KR20080110389A - Announcement system and the control method in ip multimedia subsystems network - Google Patents

Abstract

When the announcement system in the IMS network according to the present invention is confirmed that the call connection with the called terminal is impossible, the call attempt message is changed to an external media resource control device and the SDP of the calling terminal is included in the call request message. It includes a call processing switch for transmitting and performing a new SIP call setup process from the media resource control device to perform the announcement to the calling terminal, in the case of a SIP proxy using only the announcement function, a separate external application server You can save money by not having to.

Description

Announcement system and the control method in IP Multimedia Subsystems network

1 is a functional block diagram showing the configuration of an announcement system in a conventional IMS network.

2 is a functional block diagram showing the configuration of an announcement system in an IMS network according to the present invention;

3 is a first signal flow diagram for providing announcement in an announcement system in an IMS network according to FIG. 2;

4 is a second signal flow diagram for providing announcement in an announcement system in an IMS network according to FIG. 2;

5 is a flowchart illustrating a method for controlling announcement service in an IMS network according to the present invention.

FIG. 6 is a flowchart illustrating detailed steps of transmitting and receiving bend-specific information to and from a media resource control device in the announcement broadcasting control method in the IMS network of FIG. 5.

FIG. 7 is a flowchart illustrating another detailed step of transmitting / receiving bend-specific information with a media resource control device in the announcement broadcasting control method in the IMS network according to FIG. 5.

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

10: calling party terminal 20: called party terminal

100 call processing exchanger 110 call processing unit

120: announcement broadcasting processing unit 200: home subscriber server

300: media resource control device

The present invention relates to an announcement system and a control method thereof in an IMS network.

During the session setup, the call is not normally routed from the network entity (NE), which serves as a Session Initiation Protocol (SIP) proxy, such as a call processing exchange (CSCF; Session Control Function) of 3GPP IMS network, to the called party. When a call fails, the call is terminated by sending an announcement to the calling party to indicate the cause of the call failure. That is, a representative example is the sending of the unassigned prefix guide.

In the call processing exchange structure recommended by the 3GPP IMS standard, there is no separate block for transmitting announcements in the call processing exchange, so to transmit announcements, a SIP AS (Application Service) for mediating a media resource control function is required. It implements the block internally and transmits the announcement broadcast in connection with the media resource control devices of various vendors.

As shown in FIG. 1, in the conventional IMS network or the SIP network, when an announcement broadcast is required, an external SIP application server 400 is required, and the announcement processing configuration information is transmitted to the call processing exchange 100 and the external application server in the IMS server. (400) had to share.

In particular, the media resource control device 300 interworking interface Mr recommended by 3GPP only needs to satisfy the interworking standard of RFC3261.

Therefore, in order to play a media chip in the media resource control apparatus 300, the media information control apparatus 300 must additionally exchange information promised by each vendor.

Most of the commercially available media resource control apparatuses 300 need to additionally deliver XML or media chip information to the media resource control apparatus 300 through a SIP message or a SIP message body.

So you can't send announcements by simple SIP rerouting or redirecting.

The call processing exchange of the conventional IMS network has a problem that there is no guide broadcasting function provided as a basic function of the exchange in the existing PSTN, CDMA network and the like.

Accordingly, an object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a function of transmitting a broadcast announcement by interworking an external media resource control device in a 3GPP network or a SIP server network (CSCF) or SIP. The present invention provides an announcement system and control method in an IMS network embedded in a proxy.

According to an aspect of the announcement system in the IMS network according to the present invention for achieving the above object, if it is confirmed that the call connection with the called terminal is impossible, at the same time changing the call attempt to the external media resource control device It includes a call processing exchange for controlling to perform the announcement by the SDP of the calling terminal in the call request message and performing a new SIP call setup process from the media resource control device to the calling terminal.

The call processing exchange determines whether the called terminal is available for call connection through the home subscriber server when a call request message for access from the calling terminal to the called terminal is received, and if the call connection is not possible, the SDP of the calling party is called. Call processing unit for transmitting a call request message including a media resource control device; And an announcement broadcast processing unit transmitting a call request message provided from the call processing unit to the media resource control device to perform a SIP call setup process.

