KR20000034605A - Method of global title translation for providing number portability intelligent network system - Google Patents

Abstract

PURPOSE: A method of global title translation for providing number portability in an intelligent network system is provided so that an exact routing of the Non-circuit Related Message can be guaranteed by efficiently dividing the data and function relating to the global title translation. CONSTITUTION: A method of global title translation for providing number portability in an intelligent network system includes several steps. A first step is to discriminate the kind of events. In the first step, if a request for receiving a message from a message transfer part (MTP) to an SCCP Routing Control (SCRC) exists, a second step is to translate a global title and transmit the translated message to other function parts (502). In the first step, if a request for receiving a message from an SCCP Connectionless Control (SCLC) to an SCCP Routing Control (SCRC) exists, a third step is to translate a global title and transmit the translated message to other function parts (515). In the first step, if a request for receiving the message from an SCCP Connectionless Control (SCLC) exists, a fourth step is to allocate a Signaling Link Selection (SLS) code and transmit the unit data message (UDT) to the SCCP Routing Control (SCRC) (518). In the first step, if a request for receiving the message from the SCCP Routing Control (SCRC) to the SCCP Connectionless Control (SCLC) exists, a fifth step is to classify the message as its kinds and transmit the message to the corresponding functions. In the first step, if a request for receiving the message from the SCCP Routing Control (SCRC) to the SCCP Connectionless Control (SCLC) exists, a fifth step is to classify the message as its kinds and transmit the message to the corresponding functions (521). In the first step, if a request for receiving the message from the SCCP Connectionless Control (SCLC) exists, a sixth step is to allocate a Signaling Link Selection (SLS) code and transmit the unit data service message (UDTS) to the SCCP Routing Control (SCRC).

Description

Global Title Translation Method for Providing Number Portability in Intelligent Network System.

The present invention relates to a configuration of a communication network function for providing telephone number mobility in an intelligent network system, a method of processing a signal message, and a computer-readable recording medium having recorded thereon a program for realizing the same.

In general, many methods have been proposed to provide phone number portability for handling Calls from a calling party to a specific number of a called party.

Although the number portability of the message related to the dual line has been specifically announced in various ways, the number portability of the non-line related message is currently under review and no specific signal processing method has been announced.

In other words, Number Portability (NP) for routing of Circuit Related Messages has been specifically published in several ways. For the most representative method (s), a specific signal processing method and procedure have been determined, and the called number is divided into a routing number and a called party number. This routing number is obtained by searching the number portability database with dialed numbers. Line-related number portability comes in a variety of ways depending on the location, routing, and so on of the database.

However, the method of number portability for routing of non-circuit related messages is currently being reviewed by national standards bodies and international standards bodies (ITU-T, ETSI, etc.), and the specific signal processing is still underway. Methods and procedures have not been published.

In order to ensure accurate routing of non-line related messages in a telephone network environment where number portability is provided, a conventional Signaling Connection Control Part (hereinafter referred to as "SCCP") Global Title Translation (hereinafter referred to as "GTT") It is indispensable to expand the digit to be processed.

Directory Number (DN) consists of area code, telephone number and subscriber number. However, the service subscriber number in a mobile communication service or an intelligent network service is a non-geographic number, and its configuration is somewhat different.

With the introduction of number portability, this phone number is no longer sufficient to route signaling messages to the actual recipient exchange.

In No.7 signaling, both line and non-line related messages are routed between the corresponding systems through the signaling network.

Non-line-related messages can also be routed to the terminating system with a global title (GT) such as a telephone number, but for routing within the signaling network they must be translated into the addressing system used within the signaling network.

Signaling network address system is Signaling Point Code (SPC) that distinguishes node (system) in Signaling Network and Subsystem Number which distinguishes application located in each signal point (Hereinafter referred to as "SSN").

This global title translation has been handled through the GTT function and related GTT table in the SCCP protocol, and the global title can be translated by the block unit (area code, area code + telephone number, etc.).

In the number portability environment, this generic name itself is also capable of number transfer, and thus, the GTT is inevitably processed in units of individual generic names, thus increasing the number of target generic names to be processed.

However, if the overall name is managed in individual units, the length of the SCCP GTT table is increased by 10,000 times in the worst case compared to the case of managing in the unit of blocks.

