JPH08256205A - Connection destination alternate system for high-level telephone service and method therefor - Google Patents

Abstract

PURPOSE: To perform alternate connection or the alternate connection for the second time even when a call termination side in a call termination side exchange encounters a busy state. CONSTITUTION: In a communication network provided with plural exchanges and a network service control station for controlling the respective exchanges, the network service control station is operation so as to mutually connect subscribers by a connection destination alternate method provided with a step S10 for judging the propriety of an alternate cause for connecting a caller to a call termination contractor by the alternate connection, the step S20 for judging alternate possibility relating to the state of the terminal of the call termination contractor, an alternate constraint judging step S30 for permitting the alternate connection with a prescribed alternate limit value set as an alternate connection trial constraint beforehand as an upper limit, the steps S40 and S50 for setting re-control object possibility or impossibility that is whether or not to define the object of alternate connection control for the second time after giving the instruction of the alternate connection for the second time based on the judged result of the alternate constraint judging step and the step S60 for stopping connection.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an advanced telephone service using a telecommunications line, and more particularly to enhancing the function of a telephone service using an intelligent network.

[0002]

2. Description of the Related Art In recent telephone services, various advanced services tend to be provided to its users.
For example, a "toll-free service" provided by Nippon Telegraph and Telephone Corporation is widely known as an information providing service using an intelligent network.

The outline of the advanced telephone service which is the object of the present invention will be described below by taking this "toll-free service" as an example.

This "toll-free service" is an incoming call charge type service for an unspecified number of people using a telecommunication line, and its outline is shown in FIGS.

First, one example of FIG. 4 is an outline of the system of the service as described above, but as shown in the figure, the caller and the called contractor are connected to the public telecommunication network. That is, the sender and the information provider who is the incoming contractor are connected to the subscriber exchanges that accommodate them, and the subscriber exchanges are connected via the relay exchange of this public telecommunication network. Further, each subscriber exchange is connected to a network service control station via a common line signaling network, and a predetermined service function is realized under the control of this network service control station.

The basic function of this network service control station is conventionally known as a network control node (hereinafter referred to as SCP or NSP) in an intelligent network. (For example, there is "Chapter 3 Basic Information Network Technology 3.3 Intelligent Network" published in October 1992, "Information Network Handbook" edited by the Institute of Electronics, Information and Communication Engineers.) The above-mentioned network service control station is a telecommunications carrier. The number information of the called subscriber who has signed the called party billing contract with is stored / stored as a database.

Next, FIG. 5 shows an example of data in the above-mentioned database. That is, for the contracted incoming contractor, the contractor number (logical number) dialed by the caller and the subscriber ID (that is, the called party ID (physical number)) of the incoming contractor are stored in association with each other. . In the example shown in the figure, three types of callee IDs (03-3 ×××-○○○ 1 to 03-3 ×××-○○○ 3) for one logical number "123456"
Is set, even if the same logical number is simultaneously dialed (by a plurality of callers), the called subscriber can connect to each of them. Further, here, the number of incoming subscribers may of course be plural, and they are collectively installed in the whole country or a specific area. Also,
Such a logical number is a number set uniformly throughout the country or region.

Next, the operation of such a conventional service will be described according to a signal sequence. FIG. 6 is a diagram for explaining the operation of the above system.

(1) First, the caller goes off-hook.

(2) The subscriber exchange that accommodates the caller is
When it detects this caller's off-hook, it sends a dial tone to the caller.

(3) The caller dials the desired logical number.

[0012] This logical number is a "communication identification (example: 0120)" indicating the service identification and a "contractor number" designating the destination.
(Example: 123456) ”.

(4) The subscriber exchange that accommodates the caller is
When the dial signal of this logical number (example: 0120-123456) is received, the communication type is identified with the called party billing type service by "communication identification (example: 0120)". Then, the logical number (eg, 0120-123456) is transmitted to the network service control station (NSP) via the common signaling network.

(5) At the network service control station (NSP), an identification number (eg 0120) is sent from the subscriber exchange via the common line signaling network.
-123456), the communication identification (eg, 0120) is first used to judge that the service is of the called party charging type, and the table (see FIG. 5) is searched. Search for contractor number (eg:
123456) reads out the subscriber ID (telephone number) (example: 03-3 ×××-○○○ 1) of the incoming contractor. This gives the physical number for the connection (routing).