The announcement broadcasting processor transmits / receives the bend information with the media resource control device after performing a new SIP call setup process.

Bend-specific information transmitted / received by the announcement broadcasting processing unit with the media resource control device includes features required for announcement broadcasting such as media chip information such as announcement number, repetition frequency information, and duration information. Information is included in the header of the information message or in the message body.

When the call processing exchange receives a 200OK message from the media resource control device during a new SIP call setup process with the media resource control device, the call processing exchange transmits an ACK message to the media resource control device after checking the SDP. The 200 OK message received from the device is converted into a 183 Session progress message and transmitted to the calling terminal so as to transmit the announcement to the calling terminal from the media resource control device.

When the call processing exchange receives a cancel message from the calling terminal, the call processing exchange transmits a 200 OK message and a 487 Request Terminated message to the calling terminal, and simultaneously sends a cancellation message to the media resource control device to terminate the call. To process

The call processing exchange transmits a 200 OK message received from the media resource control device to the calling terminal, establishes a call between the calling terminal and the media resource controlling device, and provides announcement from the media resource controlling device. .

When the call processing exchange receives the BYE message from the originating terminal, the call processing exchange performs a process for terminating the call associated with the media resource control device.

According to an aspect of a method for controlling announcement service in an IMS network according to the present invention, when it is confirmed that the announcement connection processing unit in a call session control system cannot connect to a called terminal through a home subscriber server, an external media resource control device And changing the call attempt and including the SDP of the calling terminal in the call request message and transmitting the SDP of the calling terminal, and performing a new SIP call setup process to perform announcement broadcasting from the media resource controller to the calling terminal. do.

The controlling of the announcement from the media resource control device to the calling terminal may include: when the call processing unit receives a call request message for access from the calling terminal to the called terminal, the called terminal is called through the home subscriber server. Determining whether the connection is possible, and if the call connection is impossible, transmitting a call request message including an SDP of the calling party to the media resource control apparatus; And

And transmitting a call request message provided from the call processing unit to the media resource control device to perform a SIP call setup process.

The guide broadcasting control method in the IMS network further includes the step of transmitting / receiving vendor information with the media resource control apparatus after the guide broadcasting processor performs a new SIP call setup process.

The step of transmitting / receiving the media resource control device and the bend-specific information may include attribute information necessary for transmitting an announcement such as media chip information such as an announcement number, repetition frequency information, and duration information. It is delivered in the header of the information message or the message body.

The controlling of the announcement broadcast processing unit to perform announcement broadcasting from the media resource control device to the calling terminal may include: 200OK from the media resource control device during a new SIP call setup process with the media resource control device. Checking an SDP and transmitting an ACK message to the media resource control apparatus upon receiving the message; Converting, by the announcement broadcasting processor, the 200 OK message received from the media resource control device into a 183 Session progress message and transmitting the announcement message to the calling terminal by transmitting the announcement broadcasting from the media resource controlling device to the calling terminal. do.

When the call processor receives a cancel message from the calling terminal, transmitting a 200 OK message and a 487 Request Terminated message to the calling terminal, and simultaneously transmitting a cancel message to the announcement broadcasting processor; And transmitting a cancellation message received by the announcement broadcasting processor to the media resource control device to process call termination.

The controlling of the announcement broadcasting processor to perform announcement broadcasting from the media resource control device to the calling terminal may include: receiving, by the call processing unit, a 200 OK message received from the media resource controlling device through a call processor. And setting up a call between the calling terminal and a media resource control device to provide a guide broadcast from the media resource control device.

The controlling of the announcement broadcasting processor to perform announcement broadcasting from the media resource control device to the calling terminal may include interworking with the media resource controlling device when the announcement broadcasting processor receives a BYE message from the calling terminal through a call processor. And performing a process for terminating the established call.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the announcement system and the control method in the IMS network according to the present invention will be described in detail. At this time, it will be understood by those of ordinary skill in the art that the system configuration described below is a system cited for the purpose of the present invention and does not limit the present invention to the following system.

