KR102574576B1 - Call Connecting Method And Terminal of Thereof - Google Patents

Abstract

The following embodiments relate to a call connection method and a terminal performing the call connection method. A proxy payment method according to an embodiment includes receiving an Internet-based call connection request including information about a called terminal; determining whether an entry corresponding to information on a called terminal exists in a previously provided cache table; If the entry exists in the cache table, attempting a call connection directly with the called terminal based on the access address included in the entry; Updating information of an entry when the direct call connection with the called terminal succeeds; If there is no entry in the cache table, attempting a call connection with the called terminal through the SIP server; and generating a new entry and storing it in a cache table when the call connection with the called terminal is successful through the SIP server.

Description

A call connection method of a terminal and a terminal performing the same {Call Connecting Method And Terminal of Thereof}

The following embodiments relate to a call connection method of a terminal and a terminal performing the same.

When making a phone connection to a terminal in a Session Initiation Protocol (SIP) based internet phone service, VoLTE service, etc., information of a called terminal may be cached.

In the current telephone connection service, all calls attempted to connect are transmitted to the server, and the call connection with the called terminal is made through the server, so the server is burdened.

Accordingly, as a method for reducing the load accumulated on the server, Korea Patent Registration No. 10-1115140 discloses a SIP call processing system and method in a soft switch, and provides a technique for processing large-capacity SIP calls.

According to an embodiment, it is intended to provide a call connection method for fast call connection and server load reduction by performing a call connection in a P2P format using a cache for a terminal that has recently connected a call, and a terminal performing the same.

In an embodiment, receiving an Internet-based call connection request including information on the called terminal; determining whether an entry corresponding to information on the called terminal exists in a pre-arranged cache table; attempting a direct call connection with the called terminal based on an access address included in the entry when the entry exists in the cache table; updating information of the entry when the direct call connection with the called terminal succeeds; attempting a call connection with the called terminal through a SIP server when the entry does not exist in the cache table; and generating a new entry and storing it in the cache table when the call connection with the called terminal through the SIP server is successful.

The step of directly attempting a call connection with the called terminal may include transmitting an invitation message to an access address included in the entry; receiving an acknowledgment message from the called terminal; and connecting a call with the called terminal based on the access address.

The updated information may include information about the expiration time of the entry.

Attempting to establish a call connection with the called terminal through the SIP server may include transmitting an invitation message to an address of the SIP server based on information about the called terminal; Receiving an acknowledgment message from the SIP server; and connecting the call to the called terminal based on the second access address included in the acknowledgment message.

The new entry includes information on the called terminal; the second access address included in the acknowledgment message; and information about the expiration time of the new entry.

The information on the called terminal may include a call number of the called terminal, cache information of the called terminal, and an expiration time of an entry of the called terminal.

The step of directly attempting a call connection with the called terminal based on the access address included in the entry may include: checking the expiration time of the called terminal; and if the expiration time has not elapsed, attempting a call connection directly with the called terminal.

Transmitting a protocol for call connection to the called terminal through a session initiation protocol (SIP) server when the call number of the called terminal is not stored in the cache table or the expiration time for the called terminal has elapsed; and updating cache information and expiration time information for the called terminal in the cache table, and performing a call connection with the called terminal.

In the cache table, a storage order of called terminals may be determined based on at least one of a call frequency and a call connection success rate based on the access address.

According to an embodiment of the present invention, a call connection method for quick call connection and server load reduction and a terminal performing the same can be provided by performing a call connection in a P2P format using a cache for a terminal that has recently connected a call.

In particular, when connecting a P2P type call using a cache in a system with many internal calls such as IP-PBX or Centrex, the effect will be high, and the same effect can be expected in the message transmission method using messages such as instant messages. .

