KR100884665B1 - VoIP TERMINAL AND METHOD FOR REGISTERING UPDATED IP ADDRESS TO SIP SERVER - Google Patents

Abstract

The present application discloses a VoIP terminal and method for registering an updated IP address with a SIP server. The VoIP terminal is based on the SIP protocol, and terminal information including an initial IP address received from an IP allocation server is registered in the SIP server. The terminal stores the initial IP address, a SIP layer module for controlling a communication session with an external VoIP terminal, a UDP layer module for converting data to be transmitted to the external terminal into a UDP packet form, and the initial IP address. An IP layer module for transmitting the converted data to the external terminal, and an initial IP address stored in the SIP layer module by receiving the transmitted change notification signal and transmitting an IP address update message to the SIP layer module. IP change detection module for updating to the IP address. The VoIP terminal can continuously communicate even if the IP address of the VoIP terminal is changed in the system using the dynamic IP without having to reboot or reset.

VoIP, SIP, Internet Phone

Description

VoIP terminal and method for registering updated IP address to SIP server {VoIP TERMINAL AND METHOD FOR REGISTERING UPDATED IP ADDRESS TO SIP SERVER}

1 is a diagram illustrating a conventional VoIP terminal to communication system in a system using a static IP.

2 is a diagram illustrating a conventional inter-VOIP terminal communication system in a system using dynamic IP.

3 is a diagram illustrating a VoIP terminal-to-telephone communication system 300 according to an embodiment in a system using dynamic IP.

4 illustrates an operation between an IP layer module, an IP change detection module, and a SIP layer module when an IP address of a user terminal is changed, according to an exemplary embodiment.

5 is a flowchart illustrating a method for updating and registering an IP address of a VoIP terminal based on a SIP protocol with a SIP server, according to an embodiment.

The present invention relates to a technology for registering an IP (internet protocol) address of a SIP protocol-based VoIP terminal with a SIP server. In particular, the present invention relates to registering an updated IP address with a SIP server when an initial IP address of a VoIP terminal is updated during use. VOIP terminal and method.

Voice over Internet Protocol (VoIP) is a communication service technology that uses a packet network for data communication, which has been used in the past, for an Internet phone, and converts voice data into Internet protocol data packets to enable a call as in a general telephone network. VoIP technology transmits and receives voice data input from VoIP terminals (PCs, IP phones, wired / wireless phones, etc.) through the Internet network, so it is much cheaper, more scalable, and allows multiple people to talk at the same time. .

In this VoIP technology, H.323 has been used as a communication protocol between VoIP terminals in the past, but H.323 has a disadvantage in that stability is poor, security is weak, and the protocol structure is complicated. Therefore, in recent years, the Session Initiation Protocol (SIP), which is more stable and secure than H.323, and has a simple protocol structure and is easily implemented in low-end terminals, is widely used as a VoIP communication protocol.

1 is a diagram illustrating a conventional VoIP terminal to communication system 100 in a system using a static IP. Referring to FIG. 1, the user terminal 110 transmits and receives a data packet with an external terminal 140 through an Internet service provider (ISP) server 120 and a SIP proxy server 131. In addition, the SIP protocol used for the user terminal 110 is composed of four layers, and the user terminal 110 includes modules 111 to 114 that perform functions of the SIP protocol layer. In FIG. 1, reference numbers of modules corresponding to the layers of the SIP protocol are indicated, that is, the SIP layer module 111 is the highest layer, and the data link layer module 114 is the highest. Lower layer module. Therefore, when the user terminal 110 intends to transmit data to the outside, the data packet is transmitted in the order of the lower layer module from the upper layer module, and on the contrary, when the user terminal 110 receives the data packet from the outside Next, a reception process is performed from the lower layer module to the upper layer module.

The SIP layer module 111 controls the creation, modification and termination of the communication session between the user terminal 110 and the external terminal 140 and stores IP address information of the user terminal 110. If the user terminal 110 is assigned a fixed IP address from the ISP server 120 at the initial setting, the IP address is stored in the SIP layer module 111, and the SIP layer module 111 includes the allocated IP address information. The registration information is transmitted to the SIP server 130 so that the information of the user terminal 110 is registered in the SIP registration server 132. The ISP server 120 may be a server of an operator providing an Internet service, and the SIP server 130 may be a server of an operator providing a VoIP communication service, and a provider of the Internet service and a provider of VoIP communication may be the same. When the information of the user terminal 110 is registered in the SIP registration server 132, the SIP proxy server 131 determines the location of the user terminal 110 based on the registered information to establish a communication session with the external terminal 140. To be created.

