KR102220146B1 - System and method for matching voip protocol and media codec conversion and method for processing a call using the same - Google Patents

Abstract

Disclosed are a system and a method for matching a VoIP protocol to a media codec, which enable compatibility between old- and new-generation devices of communication control facilities for common entrance access control and inter-household communication, and a method for processing a call by using the same. The system for matching a VoIP protocol to a media codec, which is disposed between old- and new-generation devices to match VoIP protocols to media codecs of both the old- and new-generation devices, comprises: an old-generation device login processing unit for logging in to each of old-generation devices based on the household ID of the old-generation device to activate an external outgoing function of the old-generation device, receiving a call from the old-generation device; a VoIP protocol conversion unit for converting the signal protocol of the call received from the old-generation device and performing a protocol conversion operation between H.323 and an SIP or between SIPs; a call level correction unit for correcting the difference in the call levels of the call; a media codec conversion unit for converting the media codec of the old-generation device into the media codec used in the new-generation device; and a call transmission unit for transmitting a converted audio or video signal to the new- or old-generation device.

Description

VOIP protocol-media codec matching system and method, and call processing method using it {SYSTEM AND METHOD FOR MATCHING VOIP PROTOCOL AND MEDIA CODEC CONVERSION AND METHOD FOR PROCESSING A CALL USING THE SAME}

The present invention relates to a VOIP protocol-media codec matching system and method, and a call processing method using the same, and more particularly, compatibility between old and new generation devices of a communication control facility for access control and intergenerational communication. The present invention relates to a system and method for VOIP protocol-media codec matching and a call processing method using the same.

In large-scale apartments, such as apartments where thousands to tens of thousands of terminals are used, equipment built with older household devices due to changes in protocol standards or media codecs of terminals according to the development of technology at the time of installation, due to compatibility issues with new equipment There is a problem that it becomes impossible to replace the equipment in case of a new introduction or failure.

Replacing all of the old household devices at once is also problematic in terms of price, and it is almost impossible to exchange all of the household terminals owned by each household with the consent of the entire residents.

In the case of exchanging household devices in an existing apartment for reasons such as failure or to replace some equipment for upgrade of the common system system, use stock of old household devices compatible with the existing system or through individual work of the equipment company. Equipment is being supplied by working to make some new generation devices compatible with old generation devices.

In this case, there are limitations such as the holding period and quantity of stock, and even if you do not secure enough order quantity to perform a separate work for compatibility with the old version for some equipment, development work will be difficult.

0001) Korean Patent Registration No. 10-1630653 (2016. 06. 09.) (System and method for sending and receiving calls on a home network) 0002) Korean Patent Application Publication No. 2012-0052505 (2012. 05. 24.) (Communication control method and system for access control at the common entrance)

Therefore, the technical problem of the present invention is focused on this point, and an object of the present invention is to provide interoperability between two blocks through signal processing and media codec matching between a new introduction system of a new generation device and an existing generation device. VOIP for compatibility between old and new generation devices in communication control facilities for common entrance access control and intergenerational communication by developing a system that allows new generations to be transferred to new generation device blocks in sequence. It is to provide a protocol-media codec matching system.

Another object of the present invention is to provide a VOIP protocol-media codec matching method using the above-described VOIP protocol-media codec matching system.

Another object of the present invention is to provide a call processing method using the VOIP protocol-media codec matching system described above.

In order to realize the object of the present invention as described above, according to an embodiment, the VOIP 　 protocol-media codec matching 　 system that is arranged between the old generation device and the new generation device to match the VOIP 　 protocol and media codec of both generation devices is, An old household device login processing unit for receiving a call from the old household device by logging in to each of the old household devices based on the device's household ID to activate an external calling function of the old household device; A VOIP protocol conversion unit converting a signal protocol of a call received from the 　old household device, and performing a protocol conversion operation between H.323 and SIP or between SIP and SIP; A call step correction unit for correcting a difference in a call step of a call; A media codec conversion unit for converting the media codec used in the new generation device; And a calling unit for sending the converted audio signal or video signal to the new generation device or the older generation device.

In one embodiment, the media codec conversion unit may mutually convert an audio signal corresponding to the 　old generation device and an audio signal corresponding to the 　 new generation device, or the video signal corresponding to the 　old generation device and the 　 new generation device A media converter for converting corresponding video signals to each other; And an SDP converter that modifies and applies the information converted by the media converter to a Session Description Protocol (SDP) body of a signal protocol.

