KR101308313B1 - Method for preventing call connection failure in video telephony system providing multimedia ring back tone service - Google Patents

Abstract

In a video call connection failure avoidance method in a video telephone system providing a multimedia ringback tone service according to an embodiment of the present invention, the method comprises: responding to a call connection request from an originating terminal and receiving a first message from the originating terminal ; Analyzing the received first message to determine whether the first message is valid; And if it is determined that the first message is invalid, initiating a call session with the originating terminal based on the second message received after the first message.

Multimedia ringback service, video call, connection failure avoidance, H.245, NSRP, 3GPP, H.324, H.323

Description

How to avoid call connection failure in video telephony system providing multimedia ringback tone service {METHOD FOR PREVENTING CALL CONNECTION FAILURE IN VIDEO TELEPHONY SYSTEM PROVIDING MULTIMEDIA RING BACK TONE SERVICE}

Embodiments of the present invention relate to a method of avoiding call connection failure in a video telephony system providing a multimedia ringback tone service.

H.324 is an International Telecommunication Union (ITU) protocol standard for multimedia communications in general switched networks (GSTN). H.324M is an extension of H.324 for operations in mobile networks, and 3G-324M is a third-generation joint program (3GPP) that defines 3GPP internal use and also defines the adaptation of H.324M adopted by 3GPP2. Is recommended. Devices and systems employing protocols based on or derived from H.324 are referred to as H.324-like equipment. H.324-type equipment may be connected to other H.324-type equipment via an exchange, and may be connected to non-H.324-type equipment through a multimedia gateway.

An example of such an H.324 type equipment is a video telephony system that provides a multimedia ringback service. When the video calling system attempts to make a video call from the calling terminal to the called terminal, after the call setup, before the called terminal answers, the video telephone system first connects to the multimedia ringback server, opens an H.324 session, and receives the multimedia ringback service. (call setup ~ H.245 fast negotiation).

The video telephony system may initiate a second H.324 session between the calling terminal and the called terminal (connect to H.245 negotiation at the called terminal). By the way, the existing video telephone system assumes that a call is connected and starts an H.324 session when the called party responds, but in reality, the connection between the calling terminal and the multimedia ringback server is not lost. In the non-call state, the call channel between the calling terminal and the multimedia ringback server may be switched first.

Thus, in the existing video telephony system, while the calling terminal receives a call connect to terminate the existing H.324 session and prepares for a new H.324 session, the called terminal may receive an incorrectly transmitted message, i.e., multimedia ringback. Receive messages that need to be sent to the server.

Accordingly, the called terminal sets the sequence number of the Numbered Simple Retransmission Protocol (NSRP) layer of H.324 to handle an H.245 message to an incorrect value, which causes the calling terminal to transmit an existing H.324 session (called terminal). After closing the session between the multimedia ringback server and the multimedia ringback server), the sequence number of the newly sent normal message is treated as an error, thereby causing the video call session to fail due to a time out, resulting in a call disconnection.

The present invention has been made to improve the prior art as described above, to avoid the protocol error that occurs when switching to a new video call session (call between subscriber terminals) of the video call (for multimedia ringback service) For the purpose of

The present invention aims to avoid a call disconnection between subscriber stations by avoiding a protocol error that occurs when a video call is switched through a slight protocol modification.

The object of the present invention is not limited to the above-mentioned objects, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object and solve the problems of the prior art, a video call failure avoiding method in a video telephone system providing a multimedia ringback tone service according to an embodiment of the present invention, the call connection request from the calling terminal In response, receiving a first message from the originating terminal; Analyzing the received first message to determine whether the first message is valid; And if it is determined that the first message is invalid, initiating a call session with the originating terminal based on the second message received after the first message.

The initiating a call session with the originating terminal may include: resetting a predetermined numbered simple retransmission protocol (NSRP) session related sequence value based on the first message; Setting the sequence value based on a second message received after the first message; And initiating a call session with the originating terminal based on the set sequence value.

The determining of the validity of the first message may include a video space time exchange command, various video space time indications, a video fast picture command, and a video fast picture command. If at least one of the FAST UPDATE PICTURE COMMAND, or CLOSE LOGICAL CHANNEL ACKNOWLEDGE MESSAGE is included, it may include determining that the first message is invalid.

Receiving a first message from the originating terminal comprises receiving the first message while waiting for a termination status for at least one of level detection or capability exchange, interoperating with a response to the call connection request. can do.