1 is a diagram for explaining a SIP network configuration.
2 is a flowchart illustrating a call connection method of a terminal according to an embodiment.
3 is a flowchart of a call connection method for a called terminal having an entry in a cache table according to an embodiment.
4 is a flowchart of another embodiment of a call connection method for a called terminal having an entry in a cache table according to an embodiment.
5 is a flow diagram of an embodiment in which an entry exists in a cache table but an expiration time has elapsed, in one embodiment.
6 is a flow diagram of an embodiment in which there is no entry in the cache table, in one embodiment.
7 is a block diagram illustrating a configuration of a terminal for performing a call connection method according to an embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Various changes may be made to the embodiments described below. The embodiments described below are not intended to be limiting on the embodiments, and should be understood to include all modifications, equivalents or substitutes thereto.

Terms used in the examples are used only to describe specific examples, and are not intended to limit the examples. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the embodiment belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, they should not be interpreted in an ideal or excessively formal meaning. don't

In addition, in the description with reference to the accompanying drawings, the same reference numerals are given to the same components regardless of reference numerals, and overlapping descriptions thereof will be omitted. In describing the embodiment, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the embodiment, the detailed description will be omitted.

1 is a diagram for explaining a SIP network configuration.

The terminals of terminals 1 to 5 according to the embodiment can connect to each other and send and receive messages using the wired and wireless IP network 50 of the SIP server 110. The number of terminals connected to the SIP server 110 is not limited, and can perform a call connection request and a message transmission request via the SIP server 110. For example, when requesting a call connection from terminal 1 to terminal 2, if terminal 1 transmits a protocol to the SIP server 110 as a target, the SIP server 110 sends the protocol to the access address for terminal 2. Call connection between terminal 1 and terminal 2 may be made. The access address may correspond to, for example, an IP address.

According to the embodiment, call connection and message transmission through the SIP server 110 are intended to be performed in a P2P format without going through the SIP server 110 . Since the SIP server 110 forms the wired/wireless IP network 50, that is, the Internet network, each terminal connected to the SIP server 110 may include an access address, and the terminal caches the access address for the receiving terminal. In this case, call connection or message transmission may be performed directly by using the access address at the time of later call connection or message transmission.

As shown, the terminal may store entries for called terminals in the cache table 101 . The information of the called terminal recorded in the entry according to the embodiment may include an ID (call number) of the called terminal, an access address of the called terminal, information about an expiration time of the called terminal, and the like. The expiration time refers to a time from the time of registration in the cache table 101 to a preset period of time (eg, 3600 seconds). For example, the entry of the called terminal may be terminated after the predetermined time. In the embodiment, when performing a direct call connection to a called terminal for which an entry exists in the cache table 101, a direct call connection is performed in a state in which an access address is recorded in the corresponding entry and the expiration time of the corresponding entry has not elapsed. can be done

Hereinafter, a call connection method of a terminal will be described in detail with reference to the accompanying drawings.

2 is a flowchart illustrating a call connection method of a terminal according to an embodiment.

In step 210, the terminal receives an Internet-based call connection request including information on the called terminal.

In an embodiment, the information on the called terminal may include the phone number of the called terminal, and a call connection request for the called terminal using the same Internet network may be received.

In step 220, the terminal determines whether an entry corresponding to information on the called terminal exists in a pre-arranged cache table.

In the embodiment, the cache table contains entries including information on the called terminal, access address for the called terminal, information on the expiration time of the entry of the called terminal, etc. for a terminal having a record of call connection or message transmission/reception with the terminal. can include The cache table may be recorded according to, for example, the frequency or recent record of calls or messages, the success rate of call connection based on the access address, and the like. The form of the cache table may refer to FIG. 1 .

As a result of the determination according to step 220, if an entry including information on the called terminal exists in the cache table in the terminal, in step 230, the terminal directly communicates with the called terminal based on the access address included in the entry. You can try connecting the call.

In an embodiment, if the presence of the called terminal in the entry is confirmed, information about the expiration time recorded for the called terminal may be checked. In an embodiment, a call connection may be directly attempted for a case where the expiration time has not elapsed.

In order to directly perform a call connection, the terminal may transmit an invitation message (eg, INVITE message) to the access address included in the entry, and receive an acknowledgment message (eg, 200 OK message) for the invitation message from the called terminal. message), when receiving an acknowledgment message, a call connection may be performed with the called terminal based on the access address, and a voice call between the two terminals may be connected.