Here, the network service control station (NSP) manages the call status of the incoming contractor, and as shown in FIG. 5, the line of the subscriber ID is used to correspond to the subscriber ID. Whether or not it is recorded.

In the case of this example, "03-3 ×××-○○○ 1
Is in a call. Therefore, at the network service control station, another subscriber ID (
Example: 03-3 ×××-○○○ 2) is read.

Next, the subscriber ID (telephone number) of the called contractor (for example, 03-3xxxx-xx2) is sent to the subscriber exchange that accommodates the caller.

(6) The subscriber exchange that accommodates the sender is
Subscriber ID (telephone number) of the information provider from the network service control station (NSP) via the common line signaling network (Example: 03-3 ×××-○○
When (2) is received, the incoming contractor is accommodated by this number via the transit exchange (note that only one is shown in Fig. 4, but there may be more than one) using the public telecommunications network. Connected to the subscriber exchange.

(7) The subscriber exchange that accommodates the incoming contractor calls the incoming contractor.

(8) When the called contractor responds, the caller can talk (communicate) with the called contractor.

Incidentally, these connections were made by the conventional method as shown in the sequence chart shown in FIG.

As described above by taking the "toll-free service" as an example, in the advanced telephone service,
The feature is that it operates under the control of the network service control station.

[0023]

The conventional system operates according to the above sequence, but has the following problems. That is, when the called terminal is in a state of being unresponsive, the network service control station (NSP) cannot recognize the detailed state, so that the connection control function does not substantially work. In other words, due to the management of the network service control station, it may not be possible to connect even if there is a line with a callable (vacant) subscriber ID. For example, when the called terminal side is in communication by making or receiving a call through a general connection that does not go through the network service control station, or when the called terminal side is on the off-hook (that is, it is off-hook while not in a call). Cases are applicable.

Therefore, a plurality ((
When, for example, three (3) subscriber ID lines are associated with each other and a telephone terminal is connected to each line, one of the telephone terminals is in a call through the network service control station, and one is If the handset is left disconnected and the other is idle, the network service control station can manage 2 of 3 lines (free), but actually The line that is off the handset cannot answer. Therefore, if the network service control station bypasses the line to connect to the line, it becomes unresponsive.

If a user can correctly recognize the state that the terminal is disconnected when the terminal is disconnected from the receiver, it is possible to make a detour connection to another vacant terminal, but in the conventional system, such recognition itself is possible. Because it is impossible,
The detour connection was not possible.

Therefore, an object of the present invention is to provide a connection destination detour system and method for enabling detour connection or re-detour connection even when the called side of the incoming exchange encounters a state in which it cannot respond. It is in.

[0027]

The present invention takes the following means in order to solve the above problems and achieve the object. That is, in a telecommunications network having a plurality of subscriber exchanges and transit exchanges, and a network service control station that controls all of the above-mentioned exchanges, the network service control station is configured to identify the identification logical number dialed by the caller. Means for recognizing a connection state between subscribers by using a database including a conversion table recording connection subscriber numbers of at least two incoming subscribers corresponding to the above, and by referring to the conversion table, Connection control means that operates to connect the caller to the called subscriber by converting an identification logical number to the corresponding connecting subscriber number, and the connecting subscriber to be converted and connected first. When the person number is being communicated, it is converted to another connection subscriber number one by one, and it is judged whether or not the detour connection is possible, and the detour determination means. Based on the determination result of the constant means, and a bypass instruction means for instructing the connection to the connection control means until the caller can bypass connected to the bypass can be the called subscriber.

[0028]

By taking such means, the system of the present invention has the following operation. That is, when the network service control station returns a connection instruction response to the exchange, if it is determined that the call is in a detourable state in the connection control managed by the network service control station, Information indicating that the call is a re-controlled call is stored in the database.

The exchange is requested to re-control the network service control station together with the reason why the connection is impossible only when the destination terminal on which the connection is instructed is currently "connection-disabled" and "call to be re-controlled". The information is notified, and the notified network service control station stores it in the database and manages the state of the terminal.

In the network service control station, when it becomes necessary to connect to the detour destination, referring to the management table in the database, "determination of the reason for the detour" is followed by "determination of the detour allowable range". And "determination of detour control value" are performed, and only when each determination result is satisfied, a new detour destination is found from the table, and the connection between the terminal and the exchange is completed. It should be noted that this operation is repeated as long as the above determination condition is satisfied.

[0031]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 conceptually illustrates a configuration and a detouring operation of a system device for realizing a connection destination detouring method according to a first embodiment of the present invention.

