JPH09331390A - Call control method for intelligent network - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain call connection even when a service control point(SCP) is in congestion or on the occurrence of a link fault or SCP fault. SOLUTION: On the occurrence of an intelligent network(IN) service call translating a dial number into an incoming call terminal number, a caller side service switching point(SSP) sends dial information received from a subscriber terminal equipment to an SCP via an inter connect gate(ICG). The SCP obtains an incoming call terminal equipment number and a path decision access dial number to the called side SSP from the dial information and sends them to the inter connect gate ICG. The inter connect gate ICG uses the incoming call number or the like received from the SCP to connect a caller terminal equipment and the called terminal equipment and stores the called terminal equipment number or the like corresponding to the dial information. On the occurrence of an IN service call, even when the SCPs are in congestion or on the occurrence of a link fault or an SCP fault, the inter connect gate ICG uses the stored information to connect the caller terminal equipment and the called terminal equipment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intelligent network IN (Inte
lligent network) control method, especially the service control node S in an intelligent network.
The present invention relates to a call control method for an intelligent network, which can reduce the load on a CP (Service Control Point) and can perform service control even when the SCP control becomes impossible or difficult.

[0002]

2. Description of the Related Art The architecture of an intelligent network IN (Intelligent Network), which introduces the processing functions of a computer into a telecommunications network and improves the realization of advanced services and the flexibility of the network, has been studied, and specific services are provided. Has been realized.

FIG. 9 is a system configuration diagram of the intelligent network IN. 1 is a service control point (SCP) for executing various supplementary service (IN service) controls, and 2 is a NO. A telephone signaling network such as a 7 signaling network 3 ₁ , 3 ₂ is connected to the telephone signaling network 2 and performs a service control point SSP (Servic) for executing call control processing associated with IN service and other normal call control processing.
e Switching Point), 4 are provided in the telephone signal network,
InterConnect Gate ICGs 5 ₁ and 5 ₂ that perform communication control with the service control point SCP and connection control between each SSP associated with IN service are subscriber terminals connected to each service exchange point SSP. . The service control point SCP has a computer configuration, is configured to exchange data with the interconnect gate ICG, and includes a processing unit device CPU, a storage unit that stores a service program, and a database that stores data necessary to execute an IN service. ing. Each of the service switching points SSP3 ₁ , 3 ₂ is specifically a digital switching center, and includes a call circuit, a central processing unit, a subscriber circuit,
It has a relay trunk circuit. The interconnect gate ICG also has the same hardware configuration as the exchange.

The service exchange points SSP3 ₁ and 3 ₂ form networks of different telephone companies (for example, NTT and DDI), and each SSP 3 ₁ and 3 ₂ has only information about its own subscribers. Therefore, when a call is made from a subordinate subscriber to a subscriber of another company, the SSP asks the service control point SCP, which manages information common to each company, to translate the dial number into the subscriber's number of another company. You need to connect to a subscriber of another company. For example, subscriber 5 ₁
There Dialing numbers ***** indicating a special number and remote subscriber 5 ₂ indicating that the IN service number translation, originating service switching point SSP3 ₁ recognizes that the IN service from the special number, outgoing terminal 5 ₁ of information (phone number), Interconnect gate ICG the dialed digits, etc.
To the service control point SCP via. The service control point SCP analyzes the dialed digits entered according to the service program, and from the database, the telephone number of the called subscriber 5 ₂ corresponding to the number **** and the service exchange point S at which the called subscriber is accommodated.
Determine the route decision for access dial number to SP3 _2,
These analysis results are notified to the interconnect gate ICG. When the interconnect gate ICG receives the analysis result from the service control point SCP, it controls the service exchange points 3 ₁ and 3 ₂ to connect the originating subscriber 5 ₁ and the terminating subscriber 5 ₂ .