In step 240, when the terminal directly connects the call with the called terminal, it updates the information of the entry.

In an embodiment, information about an expiration time of an entry for a called terminal may be updated based on a time when a call connection is made.

As a result of the determination in step 220, if there is no entry including information about the called terminal in the cache table in the terminal, in step 250, the terminal may attempt to connect the call with the called terminal through the SIP server. there is.

In an embodiment, an invitation message may be transmitted to an address of a SIP server based on information about the called terminal, and the SIP server may transmit the invitation message to the called terminal as a target. After waiting for reception of the acknowledgment message from the SIP server and receiving the acknowledgment message, the call may be connected to the called terminal based on the second access address included in the acknowledgment message. In an embodiment, the second access address may correspond to the access address of the called terminal.

In step 260, if the terminal succeeds in connecting the call with the called terminal through the SIP server, it can create a new entry for the called terminal and store it in the cache table.

In an embodiment, an entry including an expiration time for the entry based on information (call number) on the called terminal, an access address for the called terminal received through an acknowledgment message, and a call connection time may be stored in the cache table. . The stored entry can then be used to directly request a call connection or send a message without using the SIP server.

In one embodiment, when the terminal attempts a direct call connection using the access address of the called terminal in step 230, when a response is not received from the called terminal, the embodiment of steps 250 and 260 Similarly, call connection can be performed using the SIP server. When the call connection is successful using the SIP server, an entry for the called terminal, for example, an access address for the called terminal, an expiration time of the entry, and the like may be updated.

In one embodiment, when the call number of the called terminal is not stored in the cache table or the expiration time for the called terminal has elapsed, an invitation message for call connection is delivered to the called terminal through the SIP server to make a call with the called terminal. Connection is performed, and cache information and expiration time information for the called terminal may be updated in a cache table.

3 is a flowchart of a call connection method for a called terminal having an entry in a cache table according to an embodiment. A flowchart according to an embodiment relates to a case in which an entry exists in the cache table and the expiration time of the entry for the called terminal has not elapsed.

In step 301, terminal 1 (caller) may perform phone dialing with terminal 2 (called party). For example, an operation of inputting a call number for terminal 2 may be included.

In step 302, terminal 1 may check the existence of the called number in the cache table. In an embodiment, it may be confirmed that an entry corresponding to the called number is stored in the cache table.

In step 303, terminal 1 may check expiration time information for a corresponding entry. In an embodiment, the expiration time of the entry stored corresponding to terminal 2 may correspond to a state in which it has not elapsed.

In step 304, if terminal 1 checks the entry of terminal 2 for which the expiration time has not elapsed in the cache table, it can directly transmit an invitation message (INVITE) using the access address of terminal 2 included in the entry.

In step 305, terminal 2 may transmit a 180 Ringing message (protocol) to terminal 1 at the time of ringing in response to the invitation message.

In step 306, terminal 2 may transmit a 200 OK message to terminal 1 at the time when the called party of terminal 2 receives the call connection.

In step 307, terminal 1 may transmit an ACK confirming that the 200 OK message has been received to terminal 2. A call connection session between two terminals may be established through the above process.

In step 308, device 1 may update a cache table entry for device 2. In an embodiment, among the entries for terminal 2 in the cache table, information on the expiration time of the entry may be reconfigured and updated based on the call connection time of the two terminals.

In step 309, terminal 1 may connect a call with terminal 2. In the above method, by using the entry recorded in the cache table of terminal 1, call connection can be performed directly without using the SIP server.

4 is a flowchart of another embodiment of a call connection method for a called terminal having an entry in a cache table according to an embodiment. A flow chart according to an embodiment relates to a case in which an entry exists in the cache table and the expiration time of the entry for the called terminal does not elapse, but the called terminal does not respond to the invitation message.

In step 401, terminal 1 may perform phone dialing with respect to terminal 2. For example, an operation of inputting a call number for terminal 2 may be included.

