KR100413524B1 - Management method of SIP-T call control process and apparatus thereof - Google Patents

Abstract

A method and apparatus for managing a SIP-T call control process are disclosed. SIP-T call control process management method according to the present invention, by monitoring the signal arriving at the SIP-T management process to determine the type of signal generated, and according to the generated signal, outgoing call child process or incoming call Creating a child process or delivering a message to the child process. By creating outgoing and incoming child processes every time a call is generated, it performs call control and manages related information, enabling effective management of SIP-T call processing processes and fast and reliable SIP-T signal processing.

Description

Management method of SIP-T call control process and apparatus

The present invention relates to signal transmission, and more particularly, to a method and apparatus for managing a SIP-T call control process used in an integrated network of a PSTN network and a packet network.

In the conventional SIP-T call control process, all call connection requests are managed by one process to maintain state information on all call connections, which is very complicated and error-prone, and simultaneously requests multiple call requests. This process only slows down the processing speed.

An object of the present invention is to create and manage a plurality of child processes that handle call connection requests in a SIP-T call control process, thereby effectively managing the SIP-T call processing process and enabling fast processing. To provide.

Another object of the present invention is to provide a computer-readable recording medium having recorded thereon a program for executing the SIP-T call control process management method on a computer.

1 is a conceptual diagram illustrating an integrated network structure of a PSTN network and a packet network.

2 is a block diagram of a SIP-T call control process management apparatus according to the present invention.

3A to 3F are flowcharts illustrating each step of the SIP-T call control process management method according to the present invention.

According to an aspect of the present invention, there is provided a method for managing a SIP-T call control process, the method comprising: determining a type of a signal generated by monitoring a signal arriving at a SIP-T management process; And generating, according to the generated signal, an outgoing call child process or an incoming call child process or delivering a message to the child process.

According to an aspect of the present invention, there is provided a SIP-T call control process management apparatus, including: a signal determination unit configured to monitor an incoming signal and determine a type of a generated signal; And a signal processing unit for generating an outgoing call child process or an incoming call child process or delivering a message to the child process according to the generated signal.

Hereinafter, a method and apparatus for managing a SIP-T call control process according to the present invention will be described in detail with reference to the accompanying drawings.

In order to develop a public switched telephone network (PSTN) into an IP-based next generation network, an integrated network of a PSTN network and a packet network has been introduced.

1 is a conceptual diagram illustrating an integrated network structure of such a PSTN network and a packet network. Referring to FIG. 1, the PSTN network 100 and the packet network 110 are connected through a media gateway (MG) 120 and a media gateway controller MGC 130.

The PSTN network 100 provides a service for a general telephone over a public circuit switched telephone network. The packet network (110) accumulates the information sent from the calling party, divides it into packets of a certain size, attaches a destination address, and transmits and exchanges them in units. The media gateway 120 converts the PSTN voice medium into a packet form used in the packet network.

The MGC 130 receives the PSTN signal 1 to control the media gateway 120 and perform a call connection. A general purpose computer is generally used. The SIP-T call control process management method according to the present invention is performed in MGC.

The PSTN signaling message 1 transmitted to the MGC 130 is converted into a Session Initiation Protocol (SIP) message (2) used in the packet network 110, sent to another MGC 131, and then converted into a PSTN signaling message (1). The Session Initiation Protocol for Telephones (SIP-T) protocol is used to connect the calls between the corresponding PSTN phones.

SIP messages include information about INVITE initiating the call, ACK message confirming the call connection, STATUS message indicating the progress of the call, CANCEL message canceling the call connection, BYE message terminating the call, and information without changing the state of the call. There is an INFO message to convey.

When the call connection is made from one PSTN network 100 to another PSTN network 101, the signal information includes the PSTN network 100, the MGC 130, the packet network 110, the MGC 131, and the PSTN network 101. The voice media is delivered in the order of the PSTN network 100, the media gateway 120, the packet network 110, the media gateway 121, and the PSTN network 101.

2 is a block diagram of a SIP-T call control process management apparatus according to the present invention. Referring to FIG. 2, the SIP-T call control process management apparatus 200 according to a preferred embodiment includes a signal determiner 210 and a signal processor 220.

For convenience of description, the PSTN network 100, the packet network 110, the counterpart MGC 131, the hash table 300, the process management table 310, the originating call child process 400 and the incoming call child are shown in FIG. Process 500 is shown together. The SIP-T call control process management apparatus 200, the hash table 300, the process management table 310, the outgoing call child process 400 and the incoming call child process 500 together form the MGC 130.