The UDP layer module 112 converts data to be transmitted to the external terminal 140 in the form of a user datagram protocol (UDP) packet through a communication session generated by the SIP layer module 111. In addition, the IP layer module 113 transmits the UDP data packet converted by the UDP layer module 112 to the IP address of the external terminal 140, and the user terminal 110 allocated from the ISP server 120 at the initial setting. ) Is stored in the SIP layer module 111 and the IP layer module 113. The IP address information of the user terminal 110 allocated from the ISP server 120 at the time of initial setting is stored in the SIP layer module 111 and the IP layer module 113. The data link layer module 114 forwards the UDP data packet designated to be transmitted from the IP layer module 113 to the IP address of the external terminal 140 to the communication modem 115 to communicate with the ISP server 120 at the communication modem 115. The data packet is transmitted to the external terminal 140 via the ISP server 120 and the SIP proxy server 131.

The above description has been described for the case in which data is transmitted from the user terminal 110 to the external terminal 140, but in the case of transmitting data from the external terminal 140 to the user terminal 110 in the reverse order. Data transfer takes place. That is, when data from the external terminal 140 is received through the communication modem 115 of the user terminal 110, the data link layer module 114, the IP layer module 113, UDP layer module 112 and Data is delivered in the order of the SIP layer module 111 so that the user can hear the call voice.

In addition, the above description is a case where the user terminal 110 is assigned a fixed IP address does not change the IP address. Recently, however, due to the exponential increase in the number of terminals such as computers, Internet service providers have been using IP systems to provide IP to user terminals. Increasingly, addresses are allocated dynamically.

2 is a diagram illustrating a conventional VoIP terminal to communication system 200 in a system using a dynamic IP. Referring to FIG. 2, in the system 100 of FIG. 1, an IP allocation server 121 is added to the ISP server 120, and an access client 116 is added to the user terminal 110.

When the access client 116 receives the IP address of the user terminal 110 from the IP allocation server 121 at the initial setting, the assigned IP address is stored in the SIP layer module 111 and the IP layer module 113. In addition, the SIP layer module 111 transmits registration information including the assigned IP address to the SIP server 130 and registers terminal information of the user terminal 110 in the registration server 132.

However, the IP address assigned in this way is often a fixed period of use, and when the period of use expires, even if the user terminal 110 is connected to the network, the IP allocation server 120 is the user terminal 110 Will be assigned a new IP address. In addition, there may be a case in which it is necessary to reallocate an IP address to the user terminal 110 in use due to the circumstances of the Internet service provider such as maintenance or breakdown. When a new IP address is assigned while using the user terminal 110 as described above, the new IP address is stored only in the IP layer module 113 and is not stored in the SIP layer module 111. Therefore, since the SIP layer module 111 detects a change in the IP address and does not transmit new registration information including the new IP address to the SIP server 130, the SIP proxy server 131 of the user terminal 110. It does not know the location and eventually cannot continue the communication session with the external terminal 140. That is, while the user terminal 110 communicates with the external terminal 140, the IP address is changed so that communication cannot continue, and the user reboots the terminal 110 or proceeds to initial setting again to perform the SIP layer module 111. The inconvenience of having to save the IP address again. Therefore, there is a need for a VoIP terminal and method capable of continuously communicating in a system using dynamic IP.

Accordingly, an object of the present invention is to enable continuous communication without rebooting or resetting even when the IP address of the VoIP terminal is changed in a system using dynamic IP.

According to an embodiment, there is provided a VoIP terminal based on the SIP protocol and having terminal information including an initial IP address received from an IP allocation server registered in a SIP server, wherein the SIP protocol based on the terminal includes: An IP address is stored, a SIP layer module for controlling a communication session with an external VoIP terminal, a UDP layer module for converting data to be transmitted to the external terminal in the form of a UDP packet, the initial IP address is stored, and the converted data IP layer module for transmitting to the external terminal-When a new IP address is allocated from the IP allocation server, the initial IP address stored in the IP layer module is updated with the new IP address, and the IP layer module sends a change notification signal. And-receiving the transmitted change notification signal and transmitting an IP address update message to the SIP layer module. IP change detection module for updating the initial IP address stored in the SIP layer module to the new IP address.