That is, in the prior art as described above, in order to support non-line related number portability, the global title translation is inevitably provided as an individual unit, but the related global title (all digits) is included in the SCCP GTT table for the global title translation in this form. It is almost impossible to register all of them, and even if it is possible, it causes a lot of systemic problems to properly handle GTT performance in the SCCP protocol. When the SCCP GTT function is handled as an individual unit, there is a problem that it is difficult to efficiently manage related functions and data accompanying the expansion of the GTT.

SUMMARY OF THE INVENTION The present invention devised to solve the above problems is a computer-readable recording of a general title translation method for efficient division of related functions and data accompanying an extension of a global title translation and a program for realizing the same. The purpose is to provide a medium.

1 is a configuration diagram of an embodiment of an intelligent network system to which the present invention is applied.

Figure 2 is a configuration diagram of one embodiment of a global title translation data to which the present invention is applied.

Figure 3 is a conceptual diagram of an embodiment of a global title translation of the No.7 signal connection control protocol to which the present invention is applied.

Figure 4 is a configuration diagram of an embodiment of No.7 signal connection control protocol to which the present invention is applied.

5A and 5B are an embodiment flowchart of a No. 7 signal connection control protocol including a global title translation according to the present invention.

6 is a parameter definition table of an N-UNITDATA ind primitive of a No. 7 signal connection control unit according to the present invention;

7 is a parameter definition table of an N-NOTICE req primitive of a No. 7 signal connection control unit according to the present invention;

8 is a flowchart illustrating a translation related embodiment of a number portability global title translation unit to which the present invention is applied.

9A to 9F are transition diagrams of a global name translation process and a routing process of a non-line related message to which the present invention is applied.

According to an aspect of the present invention, there is provided a general name translation method for providing number portability in an intelligent network system, comprising: a first step of a signal connection controller (SCCP) determining an event type from an event waiting state; In the first step, if there is a message reception request from the message transfer unit (MTP) to the routing control unit (SCRC), performing a global name translation procedure, and transmitting the corresponding message to another functional unit; In the first step, if there is a message reception request from the unconnected control unit (SCLC) to the routing control unit (SCRC), performing a global name translation procedure, and transmitting the corresponding message to another functional unit; A fourth step of allocating a signal link selection (SLS) code and transmitting a unit data (UDT) message to the routing control unit when a message reception request is received by the unconnected control unit (SCLC); In the first step, if there is a message reception request from the routing control unit (SCRC) to the non-connection control unit (SCLC), the fifth step of classifying by message type to the functional unit; And a sixth step of allocating a signal link selection code (SLS) code and transmitting a unit data service (UDTS) message to the routing control unit when a message reception request is received from the connectionless control unit (SCLC). Include.

In addition, the present invention is the first to the signal connection control unit (SCCP) determines the type of event from the event waiting state in the switching transmission system having a large capacity processor for the overall title translation for providing number portability in the intelligent network system function; In the first function, if there is a message reception request from the message transfer unit (MTP) to the routing control unit (SCRC), performing a global name translation procedure, and transmits the message accordingly accordingly; In the first function, if there is a message reception request from the unconnected control unit (SCLC) to the routing control unit (SCRC), a third function for performing a global name translation procedure, and transmits the message accordingly; A fourth function of allocating a signal link selection (SLS) code and transmitting a unit data (UDT) message to the routing control unit when a message reception request is made to the unconnected control unit (SCLC); In the first function, if there is a message reception request from the routing control unit (SCRC) to the connectionless control unit (SCLC), the fifth function for classifying by message type to transfer to the corresponding function unit; And a sixth function in the first function, assigning a signal link selection (SLS) code to the connection control controller (SCLC) and delivering a unit data service (UDTS) message to the routing controller. A computer readable recording medium having recorded thereon a program for realization is provided.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. 1 to 9.

1 is an embodiment configuration diagram of an intelligent network system to which the present invention is applied, which includes all functions for circuit-related and non-line-related message routing.

As shown in the figure, the intelligent network system includes a number portability database (hereinafter referred to as "NP DB") 101, an NP application 102, and a basic call processing unit (hereinafter, referred to as "NP application"). Basic Call Control "(103), a comprehensive information network user unit (ISDN User Part (hereinafter referred to as" ISUP ") 104, a message transfer part (hereinafter referred to as" MTP ") (105) Application Entities (hereinafter referred to as "AE") 106, Transaction Capability Application Part (hereinafter referred to as "TCAP") 107, Signaling Connection Control Part: It is composed of a "SCCP" (108), a mobility global title translation function (hereinafter referred to as "NP GTT") 110, a global title database (hereinafter referred to as "GTT DB") 109, The SCCP 108 includes a global name translation table (GTT Table).

