KR100927936B1 - Interlock between two different networks - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a linkage device between two different networks.

2. The technical problem to be solved by the invention

An object of the present invention is to provide an interworking device between two different networks which mutually convert protocols between two networks that are not capable of mutual communication and mutually interoperate two networks using mutually agreed codec information.

3. Summary of Solution to Invention

The present invention, in the interworking device between two different networks, has a built-in H.323 protocol to communicate with the gatekeeper, transfer the message received from the gatekeeper to the ITP block and the protocol-converted message from the ITP block An IHP block for receiving and delivering the received gatekeeper; An ISP block having a built-in SIP to communicate with a proxy, deliver a message received from the proxy to the ITP block, and receive a protocol-converted message from the ITP block and deliver the message to the proxy; And receiving the message from the IHP block, converting the H.323 protocol into the SIP protocol, and delivering the message to the ISP block, receiving the message from the ISP block, converting the SIP into the H.323 protocol, and delivering the message to the IHP block. It includes the ITP block.

4. Important uses of the invention

The present invention is used in the manganese interlock device.

Interworking devices, two different networks, Session Initiation Protocol (SIP), H.323 protocol

Description

Interworking device between two different networks {Apparatus for linking between one Network and another Network}

1 is an overall configuration diagram of an H.323 network and a SIP network to which the present invention is applied.

Figure 2 is a detailed configuration diagram of an embodiment of a companion device between two different networks according to the present invention.

3 is a flowchart illustrating a case where a call initiation is requested from an H.323 terminal in a method of interworking between two different interworking devices according to the present invention;

4 is a flowchart illustrating a case where a call initiation request is made by a SIP terminal in a method of interworking between two different interworking devices according to the present invention;

* Explanation of symbols for the main parts of the drawings

11: H.323 terminal 12: Gatekeeper

13: SIP terminal 14: proxy

15: linkage device

The present invention relates to an interworking device between two different networks, and more particularly, a call processing is performed by H.323 (hereinafter referred to as "H.323") protocol of the International Telecommunication Union-Technology (ITU-T). The present invention relates to an interworking device between two different networks that mutually interoperate an H.323 network with a SIP network in which call processing is performed using the Session Initiation Protocol (SIP) of the Internet Engineering Task Force (IETF).

In an embodiment of the present invention will be described by taking an H.323 network and a SIP network as an example.

Internet telephony protocols can be divided into ITU-T's H.323 protocol and IETF's SIP. Often, a protocol is a protocol for a particular action. Therefore, usually one protocol protocols everything from the beginning. However, H.323 uses many existing protocols as sub-protocols because the goal itself covers a very wide field and provides new services by making full use of existing network configurations.

The protocol of H.323 is largely Audio related protocol, Video related protocol, Data related protocol, Call related protocol. It can be divided into Media Control Protocol. The H.323 protocol is often called the Umbrella protocol because it uses so many protocols as secondary protocols.

At present, the H.323 protocol has already been defined and the national standard has been established, and most Internet telephony companies are using gateways and H.323 terminals to connect to public telephone networks (PSTNs) that use the H.323 protocol. It is managing the basic services using Gatekeeper and H.323 terminal for call connection.

However, SIP, which is shorter in call connection time than the H.323 protocol and suitable for transmitting multimedia contents such as voice and video text, has recently been standardized in IETF as RFC.3261 (Requests for Comments 3261).

The basic function of SIP is to set up a call between voice over IP (VoIP) terminals such as a computer, an internet phone, a personal digital assistant (PDA), and a mobile phone. This is no difference from the ITU-T's H.323 protocol, but SIP is a text-based protocol that is easy to implement and Internet-compatible, making it compatible with other services. In particular, SIP is included as a component of all Internet terminals, all application services, and all network equipment to perform functions such as call setup, call management, and application service requests.

As a result, the evolution to SIP is accelerating among Internet telephony service providers and voice over IP (VoIP) equipment developers.                         