In the video call connection failure avoidance method in a video telephone system providing a multimedia ringback tone service according to another embodiment of the present invention, in response to a call connection request from the calling terminal, receiving a first message from the calling terminal ; If the received first message is the first message received after the response, determining whether the NSRP session related sequence value is valid using the first message and a third message before the first message. ; If it is determined that the sequence value is valid, setting the sequence value based on the first message; And initiating a call session with the originating terminal based on the set sequence value.

The determining of the validity of the sequence value may include: determining that the sequence value of the first message is valid when the sequence value of the first message and the sequence value of the third message are the same; Alternatively, when the sequence value of the first message is different from the sequence value of the third message, determining that the sequence value of the first message is invalid.

According to another embodiment of the present invention, a video call connection failure avoidance method in a video telephone system providing a multimedia ringback tone service may include: when the received first message is not the first message received after the response, The method may further include setting the sequence value based on one message.

According to another embodiment of the present invention, a video call connection failure avoidance method in a video telephone system providing a multimedia ringback tone service may further include discarding the first message if it is determined that the sequence value is invalid. It may include.

The details of other embodiments are included in the detailed description and the accompanying drawings.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, only the present embodiments to make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

According to embodiments of the present invention, by analyzing the message received from the originating terminal, by setting the message normally transmitted as the initial sequence value for the NSRP session between the originating terminal and the receiving terminal, the protocol air generated when switching video calls Can be avoided.

According to embodiments of the present invention, it is possible to prevent a video call connection failure between subscriber stations by avoiding a protocol error that occurs when a video call is switched.

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

1 is a diagram illustrating a network configuration of a video telephone system that provides a multimedia ringback tone service according to an embodiment of the present invention.

Referring to FIG. 1, the video telephone system performs a multimedia ringback service in step S160, and performs a video call connection process in step S170.

At this time, the video telephone system analyzes the characteristics of the H.245 message when switching channels, so that when the called terminal 150 responds, connection failure of the video call can be avoided. Here, the channel switching refers to the switching of the channel between the calling terminal 110 and the multimedia ringback server 140, the channel between the calling terminal 110 and the called terminal 150, the calling exchange 120, the called exchange 130 and the like.

In addition, the H.245 message is a message transmitted from the calling terminal 110 to the called terminal 150 while the call traffic channel is switched from the multimedia ringback server 140 to the called terminal 150. .

2 to 4 are diagrams for explaining a video call connection failure avoiding method in a video telephone system providing a multimedia ringback service according to an embodiment of the present invention. Specifically, FIG. 2 is a block diagram illustrating a configuration of a video telephone system for providing a multimedia ringback service according to an embodiment of the present invention, and FIG. 3 is a diagram illustrating a process of processing an NSRP message according to an embodiment of the present invention. 4 is a flowchart illustrating a process of processing an H.245 message according to an embodiment of the present invention.

First, a process of processing a Numbered Simple Retransmission Protocol (NSRP) message according to an embodiment of the present invention will be described in detail.

2 and 3, in step S310, the NSRP 224 of the called terminal 220 may receive a first NSRP message from the NSRP 214 of the calling terminal 210. In this case, the NSRP 224 of the called terminal 220 may receive the first NSRP message while waiting for a termination state for level detection, capability exchange, and the like.

Here, the originating terminal 210 transmits a first message as a video call connection request message for the video call connection request with the called terminal 220, where the NSRP 214 of the originating terminal 210 is the first message. The first NSRP message is included in the message and transmitted to the NSRP 224 of the called terminal 220. The NSRP 224 of the called terminal 220 may receive a first NSRP message included in the first message after responding to a call connection request from the calling terminal 210.

In operation S320, the NSRP 224 of the called terminal 220 may determine whether the received first NSRP message is the first NSRP message. That is, the NSRP 224 of the called terminal 220 may determine whether the received first NSRP message is the first NSRP message received after the response to the call connection request from the calling terminal 210. .

As a result of the determination, when the received first NSRP message is the first NSRP message (Yes direction of S320), in step S330, NSRP 224 of the destination terminal 220 is the first NSRP message and the By using the message prior to the first NSRP message, it may be determined whether the sequence number for the NSRP session is valid.

That is, when the sequence number of the first NSRP message and the sequence number of the previous message are the same, the NSRP 224 of the called terminal 220 may determine that the sequence number of the first NSRP message is valid. If the sequence number of the first NSRP message is different from the sequence number of the previous message, it may be determined that the sequence number of the first NSRP message is invalid.