In the above configuration, the GTT DB and NP GTT is added separately from the SCCP with respect to the non-line message routing.

In other words, GTT DB must be separately constructed to manage the target overall title.

There is also a GTT table within the SCCP protocol, which only serves as an index table for accessing the GTT DB.

Including these three functions, a method of distributing all the functions of FIG. 1 in a real network may appear in various ways, which have been described with reference to FIGS. 9A to 9F.

2 is a block diagram of an embodiment of a global title translation data to which the present invention is applied.

That is, in order to support non-line related number portability, GTT data is distributed to the SCCP GTT table 211 and the GTT DB 109. FIG. 2 illustrates the configuration and relationship of these GTT data.

The GTT DB 109 includes a ported number table (hereinafter referred to as "Ported Number Tables") 201 including routing information of the actual subscribers, and a decoded number table (hereinafter, referred to as "Ported Number Tables"). Non-ported number table "(202).

In the Ported Number Table 201 of the figure, the TE 207 is a signal point code (Point Code: "PC") of the Transit Exchange, and the LE 206 is a Local Exchange. PC, GT'210 in the non-ported number table 202 is the new global title (NEW GT).

The SCCP GTT table 211 of the SCCP 108 includes routing information or location information of the GTT DB for each global title number block.

In the SCCP GTT table 211 of the figure, the S * P 208 is a service switching point (hereinafter referred to as "SSP") / signaling transfer point (hereinafter referred to as "STP") equipped with NP GTT / PC of the service control system (hereinafter referred to as "SCP"), NP GTT 209 is the SSN of NP GTT.

If the given global name belongs to a non-portable number block, it instructs the MTP to route with routing information in this table (203).

However, if this given generic name belongs to a Portable Number Block, it must be retrieved from the GTT DB 109 to ascertain whether the generic name is actually a ported number or an implied number (204).

First, the ported number table 201 in the GTT DB 109 is searched to obtain routing information about the corresponding general name. However, if the corresponding general name does not exist in this table, the subscriber using this general name is a temporary subscriber, so in order to provide the existing routing information, the non-ported number table 202 should be searched (205).

3 is a conceptual diagram of an embodiment of a global title translation of a signal connection control protocol to which the present invention is applied.

As shown in the figure, when the SCCP 108 receives a message from the MTP 105 (the called party's address is a generic name) (301), it is referred to as the Nature of Address Indicator (NAI). (302).

If the NAI is indicated by a portable number (hereinafter referred to as "PN"), it directly delegates the translation of the global title to the NP GTT. This is possible because other systems have already performed the SCCP GTT related preliminary procedures 303-306.

However, if the NAI test result (302) is not a PN, SCCP GTT should be performed (303).

If the translation result is a non-portable number (hereinafter referred to as " NPN "), the MTP 105 is instructed to route (203).

If the translation result is a mobility number, the general name translation should be requested to NP GTT 110.

Examine the signal point (Destination Point Code: "DPC") where this NP-GTT function is located (305) and request NP-GTT immediately if it is in this system, and if it is in another system, Set to PN and route to that DPC.

4 is a configuration diagram of an embodiment of No. 7 signal connection control protocol to which the present invention is applied.

The SCCP 108 protocol is largely an SCCP routing control (hereinafter referred to as "SCRC") 401, an SCCP connection-oriented control (hereinafter referred to as "SCOC") 402, and an SCCP disconnection. The control unit (SCCP Connectionless Control: hereinafter referred to as "SCLC") 403 and the SCCP management unit (SCCP Management: referred to as "SCMG") (404).

SCCP user 405 may be a higher protocol or application using the SCCP protocol, which may be NP application 102, NP GTT 110, or respective application entities 106 of FIG. 1, which are subsystems. It is divided into a number (Subsystem Number: hereinafter referred to as "SSN").

