KR20010008694A - Method for generating statistical information of layer2/layer3 for abnormal state in processing packet call procedure of full electronic exchange - Google Patents

Abstract

PURPOSE: A method of generating layer2/layer3 statistic information is provided to recover from an abnormal state quickly by processing causes to the abnormal state into information capable of being discriminated by an exchange manager. CONSTITUTION: In a method of generating layer2/layer3 statistic information, when a layer2 set completion and call set request packet is received, a database is accessed to judge a state of an originating subscriber, and statistic information to originating call fail is generated so as to be reported to a statistics block when the originating subscriber is at a speech stop state or an originating inhibition state(ST11). When an abnormal state is generated at performing an X.25 originating layer3 protocol, statistic information is generated and collected(ST12). If contents to terminating layer2 set wrong or contents to terminating logic channel allotment wrong are reported from a terminating side for performing a terminating process procedure, statistic information associated therewith is generated(ST13).

Description

Method for generating statistical information of layer2 / layer3 for abnormal state in processing packet call procedure of full electronic exchange}

The present invention relates to a method of generating statistical information on an abnormal state occurring during packet call processing of a full electronic exchange, and in particular, to quickly identify and recover the cause of an abnormal state generated during packet call processing. The present invention relates to a method for generating abnormal state statistical information so as to generate statistical information about an abnormal state of a communication protocol specific layer.

In general, the packet protocol processing function of an electronic switching system enables a subscriber to access a database connected to a Public Switching Data Network (PSDN) or an ISDN using a packet protocol to receive a data transmission service. Make sure

The function of controlling packet calls using the X.25 protocol is performed via several steps of protocol procedures. Therefore, there is a high probability that an abnormal state will occur.

In addition, the packet call control function is performed by performing several steps of protocol procedures. When abnormal state of each layer occurs, statistics of information about it are not generated and collected, so it is not easy to identify the cause even if an abnormal state occurs continuously in a specific layer. . And it took a lot of time to recover from the abnormal state.

Accordingly, the present invention is to solve the problem caused by not generating information on the abnormal state generated between the layers or within the layer when the X.25 protocol processing of the electronic switch as described above,

An object of the present invention is to identify and exchange the causes of abnormal states occurring between layers or within layers for each state for processing procedures inside an electronic switch for X.25 protocol processing. It provides a method for generating layer 2 / layer 3 statistical information on an abnormal state during packet call processing of an electronic switchboard that enables the rapid recovery of an abnormal state by using information processing, and can be used as basic data in network design. have.

In order to achieve the above object, the method for generating layer 2 / layer 3 statistical information on an abnormal state during packet call processing of an electronic switching system according to the present invention,

When the call setup request is made from the subscriber and the calling layer 2 setup completion and call setup request packet are received, the database is accessed to determine the state of the calling subscriber. Generating statistical information relating to the statistical block of an operation and maintenance processor (OMP) in charge of the maintenance of the electronic switchboard;

Generating and collecting statistical information when an abnormal state occurs while performing the X.25 calling layer 3 protocol;

When the called party performing the incoming processing procedure is notified of the inability to set up the terminating layer 2 or is notified of the inability to assign the terminating logical channel, a third step of generating statistical information about the terminating logical channel assignment is performed.

A fourth step of accessing a called party database to check a state of a called party and generating statistical information on an incoming call failure and notifying the statistical block of the OMP if the called party is in a call stopped state or a do not receive state as a result of the test;

A fifth step of generating and notifying statistical information about the settable notification if the set of the called party's layer 2 is impossible;

A sixth step of generating and notifying statistical information about an incoming logical channel allocation impossibility notification;

When an abnormal state occurs when performing the X.25 incoming packet layer 3 protocol, a seventh step of generating statistical information on the abnormal state and transmitting the same to the statistical function block is performed during the incoming processing procedure.

The second step may include: generating and collecting statistical information about an abnormal state when the call establishment request packet is in an error state as a result of verifying a call_request packet transmitted for a call request from an originating terminal; After verifying the call_connect packet indicating that the call connection with the called party is successfully made to the calling terminal, if the call connection packet is in an error state, generating and collecting statistical information on an abnormal state. It features.

The seventh step may include: generating and collecting statistical information on an abnormal state when the incoming call packet is in an error state as a result of verifying an incoming call packet informing the called terminal that an incoming call is requested; And generating statistical information about an abnormal state when the call reception packet is in an error state as a result of verifying the call reception packet that is a response from the called terminal receiving the incoming call packet.

