KR100820968B1 - Method of sending a realtime fax data of a mobile communication terminal using an IMS network - Google Patents

Abstract

Disclosed is a real-time fax transmission method of a mobile communication terminal using an IMS (IP Multimedia Subsystem) network. In the real-time fax transmission method using an IMS network according to an embodiment of the present invention, registering with a registration server located in an IMS network to receive a real-time fax transmission service, selecting a specific terminal from terminals registered in the registration server, Requesting real-time fax transmission to a selected terminal, setting up a call for real-time fax transmission with a specific terminal through an IMS network, and transmitting fax data to a specific terminal in real time.

Real time fax, IMS, PSTN, mobile terminal, SIP

Description

Method of sending a realtime fax data of a mobile communication terminal using an IMS network}

1 is a diagram showing the configuration of a network to which a real-time fax transmission method of a mobile communication terminal using an IMS network according to an embodiment of the present invention is applied;

2 is a block diagram showing the configuration of a mobile communication terminal according to an embodiment of the present invention;

3 is a diagram illustrating a menu screen of a mobile communication terminal for performing a one-to-one real-time fax transmission according to an embodiment of the present invention;

4 is a diagram illustrating a message transmission procedure in which a user's mobile communication terminal registers with a registration server located in an IMS network in order to receive a real-time fax service using an IMS network.

5 is a diagram illustrating an embodiment of a message flow for performing a one-to-one real-time fax service between mobile terminals according to an embodiment of the present invention;

6 is a diagram illustrating a message flow for performing a one-to-one real-time fax service between a mobile communication terminal and a G3 fax according to another embodiment of the present invention;

7 is a diagram illustrating a menu screen of a mobile communication terminal for performing a one-to-many real-time fax service according to another embodiment of the present invention;

8 is a diagram illustrating a calling party message flow of a system for performing a one-to-many real-time fax service according to another embodiment of the present invention; and

FIG. 9 is a flowchart illustrating a process of transmitting a SIP invite message to a user terminal of a selected specific group by the fax server illustrated in FIG. 8.

Brief description of the main parts of the drawing

10: IMS network 20: 3GPP network, 3GPP2 network

30: WLAN network 40: PSTN network

200: mobile communication terminal

The present invention relates to a real-time fax transmission method of a mobile communication terminal using an IMS (IP Multimedia Subsystem) network.

In general, fax transmission is performed through a public switched telephone network (hereinafter referred to as a PSTN), but the fax service, which was recently available in an exchange using a conventional line network, is backbone over an IP (Internet Protocol) network. In the network system, MGCP (Media Gateway Control Protocol) / Megaco protocol is applied to enable the existing fax service and to provide new services such as Internet fax.

IMS network refers to a communication system that provides IP multimedia services to subscribers through an IP-based core network. The Third Generation Partnership Project (3GPP / 3 / 3GPP2) is conducting various studies to smoothly provide ALL IP services through IMS. However, a method of performing real-time fax transmission using an IMS network has not yet been implemented.

Accordingly, an object of the present invention is to provide a real-time fax transmission method and a mobile communication terminal of a mobile communication terminal using an IMS network to perform a real-time fax transmission using an IP-based IMS network.

Technical problems to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above may be clearly understood by those skilled in the art from the following description. There will be.

Real-time fax transmission method of a mobile communication terminal using an IMS network according to an embodiment of the present invention for achieving the above object comprises the steps of registering with a registration server located in the IMS network to receive a real-time fax transmission service; Selecting a specific terminal from among terminals registered in the registration server, and requesting real-time fax transmission to the selected terminal; Setting up a call for real-time fax transmission with the specific terminal through the IMS network; And transmitting fax data in real time to the specific terminal. Contains

The call setup is performed according to the SIP protocol.

The fax data is transmitted based on the T.38 protocol.

The specific terminal accesses the IMS network through a 3GPP network, a 3GPP2 network, a WLAN network, or a PSTN network.

If the specific terminal is a G3 fax machine, call setup is performed with the G3 fax machine through the IMS network and the PSTN network. When the call setup with the G3 fax machine is completed, the fax data is transmitted in real time to the IMS network based on the T.38 protocol, and the G3 fax is transmitted through the PSTN network based on the T.30 protocol in the IMS network. Send the fax data in real time to the machine.