In order to support the non-line related number portability in the SCCP 108, the processing procedure and the interface of the SCRC 401 and the SCLC 403 functional blocks must be changed. The GTT process of the SCCP protocol of FIG. 3 will be described in detail with reference to FIGS. 5A and 5B for each SCCP functional block.

5A and 5B are flowcharts of one embodiment of a No.7 signal connection control protocol including a global title translation according to the present invention, and FIG. 5A is an embodiment flowchart according to a global title translation in an SCCP routing controller, and FIG. 5B. Is a flowchart illustrating an embodiment of a global title translation in an SCCP connectionless controller.

First, the SCCP waits for the occurrence of an event in an event waiting state (501).

Upon receiving an MTP-Transfer ind message from MTP 105 (502), the SCCP portion of the message is decoded (503).

If the message is routed to a GT (general name) (504), then the GT's NAI (address personality) is checked (505). If the NAI is a Portable Number (PN), then normally, specify the SSN as NP GTT, store the original-SSN (SSN) of the message 502 received from the MTP (508), and then signal points and subsystems. In step 509, the SCCP message is delivered to the SCLC 403 function block.

If the NAI is not a PN, GTT (Global Title Translation) is performed (506).

As a result of the translation, if the general name is determined to belong to the Portable Number Block (507), the original AI-SSN of the message 502 received from the MTP is designated as the NAI of this GT as the PN and the SSN as the NP GTT. store (original-SSN) (508).

After performing the signaling point and subsystem status checking procedure (509), it will be delivered to the SCLC (403) function block, and when delivering the message to SCLC (511), the original-SSN stored in step 508 It should also be delivered (511).

On the other hand, if the SCRC 401 functional block receives a connectionless message from the SCLC 403 functional block (513), only after the corresponding incoming signal point code (SPC) does not exist (514) after performing the GTT procedure (515) After performing the signaling point and subsystem status check procedure (509), it will be forwarded to another system via the MTP protocol (512).

If an N-unit data request (N-UNITDATA req) is received from the SCCP user 405 (516), or if a transmission of an SCMG (SCCP Management) message is requested from the SCMG 404 function block (517), a signal is generated according to the relevant rules. After assigning a Signaling Link Selection (SLS) code (518), a unit data (UDT) message is transmitted to the SCRC 401 (519).

When a connectionless message is received from the SCRC 401 function block (520), the type of the message is checked (521).

N-NOTICE ind is sent to the SCCP user 405 if it is a unit data service (UDTS) message (522), and N-unit data is sent to the SCCP user 405 if it is a general unit data (UDT) message. In operation 523, the UE transmits a confirmation (N-UNITDATA ind), and transmits the corresponding SCMG message to the SCMG 404 function block if it is SCMG unit data (UDT) (524).

When an N-NOTICE req is received from the SCCP user 405 (525), an SLS code is allocated (529), and a unit data service (UDTS) message is forwarded to the SCRC 401 (530). .

If the SCRC 401 receives a notification that the routing has failed from the function block (526), and if the message is a unit data (UDT) message and the return has been selected (527), a unit data service (UDTS) message is generated (528). The SCRC 401 transmits this to the function block (530).

6 is a parameter definition table of the N-UNITDATA ind primitive of the signal connection control unit according to the present invention, and FIG. 7 is an N-NOTICE req of the signal connection control unit according to the present invention. A parameter definition table for primitives.

As part of the GTT function of the SCCP 108 is delegated to the NP GTT 110, the SCCP will forward the connectionless message inputted by the procedure 511 of FIG. 5A and procedure 520 of FIG. 5B to the NP GTT 110. At 523, all information on this message must be conveyed.

Therefore, the N-UNITDATA ind primitive is redefined as shown in FIG.

Conventional N-UNITDATA ind primitives do not include the "Sequence Control" and "Return Option" parameters, but the N-UNITDATA req primitive. It should be included as in

In addition, the “Called Party Address (CdPA)” parameter should also include the original-SSN stored in the procedure 508 of FIG. 6.

In addition, when the GTT process 506 in the SCCP 108 fails, the NP GTT 110 should correctly process the function of carrying it back to the calling party. Therefore, even if the NP GTT function fails to translate the global title, a new interface between the NP GTT and the SCCP is needed to return the message to the calling party. For this purpose, the N-NOTICE req primitive of FIG. 7 has been newly defined and returned to the calling party through procedures between Nos. 525 and 530 of FIG. 5B and between Nos. 513 and 512 of FIG. 5A.