1 is a block diagram of an all-electronic exchanger to which the present invention is applied;

2 is a flowchart illustrating a method for generating layer 2 / layer 3 statistical information on an abnormal state in a packet origination signal processing of an electronic switch according to the present invention;

3 is a flowchart illustrating a method for generating layer 2 / layer 3 statistical information on an abnormal state in a packet incoming call processing of an electronic switching system according to the present invention;

4A is a flowchart illustrating a method for generating / collecting outgoing subscriber state abnormality information of FIG. 2;

4b is a flowchart illustrating a method of generating / collecting X.25 originating layer 3 abnormal state information of FIG. 2;

FIG. 4C is a flowchart illustrating a method of generating / collecting called party abnormal state information of FIG. 2; FIG.

4d is a flowchart illustrating a method for generating / collecting called party abnormal state information of FIG. 3;

FIG. 4E is a flowchart showing a method of generating / collecting X.25 destination layer 3 abnormal state information in FIG. 3; FIG.

Hereinafter, the method of generating layer 2 / layer 3 statistical information on an abnormal state in the packet call processing of the electronic switch of the present invention as described above will be described in detail with reference to the accompanying drawings.

The packet call control function using the X.25 protocol is carried out through a multi-step protocol procedure. The present invention utilizes the information generated during the procedure as the basic data of statistical information, and redesigns the system during operation. If so, use it as basic data.

1 is a block diagram of an all-electronic exchanger to which the present invention is applied.

Reference numeral 1 is a data terminal equipment (DTE) which is an ISDN subscriber terminal, and 2 is a terminal adapter (hereinafter, abbreviated as "TA") for matching the DTE 1 with the ISDN. 3 is a sub-system responsible for digital subscriber matching exchange (hereinafter abbreviated as "TCS_I"), 4 is an interconnection network subsystem (INS) of the ISDN switching system, and 5 is packet matching. Telephony Control Subsystem for Packet Switching (TCS_P), and 6 is a data base (DB) in which subscriber data is stored. 7 is the Central Control Subsystem (CCS), a subsystem that performs centralized operation and maintenance of the exchange.

3a is a Frame Multiplexing Communication Board Assembly (FMCA) for multiplexing the frames from the TA (2), 3b is a Frame Multiplexing Processor Board Assembly (FMXP) for controlling the FMCA 3a, and 3c Is a time switch (TSW) for performing time switching on the internal packet of the TCS_I (3), 3d is a time switch processor (TSP) for controlling the TSW 3c, and 3e is Telephony Control Processor for ISDN (TCP_I).

4a is a switch (S-SW) for exchanging packets between each subsystem (3) (5) in the ISDN switching system, 4b is a processor (SSP) for controlling the switch (S-SW) 4a, 4c is an Interconncetion Network Processor (INP) that controls the internal network of the ISDN switching system, and 4d is a Number Translation Processor (NTP).

5a is a Telephony Control Processor for Packet (TCP_P) in charge of the packet subscriber access exchange, 5b is a time switch (TSW) for switching packets inside the TCS_P (5) under the control of the TCP_P (5a), and 5c Is a time switch processor (TSP) for controlling the TSW 5c, 5d is a packet handling module (PHM) for packet processing from the TCP_P 5a, and 5e is transmitted from the PHM 5d. A packet layer control processor (PLCP) for controlling a packet layer for a packet to be transmitted.

7a is an OMP (Operation and Maintenance Processor) which is located in the CCS 7 and is a processor for system-wide maintenance, network management, billing, statistics, and database management.

A description will be given of a software block that must reside in each processor inside a switch for processing B-channel packets in such an electronic switch.

The TCP_I (3e) resides in the Digital Subscirber Packet Mode Control (DPC) that is responsible for digital subscriber packet mode control, and the NTP (4d) resides in NTR (Number TRanslation) which is responsible for general number translation. The TCP_P 5a includes a packet inward call control (PIC) that performs packet call control / verification and a packet call direction control (PDC) that performs packet call number translation.

The PHM 5d resides in the B-Channel X.25 Protocol Handler (B25H), which is responsible for performing the link layer and packet layer of the X.25 protocol for the B channel, and the B channel packet in the PLCP 5e. B-Channel Packet Call Control (BPCC) in charge of call control resides.