[0005]

As described above, every time a call accompanied by an IN service occurs, the service switching point SSP is transmitted through the interconnect gate ICG as described above.
And service control point SCP is required.
Therefore, if a large number of IN service request calls occur at one time due to TV shopping, ticket application by telephone, etc., the load on the service control point SCP increases. In addition, IN services such as toll-free services and credit call services have already been provided, and in the future, it is expected that various services will be provided using intelligent networks, which will increase the load on the service control point SCP. It is expected to increase more and more. When the service control point SCP is overloaded, the IN service request call is restricted, and normal call connection is impossible.
Further, if a link failure between the service switching point SSP and the service control point SCP or a failure of the SCP occurs, the call connection requiring the IN service becomes impossible.

[0006] From the above, it is an object of the present invention to intelligently reduce the load on the service control point SCP.
A call control method for a network is provided. Another object of the present invention is to provide as much I as possible even if the service control point SCP is overloaded, or if a link failure between the interconnect gate ICG and the service control point SCP or a failure of the service control point SCP occurs.
An object of the present invention is to provide a call control method for an intelligent network which enables a call connection requiring N services. An object of the present invention is to reduce the load on the service control point SCP with a small memory usage,
Another object of the present invention is to provide a call control method for an intelligent network that enables connection of IN service request calls when a link failure or a service control point SCP failure occurs.

[0007]

FIG. 1 is a diagram illustrating the principle of the present invention. 11 the service control point SCP, 12 ₁ executes the control of various telephone services (IN services),
12 ₂ ~12n plurality of service switching point for executing a call control process associated with the IN service SSP, 13 service control point SCP and the service switching point SSP
Telephone signal network connected to, 14 _{11 to} 14 ₁ m, 14 ₂₁ to 1
4 ₂ n, 14 n _{1 to} 14 ns are service switching points SSP
The subscriber terminal 15, which is connected to, is an interconnect gate ICG which is provided in the telephone signal network and connects between the service switching points SSP or between the service switching points SSP and the service control points SCP. Fifteen
c is a storage device M provided in the interconnect gate
It is M. The service switching points SSP12 ₁ and 12n form networks of different telephone companies (for example, NTT and DDI).

Subscriber terminal 14₁₁Receive more dialed digits
IN service that requires a service to translate to a terminal number
When a request call occurs, the service switching point SS on the originating side
P12₁Is the sending terminal 14₁₁More dial information received
Service system via interconnect gate ICG15
Send to your point SCP11. Service control point S
CP executes IN service processing based on dial information
Then, the receiving terminal 14n₁Accommodates the telephone number of the
Access dial number for route determination to the receiving SSP
Is sent to the interconnect gate ICG. Inter
-Connectgate ICG is service control point SCP
Use the called number received from the
Service exchange point SSP12₁, 12n controlled to send
Terminal 14 ₁₁And the receiving terminal 14n₁Connect the die and
The storage device 15c stores the receiving terminal number and the like in association with the dial information.
Accumulate in. The above is the control during normal operation.
Control point SCP is in connection restriction state due to congestion
Or the failure of the service control point SCP
Time, or the service control point SCP and the interface
-In the event of a link failure between the ConnectGate ICGs,
The connect gate ICG performs the following control. Sand
The interconnect gate ICG requires IN service.
Call request dial information from service exchange point SSP
If received, refer to the stored information in the storage device and dial
Obtain the called terminal number etc. according to the information, and call the called terminal number etc.
Is used to connect the calling terminal and the called terminal.

As described above, even if the service control point is in the congestion state, or the service control point S
Even if there is a failure in the CP or if there is a link failure between the service control point SCP and the interconnect gate ICG, the called terminal number of the IN service request call is calculated and the calling terminal and the called terminal are connected. Can improve the service. The interconnect gate ICG is not limited to the above cases, but when dial information is input, it always refers to the stored information to check whether there is a called terminal number or the like according to the dial information, and if it exists, Can also be configured to connect the calling terminal and the called terminal using the called terminal number or the like. In this way, the service control point S
The load on the CP can be reduced. ... Claims 1 to
Four