When the number of the selected specific terminals is plural, a first fax server accessible by the mobile communication terminal as a prerequisite for performing call setup with the plurality of terminals, and a plurality of terminals accessible by the plurality of terminals. And establishing a call with the fax server. When call setup with the plurality of terminals is completed, fax data is transmitted in real time to the plurality of terminals via the first fax server and the second fax server according to the T.38 protocol.

Hereinafter, with reference to the accompanying drawings illustrating the present invention.

1 is a diagram showing the configuration of a network to which a real-time fax transmission and reception method according to an embodiment of the present invention is applied. In FIG. 1, the dotted line represents the flow of a Session Initiation Protocol (SIP) signal, and the solid line represents the flow of transmission of fax data using the T.38 protocol.

Referring to FIG. 1, a network to which a real-time fax transmission and reception method is applied includes an IMS network 10, a 3GPP network 20 or a 3GPP2 network 20, a WLAN network 30, a PSTN network 40, and the like.

The IMS network 10 refers to a communication network that provides IP multimedia services to subscribers through an IP-based core network. Since the IMS network 10 provides various types of packet data services based on the IP transport protocol, IMS users can exchange multimedia type contents such as pictures, video clips, and sound clips through session-based messages.

In the present embodiment, the IMS network 10 includes a Proxy-Call Session Control Function (P-CSCF), a Serving-Call Session Control Function (S-CSCF), a Media Gateway Control Function (MGCF), a Home Subcriber Server (HSS), MGW (Media Gateway), SGW (Signaling Gateway) and the like.

The 3GPP network 20 or the 3GGP2 network 20 is a network for providing an ALL IP service in conjunction with the IMS network 10. The wireless local area network (WLAN) network 30 interworks with the IMS network 10 and supports IEEE 802.11. The Public Switched Telephone Network (PSTN) network 40 includes a Service Switching Point (SSP) and a Signaling Transfer Point (STP).

2 is a block diagram showing the configuration of a mobile communication terminal according to an embodiment of the present invention.

Referring to FIG. 2, the mobile communication terminal 200 includes a wireless transceiver 210, a data processor 220, an audio processor 230, a memory 240, a display 250, an input unit 260, The session processor 270 and the controller 280 are included.

The wireless transceiver 210 performs a communication function of the mobile communication terminal 200. The wireless transceiver 210 includes an RF transmitter for upconverting and amplifying a frequency of a transmitted signal, and an RF receiver for low noise amplifying and downconverting a received signal.

In the present embodiment, the wireless transceiver 210 accesses the IMS network 10 and transmits various call setup messages, SIP invite messages, response messages, etc. generated by the session processor 270 to the IMS network 10. .

The data processor 220 includes a transmitter for encoding and modulating a transmitted signal and a receiver for demodulating and decoding a received signal.

The audio processor 230 plays a function of reproducing the audio signal decoded and output by the data processor 220 or transmitting the audio signal generated from the microphone MIC to the data processor 120.

The memory unit 240 includes a program memory and data memories. Programs are stored in the program memory for controlling general operations of the mobile communication terminal 200.

In the present embodiment, the memory unit 240 stores a software program for performing call setup through the IMS network 10 according to the SIP protocol, a software program for transmitting fax data in real time according to the T.38 protocol, and the like. Doing.

The display unit 250 outputs various display information, various menu screens, etc. output from the mobile communication terminal 200, and is composed of a liquid crystal display (LCD) or an organic light emitting diode (OLED).

In an embodiment of the present invention, the display unit 250 displays a fax transmission menu for performing real-time fax transmission.

The input unit 260 includes various buttons for inputting numeric and text information and function buttons for setting various functions. The input unit 260 may be implemented as a keypad including a direction key, a jog dial, a touch screen, a joystick, and the like.

In this embodiment, the input unit 260 is used to select a receiving terminal to transmit the fax, and also receives a fax transmission request from the user and transmits it to the control unit 280.

The session processor 270 processes a SIP session setup for initial registration between the mobile communication terminal 200 and the IMS network 10 as a preliminary step for performing a real-time fax transmission.

The controller 280 performs overall control of the mobile communication terminal 200.

In the present embodiment, the control unit 280, if there is a fax transmission request from the input unit 260 to a specific terminal selected by the user, so that the fax data can be transmitted in real time to the specific terminal selected by the user according to the T.38 protocol To control.