The OMP 7a resides in a statistical block software block for collecting and managing operational data and statistical data for operational maintenance of the exchange.

In order to help the understanding of the present invention, a packet call processing operation performed in the above-mentioned electronic switch is described as follows.

If call setup is requested from the subscriber first, the originating procedure is performed. Therefore, when the source layer 2 setup complete and the call setup request packet are received, the state of the calling subscriber is determined by reading the information on the calling subscriber by accessing the database. As a result of this determination, if the line for the calling subscriber is not mounted, the call release request is made. If the line is mounted, the call release request is checked. Therefore, the call setup request packet is verified if the subscriber is capable of generating the outgoing call, and the call release request is made if the subscriber is prohibited from generating the outgoing call due to the late payment.

If the call setup request packet verification result indicates that the call setup request packet is transmitted in an abnormal format, an error content of the call setup request packet is notified and the generation of the outgoing call is stopped. If the call setup request packet is sent in the normal format, number translation is required. Therefore, when notified of the translation result of the called party number, the receiving party requests the establishment of the physical path of the called party and starts the incoming call procedure.

Therefore, when the called party physical path is established, the called subscriber database is accessed to read information about the called subscriber, and then the called subscriber line is checked. At this time, if the line of the called subscriber is not mounted, a physical path release request is made. If the line of the called subscriber is mounted and an incoming signal can be generated, it is checked whether the called party is prohibited from receiving due to late payment. If the result of the check is prohibited, the incoming process is not created. If the inspection is not prohibited, the incoming process is created.

The created terminating process allocates the terminating logical channel and notifies the result, and also makes a terminating link establishment request for terminating layer 2 establishment. After the notification of the incoming link establishment result, the mobile station transitions to the incoming call packet verification wait state.

On the other hand, if the incoming logical channel allocation result is notified during the transmission processing procedure, the call establishment request packet is verified and the result is notified, and then the call connection packet is verified and the result is notified. The information on the calling subscriber is notified to the called party who performs the incoming call processing procedure.

On the other hand, if the incoming packet packet verification request is received during the incoming processing procedure, the incoming call packet is verified and if the normal packet is transmitted, the incoming packet packet verification result is transmitted through reassembly of the incoming packet. However, if an abnormal packet is transmitted, an incoming call packet error notification is transmitted to reject the incoming call generation and request the physical path release.

Thereafter, when the calling party receives the calling party information from the calling party which performs the calling processing procedure, it transitions to the call reception packet verification request waiting state. When the call reception packet is received from the called terminal receiving the incoming call packet, the call reception packet is verified. If an abnormal call reception packet is received as a result of the verification, the call reception packet error is notified and the physical path release request is rejected. However, if the call reception packet is normal, the verification result is notified after reassembling the call reception packet. Upon receiving the data transmission status notification from the calling party, the called party also transitions to the data transmission status.

On the other hand, when the originating party that performs the originating process receives the verification request for the call access packet, it decomposes the call access packet, verifies the packet, and notifies the result of the call to notify the originating terminal. If the call connection packet verification result is not normal, the call connection packet error is notified and the physical path release request is made to release the call. However, if the call connection packet verification result is normal, the result is notified and the calling party informs the called party that the calling party has transitioned to the data transmission state and then transitions to the data transmission state.

Through such general outgoing call processing and incoming call processing, the calling party and the called party are connected to each other so that data can be transmitted.

FIG. 2 illustrates a method of generating statistical information on an abnormal state generated in each layer when performing a procedure of an electronic switch for processing an X.25 protocol among such packet call processing procedures for a packet service.

As shown in the figure, the method for generating layer 2 / layer 3 statistical information on an abnormal state during packet call processing of an electronic switching system according to the present invention,

When the call setup request is made from the subscriber and the calling layer 2 setup completion and call setup request packet are received, the database is accessed to determine the state of the calling subscriber. A first step (ST11) of generating statistical information relating to the statistical block of the OMP; A second step (ST12) of generating and collecting statistical information when an abnormal state occurs while performing the X.25 source layer 3 protocol; When the called party performing the incoming call processing procedure is notified of the inability to set up the terminating layer 2, or the notification of the inability to assign the called logical channel, the third step (ST13) of generating statistical information on this is performed in the call processing procedure. and,

A fourth step (ST21) of accessing the called party database to check the status of the called party and generating statistical information on the incoming call failure when the called party is in the stopped state or the do not disturb state and notifying the statistical block of the OMP; ; A fifth step (ST22) of generating and notifying statistical information on the notification of the setting failure if the destination layer 2 setting is impossible; A sixth step (ST23) of generating and notifying statistical information about an incoming logical channel allocation impossibility notification; X.25 Incoming Packet Layer 3 When an abnormal condition occurs during the execution of the protocol, a seventh step (ST24) of generating statistical information on the abnormal condition and transmitting it to the statistical function block is performed in the incoming processing procedure.