As shown in the figure, a plurality of subscriber exchanges and transit exchanges are connected to the telecommunications network, and a network service control station (SCP) that controls these exchanges is arranged. Further, the network service control station is provided with an identification logical number dialed by the caller as shown in FIG.
It is possible to search the centralized database (DB) for a conversion table that stores the connection subscriber numbers of at least two incoming subscribers (corresponding to the subscriber number in Fig. 5) corresponding to the subscriber number). Have. Then, by referring to this conversion table, it is possible to obtain information by which the current connection state of the incoming contractor can be recognized.

Further, by referring to this conversion table, a certain identification logical number can be converted into its corresponding connecting subscriber number, and the converted connecting subscriber number (that is, the incoming subscriber). Connection control is appropriately performed so that the caller is connected to the line.

In connection control by such a procedure, the connection system of the present invention performs the following connection destination bypass control as a basic operation. That is, when the identification logical number is received, it is converted into the connecting subscriber number corresponding to this logical number. At this time, if there are multiple corresponding subscriber numbers for connection, the centralized database (DB) is searched in sequence to see if there is a terminal that can make a "detour connection" in addition to the subscriber number to be converted. Also determine whether or not.

At this time, if the subscriber number to be first converted is currently "calling (communication)", it can be converted to the next connecting subscriber number and whether or not the "detour connection" is possible. Is determined. Such a "detour destination determination process" is basically repeated until a subscriber number capable of detour connection is found in the table. Note that the steps of the detailed determination procedure regarding the above-described detour destination determination processing are illustrated in FIG.

As described above, by searching the centralized database (DB) for the network service control station (SCP), it is possible to convert the identification logical number into a subscriber number for connection and a "detour connection". Information to be used as a basis for determining whether or not to be introduced.

The connection destination bypass method of the advanced telephone service configured as described above, when converting the connection subscriber number based on the conversion table and connecting the caller to the called subscriber,
If there is a connection subscriber number in the "empty" state in this conversion table, and the connection cannot be made with this converted connection subscriber number, for example, the handset is disconnected and a physical call is not possible. In such a case, another connection subscriber number in the "vacant" state is searched again from the conversion table, and the connection destination is detoured so that the connection can be substantially made.

In this connection destination bypass method, when there is a connecting subscriber number in the "empty" state in the conversion table, empty information to that effect is notified to the subscriber exchange accommodating the sender. I do. Note that the reconnection operation is set to be performed only when the subscriber exchange receives the notification of the availability information.

The above-mentioned reconnection operation is set to be performed as long as there is a "free" connection subscriber number in the conversion table.

Next, FIG. 2 exemplifies a signal sequence chart exchanged between the respective nodes in the line in connection destination bypass control of the present embodiment. The operation of the system of the present invention will be sequentially described with reference to the chart shown. In addition, in this explanation, the "free dial service" will be taken as an example as in the conventional example.

(1) First, the caller goes off-hook. Then dial the desired logical number. This logical number indicates the service identification and is composed of "communication identification (example: 0120)" and "contractor number (example: 123456)" designated as the recipient.

(2) The subscriber exchange that accommodates the caller is
When the dial signal of the logical number (Example: 0120-123456) is received, the communication type is identified with the called party charging type service by "Communication identification (Example: 0120)" and the logical number (Example: 01
20-123456) to the network service control station (SCP) via the common signaling network.

(3) At the network service control station (SCP), a logical number (eg, 0120) is sent from the subscriber exchange via the common signaling network.
-123456), the communication identification (example: 0120) is first used to judge that the service is a called party charging type service, and the conversion table (see FIG. 5) is searched. By searching, the subscriber ID of the incoming subscriber corresponding to the subscriber number (Example: 123456) (
Phone number) (Example: 03-3 ×××-○○○ 1) This gives the physical number for routing. Next, it is determined whether or not the detour is possible.

Here, the network service control station (SCP) manages the call status of the incoming contractor, and as shown in FIG. 5 of the related art, the line of the subscriber ID is used to correspond to the subscriber ID. Whether or not it is recorded. In the case of the example of FIG. 1, the incoming call contractors have terminals DN1 to DN3, which are managed.

In the example of FIG. 1, the called party terminal DN1 is
Connection is in progress via the network service control station and "calling"
Since it is in the state of, it is determined that the connection is impossible.