As a result of the determination, when the sequence number of the first NSRP message is valid (“valid” direction in S330), in step S340, the NSRP 224 of the called terminal 220 may process the first NSRP message. .

That is, the NSRP 224 of the called terminal 220 may set a sequence number based on the first NSRP message, and initiate an NSRP session with the calling terminal 210 based on the set sequence number.

However, as a result of the determination, when the sequence number of the first NSRP message is invalid (“invalid” direction in S330), in step S350, the NSRP 224 of the called terminal 220 discards the first NSRP message. It can be disposed of.

Subsequently, the NSRP 224 of the called terminal 220 sets a sequence number using the second NSRP message received after the first NSRP message, and the NSRP session with the originating terminal 210 based on the set sequence number. May be initiated. Here, the second NSRP message may be included in a second message which is a video call connection request message transmitted from the originating terminal 210 to the called terminal 220 for the video call request, and the second message is the second message. This message is sent after message 1.

On the other hand, if the received first NSRP message is not the first NSRP message (No direction of S320), in step S360 NSRP 224 of the terminating terminal 220 by using the first NSRP message A flag and a sequence number can be set. Thereafter, the NSRP 224 of the called terminal 220 may start an NSRP session with the calling terminal 210 based on the set sequence number.

Hereinafter, a process of processing an H.245 message according to an embodiment of the present invention will be described in detail.

2 and 4, in step S410, the H.245 222 of the called terminal 220 may receive the first H.245 message from the H.245 212 of the calling terminal 210. have. In this case, the H.245 222 of the called terminal 220 may receive the first H.245 message while waiting for a termination state for level detection, capability exchange, and the like.

Here, the originating terminal 210 transmits a first message as a video call connection request message to the called terminal 220 to request a video call connection, wherein the first message includes the first H.245 message. To the destination terminal 220. The H.245 222 of the called terminal 220 may receive a first H.245 message included in the first message after responding to a call connection request from the calling terminal 210.

However, the H.245 222 of the called terminal 220 is a second channel (calling terminal 210) in the first channel (the channel between the calling terminal 210 and the multimedia ringback server (see "140" in FIG. 1)). ) And a channel to be sent to the multimedia ringback server, as a first H.245 message. Therefore, in the present embodiment, it is necessary to analyze the first H.245 message to determine whether the first H.245 message is a message to be sent to the multimedia ringback server. This function may be performed by step S420.

In step S420, the H.245 222 of the called terminal 220 may analyze the received first H.245 message to determine whether the first H.245 message is valid. In other words, the H.245 222 of the terminating terminal 220 determines whether the first H.245 message should be sent to the multimedia ringback server as described above, but is incorrectly transmitted to the terminating terminal 220. can do.

For example, the H.245 222 of the terminating terminal 220 responds to the first H.245 message by using a video space time exchange command and various video space time indications. It may be determined whether incorrectly transmitted data, such as a VIDEO FAST UPDATE PICTURE COMMAND or a CLOSE LOGICAL CHANNEL ACKNOWLEDGE MESSAGE, is included.

As a result of the determination, if the incorrectly transmitted data is included in the first H.245 message, the H.245 222 of the destination terminal 220 indicates that the first H.245 message is invalid, that is, invalid. It can be judged that. On the contrary, if the determination result indicates that the first H.245 message does not include the incorrectly transmitted data and includes normally transmitted data (eg, CESE_REQUEST_MSG, MSDSE_REQUEST_MSG, etc.), the H.245 of the called terminal 220 is determined. 222 may determine that the first H.245 message is valid.

In step S420, when it is determined that the first H.245 message is not valid (No direction in S420), in step S430, H.245 222 of the destination terminal 220 is NSRP ( The flag and sequence number of 224 may be reset. In other words, when the first H.245 message is invalid, the H.245 222 of the terminating terminal 220 indicates that the first message including the first H.245 is the multimedia ringback server ("140 of FIG. 1"). A message and a sequence number of the NSRP 224 of the called terminal 220, which are preset by the first NSRP message included in the first message, may be reset.

Next, in step S440, the H.245 222 of the called terminal 220 may discard and discard the invalid first H.245 message.

Next, the H.245 222 of the called terminal 220 may set a flag and a sequence number of the NSRP 224 using the second message received after the first message.