According to an embodiment in order to realize another object of the present invention as described above, the VOIP　protocol-media codec matching method is arranged between the old generation device and the new generation device to match the VOIP　 protocol and media codec of both generation devices. Logging in to each of the old household devices based on the household ID of the old household device, activating an external calling function of the old household device, and receiving a call from the old household device; Converting the signal protocol of the call received from the 　old household device, and performing a protocol conversion operation between H.323 and SIP or between SIP and SIP; Correcting the difference in the call step; Converting the 　 to a media codec used in a new generation device; And sending the converted audio signal or video signal to the 　 new generation device or the 　 old generation device.

In order to realize another object of the present invention as described above, a call processing method according to an embodiment includes the steps of, by a new generation device, transmitting an invite message, which is a call start message, to a call step correction unit; Transmitting, by the call step correction unit, an invite message, which is a call start message, to a VOIP protocol conversion unit; Transmitting an ARQ (Admission Request) message, which is a call start message, to an older generation device by the VOIP protocol conversion unit; Transmitting, by the older generation device, an ACF message, which is a call permission message, to the VOIP protocol conversion unit; Transmitting a setup message to the old generation device by the VOIP protocol conversion unit; Transmitting, by the older generation device, a connection message to a VOIP protocol converter; Transmitting, by the VOIP protocol conversion unit, a response message to a call step correction unit; Transmitting, by the call step correction unit, a temporary response message to the VOIP protocol conversion unit; After the call step correction unit performs a first state conversion process, transmitting a ring tone message, 183 message, to a new generation device, and performing a video connection between the old generation device and the new generation device; Checking whether a button has been pressed by a user in the old household device, and transmitting an INFO CONNECT message, which is an additional information message, to the VOIP protocol converter according to the button being pressed; Transmitting, by the VOIP protocol conversion unit, an INFO CONNECT message, which is an additional information message, to the call step correction unit; Transmitting a 200 message as a call connection message to the new generation device after the call step correction unit performs a second state conversion process; And transmitting, by the new generation device, a temporary response message to the call step correction unit, and connecting audio and video between the old generation device and the new generation device.

In order to realize another object of the present invention, a call processing method according to another embodiment includes the steps of: transmitting an H.323 setup message to a VOIP protocol conversion unit by an older generation device; The VOIP protocol conversion unit transmitting an invite message to a call step correction unit; The call step correction unit transmitting an invite message to the new generation device; Transmitting, by the new generation device, a 180 message to the call step correction unit; After the call step correction unit performs a first state conversion process, transmitting a call connection message 200 to the VOIP protocol conversion unit; The VOIP protocol conversion unit transmits an H.323 connection message to the old household device and transmits a temporary response message to the call step correction unit to video-connect the old household device and the new generation device; Checking whether a button has been pressed by a user in the new generation device, and transmitting a 200 message, which is a call connection message, to the call step correction unit according to the push of the button; After the call step correction unit performs a second state conversion process, transmitting an INFO CONNECT message, which is an additional information message, to a VOIP protocol conversion unit; The VOIP protocol conversion unit transmitting an H.323 facility connection message to the older generation device; And transmitting a temporary response message to the new generation device to connect the old generation device and the new generation device by voice and video connection.

According to the VOIP protocol-media codec matching system and method and the call processing method using the same, the interoperability between the two blocks is achieved through signal processing and media codec matching between the new introduction system of a new generation device and the existing old generation device. Develop a system that allows new generations to be transferred sequentially to the new generation device block, so that the communication control facility for access control and intergenerational communication is compatible with each other between the old and new generation devices. can do. Accordingly, the group using the old household equipment installed in the past and the group using the new household equipment can be fully interlocked, while the generation introducing the new household equipment can provide a better environment. Can reduce the cost burden of

1 is a block diagram schematically illustrating a VOIP protocol-media codec matching system 100 according to the present invention.
FIG. 2 is a block diagram illustrating the VOIP protocol-media codec matching system 100 shown in FIG. 1.
3 is a view for explaining an example of a login method by the old household device login processing unit 110.
4 is a diagram for explaining terminal login using a gatekeeper in H.323.
5 is a view for explaining another example of a login method by the old household device login processing unit 110.
6 is a diagram illustrating a call method in a situation (FIG. 3) of an example of a terminal login method using a gatekeeper.
7 is a diagram for explaining a call method in a situation (FIG. 5) of another example of a terminal login method using a gatekeeper.
8 is a flowchart illustrating a method of matching a VOIP protocol-media codec according to an embodiment of the present invention.
9 is a signal flow diagram for explaining call processing from a new generation device to an old generation device using the VOIP protocol-media codec matching system according to the present invention.
10 is a signal flow diagram for explaining call processing from an old generation device to a new generation device using the VOIP protocol-media codec matching system according to the present invention.