According to an embodiment, when the initial IP address stored in the SIP stack is updated with the new IP address, a registration message including the new IP address is transmitted to the SIP server, and the SIP server receives the registration message. The terminal information is updated according to the received registration message.

According to another embodiment, there is provided a method for renewing and registering an IP address of a SIP protocol-based VoIP terminal in a SIP server, wherein the method sets an initial IP address received from an IP allocation server at the initial configuration to a SIP layer in the SIP protocol. Storing in the module and the IP layer module, registering terminal information including the initial IP address in the SIP server, and when the new IP address is allocated from the IP allocation server, the initial IP stored in the IP layer module. Updating the new IP address and transmitting a change notification signal to an IP change detection module, the IP change detection module receiving the change notification signal, and the IP change detection module sending an IP address update message; Transmitting to the SIP layer module, and the SIP layer module receiving the IP address update message Updating the stored initial IP address with the new IP address.

According to one embodiment, the method, after updating the initial IP address stored in the SIP layer module to the new IP address, the SIP layer module sends a registration message including the new IP address to the SIP server Transmitting to the SIP server, and receiving the registration message and updating and registering the terminal information according to the received registration message.

Hereinafter, embodiments according to the present invention will be described in detail. However, the present invention should not be construed as limited to the following examples.

FIG. 3 is a diagram illustrating an inter-VOIP terminal communication system 300 according to an embodiment in a system using dynamic IP.

Referring to FIG. 3, the user terminal 310 transmits and receives a data packet with an external terminal 340 through an ISP server 320 and a SIP proxy server 331 of an Internet service provider. As the user terminal 310 and the external terminal 340, various devices such as a personal computer (PC), an Internet phone, an IP phone, a mobile phone, a notebook computer, a PDA, and an Internet-accessible TV may be used.

Like the conventional user terminal 210 of FIG. 2, the user terminal 310 also includes a SIP layer module 311, a UDP layer module 312, an IP layer module 313, a data link layer module 314, and a communication modem ( 315) and an access client 316, and when transmitting data from the user terminal 310 to the outside as described above with reference to FIGS. 1 and 2, the SIP layer module 311, the UDP layer module 312, The transmission process is performed in the order of the IP layer module 313, the data link layer module 314, and the communication modem 315. In the case of receiving data, the reception process is performed in reverse. In addition, the access client 316 performs the same function as the access client 216 of FIG. Other functions or operations are almost similar to those mentioned in the prior art, so detailed description thereof will be omitted. However, unlike the conventional user terminal 210 illustrated in FIG. 2, the user terminal 310 of the present invention further includes an IP change detection module 317. The function and operation of the IP change detection module 317 will be described in detail below.

In the initial setup of the user terminal 310, if the access client 316 is assigned an initial IP address from the IP allocation server 321 in the ISP server 320, the assigned initial IP address is the IP layer module 313 And are stored in the SIP layer module 311, respectively. In this case, the IP allocation server 321 for allocating the dynamic IP may be a Point to Point Protocol Over Ether (PPPoE) server or a Dynamic Host Configuration Protocol (DHCP) server. When the IP allocation server 321 is a PPPoE server, the access client 316 is a PPP client. When the IP allocation server 321 is a DHCP server, the access client 316 becomes a DHCP client.

When the initial IP address is stored in the SIP layer module 311, the SIP layer module 311 transmits registration information including the initial IP address to the SIP server 330, and the registration information is registered in the registration server 332. . Subsequently, when the user terminal 310 wants to communicate with the external terminal 340, the SIP proxy server 331 detects the location of the user terminal 310 through the registration information and connects with the external terminal 340 to communicate. Allows you to create a session.

When the user terminal 310 communicates with the external terminal 340, for example, when the period of use of the initial IP address expires or an event such as a failure or inspection of the server of the ISP 320 occurs, the IP allocation server 321 may be connected to the user. A new IP address is assigned to the terminal 310. When the access client 316 is assigned a new IP address from the IP allocation server 321, the initial IP address is deleted and the assigned new IP address is stored in the IP layer module 313, but the SIP layer module 311 is stored in the IP layer module 311. The new IP address is not saved. The IP layer module 313 then sends a change notification signal to the IP change detection module 317 indicating that the IP address stored therein has been changed. Upon receiving the change notification signal from the IP layer module 313, the IP change detection module 317 transmits a queue including an IP address update message to the SIP layer module 311 and sends the IP address update message. The received SIP layer module 311 deletes the initial IP address stored therein and stores the new IP address. The IP address update message may not be included in the queue but may be transmitted from the IP change detection module 317 to the SIP layer module 311 alone. Hereinafter, the operation of the IP layer module 313, the IP change detection module 317, and the SIP layer module 311 will be described in more detail with reference to FIG. 4.