In step 402, terminal 1 may check the existence of the called number in the cache table. In an embodiment, it may be confirmed that an entry corresponding to the called number is stored in the cache table.

In step 403, terminal 1 may check expiration time information for a corresponding entry. In an embodiment, the expiration time of the entry stored corresponding to terminal 2 may correspond to a state in which it has not elapsed.

In step 404, if terminal 1 checks the entry of terminal 2 for which the expiration time has not elapsed in the cache table, it can directly transmit an invitation message (INVITE) using the access address of terminal 2 included in the entry. Operations up to the corresponding step may be the same as those of FIG. 3 .

Corresponding to step 404, when the response to the invitation message is not received from terminal 2, in step 405, the terminal may retransmit the invitation message to terminal 2 after a certain time after sending the invitation message.

If a response to the invitation message of step 405 is not received for a certain period of time, in step 406, device 1 may determine cache failure and perform a call connection to device 2 through another method.

In step 407, device 1 may transmit an invitation message to the SIP server, and in step 408, the SIP server may transmit the invitation message to device 2 using the access address of device 2. When the call connection request is transmitted, in step 409, terminal 2 can transmit a 180 Ringing message to the SIP server at the time when the terminal rings, and in step 410, the SIP server transmits the 180 Ringing message to terminal 1. can

Terminal 1 may wait to receive a call from terminal 2, and when terminal 2 presses the receive button in response to the call connection request or picks up the handset, terminal 2 may transmit a 200 OK message to the SIP server in step 411. In step 412, the SIP server may transmit the corresponding 200 OK message to terminal 1. Terminal 1 may transmit an ACK message indicating that the 200 OK message was normally received to the SIP server in step 413, and the SIP signal may transmit an ACK message to terminal 2 in step 414. Accordingly, call connection between terminal 1 and terminal 2 may be made.

In step 415, device 1 may update a cache table entry for device 2. For example, since the direct call connection has failed using the pre-stored entry for terminal 2, information on the access address and expiration time of the corresponding entry can be updated. Information about the expiration time may be updated based on a point in time when the call connection between terminal 1 and terminal 2 succeeds. In step 416, terminal 1 may perform a call connection with terminal 2.

5 is a flow diagram of an embodiment in which an entry exists in a cache table but an expiration time has elapsed, in one embodiment. A flowchart according to an embodiment relates to a case in which an entry exists in the cache table and the expiration time of the entry for the called terminal has elapsed.

In step 501, terminal 1 may perform phone dialing with respect to terminal 2. For example, an operation of inputting a call number for terminal 2 may be included.

In step 502, terminal 1 may check the existence of the called number in the cache table. In an embodiment, it may be confirmed that an entry corresponding to the called number is stored in the cache table.

In step 503, terminal 1 may check expiration time information for a corresponding entry. In an embodiment, an expiration time of an entry stored corresponding to terminal 2 may be in a state where it has elapsed. In this case, a call connection request may be transmitted to terminal 2 according to the method described in FIG. 4 .

In step 504, device 1 may transmit an invitation message to the SIP server, and in step 505, the SIP server may transmit the invitation message to device 2 using the access address of device 2. When the call connection request is transmitted, in step 506, terminal 2 can transmit a 180 Ringing message to the SIP server at the time when the terminal rings, and in step 507, the SIP server transmits the corresponding 180 Ringing message to terminal 1. can

Terminal 1 may wait for reception of a call from terminal 2, and in step 508, when terminal 2 presses the receive button in response to the call connection request or picks up the handset, terminal 2 may transmit a 200 OK message to the SIP server. In step 509, the SIP server may transmit the corresponding 200 OK message to terminal 1.

In step 510, terminal 1 may transmit an ACK message indicating that the 200 OK message was normally received to the SIP server, and in step 511, the SIP signal may transmit an ACK message to terminal 2. Accordingly, call connection between terminal 1 and terminal 2 may be made.