The interconnect gate ICG checks whether or not the same contents are already stored when storing the called terminal number and the like in association with dial information, and if they are stored, counts the number of outgoing calls and stores them. If not, the number of calls is set to 1 and the called terminal number or the like is stored in the storage device 15c in association with the dial information, and the stored information in which the number of calls is equal to or less than the set value is cleared every predetermined period. By doing so, only the frequently used information can be stored, and the used memory amount can be reduced. Also,
The interconnect gate ICG can also clear all the stored information in the storage device 15c every predetermined period, and the above control can be performed with a small amount of used memory. Furthermore, when the stored information exceeds the memory capacity, the interconnect gate ICG can overwrite the latest information in order from the oldest information, and can store only the latest information with a small used memory amount. ... Claims 5 to 7

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION

(A) Overall Configuration FIG. 2 is a configuration diagram of an intelligent network (IN) according to the present invention. 11 the service control point to execute the control of various telephone services (IN _{services) SCP, 12 1, 12 2} ~12n call control processing associated with the IN service, a plurality of service switching points SSP to perform other normal call control process , 13 are NO.s to which the service control point SCP and the service switching point SSP are connected. Telephone signaling network, such as 7 signaling network, 14 ₁₁ ~14 ₁ m, ₁
Reference numerals 4 _{21 to} 14 ₂ n, 14 n _{1 to} 14 ns are subscriber terminals connected to the service switching points SSP, and 15 is provided in the telephone signal network, between the service switching points SSP or between the service switching points SSP and the service control points. S
It is an interconnect gate ICG that connects between CPs.

(B) Service Control Point SCP The service control point SCP11 has a computer configuration and is configured to exchange data with the interconnect gate ICG15. The processing unit device CC15a, the storage unit MM15b for storing a service program, and the IN service are provided. Database DB1 that stores data required for execution
5c. The database DB stores various data provided by the service control point SCP. When the service switching points SSP12 ₁ and 12n form networks of different telephone companies (for example, NTT and DDI), each SSP 12 ₁ and 12n has only information about its own subscriber. Therefore, service exchange point SS
When a call from a subordinate's subscriber to a subscriber of another company occurs, P12 ₁ and 12n use the dial number entered from the subscriber's terminal to the service control point SCP that manages information common to each company. It is necessary to have it converted into a number and connect to the subscriber of the other company under the control of the interconnect gate ICG. Therefore, in the database DB,
Corresponding to the dialed number, the telephone number of the receiving terminal,
The access dial number for route determination to the receiving side SSP accommodating the receiving terminal is stored.

(C) Service exchange points SSP Service exchange points SSP 12 ₁ , 12 ₂ , ... 1
2n is a digital exchange, specifically, a central processing unit C for controlling the communication circuit SW and the exchange as a whole.
C, a main memory MM, a subscriber circuit, a relay trunk circuit, and the like. The main memory MM stores programs for performing various exchange processes. The programs related to the present invention include a digit translation processing program that analyzes a dial number from a subscriber terminal and an IN service control processing program that performs processing according to the dial number when it is an IN service request call.

(D) Interconnect Gate ICG The hardware of the interconnect gate ICG is similar to that of the exchange, such as a call circuit SW15a, a central processing unit CC15b for controlling the whole, a main memory MM15c for storing various programs and data, and a relay. It has a trunk circuit. In addition, interconnect gate ICG
Is functionally a function as a relay station connecting between the service switching points SSP, the service switching points S
Function as a relay station between SP and service control point SCP, function for registering the calling number information and calling frequency information of the IN service request call in the main storage device 15c, function for clearing the calling number information by referring to the calling frequency information , And has a function of connecting the service exchange points SSP by referring to the calling number information stored in the main storage device. The calling number information is dial information of the IN service request call input from the service switching point SSP, the called terminal number input from the service switching point SCP, and access for route determination to the receiving side SSP accommodating the called terminal. This is information corresponding to the dial number. The transmission count information is S of the IN service request call having the same dial information.
It is the number of transmissions for each SP.