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

1 is a block diagram schematically illustrating a VOIP protocol-media codec matching system 100 according to the present invention.

Referring to FIG. 1, the VOIP protocol-media codec matching system 100 is disposed between the old generation device 200 and the new generation device 300 having different protocols and media codecs, and from the old generation device 200 After receiving a call, converting the signal protocol of the received call, correcting the difference in the call phase of the call, converting it to a media codec used in the new generation device 300, the call is sent to the new generation device 300. Alternatively, the VOIP protocol-media codec matching system 100 receives a call from the new generation device 300, converts the signal protocol of the received call, corrects the difference in the call stage of the call, and is used in the old generation device 200. After converting to a media codec, a call may be sent to the old generation device 200.

FIG. 2 is a block diagram illustrating the VOIP protocol-media codec matching system 100 shown in FIG. 1.

1 and 2, the VOIP protocol-media codec matching system 100 according to the present invention includes an old-generation device login processing unit 110, a VOIP protocol conversion unit 120, a call step correction unit 130, and SDP. It includes a converting unit 140, a media converting unit 150, and a call calling unit 160.

The old household device login processing unit 110 receives a call from the old household device 200.

The VOIP protocol conversion unit 120 converts the signal protocol of a call, and in particular, performs protocol conversion between H.323 and SIP or between SIP and SIP. Here, the H.323 protocol is a technology standard that enables audio, video, and data communications to be mutually transmitted over a network using IP such as the Internet, regardless of compatibility in business, entertainment, entertainment and professional fields. H.323 is a standard adopted to transmit voice and video data through a packet-switched network such as TCP/IP, UDP, etc., and is not a single protocol (protocol) defined by itself, but various protocols (H.224). , H.245, etc.), and is sometimes referred to as a protocol stack.

On the other hand, SIP (session initiation protocol) is a completely different protocol from H.323, which accepts the elements of HTTP and SMTP, which are Internet protocols. The SIP consists of a terminal called a SIP user agent (UA) and a SIP server that receives and responds to a SIP request from the UA.

The call step correction unit 130 corrects the difference in the call step of the call step 　 to overcome the compatibility 　 problem 　. It is not implemented in a general VOIP conversion server or soft switch, and the compatibility problem due to the difference in implementation between the old generation device 200 and the new generation device 300 is overcome through the process of correcting the difference in the call stage of the call. In this process, ID conversion of terminal information may also be performed. The reason this process is important is that some of the technical limitations, such as the function of the protocol at the time of implementing the old generation device 200, were implemented with some changes in the applied programming. This is because there is a limit to processing only by conversion.

For example, in the case of H.323 protocol, video connection was not possible before the other party received a call with the protocol technology at that time, but the access control system had a problem of having to preview the video of the common entrance before receiving the call. So, before pressing the receive button in the household, a CONNECT message was sent in advance, and the UI was implemented through a virtual connection (FACILITY CONNECT) when the user pressed the receive button. However, in the case of the later SIP protocol, it was possible to send the other party's video before connecting the call, so it was implemented as a normal standard connection procedure. So, if these two generation devices simply transmit a signal message through protocol conversion, there is a problem that the access control implementation does not work properly.

The media conversion unit 150 converts H.263 to H.264 or vice versa, and converts G.711 to G.729 or G.723 or vice versa to convert the media codec. That is, data is decoded using a media codec used by each generation device and then encoded with a required media codec to achieve data compatibility.

The SDP conversion unit 140 modifies and applies the information converted by the media conversion unit 150 to an SDP (Session Description Protocol) body of the signal protocol.

The call originating unit 160 sends the converted call. In general, when a call is sent to the new household device 300, the call processing server of the system recognizes it as an external call, but the exception rule is specified so that it is recognized the same as the internal terminal call. Implemented in server products.

In this embodiment, in order for the old household device login processing unit 110 to implement call reception from the old household device 200, there are two login implementation methods. The first implementation method is a method of activating the external sending function of the old generation device 200 as shown in FIG. 3 to be described later, and the second implementation method is a media conversion server in the middle as shown in FIG. 5 to be described later. This is a method of logging in to the old household device 200, which is a household terminal, with household information.