3 is a menu screen of a mobile communication terminal for performing one-to-one real-time fax transmission according to an embodiment of the present invention. In one-to-one real-time fax transmission, users can send faxes to other mobile terminals, IP fax machines or G3 fax machines.

Referring to FIG. 3A, a user first selects a "fax transmission menu" in the main menu 300 and clicks an OK button.

As a result, when the fax menu 310 shown in FIG. 3B is displayed on the display unit 250 of the mobile communication terminal 200, the user selects “1-1 fax menu” from the fax menu 310. And click the OK button.

Fig. 3C is a diagram showing an example of the "1-1 fax menu". Referring to (c) of FIG. 3, the 1-1 fax menu 320 selects a specific recipient by selecting a specific recipient to send a fax, and inputs the recipient's fax number or URI (Uniform Resource Identifier). Contains a number / URI input menu for selection.

When the user selects the recipient selection menu, as shown in Fig. 3D, the recipient list 330 currently offline and the recipient list 330 that is offline are displayed. When the user selects one recipient currently online from among the recipients on the recipient list 330, the fax image selection screen 340 shown in FIG. 3E is displayed.

On the fax image selection screen 340, the user selects a fax image to be transmitted and a fax to transmit the fax data, and requests the fax data to be transmitted to a specific recipient selected by pressing the Send button.

4 illustrates a message transmission procedure in which a mobile communication terminal of a user registers with a registration server located in an IMS network in order to receive a real-time fax service using the IMS network.

In FIG. 4, the registration server 15 may be a home subscriber server (HSS) that integrates and manages mobility management and authentication of an IP multimedia service user.

Referring to Figure 4, looks at the message transmission flow for registering in the IMS network.

The session processing unit 270 of the mobile communication terminal 200 generates a registration request message for requesting registration to the IMS network 10 under the control of the control unit 280, and then, via the wireless transceiver 210, the IMS network 10. Is transmitted to the registration server 15 located in (S410).

The registration request message includes a tag for performing a real-time fax service using the IMS network 10. A sample registration request message is shown below.

REGISTER sip: registrar.home1.net SIP / 2.0

Via: SIP / 2.0 / UDP [5555::aaa.bbb.ccc.ddd];branch=z9hG4bKnashds7

Max-Forwards: 70

P-Access-Network-Info: 3GPP-UTRAN-TDD; utran-cell-id-3gpp = 234151D0FCE11

From: <sip: user1_public1@home1.net>; tag = 4fa3

To: <sip: user1_public1@home1.net>

Contact: <sip: [5555 :: aaa.bbb.ccc.ddd]>; + g.rt.fax; expires = 60000;

Call-ID; app011zhiaaa923kljlaaa

Authorization: Digest username = "user1_private@home1.net",

realm = "registar.home1.net", nonce = "", uri = "sip: registrar.home1.net", response = ""

CSeq: 1REGISTER

Content-Length: 0

The first line of a text-encrypted message contains the method name REGISTER, and the lines below represent a list of header fields. The definition of each header field is described in detail in RFC 3261, so a description thereof will be omitted.

The registration server 15 transmits a SIP 401 "Unauthorized" message requesting user authentication and registration of the mobile communication terminal 200 to the mobile communication terminal 200 (S420).

When the mobile communication terminal 200 receives the SIP 401 "Unauthorized" message, the session processing unit 270 of the mobile communication terminal 200 uses a tag and user authentication information for performing a real-time fax service using the IMS network 10. Generates a SIP registration request message containing a and transmits to the registration server 15 through the wireless transceiver 210 (S430). A sample SIP registration request message is shown below.

REGISTER sip: registrar.home1.net SIP / 2.0

Via: SIP / 2.0 / UDP [5555 :: aaa.bbb.ccc.ddd]; branch = z9hG4bKnashef8

Max-Forwards: 70

P-Access-Network-Info: 3GPP-UTRAN-TDD; utran-cell-id-3gpp = 234151D0FCE11

From: <sip: user1_public@home1.net>; tag = 4fa3

To: <sip: user1_public@home1.net>

Contact: <sip: [5555 :: aaa.bbb.ccc.ddd]>; + g.rt.fax; expires = 60000;

Call-ID: app011zhiaaa923kljlaaa

Authorization: Digest username = "user1_private@home1.net",

realm = "registrar.home1.net", nonce = base64 (RAND + AUTN + Server specific data), algorithm = AKAv1-MD5, uri = "sip: registrar.home1.net",

response = "6629fae49393a05397450978507c4ef1"

CSeq: 2REGISTER

Content-Length: 0

The registration server 15 transmits a SIP 200 OK message to the mobile communication terminal 200 to inform that the user registration for performing a real-time fax service has been successfully completed using the IMS network 10 (S440).