When an IN service request call for translating a dialed number into a called terminal number is issued from the subscriber terminal 14 ₁₁ ,
The service switching point SSP12 ₁ on the calling side receives the dial information received from the subscriber terminal from the interconnect gate I.
Send to service control point SCP11 via CG15. The service control point SCP executes the IN service processing based on the dial information, and obtains the telephone number of the receiving terminal 14n _{1 and} the access dial number for determining the route to the receiving side SSP accommodating the receiving terminal to the interconnect gate ICG. send. The interconnect gate ICG uses the incoming call number received from the service control point SCP and uses the incoming call side and the incoming call side service exchange point SSP.
Controlling the terminals 12 ₁ and 12 n, the calling terminal 14 ₁₁ and the receiving terminal 14
Connect between n ₁ . In addition, interconnect gate ICG
Stores the called terminal number and the route determining access dial number received from the service control point SCP in the storage device 15c as the calling number information in association with the calling side service exchange point SSP and the dial information. In this case, the interconnect gate ICG checks whether the called number or the like is already stored in correspondence with the same dial information, and if it is stored, counts only the number of outgoing calls, and if it is not stored, then the outgoing call is sent. The number of times is set to 1, and the incoming call number and the like are stored in the main storage device 15c in association with the dial information.

FIG. 3 is a diagram for explaining an example of storing the calling number information. The trunk number (trunk group index TG) indicating the route of the service switching point SSP12 ₁ on the calling side.
X) and the dialing information of the subscriber, the number of outgoing calls information, the receiving terminal number, and the access dial number for determining the route to the receiving side SSP accommodating the receiving terminal are stored.

(E) Connection control sequence of IN service request call FIG. 4 is a sequence explanatory diagram of the present invention for connecting the calling terminal and the called terminal based on the IN service request call. In the call connection between subscribers in an intelligent network IN, caller ID from the caller terminal 14 _11, when receiving the call setup request message SETUP accompanied by dialed digits (access code + ****), etc., originating service switching point The SSP12 ₁ determines whether the call is an IN service request call. If it is an IN service request call, the SSP 12 ₁ sends an address message IAM containing the telephone number and dialed digits of the calling subscriber 14 ₁₁ to the interconnect gate ICG 15.
Sending (Initial Address Message) and sending terminal 1
4 ₁₁ transfers the CALL PROC (Call Proceeding) message to notify the fact of being processed for call setup.

When the interconnect gate ICG receives the IAM message, the service control point SCP11
Initiation message TC-BEGIN to establish communication with
Send (Transaction Capabilities-BEGIN). In addition,
The TC-BEGIN message contains the calling subscriber number and dialed digits. When the service control point SCP is not in a congested state and service control is possible, the service control point SCP identifies the requested IN service based on dial information included in the TC-BEGIN message, and executes processing according to the IN service. To do. For example, when the IN service is the number translation described above, the service control point SCP is the database D.
From B, the SSP 12n accommodating the telephone number of the receiving terminal 14n ₁ and the receiving subscriber corresponding to the number ***
Request access dial number for route determination. After that, the service control point SCP sends the termination message TC-E.
The information obtained by ND is transmitted to the interconnect gate ICG, and at the same time, an instruction is established to establish a path between the calling terminal 14 ₁₁ and the receiving terminal 14 n ₁ . The above is the case where the service control point SCP is not in the congested state. However, when the service control point SCP is in the congested state and the service control is impossible, the service control point SCP indicates that it is in the congested state by the TC-END message. Notify ICG.

When the interconnect gate ICG receives the TC-END message, it checks whether the service control point SPC is in the congestion state. If it is not in the congestion state, the address message IAM including the called terminal number received from the service control point SCP. Is sent to the service exchange point 12n on the called side, and registration processing of called number information and the like described later is performed. If the service switching point 12n Upon receiving the initial address message IAM, SETUP to the called terminal 14n ₁
The receiving terminal 14n ₁ sends a CALL PROC message to the service exchange point 12n in response to the SETUP message, and the service exchange point 12n sends an address completion message ACM (Address Complete Message) to the interconnect gate ICG. Also, the receiving terminal 14n ₁
Sends an ALERT message indicating that the called party is calling to the service switching point 12n, and the service switching point 12n calls the calling side service switching point 12 ₁ via the interconnect gate ICG to indicate that the called party is calling.
s) Send a message and the originating service exchange point 12
₁ sends an ALERT message indicating that a call is being made to the calling terminal 14 ₁₁ .