As shown in FIG. 4B, if the call setup request packet is in an error state, the second step ST12 generates statistical information on an abnormal state when the call setup request packet transmitted from the originating terminal is verified. Collecting step ST12a; A step of generating and collecting statistical information on an abnormal state when the call connection packet is in an error state as a result of verifying a call_connect packet indicating that the call connection with the called party has been successfully made to the calling terminal (ST12b). Perform

As shown in FIG. 4E, in the seventh step ST24, when the incoming call packet is in an error state as a result of verifying the incoming call packet indicating that the incoming call is received by the called terminal, statistical information about an abnormal state is shown. Generating and collecting ST24a; If the call reception packet is an error state as a result of the verification of the call reception packet, which is a response from the called terminal receiving the incoming call packet, the method generates and collects statistical information on an abnormal state (ST24b).

A method of generating layer 2 / layer 3 statistical information on an abnormal state during packet call processing of an electronic switch according to the present invention will be described as follows.

The present invention has two characteristics due to the nature of call processing, and the type of generating each information is also generated differently, which is divided into a case of collecting information by origination processing and a case of collecting information by incoming processing.

When a call setup request from the originating terminal receives the call setup request packet of the originating layer 2, the database is accessed to read the information on the calling subscriber to determine the status of the calling subscriber. As a result of verifying the status of the calling subscriber, the calling procedure is stopped if the corresponding subscriber is in a stopped state for reasons such as call ban. Then, statistical information related to the failed signaling is generated and transmitted to the statistical block of the OMP 7a (ST11a). However, if the calling subscriber is in a normal state capable of making a call, it checks whether or not the call is registered. If the calling subscriber is in the call prohibition state, statistical information related to the call failure is generated and notified to the statistics block (ST11b).

In this case, the statistical information includes the type of calling subscriber, the telephony control subsystem (TCS) number of the calling subscriber, the calling subscriber line number, the B-channel usage information, the information indicating that the release packet is transmitted to the calling terminal, and the user who used it. Function list, call failure cause information, call failure diagnosis information, etc. are included.

If the subscriber can generate outgoing call, the call setup request packet verification, which is a function of X.25 originating layer 3, is performed.If the call setup request packet is transmitted in an abnormal format, it notifies the error content of the call setup request packet and generates the outgoing call. Stop. Statistical information on the abnormal state of the layer 3 is generated and transmitted to the statistical block of the OMP 7a (ST12a). The statistical information generated at this time includes the type of calling subscriber, the TCS number where the calling subscriber is mounted, the calling subscriber line number, the B-channel usage information, the content indicating that the release packet is sent to the calling terminal, the list of random user functions used, the call. Failure cause information and call failure diagnosis information are included.

In addition, in X.25 Layer 3 of the originating procedure, when the call access packet is an error as a result of verifying Call_Connect packet indicating that the call connection with the called party is successfully made, the originating local call is disconnected. Information is generated and transmitted to the statistics block. After the layer 2 truncation check is requested to the main process, the process ends (ST12b). In this case, the statistical information notified includes the originating subscriber type, the subscriber's TCS number, the originating subscriber line number, the channel information used by the calling subscriber, any user function details used, the called subscriber TCS number, the called subscriber line number, and the like.

ST13 is a step of generating and collecting statistical information on an abnormal state at the calling party when the called party is notified of the called layer 2 setup impossible and the called logical channel allocation information from the called party.

In other words, when notified of the terminating layer 2 set-up is notified, information about an incoming call failure is generated and notified to the statistics block, and the process is terminated after notifying the originating process of the content of the set-up of the terminating layer 2 (ST13a). .

When an incoming logical channel not available content is notified, an incoming logical channel not available notification is sent to the originating process to request the call to be disconnected. In the incoming process, information about an incoming call failure is generated and notified to the statistics block. In the case of the local call, statistical information is generated and notified, including information indicating that the state is before the transition to the data transmission state (ST13b).