The problem is that these two protocols are independent of each other and do not interoperate. The H.323 protocol establishes a call only between H.323 terminals through a gatekeeper, and the SIP establishes a call only between SIP terminals through a proxy server.

Therefore, the IETF is currently working on the standardization of interworking to solve these problems, but only the Internet Draft is occasionally released, and there are many points other than the basic call setup. There is a problem that interworking between SIP networks is impossible.

The present invention has been proposed to solve the above problems, and provides an interworking device between two different networks that mutually convert protocols between two networks that are not mutually communicable and mutually interoperate two networks using mutually agreed codec information. There is a purpose.

The apparatus of the present invention for achieving the above object, in the interworking device between two different networks, has a built-in H.323 protocol to communicate with the gatekeeper, transfer the message received from the gatekeeper to the ITP block and An IHP block for receiving a protocol-converted message from an ITP block and delivering the message to the gatekeeper; An ISP block having a built-in SIP to communicate with a proxy, deliver a message received from the proxy to the ITP block, and receive a protocol-converted message from the ITP block and deliver the message to the proxy; And receiving the message from the IHP block, converting the H.323 protocol into the SIP protocol, and delivering the message to the ISP block, receiving the message from the ISP block, converting the SIP into the H.323 protocol, and delivering the message to the IHP block. It characterized in that it comprises the ITP block.

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The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an overall configuration diagram of an H.323 network and a SIP network to which the present invention is applied.

As shown in FIG. 1, the network to which the present invention is applied includes an H.323 domain in which call processing is performed by the H.323 protocol of ITU-T and a SIP domain in which call processing is performed by SIP of the IETF.

In more detail, the H.323 domain has a plurality of H.323 terminal 11, the information of the H.323 terminal 11 and includes a gatekeeper 12 for managing this when the call is connected; The SIP domain includes a plurality of SIP terminals 13 and a proxy 14 which has information of the SIP terminals 13 and manages the call connection.

The apparatus further includes an interworking function (IWF) 15 operating in a UNIX-based workstation for interworking the H.323 network and the SIP network according to the present invention.

Meanwhile, referring to the overall operation, the message transmitted from the H.323 terminal 0 is protocol-transformed by the companion device 15 through the gatekeeper 12 and then transmitted to the SIP terminal 0 via the proxy 14. On the contrary, the message transmitted from the SIP terminal n is protocol-transformed by the companion device 15 via the proxy 14 and then transmitted to the SIP terminal n via the gatekeeper 12.                     

2 is a detailed configuration diagram of an embodiment of a companion device between two different networks according to the present invention.

As shown in FIG. 2, an interworking device between two different networks according to the present invention includes an H.323 protocol, which communicates with a gatekeeper and transmits a message received from the gatekeeper to an IWP Tunneling Process (ITP) block. And an IHP (IWF H.323 Process) 21, SIP for receiving a protocol-converted message from the ITP block 22 and delivering it to the gatekeeper, and communicating with a proxy. An IWF SIP Process (23) block and an IHP block for delivering a message received from the proxy to an ITP block 22, receiving a protocol converted message from the ITP block 22, and delivering the message to the proxy. Receives a message from the H.323 protocol protocol conversion to SIP and transfers to the ISP block 23, and receives the message from the ISP block 23 to convert the SIP to H.323 protocol Afterwards, the ITP block 22, the IHP block 21, the ITP block 22, and the ISP block 23 for delivering to the IHP block 21 are driven, the state is monitored, and an error is automatically recovered to automatically recover. IWP Management Process (IMP) block 24 for maintaining call setup.

In the present invention, communication is performed between the IHP block 21 and the ITP block 22 and between the ISP 23 block and the ITP block 22 using a message queue, which is a communication protocol between internal processes.

In addition, IMP block 24 generates a child process to drive each of the blocks.

In addition, in the present invention, the interworking device 15 between two different networks may operate in a UNIX-based workstation.