Therefore, the network service control station (SCP) is
Instead of converting to (connection subscriber ID: 03-3 XXX- ○○○ 1), search the database (DB) to determine whether or not alternative connection is possible. To do. In this case, D
Since N2 (connection subscriber ID: 03-3 XX XX-XX2) is "vacant", conversion to this subscriber ID is performed. Then, the network service control station (SCP) further determines whether or not the detour connection to the DN 3 (connecting subscriber ID: 03-3 XXX- ○○○ 3) is possible. In this example, the DN 3 is “vacant” and a detour connection is possible. Therefore, the network service control station (SCP) sends the conversion to the DN2 and the information indicating the state in which the call can be further bypass-connected (that is, "re-control connection call" display) to the subscriber exchange that accommodates the caller. Reply. That is, the content of the notification signal "Indicate" in this example is the destination ID of the DN2 (03-3 XXX- ○○○ 2) + "call to be re-controlled", and this notification signal informs the subscriber exchange. Will be replied.

(4) The subscriber exchange that accommodates the sender is
Subscriber ID (telephone number, 03-3 ×××-○○○) of the called subscriber from the network service control station (SCP) via the common line signaling network
When 2) is received, the receiving contractor (terminals DN1 to D through the relay switch using the public telecommunications network using this number)
N3) is connected to the subscriber exchange.

(5) This subscriber exchange tries the first detour connection to the terminal DN2. At this time, the information of the "recontrol connection call" is appropriately stored inside the exchange.

However, at this time, the called party terminal DN2 is
As shown in Fig. 1, because the handset is in the "disconnected" state and connection is not possible, the notification information to that effect is added to the REL (RELease) signal, which means disconnection, that is, the "disconnect" information. Add to notify the local exchange that accommodates this caller.

(6) The subscriber exchange that accommodates the sender is
When this notification information is detected, the information indicating that the connected call is the "re-controlled call" is received first.
Send "est" to the network service control station (SCP).

(7) The network service control station (SCP) performs a "detour determination process" based on a predetermined determination standard (that is, a line operation standard, etc.), and connects to a further detour destination. (Note that
Details of this determination algorithm are shown in FIG. ) That is, regarding the connection to the DN2, it is determined that the connection cannot be made due to the "reason for connection failure" that has been returned, and the detour determination process is performed to determine whether or not the detour to the other line (destination ID) of the called contractor is possible. To do. At this time, DN3 (connection subscriber ID: 03-3
×××-○○○ 3) is still "empty", this DN3
Make a detour connection to. In this case, if the call of DN1 has ended, it is further treated as a "re-control target call". Also,
If DN1 is "vacant", it may be detoured to this DN1.

In this example, DN3 is "empty", D3
The description will proceed assuming that N1 is “in a call”.

The network service control station (SCP) again sends a notification signal "Indicate" to the subscriber exchange accommodating the caller, to which the information about the DN3 <Destination ID 03-3 XXX- ○○○ 3> is added. Reply.

(8) This subscriber exchange again uses the IAM (Initial) which means a call to the subscriber exchange accommodating the called party.
When an al Address Message) signal is transmitted, a calling signal is sent from the subscriber exchange accommodating the called party to the terminal DN3.

(9) Since the called party terminal DN3 is actually in a "vacant" state and can be connected as shown in FIG. 1, when this DN3 responds, it means an acknowledgment from the terminating side subscriber exchange. An ANM (ANsewr Message) signal is returned. Here, the line is established for the first time, and thereafter, communication such as voice call becomes possible.

As another processing in the above-mentioned signal sequence, for example, when the response of the incoming contractor is detected by the subscriber's exchange, the communication start time is set to the network service control station (SCP). Is notified via the common line signaling network. Further, after that, the “disconnection process”, the “billing process” and the like are also performed by a predetermined method. At the end of the series of communications, the call originator's subscriber exchange notifies the network service control station (SCP) of the communication end time via the common signaling network.

The call management in the network service control station is
The call with the subscriber ID converted based on the dialed logical number is performed by receiving a response from the incoming contractor by the call start notification from the subscriber exchange on the caller side and the call end notification accompanying the disconnection process. Of course, management such as "billing processing" based on this notification is also performed. Therefore, it is possible for the network service control station (SCP) to manage the call of the called subscriber based on the dialing of the logical number.

The flowchart of FIG. 3 shows the procedure of the connection destination bypass control performed again by the network service control station (SCP) based on the reference of the conversion table in the database (DB).