That is, the second message may include a second H.245 message and a second NSRP message. The H.245 222 of the called terminal 220 uses the second H.245 message to receive the called terminal 220. NSRP 224 may control to set a flag and sequence number. Accordingly, the NSRP 224 of the called terminal 220 may set a flag and sequence number using the second NSRP message. Next, the NSRP 224 of the called terminal 220 may initiate an NSRP session with the calling terminal 210 using the set sequence number.

Next, the H.245 222 of the destination terminal 220 may initiate the call connection by generating an H.245 session with the originating terminal 210 in association with the start of the NSRP session.

On the other hand, when it is determined in step S420 that the first H.245 message is valid (Yes direction in S420), in step S430, the H.245 222 of the terminating terminal 220 is the first. Can handle H.245 messages.

That is, the H.245 222 of the called terminal 220 uses the sequence number of the NSRP 224 preset by the first NSRP message included in the first message to establish an H.245 session with the calling terminal 210. And generate a call connection with the calling terminal 210 through the call.

Embodiments of the present invention include computer readable media including program instructions for performing various computer implemented operations. The computer readable medium may include program instructions, local data files, local data structures, or the like, alone or in combination. The media may be those specially designed and constructed for the present invention or may be those known to those skilled in the computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape, optical recording media such as CD-ROMs and DVDs, magneto-optical media such as floppy disks, and ROMs, And hardware devices specifically configured to store and execute the same program instructions. 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.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, Modification is possible. Accordingly, the spirit of the present invention should be understood only in accordance with the following claims, and all equivalents or equivalent variations thereof are included in the scope of the present invention.

1 is a diagram illustrating a network configuration of a video telephone system that provides a multimedia ringback tone service according to an embodiment of the present invention.

2 is a block diagram showing the configuration of a video telephone system for providing a multimedia ringback tone service according to an embodiment of the present invention.

3 is a flowchart illustrating a process of processing an NSRP message according to an embodiment of the present invention.

4 is a flowchart illustrating a process of processing an H.245 message according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

110, 210: calling terminal

120: outgoing exchange

130: incoming exchange

140: multimedia ringback server

150, 220: called terminal

212, 222: H.245

214, 224: NSRP

Claims (9)

In response to a call connection request from an originating terminal, receiving a first message from the originating terminal; Analyzing the received first message to determine whether the first message is valid; And If it is determined that the first message is invalid, initiating a call session with the originating terminal based on a second message received after the first message. Including, Determining whether the first message is valid, The first message includes a video temporal space trade command, various video temporal indications, a video fast picture command, or a logical channel end acknowledgment message. Determining that the first message is invalid when at least one of CLOSE LOGICAL CHANNEL ACKNOWLEDGE MESSAGE is included The video call connection failure avoidance method in a video telephone system providing a multimedia ringback tone service comprising a. The method of claim 1, Initiating a call session with the originating terminal, Resetting a predetermined numbered simple retransmission protocol (NSRP) session related sequence value based on the first message; Setting the sequence value based on a second message received after the first message; And Initiating a call session with the originating terminal based on the set sequence value; The video call connection failure avoidance method in a video telephone system providing a multimedia ringback tone service comprising a. delete The method of claim 1, Receiving the first message from the calling terminal, Receiving the first message while waiting for a termination status for at least one of level detection or capability exchange, interoperating with a response to the call connection request. The video call connection failure avoidance method in a video telephone system providing a multimedia ringback tone service comprising a. In response to a call connection request from an originating terminal, receiving a first message from the originating terminal; If the received first message is the first message received after the response, determining whether the NSRP session related sequence value is valid using the first message and a third message before the first message. ; If it is determined that the sequence value is valid, setting the sequence value based on the first message; And Initiating a call session with the originating terminal based on the set sequence value; The video call connection failure avoidance method in a video telephone system providing a multimedia ringback tone service comprising a. The method of claim 5, The determining of the validity of the sequence value, Determining that the sequence value of the first message is valid when the sequence value of the first message and the sequence value of the third message are the same; or Determining that the sequence value of the first message is invalid when the sequence value of the first message and the sequence value of the third message are different. The video call connection failure avoidance method in a video telephone system providing a multimedia ringback tone service comprising a. The method of claim 5, If the received first message is not the first message received after the response, Setting the sequence value based on the first message The video call connection failure avoidance method in a video telephone system providing a multimedia ring back tone service further comprising. The method of claim 5, If it is determined that the sequence value is invalid, Discarding the first message The video call connection failure avoidance method in a video telephone system providing a multimedia ring back tone service further comprising. A computer-readable recording medium having recorded thereon a program for performing the method of any one of claims 1, 2, and 4-8.

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