After that, when the called party goes off-hook, the receiving terminal 14n ₁ sends a CONN message indicating that the called party has responded, via the service switching point SSP12n → interconnect gate ICG → service switching point SSP12 _1. Notify ₁₁ . As described above, the path between the calling terminal 14 ₁₁ and the receiving terminal 14 n ₁ is established and the call becomes possible.

(F) Process of Interconnect Gate FIG. 5 is a process flow of the interconnect gate ICG when the TC-END message is received. When the TC-END message is received from the service control point SCP (step 101), the interconnect gate ICG checks by the message whether the service control point SCP is in a congestion state (step 102). If it is not in the congestion state, the call connection control is executed (step 103), and the following calling number information registration processing is performed. That is, first, the service exchange point SS on the calling side.
It is checked whether or not the calling number information is already registered in correspondence with P12 ₁ and the dial information received from the SSP 12 ₁ (step 104). If registered, the number of outgoing calls is incremented by 1 (step 105). on the other hand,
If not registered, the number of transmissions is set to 1 and the main memory 1
5c (step 106) and the calling number information is registered in the main memory 15c. That is, as shown in FIG. 3, the telephone number of the terminating terminal 14n ₁ included in the TC-END message and the SSP 12n accommodating the terminating terminal are associated with the originating service exchange point SSP 12 ₁ and the dial information. The access dial number for determining the route is registered in the main storage device 15c (step 10).
7).

On the other hand, in step 102, if the service control point SCP is in a congested state, the calling number information is stored in the storage device 15c in correspondence with the calling side service switching point SSP12 ₁ and the dial information received from the SSP 12 _1. Check if it is registered (Step 1
08). If registered, path connection control between the calling terminal 14 ₁₁ and the called terminal 14 n ₁ is performed using the calling number information (step 109). However, if not registered, the connection request for the IN service request call from the service exchange point SSP12 ₁ is rejected (step 110).
The above is the case where the service control point SCP is normal and the link between the service control point SCP and the interconnect gate ICG has not failed. However, if the service control point SCP is abnormal, or if the link between the service control point SCP and the interconnect gate ICG has failed, the link between the interconnect gate ICG and the service control point SCP cannot be established.

FIG. 6 is a processing flow of the interconnect gate ICG in such a case. The interconnect gate ICG is the calling side service exchange point SSP12.
If the IAM message is received from _1, the start message TC-BEGIN (Transaction Capabilities-BEGIN) for establishing communication is sent to the service control point SCP11, and thereafter, the link with the service control point SCP is established. It is monitored whether it has been established (step 201). When the link can be established and the TC-END message is received, the same processing as that from step 103 onward in FIG. 5 is performed thereafter.

However, if the link cannot be established and the TC-END message cannot be received, the service control point S
Assuming that the CP is abnormal or that the link between the service control point SCP and the interconnect gate ICG has a failure, the same processing as that of step 108 and thereafter in FIG. 5 is performed. That is, it is checked whether or not the calling number information is registered in the main storage device 15c in correspondence with the calling side service exchange point SSP12 ₁ and the dial information received from the SSP 12 ₁ (step 108). If it is registered, the calling terminal 14 using the calling number information
The path connection between the ₁₁ and the receiving terminal 14n _{1 is} controlled (step 109). However, if it is not registered, the connection request for the IN service request call from the service exchange point SSP is rejected (step 110). From the above, even if the service control point SCP is in a congested state, or there is a failure in the service control point SCP, or there is a link failure between the service control point SCP and the interconnect gate ICG. , Interconnect gate ICG is the main memory 15c
The calling terminal information of the IN service request call or the like can be obtained by referring to the calling number information stored in, and the calling terminal and the called terminal can be connected to improve the service.