8 is a flowchart illustrating a translation related embodiment of a mobility general name translation unit to which the present invention is applied.

Once delegated to the global title translation from the SCCP 108, it retrieves the corresponding Ported Number Table 201 in units of 10 digits (801).

If the corresponding general name exists in this table (802), routing is controlled by the new routing address (803).

However, if there is no general name in the ported number table 201, the non-ported number table 202 is searched for in the general name block (804), and the existing destination address is searched. To control routing (806).

However, if it does not exist in this table (805), it is controlled to return the message to the calling party (807).

9A to 9F are transition diagrams of a global name translation process and a routing process of a non-line related message to which the present invention is applied.

FIG. 9A illustrates a case where there is no NP GTT function in the network, FIG. 9B illustrates a case where STP delegates GTT processing to SCP, and FIG. 9C illustrates a case where STP requests GTT to SCP. 9D is a case where the called party's address is determined to be a non-mobile number, FIG. 9E is a case where the called party is determined to be an intermittent number, and FIG. 9F is a case where the STP processes all the NP GTTs.

In FIG. 1, a non-line related message processing and routing process is developed differently according to how GTT related functions / data, ie, SCCP GTT Table 111, NP GTT 110, and GTT DB 109 are arranged in a network.

These functions / data can be arranged in the SSP, STP or SCP all within the network, but since it is difficult to arrange in the SSP, FIG. 9 has described various cases except for the case in the SSP.

In the drawing, the SCCP version is classified as follows according to the GTT function and data configuration.

In other words, SCCP-I is the existing SCCP which does not consider the number portability at all, SCCP-II is the SCCP which has maintained only the contents of the GTT Table to delegate the GTT function to SCP, and SCCP-III is the number portability to SCCP-II. This SCCP accepts the SCCP signal processing procedure. In addition, SCCP-IV refers to a case where a higher NP GTT function and a GTT DB exist in the system in SCCP-III.

In particular, as shown in the figure, the procedure is defined so that SCRC and SCLC functional blocks within the SCCP protocol can be processed even if GTT-related functions and data are freely configured in STP and SCP, and the interface between SCCP and NP GTT is newly defined. It was.

In general, the number of SSP: STP: SCP systems in the network is shown in a ratio such as 100: 10: 1, so that one SCP can be changed without changing the SSP or STP's software (S / W) and hardware (H / W). Building a bay can ease the deployment of your network.

However, STP delegates GTT to SCP, which increases the number of hops when routing messages. How this is done depends on the decision of the network operator.

As described above, the present invention devised a signal processing procedure and method of the SCCP protocol so that the GTT function and data can be properly processed regardless of how the GTT function and data are configured in the network.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains, and the above-described embodiments and accompanying It is not limited to the drawing.

According to the present invention as described above, in the number portability environment, in particular, it is possible to efficiently manage and manage the related functions accompanying the expansion of the GTT function according to the number portability scheme of non-line related messages, and to accurately route the non-line related messages. There is an excellent effect to ensure that.

Claims (9)