As described above, since the mobile communication terminal 200 registers with the registration server 15 located in the IMS network 10 using the Session Initiation Protocol to perform a real-time fax transmission service, When registering with the IMS network 10, there is an advantage that the call setup procedure is simplified.

5 is a diagram illustrating an embodiment of a message flow for performing a one-to-one real-time fax service between mobile terminals according to an embodiment of the present invention. In FIG. 5, temporary responses are omitted for convenience of description.

Referring to FIG. 5, an initialization is requested from the mobile terminal such as the notebook computer 1 to the first mobile communication terminal 200a (S505). At this time, the notebook 1 and the first mobile communication terminal 200a are connected to each other via a wired or wireless method such as a USB cable or Bluetooth.

The first mobile communication terminal 200a sends a SIP invite message to a first proxy call session control function (hereinafter referred to as P-CSCF) 2a located in the IMS network 10. Transmitting performs a call request (S510).

The first P-CSCF 2a is a device that first connects to the IMS network 10 when the mobile communication terminal receives the IMS service. In the present embodiment, the first P-CSCF 2a uses the first P-CSCF ( 2a), and the second mobile communication terminal 200b may access the second P-CSCF 2b.

The first P-CSCF 2a forwards the SIP invite message delivered from the first mobile communication terminal 200a to the second P-CSCF 2b that the second mobile communication terminal 200b can access ( In step S515, the second P-CSCF 2b transfers the SIP invite message to the second mobile communication terminal 200b (S520).

When the second mobile communication terminal 200b receives the SIP request message of the first mobile communication terminal 200a and accepts the call request, the second mobile communication terminal 200b of the printer 50 connected in series with the second mobile communication terminal 200b. The environment is set (S525), and the SIP 200 OK message is transmitted to the second P-CSCF (2b) (S530).

The second P-CSCF 2b again routes the SIP 200 OK message to the first P-CSCF 2a (S535), and the first P-CSCF 2a sends the SIP 200 to the first mobile communication terminal 200a. Routing the OK message (S540).

When the first mobile communication terminal 200a receives the 200 OK message, the first mobile communication terminal 200a notifies the notebook 1 connected to the first mobile communication terminal 1 that the initialization is successful (S545), and sends an ACK message corresponding to the 200 OK message to the first P-CSCF ( 2a) (S550). The ACK message is transmitted from the first P-CSCF 2a to the second P-CSCF 2b in the same manner as described above (S555), and again from the second P-CSCF 2b to the second mobile communication terminal 200b. It is delivered to (S560).

As such, the SIP invite message and the response messages are exchanged between the first mobile communication terminal 200a and the second mobile communication terminal 200b via the P-CSCFs 2a and 2b located in the IMS network 10. Thereby establishing a SIP session.

The SIP message transmitted and received between the first mobile communication terminal 200a and the second mobile communication terminal 200b in the process of forming a SIP session includes a Session Description Protocol (SDP) defining media characteristics to be used for the SIP session. That is, the SIP session establishment process includes determining the media and the characteristics of the session to be used in the SIP session by using the SDP included in the SIP message.

After the SIP session establishment process is completed in this manner, if the fax data is transmitted from the mobile terminal such as the notebook 1 to the first mobile communication terminal 200a (S565), the first mobile communication terminal 200a is T. According to the 38 protocol, the second mobile communication terminal 200a performs IP based real time fax transmission (S570).

At this time, the fax data transmitted according to the T.38 protocol is transmitted in units of frames. In this case, delay or loss of data may occur, so that the data called facsimile User Datagram Protocol Transport Layer protocol (UDPTL) is prevented. Specify the structure and send it in the UDP packet.

The second mobile communication terminal 200b transmits the received fax data to the printer 50 connected to communicate therewith (S570).

FIG. 6 is a diagram illustrating a message flow for performing a one-to-one real-time fax service between a mobile communication terminal and a G3 fax machine according to another embodiment of the present invention.