2 is a diagram showing the configuration of an announcement system in an IMS network according to the present invention. The announcement system in an IMS network according to the present invention includes a call processing switch 100, a home subscriber server 200, and media resource control. Apparatus 300 is included, and the call processing exchange 100 includes a call processor 110 and a guide broadcast processor 120.

When the call processing exchange 100 determines that the call connection with the called terminal 20 is impossible, it redirects the call attempt and at the same time the SDP (Session Description) of the calling terminal 10 in the call request message. Protocol) and transmits to the external media resource control device 300 and performs a new SIP call setup process to control the announcement to the calling terminal 10 from the media resource control device 300.

Here, the call processing unit 110 of the call processing exchange 100 receives a call request message for accessing the called terminal 20 from the calling terminal 10 through the home subscriber server 200. While determining whether the call connection is possible, if the call connection is impossible, the call 20 transmits the call request message including the SDP of the calling party to the announcement broadcasting processing unit 120.

In addition, the announcement broadcasting processing unit 120 of the call processing exchange 100 transmits a call request message provided from the call processing unit 110 to the media resource control apparatus 300 to perform a SIP call setup process.

Meanwhile, the guide broadcast processor 120 transmits / receives bend information with the media resource control device 300 after performing a new SIP call setup process. Here, the bend-specific information transmitted / received by the announcement broadcasting processing unit 120 and the media resource control device 300 may be announcement broadcasting such as media chip information such as a announcement broadcast number, repetition frequency information, and duration information. Include attribute information required for transmission in the header of the information message or the message body.

When the announcement broadcast processing unit 120 receives a 200 OK message from the media resource control device 300 during the process of establishing a new SIP call with the media resource control device 300, the announcement broadcast processor 120 checks the SDP and then controls the media resource with an ACK message. And transmits the 200 OK message received from the media resource control device 300 to the 183 Session progress message and transmits the message to the calling party terminal 10 to the calling party from the media resource control device 300. To transmit the announcement to the terminal (10).

Subsequently, when the announcement broadcast processor 120 receives a cancel message from the calling terminal 10, the announcement broadcasting processor 120 transmits a 200 OK message and a 487 Request Terminated message to the calling terminal 10, and simultaneously sends a cancel message. The call termination is transmitted to the media resource control apparatus 300.

On the other hand, the announcement broadcast processing unit 120 transmits the 200 OK message received from the media resource control device 300 to the calling terminal 10, the calling terminal 10 and the media resource control apparatus 300. A call is set up to provide a guide broadcast from the media resource control apparatus 300.

At this time, the announcement broadcast processing unit 120, when receiving the BYE message from the calling terminal 10 performs a process for ending the call associated with the media resource control device 300.

The detailed description of the general functions and the detailed operations of the above-described elements will be omitted, and the operations will be described with reference to FIGS. 3 and 4 based on the operation corresponding to the present invention.

First, the calling terminal 10 transmits a call request message to the call processing exchange 100 to access the called terminal 20.

Then, the call processing unit 110 of the call processing exchange 100 checks the received call request message and accesses and checks the home subscriber server 200 to determine whether the called terminal 20 is accessible.

In this case, when the connection is possible, the received call request message is transmitted to the called party call processing switch 100 to perform a connection with the called terminal 20.

If it is confirmed that the call connection with the called terminal 20 is impossible, the call processing exchange 100 changes the call attempt to the external media resource control apparatus 300 and simultaneously sends a call request message to the calling terminal ( Including the SDP of 10) and performing a new SIP call setup process, the broadcast control from the media resource control device 300 to the caller terminal 10 is performed.

That is, when the call processing unit 110 of the call processing exchange 100 receives the call request message from the calling terminal 10, the call processing unit 110 accesses the home subscriber server 200 to determine whether the called terminal 20 is in an accessible state. Judge. Here, the connectable state of the called terminal 20 is a number in which the calling terminal 10 requested by the calling terminal 10 is normally registered, or the called terminal 20 is connected to an area where it can be connected. This is possible by checking whether or not it is located.

If it is impossible to connect to the called terminal 20, the call processing unit 110 of the call processing switch 100 is a guide broadcast processing unit 120 to the call request message including the SDP of the calling terminal 10 To send.