In step 512, device 1 may update a cache table entry for device 2. For example, since the expiration time for an entry pre-stored for terminal 2 has elapsed, information on the access address and expiration time of the corresponding entry may be updated. Information about the expiration time may be updated based on a point in time when the call connection between terminal 1 and terminal 2 succeeds. In step 513, terminal 1 may establish a call connection with terminal 2.

6 is a flow diagram of an embodiment in which there is no entry in the cache table, in one embodiment.

In step 601, when terminal 1 performs phone dialing with terminal 2, in step 602, terminal 1 may check existence of the called number in the cache table. In an embodiment, it may be confirmed that no entry corresponding to the called number is stored in the cache table. In this case, a call connection with terminal 2 may be performed using the SIP server.

In step 603, device 1 may transmit an invitation message to the SIP server, and in step 604, the SIP server may transmit an invitation message to device 2 using the access address of device 2. When the call connection request is transmitted to terminal 2, in step 605, terminal 2 can transmit a 180 Ringing message to the SIP server at the time when the terminal rings, and in step 606, the SIP server sends the corresponding 180 Ringing message. It can transmit to terminal 1.

Terminal 1 may wait for reception of a call from terminal 2, and in step 607, in response to terminal 2 pressing the receive button in response to the call connection request or lifting the handset, terminal 2 sends a SIP 200 OK message. It can be transmitted to the server, and in step 608, the SIP server can transmit the corresponding 200 OK message to terminal 1.

In step 609, terminal 1 may transmit an ACK message indicating that the 200 OK message was normally received to the SIP server, and in step 610, the SIP signal may transmit an ACK message to terminal 2. Call connection between terminal 1 and terminal 2 may be made.

In step 611, device 1 may update a cache table entry for device 2. For example, since no pre-stored entry for terminal 2 is recorded, an entry for terminal 2 is created and information on the access address and expiration time is matched with information (call number) on the called terminal to obtain an entry. can be saved Information on the expiration time may be stored based on a point in time when the call connection between terminal 1 and terminal 2 succeeds. In step 612, terminal 1 may establish a call connection with terminal 2.

7 is a block diagram illustrating a configuration of a terminal for performing a call connection method according to an embodiment. The terminal 700 according to the embodiment may correspond to a terminal capable of connecting a call or transmitting a message, such as an Internet phone or a smartphone.

The terminal 700 may include a memory 710 for storing a program and one or more processors 720 for executing the program, and the program according to the embodiment is the call connection of the terminal described with reference to FIGS. method can be recorded.

The processor 720 receives an Internet-based call connection request including information about the called terminal.

In an embodiment, the information on the called terminal may include the phone number of the called terminal, and a call connection request for the called terminal using the same Internet network may be received.

The processor 720 determines whether an entry corresponding to information on the called terminal exists in a pre-arranged cache table.

In the embodiment, the cache table contains entries including information on the called terminal, access address for the called terminal, information on the expiration time of the entry of the called terminal, etc. for a terminal having a record of call connection or message transmission/reception with the terminal. can include The cache table may be recorded according to, for example, the frequency or recent record of calls or messages, the success rate of call connection based on the access address, and the like. The form of the cache table may refer to FIG. 1 .

As a result of the determination, the processor 720 may attempt a direct call connection with the called terminal based on the access address included in the entry when an entry including information about the called terminal exists in the cache table in the terminal.

In an embodiment, if the presence of the called terminal in the entry is confirmed, information about the expiration time recorded for the called terminal may be checked. In an embodiment, a call connection may be directly attempted for a case where the expiration time has not elapsed.

In order to directly perform a call connection, the terminal may transmit an invitation message (eg, INVITE message) to the access address included in the entry, and receive an acknowledgment message (eg, 200 OK message) for the invitation message from the called terminal. message), when receiving an acknowledgment message, a call connection may be performed with the called terminal based on the access address, and a voice call between the two terminals may be connected.

The processor 720 updates the information of the entry when the direct call connection with the called terminal succeeds.

In an embodiment, information about an expiration time of an entry for a called terminal may be updated based on a time when a call connection is made.