4 is a diagram illustrating an operation between the IP layer module 313, the IP change detection module 317, and the SIP layer module 311 when the IP address of the user terminal 310 is changed, according to an exemplary embodiment.

Referring to FIG. 4, the IP change detection module 317 transmits a notification registration signal R to the IP layer module 313 in advance, so that the IP layer module when the IP address stored in the IP layer module 313 is changed. The notification may be registered so that the 313 transmits the change notification signal N to the IP change detection module 317. Thereafter, when the initial IP address stored in the IP layer module 313 at the initial setting of the user terminal 310 is changed to the new IP address, the IP layer module 313 changes the notification signal N for notifying the IP address change. To the IP variation detection module 317. Upon receiving the change notification signal N, the IP change detection module 317 includes a queue including an IP address update message D for changing an initial IP address stored in the SIP layer module 311 to a new IP address. (Q) is transmitted to the SIP layer module 311. Upon receipt of the queue Q, the SIP layer module 311 deletes the previously stored initial IP address according to the IP address update message D and stores the new IP address. In this case, the IP address update message D may not be included in the queue Q but may be transmitted from the IP change detection module 317 to the SIP layer module 311 alone.

Referring back to FIG. 3, when the SIP layer module 311 receives the IP address update message and a new IP address is stored therein, the SIP layer module 311 sends new registration information including the new IP address to the SIP server. Send to 330. When the new registration information is registered in the registration server 332, since the SIP proxy server 331 may relocate the user terminal 310 through the registration information, even if the IP address of the user terminal 310 is changed. The user terminal 310 can continuously maintain a communication session with the external terminal 340.

5 is a flowchart illustrating a method 500 for updating and registering an IP address of a VoIP terminal based on a SIP protocol with a SIP server according to an embodiment of the present invention.

3 to 5, the initial IP address received from the IP allocation server 321 is initially stored in the SIP layer module 311 and the IP layer module 313 (S510). As described above, the IP allocation server 321 may be either a DHCP server or a PPPoE server.

Then, the terminal information including the initial IP address is registered in the SIP server 330 (S520). When the new IP address is allocated from the IP allocation server 321 due to the expiration of the initial use period of the initial IP address, the IP layer module 313 updates the initial IP address stored therein with the new IP address and changes the change notification signal to IP change. In step S530, the sensing module 317 transmits to the sensing module 317 (see FIG. 4). When the IP change detection module 317 receives the change notification signal (S540), the IP change detection module 317 transmits an IP address update message to the SIP layer module 311 (S550). In this case, the IP address update message may be included in a queue including a series of messages and transmitted to the SIP layer module 311. Next, when the SIP layer module 311 receives the IP address update message, the SIP layer module 311 updates the initial IP address stored in the SIP layer module 311 with the new IP address (S560). When the SIP layer module 311 transmits a registration message including the new IP address to the SIP server 330 (S570), the SIP server 330 receives the registration message and transmits terminal information to the registration server 332. Update (S580). By updating and registering the terminal information according to the IP address change, the communication with the external terminal 340 can be continuously maintained even if the IP address of the user terminal 310 is changed in the system using the floating IP.

Although not shown in FIG. 5, the method 500 of FIG. 5 may add a step in which the IP change detection module registers a notification to the IP layer module.

For example, in the method 500 of FIG. 5, before the step S510 of transmitting the change notification signal N to the IP change detection module 317, the IP change detection module 317 is the IP layer module 313. The notification registration is transmitted by transmitting a notification registration signal R), and when the IP address stored in the IP layer module 313 is changed by registering the notification, the IP layer module 313 moves to the IP change module 317. You can send a change notification signal.

The method 500 described above may be embodied as a computer readable medium containing program instructions for performing the method 500. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical recording media such as CD-ROMs, DVDs, magnetic-optical media such as floppy disks, and ROM, RAM, flash memory, and the like. Hardware devices specifically configured to store and execute the same program instructions are included. The medium may be a transmission medium such as an optical or metal wire, a waveguide, or the like including a carrier wave for transmitting a signal specifying a program command, a data structure, or the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.