3 is a view for explaining an example of a login method by the old household device login processing unit 110.

Referring to FIG. 3, an RRQ message, which is a login message, is transmitted from the old household device login processing unit 110 to the gatekeeper of the old household device 200 using a protocol conversion server (Inter-Working Function: IWF). This is a method of logging in through a method of sending and receiving an RCF message from the old household device 200. In other words, it is a method of logging in with the representative ID.

4 is a diagram for explaining terminal login using a gatekeeper in H.323.

As shown in Fig. 4, when terminals each send a login message to the gatekeeper, the gatekeeper stores it in the DB or memory, and when a command for a call comes in, the ID in the message uses the address given when logging in. And try to connect.

5 is a view for explaining another example of a login method by the old household device login processing unit 110.

Referring to FIG. 5, the old household device login processing unit 110 sends an RRQ message, which is a login message based on the household ID, to each of the old household devices 200, and receives an RCF message from the corresponding old household device 200. This is how you log in through the method. That is, as many as the number of terminals is repeated.

The login implementation method shown in FIG. 3 is a better method for the operational efficiency of the VOIP protocol-media codec matching system 100, but when the old generation device 200 does not have an external calling function, the login implementation method shown in FIG. Can be implemented.

The login of the protocol conversion server (IWF) can be implemented in two ways.

Before explaining this, first, how to find the other party when trying to make a call in H.323 and SIP will be described.

<When initiating a call from the H.323 area>

In the early stages of H.323 development, H.323 terminals had all the access IP addresses of the other party to access in the form of a table, so when a specific ID was called, the IP address of that ID was used. In this case, there is a problem in that all terminals have all IP addresses of all available terminals and a problem in security processing for limiting calls, so a server module called a gatekeeper was proposed.

In the case of making a call by dividing into two areas having different protocols as in the present invention, in order to make a call to another protocol area that is not in its own area, it is necessary to know the other party's IP address. Does not send login messages to the original domain. In this case, in order to transfer the call attempted by the H.323 terminal to the SIP area through the protocol conversion server (IWF), the gatekeeper must check the ID and transfer it to the protocol conversion server (IWF).

There are two ways to do this.

In the first method, as shown in FIG. 6, if the terminal is not logged in to the H.323 area, it is treated as an exception and transferred to the protocol conversion server (IWF) unconditionally.

6 is a diagram illustrating a call method in a situation (FIG. 3) of an example of a terminal login method using a gatekeeper. In other words, the call is delivered using the gatekeeper's exception handling, and in the case of an exception, the call is unconditionally delivered to a special terminal. Protocol conversion server (IWF) is a case of logging in with the representative ID, IWF.

In the second method, as shown in FIG. 7, the protocol conversion server (IWF) logs in as an H.323 gatekeeper with the ID of each of the terminal IDs moved to SIP.

7 is a diagram for explaining a call method in a situation (FIG. 5) of another example of a terminal login method using a gatekeeper. For example, a case where the first terminal logs in in the H.323 area and the second to n-th terminals log in in the SIP area will be described.

When attempting to make a call through this method, the gatekeeper will attempt to connect based on the IP information of the logged in ID. This IP address is the protocol conversion server (IWF) logged in as if it were a terminal. It connects to the conversion server (IWF). That is, each terminal moved to the SIP logs in the protocol conversion server (IWF) on behalf of the gatekeeper.

Both the login method shown in FIG. 6 and the login method shown in FIG. 7 can be implemented, and there is no problem in operation. However, the first method, the login method shown in FIG. 6, has a disadvantage in that it is possible to implement the gatekeeper function only when there is a function for handling an exception.

The second method, the login method shown in Fig. 7, can be implemented even if the gatekeeper does not have a function for an exceptional situation, but when the number of mobile terminals increases, the system must continuously send a login message equal to the number of mobile terminals. There may be a lot of network load and server load.

Therefore, if possible, it is desirable to implement the login in the first method, and if the exception handling function does not exist in the gatekeeper, it is desirable to implement the login in the second method.

<When starting a call from the SIP area>

A server that operates similar to a gatekeeper in SIP is called a proxy. Proxy server is a recently used protocol, and most of the outbound call functions are implemented. Therefore, when the terminal is not logged in, it can be implemented to deliver a call to the protocol conversion server (IWF) as exception processing.

Of course, as in H.323 on the SIP side, protocol conversion server (IWF) can be made to log in for each terminal to implement, but it will not be necessary to implement that method.