Back again, if the processor 720 determines that there is no entry including information about the called terminal in the cache table in the terminal as a result of the determination, it may attempt to connect the call to the called terminal through the SIP server.

In an embodiment, an invitation message may be transmitted to an address of a SIP server based on information about the called terminal, and the SIP server may transmit the invitation message to the called terminal as a target. After waiting for reception of the acknowledgment message from the SIP server and receiving the acknowledgment message, the call may be connected to the called terminal based on the second access address included in the acknowledgment message. In an embodiment, the second access address may correspond to the access address of the called terminal.

When the call connection with the called terminal is successful through the SIP server, the processor 720 may create a new entry for the called terminal and store it in the cache table.

In an embodiment, an entry including an expiration time for the entry based on information (call number) on the called terminal, an access address for the called terminal received through an acknowledgment message, and a call connection time may be stored in the cache table. . The stored entry can then be used to directly request a call connection or send a message without using the SIP server.

In one embodiment, when the terminal 700 directly attempts a call connection using the access address of the called terminal, if a response is not received from the called terminal, as described above, the call connection is performed using the SIP server. can do. When the call connection is successful using the SIP server, an entry for the called terminal, for example, an access address for the called terminal, an expiration time of the entry, and the like may be updated.

In one embodiment, when the call number of the called terminal is not stored in the cache table or the expiration time for the called terminal has elapsed, an invitation message for call connection is delivered to the called terminal through the SIP server to make a call with the called terminal. Connection is performed, and cache information and expiration time information for the called terminal may be updated in a cache table.

The embodiments described above may be implemented as hardware components, software components, and/or a combination of hardware components and software components. For example, the devices, methods and components described in the embodiments may include, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable gate (FPGA). array), programmable logic units (PLUs), microprocessors, or any other device capable of executing and responding to instructions. A processing device may run an operating system (OS) and one or more software applications running on the operating system. A processing device may also access, store, manipulate, process, and generate data in response to execution of software. For convenience of understanding, there are cases in which one processing device is used, but those skilled in the art will understand that the processing device includes a plurality of processing elements and/or a plurality of types of processing elements. It can be seen that it can include. For example, a processing device may include a plurality of processors or a processor and a controller. Other processing configurations are also possible, such as parallel processors.

Software may include a computer program, code, instructions, or a combination of one or more of the foregoing, which configures a processing device to operate as desired or processes independently or collectively. The device can be commanded. Software and/or data may be any tangible machine, component, physical device, virtual equipment, computer storage medium or device, intended to be interpreted by or provide instructions or data to a processing device. , or may be permanently or temporarily embodied in a transmitted signal wave. Software may be distributed on networked computer systems and stored or executed in a distributed manner. Software and data may be stored on one or more computer readable media.

The method according to the embodiment may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program commands recorded on the medium may be specially designed and configured for the embodiment or may be known and usable to those skilled in computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic media such as floptical disks. - includes hardware devices specially configured to store and execute program instructions, such as magneto-optical media, and ROM, RAM, flash memory, and the like. Examples of program instructions include high-level language codes that can be executed by a computer using an interpreter, as well as machine language codes such as those produced by a compiler. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

As described above, although the embodiments have been described with limited drawings, those skilled in the art can make various modifications and variations from the above description. For example, the described techniques may be performed in an order different from the method described, and/or components of the described system, structure, device, circuit, etc. may be combined or combined in a different form than the method described, or other components may be used. Or even if it is replaced or substituted by equivalents, appropriate results can be achieved. Therefore, other implementations, other embodiments, and equivalents of the claims are within the scope of the following claims.