Subsequently, the announcement broadcasting processing unit 120 of the call processing exchange 100 transmits a call request message including an SDP of the calling terminal 10 to an external media resource control apparatus 300.

Thereafter, the announcement broadcasting processor 120 receives a 200 OK message from the media resource control device 300.

Then, as shown in FIG. 3, the announcement broadcast processing unit 120 transmits an ACK message to the media resource control device 300, and then transmits / receives bend information with the media resource control device 300. do. Here, the bend-specific information transmitted and received by the announcement broadcast processing unit 120 and the media resource control device 300 may include media chip information such as a announcement number, repetition frequency information, duration information, and the like. Attribute information necessary for transmitting the announcement is included in the header of the information message or the message body.

On the other hand, the announcement broadcast processing unit 120 converts the 183 Session Progress message that can be processed by the call processing unit 110 and transmits to the call processing unit 110. Here, the guide broadcast processor 120 simply removes a route (Route, Record-route) and the like used by the guide broadcast processor 120.

Subsequently, the call processing unit 110 transmits the 183 Session Progress message transmitted from the announcement broadcasting processing unit 120 to the calling terminal 10.

Therefore, the caller terminal 10 may be provided with the announcement broadcast from the media resource control device 300 in a state where a call is not set.

Thereafter, the announcement broadcast processing unit 120 receives a cancel message, not a BYE message, from the calling terminal 10. In this case, the reason for receiving the cancel message instead of the BYE message is that the call between the calling terminal 10 and the media resource control apparatus 300 is not set.

Therefore, the call processing unit 110 of the call processing exchange 100 receiving the cancellation message from the calling terminal 10 transmits a 200 OK message to the calling terminal 10 and simultaneously sends a 487 request terminated message to the calling terminal ( 10) and cancels the call request and at the same time transmits a cancellation message to the announcement broadcast processing unit 120.

Then, the announcement broadcasting unit 120 transmits a cancellation message to the media resource control device 300, and the media resource control device 300 transmits a 200 OK message and a 487 request terminated message to the announcement broadcasting processing unit 120. By the end of the announcement provided.

On the other hand, it will be described with reference to Figure 4 to provide a guide broadcast function through the method of connecting the call between the caller terminal 10 and the media resource control device 300.

The announcement broadcasting processing unit 120 of the call processing exchange 100 transmits a call request message including the SDP of the calling terminal 10 to an external media resource control apparatus 300.

Thereafter, the announcement broadcasting processor 120 receives a 200 OK message from the media resource control device 300.

Then, the announcement broadcast processor 120 transmits the 200 OK message received from the media resource control device 300 to the call processor 110.

Subsequently, the call processing unit 110 transmits a 200 OK message received from the announcement broadcasting processing unit 120 to the calling terminal 10 so as to call between the calling terminal 10 and the media resource control device 300. Set to provide the announcement from the media resource control device 300.

Subsequently, when the call processor 110 receives the BYE message from the calling terminal 10, the call processor 110 transmits the BYE message to the guide broadcast processor 120, and the guide broadcast processor 120 communicates with the media resource control device 300. Perform the procedure to terminate the interlocked call.

Next, a description will be given of a guide broadcast control method in an IMS network according to the present invention having the configuration described above.

First, the calling terminal 10 transmits a call request message to the call processing exchange 100 in order to connect with the called terminal 20.

Then, the call processing exchange 100 accesses the home subscriber server 200 and checks the position of the called terminal 20 to which the connection is to be made, and determines whether or not the connection is possible.

If it is confirmed that the call connection with the called terminal 20 is impossible, the announcement broadcasting processing unit 120 of the call processing exchange 100 changes the call attempt to the external media resource control device 300 and at the same time. The SDP of the calling terminal 10 is included in the call request message and transmitted, and a new SIP call setup process is performed to control the broadcast resource from the media resource control apparatus 300 to the calling terminal 10.

First, as shown in FIG. 5, when a call request message for access from the calling terminal 10 to the called terminal 20 is received, the call processing unit 110 receives the called terminal through the home subscriber server 200. While determining whether the call connection is possible, when the call connection is impossible, the 20 transmits a call request message including the SDP of the calling party to the announcement broadcast processing unit 120 (S10).