3 is a flowchart illustrating a case where a call initiation is requested from an H.323 terminal side in a method of interworking between two different interworking devices according to the present invention.

First, the IHP block 21 receives a setup message requesting call initiation from the H.323 terminal (hereinafter referred to as “H.323”) terminal and transmits the setup message to the ITP block 22 (301). Then, the ITP block 22 protocol converts the setup message received from the H.323 terminal into an invitation message that can be recognized by the SIP network (302).

Subsequently, the ISP block 23 transmits the invitation message protocol converted by the ITP block 22 to the SIP terminal (303).

Then, the SIP terminal is one of the most appropriate codec, IP, port information related to the H.323 terminal included in the invitation message received from the ISP block 23, the codec, IP, port ( Port information is selected and transmitted to the ISP block 23 (304).

On the other hand, when the SIP terminal receives an invitation message that does not include a plurality of codecs, IPs, and port information related to the H.323 terminal from the ISP block 23, the plurality of codecs, IPs, and port information that it has Are sent to the ISP block 23.

Thereafter, the ISP block 23 determines whether the codec, IP, port information of the H.323 terminal selected by the SIP terminal, and a plurality of codec, IP, port information related to the SIP terminal (305). In this case, the codec, IP, and port information of the H.323 terminal selected by the SIP terminal means fast start in which codec negotiation is completed, and in the case of a plurality of codec, IP, and port information related to the SIP terminal. It means a normal start where codec negotiation is not completed. If it is determined that the codec, IP and port information of the H.323 terminal selected by the SIP terminal is received, the codec, IP and port information of the received H.323 terminal are transmitted to the ITP block 22 (306). Then, the ITP block 22 stores the codec, IP, and port information of the H.323 terminal received from the ISP block 23, and then converts the protocol to recognize the H.323 network to the IHP block 21. In step 307, the IHP block 21 receives the final codec information in which the codec negotiation is completed. Therefore, the IHP block 21 transmits the information to the gatekeeper without additional codec negotiation (308). This completes the call setup with a quick start.

On the other hand, if the determination result 305, if a plurality of codecs, IP, port information related to the SIP terminal is transmitted means that the codec negotiation is not made, a plurality of codecs, IP, port information related to the SIP terminal is the ITP block ( 22) (309). Then, the ITP block 22 converts a plurality of codecs, IPs, and port information related to the SIP terminal to be recognized by the H.323 network, and then transmits the information to the IHP block 21 (310).

Thereafter, the IHP block 21 includes a plurality of codecs related to SIP terminals received from the ITP block 22 using H.245 (hereinafter referred to as “H.245”) protocol included in the H.323 protocol. The most suitable one among IP and port information is selected (311), and the finally selected codec is transmitted to the ITP block 22 (312). This allows codec negotiation.                     

Then, the ITP block 22 converts the protocol so that the last selected codec in the IHP block 21 can be recognized by the SIP network, and then transmits the protocol to the ISP block 23 (313). The ISP block 23 transmits the codec information of the last selected SIP terminal to the proxy (314). This completes call setup with a normal start between the H.323 terminal and the SIP terminal.

Here, the IMP block 24 plays a role of controlling each of the blocks to perform their functions, and further plays a role of providing a call service without interruption by restarting each block.

Here, a criterion for determining whether a fast start or a normal start is whether the setup message, which is a call start request message, includes a plurality of codecs, IPs, and port information related to the H.323 terminal that requested the call start. That is, the setup message may or may not include a plurality of codecs, IPs, and port information related to the H.323 terminal.

4 is a flowchart illustrating a case where a call initiation request is made by a SIP terminal in a method of interworking between two different interworking devices according to the present invention.

First, the ISP block 23 receives an invitation message requesting call initiation from the SIP terminal and transmits the invitation message to the ITP block 22 (401). Then, the ITP block 22 converts the invitation message received from the SIP terminal into a setup message so as to be recognized by the H.323 network (402).