The signal determiner 210 monitors the signal arriving at the SIP-T management apparatus 200 and determines the type of the generated signal. Signals generated include an outgoing call request signal, an external MGC message reception signal, an external MGC message transmission signal, and a call termination signal.

The signal processor 220 generates an outgoing call child process 400 or an incoming call child process 500 according to the generated signal, or delivers a message to the child process. Preferably, the signal processor 220 includes an outgoing call request processor 222, a message reception processor 224, a message transmitter 228, and a call termination processor 226.

If the generated signal is an outgoing call request signal, the outgoing call request processing unit 222 generates a SIP-T outgoing call child process 400 and registers information in the hash table 300 and the process management table 310.

Processes are programs that run independently, and each process communicates asynchronously with each other through signals. Preferably each process is implemented using a Specification and Description Language (SDL) language recommended by ITU-T for communication system design.

The outgoing call child process 400 is a process for handling SIP outgoing calls and is generated whenever a call occurs and is destroyed when the call ends.

The process management table 310 is a storage place for holding information on child processes that perform SIP-T call control. It has a number of records and has attributes in use, a global call identifier, a child process identifier, and an MGC identifier.

The hash table 300 is a place for storing a record set of the process management table 310 having the same key value as the global call identifier as a key value. Hash table 300 allows for quick retrieval of information stored in process management table 310 using a global call identifier.

The message reception processing unit 224 decrypts the SIP message 2 when the generated signal is an external MGC message reception signal, and generates an incoming call child process 500 when the decrypted message is the first INVITE message to generate a hash table ( 300) and the process management table 310, and if it is not the first INVITE message, the received call child process 500 is searched in the hash table 300 and the process management table 310 to deliver the message. .

The incoming call child process 500 is a process for handling SIP incoming calls and is generated each time a call occurs and disappears when the call ends.

When the generated signal is an external MGC message transmission signal, the message transmitter 228 finds the other side MGC 131 and sends an encrypted packet.

If the generated signal is the call termination signal, the call termination processor 226 deletes the management information for the call from the corresponding record of the hash table 300 and the process management table 310 and makes the record number available. In this case, the corresponding child processes 400 and 500 are terminated.

3A to 3F are flowcharts illustrating each step of the SIP-T call control process management method according to the present invention. Hereinafter, a method for managing SIP-T call control process according to the present invention will be described in detail with reference to FIGS. 3A to 3F.

The SIP-T management process monitors the arriving signal (S300), and determines the type of signal generated when the signal is generated (S301).

If the generated signal is an outgoing call request (S302), the process management table 310 is searched to obtain a record number to store outgoing call information (S310). If all records of the process management table 310 are in use and no records are available, a call connection failure is notified. After obtaining the record number, the originating call child process 400 is generated (S312), and a global call identifier having a form of "IP number of record number @ MGC" is generated (S314). A hash function value is obtained using the global call identifier as a key value (S316), and the record number of the process management table obtained in step S310 is stored in a record of the hash table 300 using the hash function value (S318). This enables quick information retrieval of the process management table 310. After storing the generated identifier and the MGC identifier of the child process in the record of the process management table 310, it indicates that the corresponding record is in use (S320). Since the originating call child process 400 is generated whenever there is a call request, the SIP-T call processing process can be effectively managed and fast and reliable SIP-T signal processing is possible.

If the generated signal is received an external MGC message (S303), the SIP message is decrypted (S304). If the decrypted message is the first INVITE message (S305), the process management table 310 is searched to obtain a record number for storing the incoming call information (S330), and the incoming call child process 500 is generated (S332). After obtaining the global call identifier from the decrypted SIP message (S334), the record number of the process management table 310 is stored in the record of the hash table 300 (S336), and the child process in the record of the process management table 310 The identifier and the MGC identifier are stored, and indicate that the record is in use (S338). Whenever there is a call request, the incoming call child process 500 is generated for the first INVITE message reception request, thereby effectively managing the SIP-T call processing process and enabling fast and reliable SIP-T signal processing.

If the message decrypted in step S304 is not the first INVITE message (S305), the record number of the process management table 310 is used as the hash value of the global call identifier in order to find and forward the message that has already been created. Obtain a set (S340), find a record number that matches the global call identifier among the record number set (S342), obtain a child process identifier attribute value based on the found record number, and deliver the SIP message to the corresponding child process (S344). .

If the generated signal is an external MGC message transmission signal (S306), the SIP message is encrypted (S350), the opponent MGC is searched in the process management table 310 (S352), and the SIP message encrypted by the other MGC 131. The signal is transmitted (S354).