Subsequently, the announcement broadcasting processing unit 120 transmits a call request message provided from the call processing unit 110 to the media resource control apparatus 300 to perform a new SIP call setup process (S20).

Thereafter, after performing a new SIP call setup process, the announcement broadcast processing unit 120 transmits / receives bend information with the media resource control device 300 (S30). Here, the bend-specific information includes attribute information necessary for transmitting an announcement such as media chip information such as an announcement number, repetition frequency information, and duration information in a header or message body of an information message. do.

Hereinafter, the step (S30) of controlling the guide broadcasting processing unit 120 to perform the guide broadcasting from the media resource control device 300 to the calling terminal 10 will be described in detail with reference to FIG. .

First, when the announcement broadcast processing unit 120 receives a 200 OK message from the media resource control device 300 during a new SIP call setup process with the media resource control device 300, the SDP checks the SDP and then sends an ACK message to the media. It transmits to the resource control device 300 (S31).

Subsequently, the announcement broadcast processing unit 120 converts the 200 OK message received from the media resource control apparatus 300 into a 183 Session progress message and transmits the message to the call processing unit 110 (S32).

Then, the call processing unit 110 transmits the 183 Session progress message to the calling terminal 10 and transmits the guide broadcast from the media resource control apparatus 300 to the calling terminal 10 (S33).

Subsequently, when the call processing unit 110 receives a cancel message from the calling terminal 10, the call processing unit 110 transmits a 200 OK message and a 487 Request Terminated message to the calling terminal 10, and guides the canceling message. The broadcast processor 120 transmits the data to the broadcast processor 120 (S34).

Then, the announcement broadcast processing unit 120 transmits a cancellation message to the media resource control device 300 to process the call cancellation (S35).

On the other hand, in the following it will be described in detail with reference to Figure 7 the step (S30) for controlling the guide broadcast processing unit 120 to perform the guide broadcast from the media resource control device 300 to the calling terminal (10). do.

That is, the announcement broadcast processing unit 120 transmits the 200 OK message received from the media resource control device 300 to the calling terminal 10 through the call processing unit 110 and the calling terminal 10. A call is set between the media resource control apparatuses 300 and the provision of the announcement broadcast is controlled through the media resource control apparatus 300 (S36).

Thereafter, when the announcement broadcasting processor 120 receives the BYE message from the calling terminal 10 through the call processing unit 110, a process for terminating a call interworking with the media resource control apparatus 300 is performed ( S37).

Although the present invention has been described in detail only with respect to the specific embodiments described, it will be apparent to those skilled in the art that various changes and modifications can be made within the spirit of the present invention, and such modifications and modifications belong to the appended claims. .

As described above, according to the guidance broadcasting system and control method thereof in the IMS network according to the present invention, in the case of the SIP proxy using only the guidance broadcasting function, it is possible to reduce the cost by not having a separate external application server. have.

In addition, by including the block responsible for the announcement in the call processing exchange has the effect that does not affect the function of the call processing exchange.

Claims (16)