Referring to FIG. 6, the IMS network 10 includes a proxy-call session control function (P-CSCF) 2, a serving-call session control function (S-CSCF) 4, and a media gateway control function (MGCF) ( 6), a Signaling Gateway (SGW) 8 and a Media Gateway (MGW) 9.

The P-CSCF 2 is a device to which the mobile communication terminal 200 first connects to the IMS network 10 as described above with reference to FIG. 5.

The S-CSCF 4 is called a serving-call session control function and manages session state of a user terminal. The S-CSCF 4 stores subscriber information of a user terminal delivered from a home subscriber server (HSS) (not shown), and performs subscriber authentication in association with the HSS (not shown).

The MGCF 6 performs functions such as call processing, routing, protocol conversion, and the like, and communicates with the MGW 9 using a protocol such as MEGACO or H.248. The MGW 9 performs functions such as protocol and address translation when user data is transferred to the PSTN network 40 which is a public telephone network.

The SGW 8 is connected to the MGCF 6 and the PSTN network 40 to convert mutual signals. In the present embodiment, the SGW 8 uses the IETF's Sigtran (SIGTRAN) protocol as the signaling translation protocol.

The Sictran protocol is a protocol for transmitting a message from the IMS network 10, which is a packet network, to the PSTN network 40, which is a circuit switching network, or for transmitting a message from the PSTN network 40, to the IMS network 10.

Looking at the message flow with reference to Figure 7, the SIP invite message is delivered from the mobile communication terminal 200 of the user to the P-CSCF (2) located in the IMS network (10) (S603).

The P-CSCF 2 transmits the SIP 100 "Trying" message, which is a response message to the SIP invite message, to the mobile communication terminal 200 (S606), and sends the SIP invite message received from the mobile communication terminal 200. Transfer to S-CSCF (4) (S609).

S-CSCF (4) transmits a SIP 100 "Trying" message, which is a response message to the received SIP invite message to the P-CSCF (2) (S612), SIP invite received from the P-CSCF (2) The message is transmitted to the MGCF 6 (S615).

The MGCF 6 transmits a SIP 100 “Trying” message, which is a response message to the SIP invite message received from the S-CSCF 4, to the S-CSCF 4 (S618).

The MGCF 6 requests resource reservation from the MGW 9 using the megaco protocol or the H.248 protocol (S621).

The MGW 9 transmits a response message for the resource reservation request of the S-CSCF 4 to the MGCF 6 using the megaco protocol or the H.248 protocol (S624).

The MGCF 6 transmits a Sictran IP_IAM (Initial Address Message) message to the SGW 8 to initialize the call setup of the PSTN network 40 (S627).

The SGW 8 transmits an ISUP (Intergrated Digital Network User Part) _IAM message to the STP / SSP 42 located in the PSTN network 40 (S630). More specifically, the SGW 8 relays the IAM message to the STP / SSP 42 using an IP-based transport protocol (EX: SCTP / UDP / IP).

The STP / SSP 42 in the PSTN network 40 transmits a call setup message (SS7) based on the Signaling System No. 7 (SS7) protocol to the G3 FAX machine 60 (S633). The G3 fax machine 60 transmits an alert message to the STP / SSP 42 in the PSTN network 40 (S636).

The STP / SSP 42 accepts a call with an Address Complete Message (ACM) and transmits an ISUP_ACM (Address Complete Message) message to the SGW 8 (S639). The SGW 8 transmits the Sictran IP_ACM message to the MGCF 6 (S642).

The MGCF 6 sends a SIP 183 "session progress" message to the S-CSCF 4 (S645), and the S-CSCF 4 sends a SIP 183 "session progress" message to the P-CSCF 2 Routing (S648), the P-CSCF (2) again routes the SIP 183 "session progress" message to the mobile communication terminal (200) (S651).

Subsequently, the G3 FAX transmits a CONNECT message to the STP / SSP 42 in the PSTN network 40 (S654). The STP / SSP 42 of the PSTN network 40 receiving the access message transmits an ISUP ANM (Answer Message) message to the SGW 8 in the IMS network 10 (S657). The SGW 8 transmits the Sictran IP_ANM message to the MGCF 6 (S660).