Thereafter, the IHP block 23 transmits the protocol-converted setup message to the H.323 terminal by the ITP block 22 (403).                     

Thereafter, the H.323 terminal selects one of the most suitable codec, IP, and port information from among a plurality of codecs, IP, and port information related to the SIP terminal included in the setup message received from the IHP block 21. Transmit to IHP block 21.

However, when the H.323 terminal fails to select the most suitable one codec, IP, port information among a plurality of codecs, IP, and port information associated with the SIP terminal, no information is transmitted to the IHP block 23. I never do that.

Thereafter, the IHP block 21 determines whether the codec information of the SIP terminal selected by the H.323 terminal has been received (404). In this case, when one piece of codec information selected by the H.323 terminal is transmitted, it means a fast start in which codec negotiation is completed, and in case of not receiving the codec, normal start is performed. it means. As a result, if the codec, IP, and port information related to the SIP terminal are received, the received codec, IP, and port information are transmitted to the ITP block 22 (405). Then, the ITP block 22 stores the codec information received from the IHP block 21, converts the protocol to be recognized by the SIP network, and transmits the protocol to the ISP block 23 (406). The ISP block 23 ) Receives the final codec information for which the codec negotiation is completed, and thus transmits to the proxy without additional codec negotiation (407). This completes the call setup with a quick start.

On the other hand, if the determination result (404), the codec, IP, port information associated with the SIP terminal is not received means that the codec negotiation is not made, so the IHP block 21 is included in the H.323 protocol. 408 (hereinafter referred to as “H.245”) protocol selects the most suitable one among a plurality of codecs, IPs, and port information related to the SIP terminal, and transmits the finally selected codec to the ITP block 22 (408). . This allows codec negotiation.

Then, the ITP block 22 converts the protocol so that the last selected codec in the IHP block 21 can be recognized by the SIP network, and then transmits it to the ISP block 23 (409). The ISP block 23 transmits the codec information of the finally selected SIP terminal to the proxy (410). This completes call setup with a normal start between the H.323 terminal and the SIP terminal.

Here, the IMP block 24 plays a role of controlling each of the blocks to perform their functions, and further plays a role of providing a call service without interruption by restarting each block.

On the other hand, when a call initiation request is made from the SIP terminal side, the call is started with a quick start because a plurality of codecs, IPs, and port information related to the SIP terminal requesting the call initiation are always included in the invitation message. Since codec negotiation may not be possible, the call is usually started at the beginning.

As described above, the method of the present invention may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form. Since this process can be easily implemented by those skilled in the art will not be described in more detail.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

As described above, the present invention guarantees protocol conversion between the H.323 network and the SIP network. Thus, the present invention has an effect of interworking without providing a separate network between operators serving each network.

In addition, the present invention has the effect of providing an uninterrupted service by automatically recovering when an abnormal state occurs through a modular process in interworking between the two protocols.

Claims (6)

In the interworking device between two different networks, An IHP block having a built-in H.323 protocol for communicating with a gatekeeper, transferring the message received from the gatekeeper to an ITP block, and receiving a protocol-converted message from the ITP block to the gatekeeper; An ISP block having a built-in SIP to communicate with a proxy, deliver a message received from the proxy to the ITP block, and receive a protocol-converted message from the ITP block and deliver the message to the proxy; And Receiving the message from the IHP block and converting the H.323 protocol to SIP to the ISP block, and receiving the message from the ISP block to convert the SIP to the H.323 protocol and transmitting the IHP block to the ITP Block Interworking device between two different manganese comprising. The method of claim 1, IMP block for controlling the operation of the IHP block, the ITP block and the ISP block, monitoring the status, and automatically recovering in case of an error to maintain the call setup Interworking device between two different manganese further comprising. The method according to claim 1 or 2, The IHP block is, The interworking device between two different networks, characterized in that the codec negotiation is performed using the H.245 protocol when the codec information between the H.323 terminal and the SIP terminal is not received. delete delete delete

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