A general purpose computer device may also be employed to perform the method 500 described above. The computer device includes one or more processors coupled with a main memory device including random access memory (RAM) and read only memory (ROM). A processor is also called a central processing unit (CPU). As is well known in the art, ROMs serve to transfer data and instructions to the CPU unidirectionally, and RAM is typically used to transfer data and instructions bidirectionally. RAM and ROM may include any suitable form of computer readable media. Mass storage is bidirectionally coupled to the processor to provide additional data storage capability and may be any of the computer readable recording media described above. Mass storage devices are used to store programs, data, and the like, and are usually secondary storage devices such as hard disks that are slower than main memory. Certain mass storage devices such as CD ROMs may also be used. The processor is connected to one or more input / output interfaces, such as video monitors, trackballs, mice, keyboards, microphones, touchscreen displays, card readers, magnetic or paper tape readers, voice or handwriting readers, joysticks, or other known computer input / output devices. . Finally, the processor may be connected to a wired or wireless communication network through a network interface. Through this network connection, the procedure of the method described above can be performed. The apparatus and tools described above are well known to those skilled in the computer hardware and software arts. The hardware device may be configured to operate as one or more software modules to perform the method 500.

The foregoing has described only some embodiments of the invention. Those skilled in the art to which the present invention pertains will readily appreciate that various applications may be practiced without departing from the spirit and scope described in the detailed description, drawings, and claims of the present invention. Accordingly, the detailed description of the invention should be considered as illustrative and not restrictive.

As described above, the VoIP terminal and the method for registering the renewed IP address in the SIP server can continue to communicate even if the IP address of the VoIP terminal is changed in the system using the dynamic IP without rebooting or resetting. .

Claims (9)

A VoIP terminal communicating using the SIP protocol, A SIP layer module which stores an initial IP address received from an IP allocation server and controls a communication session with an external VoIP terminal; A UDP layer module for converting data to be transmitted to the external VoIP terminal into a UDP packet form; An IP layer module for storing the initial IP address and transmitting the converted data to the external VoIP terminal; And IP fluctuation detection module, When the IP layer module receives a new IP address from the IP allocation server during communication, the IP layer module updates the initial IP address stored therein with the new IP address and transmits a change notification signal to the IP change detection module. The IP change detection module transmits a notification registration signal to the IP layer module, and registers a notification to transmit the change notification signal to the IP change detection module when the IP address stored in the IP layer module is changed. When the change notification signal is received from the layer module, an IP address update message is transmitted to the SIP layer module. The SIP layer module receives the IP address update message, updates the stored initial IP address with the new IP address, and transmits a registration message including the new IP address to a SIP server.  VoIP terminal. delete delete The VoIP terminal of claim 1, wherein the IP allocation server is one of a DHCP server and a PPPoE server. A method for renewing and registering an IP address of a VoIP terminal in a SIP server, wherein the SIP protocol includes an IP change detection module that communicates using a SIP protocol and detects an IP address change. Storing an initial IP address received from an IP allocation server at an initial setting in a SIP layer module and an IP layer module in the SIP protocol; Transmitting and registering terminal information including the initial IP address to the SIP server; Registering, by the IP change detection module, a notification registration signal to an IP layer module to transmit a change notification signal to the IP change detection module when an IP address stored in the IP layer module is changed; When the new IP address is allocated from the IP allocation server, updating, by the IP layer module, the initial IP address stored therein to the new IP address and transmitting a change notification signal to the IP change detection module; Receiving, by the IP change detection module, the change notification signal; Sending, by the IP change detection module, an IP address update message to the SIP layer module; And Receiving, by the SIP layer module, the IP address update message and updating the initial IP address stored in the SIP layer module with the new IP address; How to include. The method of claim 5, wherein after updating the stored initial IP address with the new IP address in the SIP layer module, Sending, by the SIP layer module, a registration message including the new IP address to the SIP server; And The SIP server receiving the registration message and updating the terminal information How to include more. delete 6. The method of claim 5, wherein the IP assignment server is one of a DHCP server or a PPPoE server. A computer-readable recording medium storing computer-executable instructions for performing the method of any one of claims 5, 6 or 8.

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