If the generated signal is a call termination signal (S307), the management information for the call is deleted from the corresponding record of the hash table 300 and the process management table 310 (S360), and the record number is available. In operation S362, the execution of the corresponding child processes 400 and 500 is terminated (S364).

After performing the corresponding steps for each case, the step from S300 is performed for the next signal.

The present invention can be embodied as code that can be read by a computer (including all devices having an information processing function) in a computer-readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable recording devices include ROM, RAM, CD-ROM, magnetic tape, floppy disks, optical data storage devices, and the like.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

According to the method and apparatus for managing a SIP-T call control process according to the present invention, each time a call is generated, an originating and receiving child process is generated to perform call control and manage related information, thereby effectively managing the SIP-T call processing process. Fast and reliable SIP-T signal processing is possible. It also reduces the time needed to evolve PSTN telephony services over packet networks, and reduces the time and cost required to improve existing telecommunications services.

Claims (14)

(a) monitoring a signal arriving at the SIP-T management process to determine the type of signal generated; And (b) generating, according to the generated signal, an outgoing call child process or an incoming call child process, or delivering a message to the child process. According to claim 1, wherein step (b), (b1) if the generated signal is an outgoing call request signal, generating a SIP-T outgoing call child process and registering information in a hash table and a process management table; How to manage. The method of claim 2, wherein step (b1), (b11) retrieving a process management table to obtain a record number for storing outgoing call information; (b12) creating an outgoing call child process; (b13) generating a global call identifier; (b14) obtaining a hash function value using the global call identifier as a key value; (b15) storing the record number of the process table in a hash table record; And (b16) storing the identifier of the child process and the MGC identifier in a record of the process table, and indicating that the record is in use. According to claim 1, wherein step (b), (b2) decoding the SIP message when the generated signal is an external MGC message reception signal, and generating and registering an incoming call child process in a hash table and a process management table when the decrypted message is a first INVITE message; And (b3) if the generated signal is an external MGC message reception signal, decrypts a SIP message, and if the decrypted message is not the first INVITE message, retrieves an already created incoming call child process from a hash table and a process management table. SIP-T call control process management method comprising the step of forwarding a message. The method of claim 4, wherein step (b2), (b21) obtaining a record number for storing the incoming call information by searching the process management table; (b22) creating an incoming call child process; (b23) obtaining a global call identifier from the decrypted SIP message; (b24) storing the record number of the process table in a hash table record; And (b25) storing the identifier of the child process and the MGC identifier in a record of the process table, and indicating that the record is in use. The method of claim 4, wherein step (b3), (b31) obtaining a record number set of the process management table using the global call identifier as a hash value; (b32) finding a record number in the record number set that matches the global call identifier; And (b33) obtaining a child process identifier attribute value based on the record number and delivering the SIP message to a corresponding child process. The method of claim 1, and (c) if the generated signal is an external MGC message transmission signal, searching for the other party's MGC and sending an encrypted packet. The method of claim 1, (d) If the generated signal is a call termination signal, deletes management information about the call from the corresponding record of the hash table and the process management table, marks the record number as available, and executes the corresponding child processes. SIP-T call control process management method further comprising the step of terminating. A signal determination unit which monitors the arriving signal and determines the type of the generated signal; And And a signal processor configured to generate an outgoing call child process or an incoming call child process according to the generated signal, or to transmit a message to the child process. The method of claim 9, wherein the signal processing unit, If the generated signal is an outgoing call request signal, the SIP-T call control process, characterized in that it comprises an outgoing call request processing unit for generating a SIP-T outgoing call child process and registers information in the hash table and the process management table Management device. The method of claim 9, wherein the signal processing unit, When the generated signal is an external MGC message reception signal, the SIP message is decrypted. When the decrypted message is the first INVITE message, an incoming call child process is generated and registered in the hash table and the process management table, and the first INVITE message is generated. If not, SIP-T call control process management apparatus comprising a message receiving processing unit for retrieving the incoming call child process already generated in the hash table and the process management table to deliver the message. The method of claim 9, wherein the signal processing unit, And a message transmitter for finding an opponent MGC and sending an encrypted packet when the generated signal is an external MGC message transmission signal. The method of claim 9, wherein the signal processing unit, If the generated signal is a call termination signal, the management information for the call is deleted from the corresponding record of the hash table and the process management table, the corresponding record number is marked as available, and the execution of the corresponding child processes is terminated. SIP-T call control process management apparatus comprising a call termination processing unit. (a) monitoring a signal arriving at the SIP-T management process to determine the type of signal generated; And (b) a computer-readable recording medium having recorded thereon a program for causing a computer to execute the step of generating an outgoing call child process or an incoming call child process or delivering a message to the child process according to the generated signal.