Claims (17)

Receiving an Internet-based call connection request including information about a called terminal;
determining whether an entry corresponding to information on the called terminal exists in a pre-arranged cache table;
If the entry exists in the cache table,
attempting a direct call connection with the called terminal based on the access address included in the entry;
Updating information of the entry when the direct call connection with the called terminal succeeds.
If the entry does not exist in the cache table,
attempting a call connection with the called terminal through a SIP server;
generating a new entry and storing it in the cache table when the call connection with the called terminal is successful through the SIP server;
Transmitting a protocol for call connection to the called terminal through a session initiation protocol (SIP) server when the expiration time for the called terminal has elapsed; and
Updating cache information and expiration time information for the called terminal with respect to the cache table, and performing a call connection with the called terminal.
including,
The cache table is
The storage order of the called terminals is determined based on the call frequency and the call connection success rate based on the access address.
Call connection method of terminal.
According to claim 1,
Attempting a call connection directly with the called terminal
transmitting an invitation message to an access address included in the entry;
receiving an acknowledgment message from the called terminal; and
Connecting a call with the called terminal based on the access address
including,
Call connection method of terminal.
According to claim 1,
The updated information includes information about the expiration time of the entry,
Call connection method of terminal.
According to claim 1,
The step of attempting a call connection through the called terminal and the SIP server
Transmitting an invitation message to the address of the SIP server based on the information about the called terminal;
Receiving an acknowledgment message from the SIP server; and
Connecting a call with the called terminal based on the second access address included in the acknowledgment message
including,
Call connection method of terminal.
According to claim 4,
The new entry is
information about the called terminal;
the second access address included in the acknowledgment message; and
Information about the expiration time of the new entry
including,
Call connection method of terminal.
According to claim 1,
Information on the called terminal,
Including the call number of the called terminal, the cache information of the called terminal, and the expiration time of the entry of the called terminal,
Call connection method of terminal.
According to claim 1,
Attempting a call connection directly with the called terminal based on the access address included in the entry,
checking the elapsed time of the expiration time of the called terminal; and
If the expiration time has not elapsed, attempting a call connection directly with the called terminal.
including,
Call connection method of terminal.
According to claim 1,
transmitting a protocol for call connection to the called terminal through a session initiation protocol (SIP) server when the call number of the called terminal is not stored in the cache table; and
Updating cache information and expiration time information for the called terminal with respect to the cache table, and performing a call connection with the called terminal.
Including more,
Call connection method of terminal.
delete According to claim 1,
Transmitting a written message to the called terminal using an access address included in an entry corresponding to information on the called terminal
Including more,
Call connection method of terminal.
A computer program stored in a computer readable recording medium to be combined with hardware to execute the method of any one of claims 1 to 8 and 10.
In the terminal,
memory for storing programs; and
A processor for executing the program;
the processor,
When an Internet-based call connection request including information on the called terminal is received, it is determined whether an entry corresponding to the information on the called terminal exists in a pre-arranged cache table;
When the entry exists in the cache table, a direct call connection is attempted with the called terminal based on the access address included in the entry, and when the direct call connection with the called terminal succeeds, the information of the entry update the
If the entry does not exist in the cache table, a call connection is attempted through the called terminal and the SIP server, and if the call connection is successful through the called terminal and the SIP server, a new entry is created and stored in the cache table. save,
When the expiration time for the called terminal has elapsed, a protocol for call connection is transmitted to the called terminal through a session initiation protocol (SIP) server, and cache information and expiration time information for the called terminal are stored in the cache table. update, perform call connection with the called terminal,
The cache table is
The storage order of the called terminals is determined based on the call frequency and the call connection success rate based on the access address.
Terminal.
According to claim 12,
the processor,
Transmitting an invitation message to the access address included in the entry, receiving an acknowledgment message from the called terminal, and connecting the call with the called terminal based on the access address.
Terminal.
According to claim 12,
The updated information includes information about the expiration time of the entry,
Terminal.
According to claim 12,
the processor,
Transmitting an invitation message to the address of the SIP server based on the information about the called terminal;
Receiving an acknowledgment message from the SIP server;
Connecting a call with the called terminal based on the second access address included in the acknowledgment message,
Terminal.
According to claim 15,
The new entry
information about the called terminal;
the second access address included in the acknowledgment message; and
Expiration time information of the new entry
including,
Terminal.
According to claim 12,
the processor,
Checking the lapse of the expiration time of the called terminal and, if the expiration time has not elapsed, attempting a direct call connection with the called terminal,
Terminal.

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