Accordingly, the statistical information generated by the calling party includes the calling subscriber type, the TCS number on which the calling subscriber is mounted, the subscriber's line number, the channel used by the calling subscriber, the use of any user function, the TCS number of the called subscriber, and the called subscriber line number. It includes the local call failure cause, the local call failure diagnosis code, and the like.

In addition, the statistical information generated in the called process includes the called party line number, the called party TCS number, the called party type, the channel used by the called party, the use of random user functions, the TCS number of the calling party in the case of the originating call, and the originating call. The call includes the line number of the originating subscriber, the cause of the incoming call failure, the type of the incoming call located at the originating party (whether it is the originating call or the incoming call), the diagnosis code of the cause of the incoming call failure.

Now, a method of collecting statistical information on an abnormal state of layer 2 / layer 3 by the incoming call processing is performed. When the X.25 originating layer 3 processing is normally performed, the incoming call procedure is performed. That is, the receiver accesses the subscriber database and checks the status of the called subscriber. If the called subscriber is in the call stopped state or the do not receive call state, statistical information about the incoming call failure is generated and notified to the statistics block of the OMP (ST21a, 21b). The originating process is notified of the inability to execute the incoming process, and the main process is requested to check the layer 2 truncation and terminate.

In this case, the statistical information generated in the called process includes the called subscriber type, the called subscriber's TCS number, the called subscriber's line number, the channel information set to the called subscriber, any user function usage history, and the calling subscriber's TCS number, In case of the originating origin, it includes the originating subscriber line information, the cause of the incoming call failure, the type of the incoming call by the originating location (whether it is the originating call or the incoming call), the diagnosis code of the originating call failure. The originating process includes the type of originating subscriber, the TCS number of the originating subscriber, the line number of the originating subscriber, the channel information used by the originating subscriber, the history of random user function usage, the called party TCS number, the called party line number, the cause of the local call failure, Statistical information on abnormal status is generated including information such as local call failure diagnosis code.

In addition, if the called subscriber state is a normal state for the incoming call during the call procedure, the called party's layer 2 setting is required. If the called layer 2 setting is impossible, statistical information about an abnormal state is generated.

When the called layer 2 cannot be set, the calling party performs ST13 to generate statistical information about an abnormal state. In addition, the called party generates statistical information on an abnormal state. The statistical information at this time is specified in the operation description of ST13.

In addition, even when an incoming logical channel assignment is impossible, statistical information on an abnormal state is generated, which is described in ST13.

In case of an abnormal state of the X.25 incoming packet layer 3 protocol, that is, when a request for verification of an incoming call packet is received, the called party decomposes an incoming call packet indicating that the incoming call is received by the called terminal. Check whether the call packet is sent in the correct format. Therefore, when an abnormal incoming call packet is transmitted, the incoming call packet error notification is transmitted, thereby rejecting the incoming call generation and requesting physical path release.

As a result of the incoming packet packet verification, when the incoming packet is in an abnormal state, that is, when the incoming call cannot be generated, statistical information about the incoming packet is generated and transmitted to the statistics block (ST24a).

In addition, after the incoming call packet is transmitted to the called terminal, a call accept packet, which is a response from the called terminal, is verified. If an error is found as a result of the verification, the call is performed by a called party process that performs the called layer 2 function. Incoming packet error notification and the main process will require a layer 2 truncation check. Statistical information on the abnormal state is generated and transmitted to the statistical block (ST24b).

In this case, when the transmission procedure and the reception procedure for packet call processing of the electronic switchboard are performed, statistical information about an abnormal state generated in the X.25 protocol layer 2 and layer 3 functions is transmitted to the statistics block of the OMP. This statistical information is processed into information that can be identified by the operator. This allows the operator to quickly identify the cause of the error condition for each layer of the X.25 protocol of the teleswitcher for packet call processing.

As described above, the method for generating layer 2 / layer 3 statistical information on an abnormal state during packet call processing of the electronic switch according to the present invention may be performed for each processing procedure inside the electronic switch for X.25 protocol processing. By investigating and collecting the causes of the abnormal state occurring between layers or within the layer, and processing the information into a form identifiable by the exchange operator, it is possible to promptly recover the abnormal state. In addition, it is possible to generate and collect statistical information on an abnormal state when processing the X.25 protocol of an electronic switch for packet call processing, which can be utilized as basic data when designing a network.