When the caller dials the identification logical number,
The table in which the connection subscriber numbers of at least two incoming subscribers corresponding to the numbers are recorded is referred to. At this time, since the network service control station (SCP) controls the interconnection between the subscribers based on the search of the table, the program of the step procedure listed below is executed.

When the activation of this routine program for carrying out the detour determination process is started, the step of updating the counter n, which indicates that the routine has been entered once, is incremented by one.
Execute (S5). However, in this example, the counter n is the number of detour attempts n as a comparison condition with a detour limit value described later.
Is.

Next, by converting the identification logical number into the corresponding connecting subscriber number, the caller can be connected to the desired called contractor by the bypass connection (for example,
"Call in progress", "Handset disconnected" or "Line congestion"
Etc.) Step of determining the validity of the detour reason (S10)
Is executed. Here, when the reason for the detour is not appropriate, it is considered that the detour connection is not necessary, and the connection stop processing step (S60) is performed to end the series of the detour determination processing of this time.

On the other hand, as a result of the determination in step S10,
If the reason for the detour is valid, the next detour possibility is checked subsequently. That is, with respect to the state of the connection subscriber number of the called contractor (for example, based on the state of the terminal such as “not in a call and the handset is not detached”), the step (S20) of determining the detour possibility is performed. To be executed. If there is no detour possibility, it is considered that the detour connection cannot be physically or logically performed, and after this determination step, a connection stop processing step (S60) is performed and the series of detour determination processing of this time is ended.

If there is a possibility of a detour in step S20, the next detour restriction condition is checked subsequently. That is, for example, a detour restriction condition determination step for permitting a detour connection with a predetermined detour restriction value N set in advance with the number of detour connection attempts being n
(S30) is executed. Here, when the detour restriction condition is satisfied (that is, N <n), the network service control station (SCP) is notified of the information that the relevant "call" is "recontrollable" and the connection is established. After executing the instructing step (S40), the series of detour determination processing of this time is similarly ended.

On the other hand, when the detour restriction condition is not satisfied (that is, N = n), the step of notifying the SCP of the information that the "call" cannot be "re-controlled" and instructing the connection ( S50) is executed, and this series of determination processing ends.

It should be noted that this series of routines is entered every time detour determination is required, and the same detour determination processing is repeated. Each time, the value of the counter n is increased to approximate the limit value N of the condition determination step S30.

As described above, according to the connection destination bypass method of the advanced telephone service of the present invention, the incoming terminal which is substantially connectable in accordance with the bypass control method including each of the determination steps (S10, S29, S30) as described above. Control is being performed to make a detour.

(Modified Embodiment) As another check of the detour restriction condition, a preset time, that is, a timeout T may be set as an upper limit, and when there is no response within a predetermined time T, The terminal may be operated by using the judgment criterion that the connection is impossible as a detour destination together with the judgment criterion regarding the number N of times.

Further, the procedures in the signal sequences or the kinds of signals described in the embodiments are within the main operation range of the present invention in order to meet the specifications of each operational exchange forming the network. It may be transformed with.

Therefore, in addition to the embodiments described above, various modifications can be made to the embodiments of the device of the present invention without departing from the spirit of the present invention.

[0071]

According to the connection destination bypass control of the present invention, even if the terminal cannot be connected due to a state such as "handset removal" of the terminal that cannot be recognized by the network service control station, the connection control function for bypass or the like is provided. Since, for example, the network service control station has three handsets, DN1 is busy and DN2, D
When N3 is "empty", even if DN2 cannot be connected because it is out of the handset, a bypass connection to another DN3 is possible.

That is, the network service control station in this system
(SCP) recognizes the status of the managed telephone terminal in real time and enables reconnection.Therefore, an outgoing call that cannot be connected due to a call from the called party or disconnection of the handset is re-established. It becomes possible to relieve by the connection destination bypass function, and as a result, it is possible to improve the connection completion rate of outgoing calls on the line.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a connection destination bypass method of a system device according to an embodiment of the present invention.

FIG. 2 is a signal sequence chart of communication between nodes regarding connection destination bypass control according to the present embodiment.

FIG. 3 is a flowchart showing a connection destination bypass control procedure performed by the network service control station of the present embodiment.

FIG. 4 is a schematic diagram of a conventional service system.

FIG. 5 is an explanatory diagram showing an example of a management data table in a conventional database.

FIG. 6 is a signal sequence chart related to conventional system operation.