(E) Method for reducing memory usage of main memory (e-1) Reduction by overwriting If the calling number information is stored in the main memory 15c for all IN service request calls, The memory capacity of the storage device becomes very large. Therefore, even with a small memory capacity, it is necessary to effectively connect the calling subscriber and the called subscriber in the event of congestion or failure. A first method of reducing the memory is to overwrite the oldest calling number information with the latest information when the memory is full of the calling number information. Therefore, FIG.
As shown in, the latest information pointer NIP indicating the address to write the calling number information is stored in a specific location of the main storage device 15c, and the above information is written by referring to the pointer. When the memory is full, the pointer is updated so that the latest information can be overwritten on the oldest information.

(E-2) Reduction by clearing the calling number information having a small number of callings If the number of times the calling number information has been used (calling number) within a predetermined period is small, it is stored in the main storage device 15c. There are few advantages. Therefore, the number of outgoing calls, which has a small number of outgoing calls, is periodically cleared to reduce the memory. FIG. 7 is a flow of a process of clearing the calling number information by the interconnect gate ICG. The interconnect gate ICG monitors whether the set date and time has been reached (step 30
1) When the set date and time is reached, the number of times of transmission of the i-th (the initial value of i is 1) transmission number information stored in the main storage device 15c is referred to (step 302), and the number of transmissions is equal to or greater than the set value. Is checked (step 303). If it is less than or equal to the set value, the i-th transmission number information and transmission number information are cleared (step 304). If it is more than the set value, the transmission number information is not cleared and the transmission number is set to the transmission number. Update to the value obtained by subtracting the set value from the number of times (step 30
5). The number of calls may be uniformly set to 0 initially.
After that, it is checked whether or not all the calling number information has been processed (step 306). If not completed, i is incremented and the processing from step 302 onward is repeated.

(E-3) All calling number information is periodically cleared to reduce it. All calling number information can be cleared regularly to reduce the memory. FIG. 8 is a flow chart of clearing the calling number information by the interconnect gate ICG in such a case. The interconnect gate ICG monitors whether the set date and time is reached (step 401), and when the set date and time is reached, clears all the transmission number information and the transmission number information stored in the main storage device 15c.

(F) Modified Example In the above, the service control point SCP has the telephone number of the called terminal in the network of another company and the service exchange point SS accommodating the called terminal from the dialed digits.
In this case, the access dial number for determining the route to P is obtained, and the interconnect gate ICG uses these to connect the calling terminal and the called terminal. However, the present invention can be applied not only to the connection to the networks of different companies, but also to the IN service such as toll-free connection for connecting to the called terminal number in the same network and other IN services. In the above, when the service control point SCP is in a congested state, when the link failure between the service control point SCP and the interconnect gate ICG occurs, or when the service control point SCP fails, the interconnect gate ICG is This is a case where the calling terminal and the called terminal are connected by obtaining the called number and the access dial number for determining the route to the called SSP from the calling number information stored in the main storage device. However, interconnect gate ICG
Checks whether or not the calling number information (incoming number, access dial number) for the IN service request call is stored in the main storage device, and if it is stored, the calling number information is used between the calling terminal and the called terminal. Can also be configured to request the service control point SCP to translate dial information if it is not stored. By doing so, the load on the service control point SCP can be reduced. Although the present invention has been described above with reference to the embodiments, the present invention can be variously modified according to the gist of the present invention described in the claims, and the present invention does not exclude these.

[0029]

As described above, according to the present invention,
In the intelligent network, the interconnect gate ICG uses the stored calling number information to directly connect the path between the service switching points SSP regardless of the congestion, link failure, service control point SCP failure, etc. of the service control point SCP. Can be implemented, the rejection of the service by the service control point SCP can be reduced, and the serviceability can be improved. According to the present invention, it is checked whether the calling number information (incoming number, access dial number) for the IN service request call is stored in the main storage device, and if it is stored, the calling number information is used to send the calling terminal. It is possible to reduce the load on the service control point SCP by connecting between the call receiving terminal and the called terminal and requesting the service control point SCP to translate the dial information only when not stored.