Claims (8)

In an electronic switch that handles packet calls using the X.25 protocol, When the call setup request is made from the subscriber and the calling layer 2 setup completion and call setup request packet are received, the database is accessed to determine the state of the calling subscriber. Generating statistical information relating to the statistical block of an operation and maintenance processor (OMP) in charge of the maintenance of the electronic switchboard; Generating and collecting statistical information when an abnormal state occurs while performing the X.25 calling layer 3 protocol; When the called party performing the incoming processing procedure is notified of the inability to set up the terminating layer 2 or is notified of the inability to assign the terminating logical channel, a third step of generating statistical information about the terminating logical channel assignment is performed. A fourth step of accessing a called party database to check a state of a called party and generating statistical information on an incoming call failure and notifying the statistical block of the OMP if the called party is in a call stopped state or a do not receive state as a result of the test; A fifth step of generating and notifying statistical information about the settable notification if the set of the called party's layer 2 is impossible; A sixth step of generating and notifying statistical information about an incoming logical channel allocation impossibility notification; X.25 Incoming packet When the abnormal state occurs when performing the layer 3 protocol, the packet call of the electronic switching center performs a seventh step of generating statistical information on the abnormal state and transmitting it to the statistical function block. A method of generating layer 2 / layer 3 statistical information on an abnormal state during processing. The method of claim 1, wherein the statistical information generated in the first step, Type of originating subscriber, implemented telephony control subsystem (TCS) number, originating subscriber line number, B-channel usage information, indication of release packet transmission to originating terminal, random user function list used, cause of call failure Method for generating layer 2 / layer 3 statistical information on the abnormal state during packet call processing of the electronic switch, characterized in that it comprises information, call failure diagnostic information. The method of claim 1, wherein the second step, Generating and collecting statistical information on an abnormal state if the call establishment request packet is in an error state as a result of verifying a call_request packet transmitted for a call request from an originating terminal; After verifying the call_connect packet indicating that the call connection with the called party is successfully made to the calling terminal, if the call connection packet is in an error state, generating and collecting statistical information on an abnormal state. A method for generating layer 2 / layer 3 statistical information on an abnormal state during packet call processing of an electronic switch. The method of claim 3, wherein the statistical information generated when the call setup request packet error, Type of originating subscriber, TCS number where the originating subscriber is mounted, originating subscriber line number, B-channel usage information, content indicating that the outgoing packet is sent to originating terminal, random user function list used, call failure information, call failure diagnosis A method for generating layer 2 / layer 3 statistical information on an abnormal state during packet call processing of an electronic switching system, comprising: information. The method of claim 3, wherein the statistical information generated when the call connection packet error, In the case of own country, it is characterized by including the calling party type, subscriber's TCS number, calling party line number, channel information used by calling party, used user function history, called party TCS number, called party line number information. A method of generating layer 2 / layer 3 statistical information on an abnormal state in packet call processing. The method of claim 1, wherein the statistical information generated in the third step, Outgoing subscriber type, TCS number on which outgoing subscriber is mounted, subscriber's line number, channel used by calling subscriber, random user function usage history, TCS number of called subscriber, incoming subscriber line number, cause of local call failure, local call failure diagnostic code A method for generating layer 2 / layer 3 statistical information on an abnormal state during packet call processing of an electronic switching system, comprising: information. The method of claim 1, wherein the statistical information generated in each of the fourth, fifth, sixth, and seventh steps, Type of called subscriber, TCS number of called subscriber, called subscriber line number, channel information set to called subscriber, details of use of random user function, TCS number of calling subscriber in case of originating call, outgoing subscriber line information in case of originating call, An abnormality in packet call processing of an electronic switchboard including the cause of the call failure, the type of the incoming call by the originating side (whether it is the originating call or the incoming call), and the diagnosis code information of the cause of the incoming call failure. How to generate layer2 / layer3 statistical information for a state. The method of claim 1, wherein the seventh step, Generating and collecting statistical information on an abnormal state if the incoming call packet is in an error state as a result of verification of an incoming call packet informing the called terminal of an incoming call; If the call reception packet is an error state as a result of the verification of the call reception packet that is a response from the called terminal receiving the incoming call packet, generating and collecting statistical information on the abnormal state is performed. A method of generating layer 2 / layer 3 statistical information on an abnormal state during call processing.