In the global name translation method for providing number portability in an intelligent network system, A first step of the signal connection control unit (SCCP) determining an event type from an event waiting state; In the first step, if there is a message reception request from the message transfer unit (MTP) to the routing control unit (SCRC), performing a global name translation procedure, and transmitting the corresponding message to another functional unit; In the first step, if there is a message reception request from the unconnected control unit (SCLC) to the routing control unit (SCRC), performing a global name translation procedure, and transmitting the corresponding message to another functional unit; A fourth step of allocating a signal link selection (SLS) code and transmitting a unit data (UDT) message to the routing control unit when a message reception request is received by the unconnected control unit (SCLC); In the first step, if there is a message reception request from the routing control unit (SCRC) to the non-connection control unit (SCLC), the fifth step of classifying by message type to the functional unit; And In the first step, when there is a message reception request to the unconnected control unit (SCLC), a sixth step of assigning a signal link selection (SLS) code, and delivering a unit data service (UDTS) message to the routing control unit Global title translation method comprising a. The method of claim 1, The second step, A seventh step of decoding the signal connection control part of the message transmitted from the message transfer unit (MTP), and determining whether the message is a global title; As a result of the determination in the seventh step, if the message is not routed with the general name, the state of the signal point and the subsystem is examined, and if the message is routed with the general name, the eighth of judging whether the address personality of the overall name is a movable number. step; As a result of the determination in the eighth step, if the address personality of the general name is a movable number, the original subsystem number (SSN) is stored; if the address personality of the general name is not a movable number, the general name translation is performed, and the general name is mobility. A ninth step of determining whether it belongs to the number block; As a result of the determination in the ninth step, if the overall name does not belong to the mobility number block, the state of the signal point and the subsystem is examined. If the overall name belongs to the mobility number block, the address personality is designated as the mobility number and the original sub is assigned. A tenth step of specifying a signal point and a state of a subsystem after storing a system number, and determining whether a destination of a message is the unconnected control unit; And As a result of the determination of the tenth step, when the destination of the message is the non-connection control unit, the message is delivered to the non-connection control unit; and if the destination of the message is not the non-connection control unit, the eleventh step of transferring the message to the message transfer unit. Global title translation method comprising a. The method of claim 1, The third step, A seventh step of determining whether an incoming signal point code exists by receiving a message from the unconnected control unit (SCLC); As a result of the determination in the seventh step, if the incoming signal point code exists, the state of the signal point and the subsystem is checked, and if the corresponding signal point code does not exist, general name translation is performed and the state of the signal point and the subsystem An eighth step of determining whether the destination of the message is the unconnected control unit; And As a result of the determination of the eighth step, when the destination of the message is the non-connection control unit, the message is delivered to the non-connection control unit; and if the destination of the message is not the non-connection control unit, the ninth step of transferring the message to the message transfer unit. Global title translation method comprising a. The method of claim 1, The fourth step, A seventh step of allocating a signal link selection code and transmitting a unit data message to the routing control unit when a data reception request is received from the signal connection control unit (SCCP) user; And An eighth step of allocating a signal link selection code and transmitting a unit data message to the routing control unit when a message reception request is received from the management unit SCMG; Global title translation method comprising a. The method of claim 1, The fifth step, A seventh step of receiving a message from the routing control unit (SCRC) and determining a type of the message; An eighth step of transmitting an N-notification confirmation to the signal connection control unit user if the message of the seventh step is a unit data service (UDTS) message; A ninth step of transmitting the N-unit data confirmation to the signal connection control unit user if the message is a general unit data message as a result of the determination in the seventh step; And A tenth step of delivering a message to the management unit if the message is a management unit data message; Global title translation method comprising a. The method of claim 1, The sixth step, A seventh step of receiving an N-notification request message from the signal connection control unit (SCCP) user, assigning a signal link selection code, and delivering a unit data message to the routing control unit; An eighth step of receiving a routing failure notification message from the routing control unit (SCRC) and determining whether the corresponding message is a unit data message and a return is selected; And As a result of the determination in the eighth step, if the corresponding message is a unit data message and the return is not selected, the event goes to the event waiting state. A ninth step of allocating a code and delivering a unit data service message to a routing control unit Global title translation method comprising a. The method of claim 5, Wherein the N-UNITDATA ind primitive of the ninth step includes an order control and a return selection parameter. The method of claim 6, And wherein the N-NOTICE req primitive of the seventh step includes a called party address, a calling party address, a cause of return, and a user data parameter. In a switched transmission system having a large capacity processor for global title translation for providing number portability in an intelligent network system, A first function of the signal connection control unit (SCCP) determining an event type from an event waiting state; In the first function, if there is a message reception request from the message transfer unit (MTP) to the routing control unit (SCRC), performing a global name translation procedure, and transmits the message accordingly accordingly; In the first function, if there is a message reception request from the unconnected control unit (SCLC) to the routing control unit (SCRC), a third function for performing a global name translation procedure, and transmits the message accordingly; A fourth function of allocating a signal link selection (SLS) code and transmitting a unit data (UDT) message to the routing control unit when a message reception request is made to the unconnected control unit (SCLC); In the first function, if there is a message reception request from the routing control unit (SCRC) to the connectionless control unit (SCLC), the fifth function for classifying by message type to transfer to the corresponding function unit; And In the first function, a sixth function of allocating a signal link selection (SLS) code and transmitting a unit data service (UDTS) message to the routing controller when a message reception request is received from the SCLC. A computer-readable recording medium having recorded thereon a program for realizing this.