[Explanation of symbols]

SCP ... Network service control station, DB ... Database, DN
1 to DN3 ... Receiving terminal, S10 ... Detour reason determination step, S20 ... Detour possibility determination step, S30 ... Detour restriction condition determination step, S40 ... Re-control target connection instruction step, S50 ... Re-control target connection instruction Step, S60 ... Connection cancellation processing step.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyuki Shinozaki 1-6, Uchiyuki-cho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Ryoji Kono 1-1-6 Uchisai-cho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation

Claims (6)

[Claims] 1. A network service control station is provided in a telecommunications network including a subscriber exchange, and two or more called subscribers are connected for connection in the telecommunications network in correspondence with an identification logical number dialed by a caller. The network service control station holds a conversion table in which the caller number is recorded, and the identification logical number designated by the caller is converted into the connection subscriber number based on the conversion table to transfer the caller to the caller. It operates so as to be able to connect to the called contractor, and if the connection subscriber number to be converted is being communicated on the conversion table, it is sequentially converted to another connection subscriber number and the transmission is made. Is an advanced telephone service connection destination bypass method configured to connect a caller to the incoming call contractor, converting the caller into the connection subscriber number based on the conversion table, and connecting the caller to the incoming call contractor. Contacting the person When there is an empty connection subscriber number in the conversion table, when the connection with the connection subscriber number cannot be established, the connection table is converted into an empty connection subscriber number again. An advanced telephone service destination bypass method, which is configured so that it can be reconnected and reconnected. 2. When the conversion table has an empty connection subscriber number, the vacant information to that effect is notified to the subscriber exchange accommodating the caller, and the subscriber exchange receives the information. Is configured to perform a reconnection operation only when receiving notification of free information of
The connection bypass method of the advanced telephone service according to claim 1. 3. The reconnection operation is configured to be performed as long as there is an empty connection subscriber number in the conversion table.
Alternatively, the connection bypass method of the advanced telephone service according to claim 2. 4. A telecommunications network comprising a plurality of subscriber exchanges and transit exchanges, and a network service control station that controls all of the exchanges in a unified manner, wherein the network service control station is dialed by a caller. A means for recognizing a connection state between subscribers by using a database including a conversion table recording connection subscriber numbers of at least two incoming subscribers corresponding to identification logical numbers; Connection control means that operates to connect the caller to the called subscriber by converting the identification logical number to the corresponding connecting subscriber number by reference, and the connection control means to be converted and connected first When the connection subscriber number is in communication, a detour determination means for sequentially converting the connection subscriber number into another connection subscriber number and determining whether or not a bypass connection is possible, and An advanced telephone comprising: a detour instruction means for instructing a connection to the connection control means until the caller can be detour-connected to the incoming call contractor capable of detouring based on a result of the detour decision means. Service destination bypass method. 5. In a telecommunications network having a plurality of subscriber exchanges and transit exchanges, and a network service control station which controls the exchanges in a centralized manner, at least 2 corresponding to an identification logical number dialed by a caller. A centralized database including a conversion table recording connection subscriber numbers of one or more incoming subscribers is provided, and the network service control station controls interconnection between subscribers based on a search of the centralized database. To do so, determining the adequacy of a detour reason for connecting the caller to the called contractor by a detour connection by converting the identification logical number to a corresponding connection subscriber number, A step of determining a detour possibility regarding the state of the connection subscriber number of the called subscriber, and a predetermined preset as a detour connection trial restriction condition. A detour restriction condition determination step that permits a detour connection with a detour restriction value as an upper limit, and an instruction for a detour connection again based on the determination result of the detour restriction condition determination step is performed, and then a target of the bypass connection control is performed again. A method of circumventing a connection destination of an advanced telephone service, characterized in that it operates according to a procedure consisting of the step of setting whether or not to re-control, which is whether or not, 6. The step of determining the validity of the detour reasoning is appropriate to make a detour connection to another called terminal when the called terminal is in a call, disconnected from the handset, or congested. It is characterized in that it is determined on the basis of the criterion that the possibility of detouring is determined based on the criterion that there is no connection possibility when the state of the other receiving terminal is busy or disconnected from the receiver. Along with the above, the detour limit value of the detour restriction condition determination step is a number of detour connection attempts or a detour connection trial duration, or a combination of the number of detour connection attempts and the detour connection trial duration. The method for bypassing the connection destination of the advanced telephone service according to claim 5.