In an announcement system in an IMS network that provides announcement through an external media resource control device when a call processing of a terminal fails in an IMS network using SIP, If it is confirmed that the call connection with the called terminal is impossible, the call attempt is changed to an external media resource control device and the SDP of the calling terminal is included in the call request message and transmitted, and a new SIP call setup process is performed to perform the media. An announcement system in an IMS network including a call processing exchange for controlling announcement from a resource control device to an originating terminal. The method of claim 1, The call processing exchanger, When a call request message for access from the calling terminal to the called terminal is received, it is determined through the home subscriber server whether the called terminal can connect to the call, and if the call connection is impossible, a call request message including the calling party's SDP. A call processing unit for transmitting the to the media resource control apparatus; And And an announcement broadcast processing unit for transmitting a call request message provided from the call processing unit to the media resource control device to perform a SIP call setup process. The method of claim 2, The announcement broadcasting processing unit, The broadcast system in the IMS network, characterized in that for transmitting and receiving the media resource control device and the bend (vendor) information after performing a new SIP call setup process. The method of claim 3, wherein Bend-specific information transmitted and received by the announcement broadcasting processing unit and the media resource control device is IMS, characterized in that delivered in the header or message body of the information message, such as attribute information, such as media chip information, such as announcement number, repetition frequency information, duration information, etc. Announcement system in the network. The method of claim 1, The call processing exchanger, If a 200 OK message is received from the media resource control device during a new SIP call setup process with the media resource control device, an SACK is confirmed and an ACK message is transmitted to the media resource control device, and 200 OK received from the media resource control device. And converting the message into a 183 Session progress message and transmitting the message to the calling terminal so as to transmit the announcement to the calling terminal from the media resource control device. The method of claim 5, The call processing exchanger, When a cancel message is received from the calling terminal, a 200 OK message and a 487 Request Terminated message are transmitted to the calling terminal, and at the same time, a cancellation message is sent to the media resource control device to handle call termination. Announcement broadcasting system in IMS network. The method of claim 1, The call processing exchanger, IMS, characterized in that to send a 200 OK message received from the media resource control device to the calling terminal to establish a call between the calling terminal and the media resource control device to provide the announcement from the media resource control device. Announcement system in the network. The method of claim 7, The call processing exchanger, And receiving a BYE message from the calling terminal, performing a procedure for terminating a call interworking with a media resource control device. In the method of providing announcement of an announcement system in an IMS network when a call processing failure of a terminal in an IMS network using SIP, If the announcement processing unit determines that the call connection with the called terminal is not possible through the home subscriber server, the call attempt message is changed to the external media resource control device and the SDP of the calling terminal is included in the call request message and transmitted. And controlling to perform an announcement service from the media resource control device to an originating terminal by performing a SIP call setup process. The method of claim 9, The controlling of the announcement from the media resource control device to the calling terminal may include: When the call processing unit receives a call request message for access from the calling terminal to the called terminal, the call processing terminal determines whether the called terminal is able to connect through the home subscriber server, and if the call connection is impossible, includes the SDP of the calling party. Transmitting a call request message to a media resource control device; And And transmitting the call request message provided from the call processing unit to the media resource control device to perform a SIP call setup process. The method of claim 10, Guide broadcast control method in the IMS network, And transmitting / receiving the Vendor information with the media resource control device after performing the new SIP call setup process by the announcement broadcasting processing unit. The method of claim 11, Transmitting / receiving the media resource control device and the bend-specific information, IMS, characterized in that delivered in the header or message body of the information message, such as attribute information, such as media chip information, such as announcement number, repetition frequency information, duration information, etc. Guide Broadcasting Control Method in Network. The method of claim 10, The controlling of the announcement broadcasting processing unit to perform announcement broadcasting from the media resource control apparatus to the calling terminal, When the announcement broadcasting processor receives a 200OK message from the media resource control device during a new SIP call setup process with the media resource control device, checking an SDP and transmitting an ACK message to the media resource control device; And The announcement processing unit converts the 200 OK message received from the media resource control device into a 183 Session progress message and transmits the announcement to the calling terminal through the call processor to send the announcement to the calling terminal. Guide broadcast control method in an IMS network comprising the step of. The method of claim 13, When the announcement processing unit receives a cancel message from the calling terminal through a call processing unit, a 200 OK message and a 487 Request Terminated message are transmitted to the calling terminal through a call processing unit, and a cancellation message is simultaneously sent to the calling broadcast processing unit. Transmitting to; Wow And transmitting the cancel message received by the announcement broadcasting processor to the media resource control device to process call termination. The method of claim 10, The controlling of the announcement broadcasting processing unit to perform announcement broadcasting from the media resource control apparatus to the calling terminal, The announcement broadcasting processor transmits the 200 OK message received from the media resource control apparatus to the calling terminal through the call processing unit to establish a call between the calling terminal and the media resource controlling apparatus to guide the call from the media resource controlling apparatus. The guide broadcasting control method in the IMS network further comprising the step of providing a broadcast. The method of claim 15 The controlling of the announcement broadcasting processing unit to perform announcement broadcasting from the media resource control apparatus to the calling terminal, And performing a process for terminating a call interworking with a media resource control device when the announcement broadcast processor receives a BYE message from the caller terminal through the call processor.

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