8 is a flowchart illustrating a method of matching a VOIP protocol-media codec according to an embodiment of the present invention. In particular, the VOIP 　 protocol-media codec matching method of matching the VOIP 　 protocol and media codec of both generation devices by the VOIP protocol-media codec matching system arranged between the old generation device and the new generation device as described in FIG. 2 is described. do.

2 and 8, each log in with the household information of the old household device 200 and activate the external calling function of the old household device 200 to receive a call from the old household device 200 (step S110) .

The signal protocol of the received call is converted, but protocol conversion between H.323 and SIP or between SIP and SIP is performed (step S120).

In order to overcome the compatibility problem, the difference in the call step of the call is corrected (step S130).

It converts to a media codec used by the new generation device 300 (step S140). That is, data decoding using the Demere codec, encoding with a necessary codec, data compatibility with each other, and the converted information are modified and applied to the SDP body of the signal protocol.

The converted audio signal and/or video signal is sent to the new generation device 300 (step S150).

9 is a signal flow diagram for explaining call processing from a new generation device to an old generation device using the VOIP 　 protocol-media codec matching system according to the present invention. In particular, it is a flow chart for explaining the case of attempting a call connection from the new generation device 300 to the old generation device 200. For example, the new generation device 300 may be a device corresponding to a lobby phone, and the old generation device 200 may be a device corresponding to an in-house wall pad.

9, the new generation device 300 transmits an INVITE message to the call step correction unit 130 (step S300).

The call step correction unit 130 transmits an INVITE message to the VOIP protocol conversion unit 120 (step S302).

The VOIP protocol conversion unit 120 transmits a subscriber authentication request (ARQ, Admission Request) message to the old generation device 200 (step S304).

The older generation device 200 transmits a subscriber authentication acceptance (ACF, (Admission Confirm)) message to the VOIP protocol conversion unit 120 (step S306).

The VOIP protocol conversion unit 120 transmits a setup (SET UP) message to the older generation device 200 (step S308).

The older generation device 200 transmits a connection message to the VOIP protocol conversion unit 120 (step S310).

The VOIP protocol conversion unit 120 transmits a response message to the call step correction unit 130 (step S312).

The call step correction unit 130 transmits a temporary response message to the VOIP protocol conversion unit 120 (step S314).

After performing the first state conversion process (step S318), the call step correction unit 130 transmits the 183 message, which is a ring tone message, to the new generation device 300 (step S318). Accordingly, an image is connected between the old generation device 200 and the new generation device 300.

Subsequently, it checks whether the button has been pressed by the user in the old household device 200 (step S320), and transmits an INFO CONNECT message, which is an additional information message, to the VOIP protocol converter 120 as the button is pressed (step S322). Here, the push of the button may be performed when the user using the old household device 200 permits the voice call setting through a procedure such as checking the face of the user using the new household device 300.

The VOIP protocol conversion unit 120 transmits an INFO CONNECT message, which is an additional information message, to the call step correction unit 130 (step S324).

After performing the second state conversion process (step S326), the call step correction unit 130 transmits a 200 message, which is a call connection message, to the new generation device 300 (step S328).

The new generation device 300 transmits a temporary response message to the call step correction unit 130 (step S330). Accordingly, audio and video are connected between the old generation device 200 and the new generation device 300.

10 is a signal flow diagram for explaining call processing from an old generation device to a new generation device by using the VOIP 　 protocol-media codec matching system according to the present invention. In particular, it is a flow chart for explaining the case of attempting to connect a call from the old household device 200 to the new household device 300. For example, the old household device 200 may be a device corresponding to the in-house wall pad, and the new generation device 300 may be a device corresponding to the in-house wall pad of another generation or a lobby phone.

Referring to FIG. 10, the old generation device 200 transmits an H.323 setup message to the VOIP protocol conversion unit 120 (step S400).

Subsequently, the VOIP protocol conversion unit 120 transmits an invite message to the call step correction unit 130 (step S402).

Then, the call step correction unit 130 transmits an invite message to the new generation device 300 (step S404).

The new generation device 300 transmits the 180 message to the call step correction unit 130 (step S406).

Subsequently, the call step correction unit 130 performs the first state conversion process (step S408), and then transmits a 200 message, which is a call connection message, to the VOIP protocol converter 120 (step S410).