According to the present invention, the interconnect gate ICG checks, when storing the calling number information in correspondence with the dial information, whether the same contents are already stored, and if they are stored, counts the number of outgoing calls. If it is not stored and is stored, the number of transmissions is set to 1, and the transmission number information is stored in the storage device.
Since the stored information whose number of transmissions is equal to or less than the set value is cleared, only the frequently used information can be stored and the used memory amount can be reduced. According to the present invention, since the interconnect gate ICG is configured to clear all the calling number information stored in the storage device every predetermined period, it is possible to control with a small amount of used memory. According to the present invention, the interconnect gate ICG is configured to overwrite the oldest information with the latest information when the memory is filled with the calling number information. Information can be stored.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a block diagram of an intelligent network of the present invention.

FIG. 3 is a diagram illustrating a storage example of calling number information.

FIG. 4 is an explanatory diagram of a connection control sequence of an IN service request call.

FIG. 5 is a processing flow of an interconnect gate.

FIG. 6 is another processing flow of the interconnect gate.

FIG. 7 is a flow chart for clearing stored information.

FIG. 8 is another processing flow for clearing stored information.

FIG. 9 is an explanatory diagram of a conventional intelligent network.

[Explanation of symbols]

11 · service control point SCP 12 ₁ ~12n ·· service switching point SSP 13 ... telephone signaling network 14 ₁₁ ～14Ns ... subscriber terminal 15 .. Interconnect gate ICG 15c ... main memory

Claims (7)

[Claims] 1. A service control point SCP for executing control of various telephone services, and a plurality of service exchange points SSP for executing call control processing associated with the service.
A telephone signaling network to which the service control point and the service switching point are connected, a subscriber terminal connected to each service switching point SSP, and a service switching point SSP between the service switching points SSP provided in the telephone signaling network. In a call control method of an intelligent network equipped with an interconnect gate ICG for connecting between service control points SCP, when an IN service request call that requires a service to translate dialed digits into a called terminal number occurs, a calling side service The exchange point SSP sends the dial information received from the calling terminal to the service control point SCP via the interconnect gate ICG, and the service control point SCP executes the IN service processing based on the dial information to obtain the called terminal number. To the inter-connect gate ICG, and the inter-connect gate ICG controls the originating and terminating side service exchange points SSP by using the terminating terminal number received from the service control point SCP to connect the originating terminal and the terminating terminal, and The called terminal number is stored in association with the dial information, and when an IN service request call occurs, the interconnect gate ICG uses the stored information to find the called terminal number of the IN service request call, and uses the called terminal number. A call control method for an intelligent network, characterized by connecting a calling terminal and a called terminal. 2. The service control point SCP obtains an access dial number for determining a route to a receiving side SSP accommodating the called terminal from the dial information, and the interconnect gate ICG receives from the service control point SCP. Using the called terminal number and the access dial number, the service exchange point SSP on the calling side and the called side is controlled to connect the calling terminal and the called terminal, and the called terminal number and the access dial number are associated with the dial information. The information is stored in the memory.
Intelligent network call control method as described. 3. The interconnect gate I when the service control point SCP is in a connection restriction state due to congestion.
The call control method for an intelligent network according to claim 1 or 2, wherein the CG connects the calling terminal and the called terminal using the stored information. 4. When the service control point SCP fails,
Alternatively, when the link failure between the service control point SCP and the interconnect gate ICG, the interconnect gate ICG uses the stored information to connect between the calling terminal and the called terminal.
Intelligent network call control method as described. 5. The interconnect gate ICG checks whether the same content is already stored when storing the called terminal number in association with dial information, and if stored, counts up the number of outgoing calls.
If not stored, the called terminal number is stored in association with the dial information by setting the number of outgoing calls to 1, and the stored information in which the number of outgoing calls is equal to or less than the set value is cleared every predetermined period. Alternatively, the call control method of the intelligent network described in 2 above. 6. The call control method for an intelligent network according to claim 1, wherein the interconnect gate ICG clears all stored information at every predetermined period. 7. The call control method of an intelligent network, wherein the interconnect gate ICG overwrites the oldest information with the latest information in order when the stored information exceeds the memory capacity.