a plurality of areas, a master exchange exchanges a local office subscriber from a remote office subscriber in an area having a different area code. When a call is received, the office code received by the subscriber is compared with the office code of the central office exchange, and only when they match, an area code is added to the dial of the outgoing call and a predetermined number is added. A call connection system for another area subscriber, which handles intra-office connection. 2. A call connection system for another area subscriber in a master exchange accommodating remote offices in a plurality of areas, wherein the master exchange uses the station code of the remote station in an area having a different area code. If the exchange has the same office code as that accommodated in the exchange, it has a target office code storage area for storing this office code. The target station code storage area is searched by the code and the destination dial number of the subscriber telephone number, and when the target station code matching the received station code is searched, a predetermined area code is added to the received destination dial number. A call connection system for another area subscriber, which processes a connection within the own station. 3. A discrimination flag storage area according to claim 2, further comprising a discrimination flag storage area for storing a discrimination flag for discriminating that the master exchange is in the different area code and accommodates the remote station having the same station code. When a call for connection within the own station is received from another area subscriber, first, the discrimination flag storage area is searched, and only when the discrimination flag is set, then, the target station code storage area is searched. A call connection system for another area subscriber, characterized in that: 4. In a call connection system for another area subscriber in a master exchange accommodating remote offices in a plurality of areas, the master exchange exchanges a station code and a subscription from a remote station subscriber in an area with a different area code. When an outgoing connection call is received by the calling party number, the station code of the calling subscriber is compared and checked with the station code of the master exchange, and only when they match, from the subscriber data of the calling subscriber. A call connection system for another area subscriber, wherein an area code is extracted, and if they do not match, the code is extracted from the station code, added and sent to the destination. 5. A call connection system for a different area subscriber in a master exchange accommodating remote offices in a plurality of areas, wherein the master exchange uses the station code of the remote station in an area having a different area code. When the exchange has the same office code as that accommodated in the exchange, it has a target office code storage area for storing the office code, and an outgoing call is received from another area subscriber by the office code and the subscriber number. When
The target station code storage area is searched by the station code of the calling subscriber, and when the target station code that matches the station code of the calling subscriber is searched, the area code of the calling subscriber is replaced by the subscriber. On the other hand, if it cannot be searched, it is extracted from the station code of the calling subscriber, and the outgoing connection is processed by adding the area code of the calling subscriber to the received destination dial number. Call connection method for another area subscriber. 6. The discriminating flag storage area according to claim 5, wherein a discriminating flag storing area for discriminating that the parent exchange is in the different area code and accommodates the remote station having the same station code is provided. When a call for outgoing connection is received from another area subscriber by means of a station code and a subscriber number, first, the discrimination flag storage area is searched, and only when the discrimination flag is set, then the target station code A call connection method for another area subscriber, wherein a storage area is searched. 7. The method according to claim 1, wherein the master exchange is provided with the respective functions in any one of claims 1 and 4, 2, 2 and 5, 3 and 6. Area subscriber call connection method.