Subsequently, the VOIP protocol conversion unit 120 transmits the H.323 connection message to the old generation device 200 (step S412), and transmits a temporary response message to the call step correction unit 130 (step S414). Accordingly, an image is connected between the old generation device 200 and the new generation device 300.

Subsequently, it checks whether the button is pressed by the user in the new generation device 300 (step S416), and transmits a call connection message 200 message to the call step correction unit 130 as the button is pressed (step S418. ). Here, pressing of the button may be performed when the user using the new generation device 300 permits the voice call setting through a procedure such as checking the face of the user using the old generation device 200.

After performing the second state conversion process (step S420), the call step correction unit 130 transmits an INFO CONNECT message, which is an additional information message, to the VOIP protocol conversion unit 120 (step S422), and the VOIP protocol conversion unit 120 Transmits the H.323 facility connection message to the old generation device 200 (step S424).

The call step correction unit 130 transmits a temporary response message to the new household device 300 (step S426). Accordingly, audio and video are connected between the old generation device 200 and the new generation device 300.

As described above, according to the present invention, according to the present invention, when the internal call and the common entrance access control unit in the apartment house needs to be upgraded or the faulty part needs to be exchanged, the necessary amount of equipment, that is, failure or upgrade, without rebuilding the entire system Only equipment can be exchanged. This not only saves cost, but also makes it possible to upgrade the system sequentially so that even if there is no consent from some residents who are reluctant to upgrade due to problems such as cost, the system can be upgraded to a new generation device.

While the group using the existing system (or the old generation equipment) and the group using the new generation equipment are fully interlocked, the generation that introduces the new generation equipment can provide a better environment. Can reduce the cost burden of

Although the above has been described with reference to examples, it is understood that those skilled in the art may variously modify and change the present invention without departing from the spirit and scope of the present invention described in the following claims. You can understand.

100: VOIP protocol-media codec matching system
110: old household device login processing unit
120: VOIP protocol conversion unit 130: call step correction unit
140: SDP conversion unit 150: media conversion unit
160: caller 200: old household equipment
300: new generation equipment

Claims (6)

delete delete delete delete Transmitting, by a new generation device, an invite message, which is a call start message, to a call step correction unit;
Transmitting, by the call step correction unit, an invite message, which is a call start message, to a VOIP protocol conversion unit;
Transmitting an ARQ (Admission Request) message, which is a call start message, to an older generation device by the VOIP protocol conversion unit;
Transmitting, by the older generation device, an ACF message, which is a call permission message, to the VOIP protocol conversion unit;
Transmitting a setup message to the old generation device by the VOIP protocol conversion unit;
Transmitting, by the older generation device, a connection message to a VOIP protocol converter;
Transmitting, by the VOIP protocol conversion unit, a response message to a call step correction unit;
Transmitting, by the call step correction unit, a temporary response message to the VOIP protocol converter;
After the call step correction unit performs a first state conversion process, transmitting a ring tone message, 183 message, to a new generation device, and performing a video connection between the old generation device and the new generation device;
Checking whether a button has been pressed by a user in the old household device, and transmitting an INFO CONNECT message, which is an additional information message, to the VOIP protocol converter according to the button being pressed;
Transmitting, by the VOIP protocol conversion unit, an INFO CONNECT message, which is an additional information message, to the call step correction unit;
Transmitting a 200 message as a call connection message to the new generation device after the call step correction unit performs a second state conversion process; And
And transmitting, by the new generation device, a temporary response message to the call step correction unit, and connecting audio and video between the old generation device and the new generation device. The old generation device transmits an H.323 setup message to a VOIP protocol conversion unit;
The VOIP protocol conversion unit transmitting an invite message to a call step correction unit;
The call step correction unit transmitting an invite message to a new generation device;
Transmitting, by the new generation device, a 180 message to the call step correction unit;
The call step correction unit performing a first state conversion process and then transmitting a call connection message to the VOIP protocol conversion unit;
The VOIP protocol conversion unit transmits an H.323 connection message to the old household device and transmits a temporary response message to the call step correction unit to video-connect the old household device and the new generation device;
Checking whether a button has been pressed by a user in the new generation device, and transmitting a 200 message, which is a call connection message, to the call step correction unit according to the push of the button;
The call step correction unit performing a second state conversion process and then transmitting an INFO CONNECT message, which is an additional information message, to a VOIP protocol conversion unit;
The VOIP protocol conversion unit transmitting an H.323 facility connection message to the older generation device; And
And transmitting a temporary response message to the new generation device to connect the old generation device and the new generation device via audio and video connection.

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