The MGCF 6 sends a command to the MGW 9 to modify the IP fax termination using the H.248 protocol or the Megaco protocol to establish a bidirectional IP fax path (S663), and the MGW 9 sends the MGCF. The response message is transmitted to 6 (S666).

The MGCF 6 sends a SIP 200 OK message to the S-CSCF 4 (S669), and the S-CSCF 4 routes the SIP 200 OK message to the P-CSCF 2 (S672), and P- The CSCF 2 routes the SIP 200 OK message to the mobile communication terminal 200 (S675).

The mobile communication terminal 200 transmits the SIP ACK message to the P-CSCF 2 (S678), and the P-CSCF 2 routes the SIP ACK message to the S-CSCF 4 (S681) and S- The CSCF 4 routes the SIP ACK message to the MGCF 6 (S684).

The mobile communication terminal 200 starts transmitting T.38 signals and fax data to the MGW 9 (S687), and the MGW 9 transmits the fax data to the G3 fax machine 60 using the T.30 protocol. Real time transmission (S690). The T.30 protocol is a protocol that defines the call procedure between the sending fax machine and the receiving fax machine as presented in the International Telecommunication Union-Telecommunication sector (ITU-T). In this embodiment, the fax data transmitted using the T.30 protocol is transmitted via the PSTN network 40.

7 illustrates a menu screen of a mobile communication terminal for performing a one-to-many real-time fax service according to another embodiment of the present invention.

First, when a user selects a fax transmission menu for transmitting fax data on the main menu 700 illustrated in FIG. 7A, the fax menu 710 illustrated in FIG. 7B is displayed. The fax menu 710 includes a "one-to-one fax menu" and a "group fax menu".

When the user selects the group fax menu, the user add menu 720 shown in FIG. 7C is displayed. The add user menu 720 displays a menu for entering a recipient selection menu and a number / URI / group URI.

When the user selects the recipient selection menu, the recipient list 730 connected with the user as shown in FIG. 7D is displayed. In the recipient list 730, the user selects two or more recipients to send the fax data from among the recipients currently online online.

When the recipient is selected, the fax image selection screen 740 shown in FIG. 7E is displayed. In the fax image selection screen 740, the user selects a fax image and a fax to send.

Then, by pressing the Send button, the user requests the selected recipient to send the fax data.

8 is a diagram illustrating a caller message flow of a system for performing a one-to-many real-time fax service according to another embodiment of the present invention.

Referring to FIG. 8, the user of the first mobile communication terminal 200a selects a specific facsimile and group through the input unit 260 and requests a fax transmission.

When a fax transmission is requested from the input unit 260 of the first mobile communication terminal 200a (S805), the first mobile communication terminal 200a transmits a SIP invite message to the first IMS network 10a (S810). .

The first IMS network 10a transmits the received SIP invite message to the first fax server 800a (S815). The first fax server 800a transmits a SIP 200 "OK" message, which is a response message to the SIP invite message, to the first IMS network 10a, and sends the SIP invite to another user terminal (not shown) of the selected specific group. The message is transmitted (S825).

The first IMS network 10a routes the SIP 200 "OK" message received from the first fax server 800a to the first mobile communication terminal 200a (S830), and the first mobile communication terminal 200a does so. The ACK message is sent to the first IMS network 10a, and the first IMS network 10a routes the ACK message to the first fax server 800a (S840).

When the SIP session setup between the first mobile communication terminal 200a and the first fax server 800a is completed by the above method, the first mobile communication terminal 200a uses the T.38 protocol to establish a first fax server ( 800a) transmit the fax data (S845).

FIG. 9 is a flowchart illustrating a process of transmitting a SIP invite message to a user terminal of a selected specific group by the fax server illustrated in FIG. 8.

Referring to FIG. 9, the first fax server 800a transmits a SIP invite message to the first IMS network 10a in order to transmit a SIP invite message to the user terminal 200b of the selected specific group (S905). .

The first IMS network 10a routes the SIP invite message to the second IMS network 10b (S910), and the second IMS network 10b routes the SIP invite message to the second fax server 800b. (S915).

The second fax server 800b transmits the SIP invite message to the second IMS network 10b (S920), and the second IMS network 10b sends the SIP invite message to the user terminal 200b of the selected specific group. Routing (S925).

The user terminal 200b accepts the SIP session establishment request (S930), and transmits a SIP 200 "OK" message to the second IMS network 10b (S935). After the second IMS network 10b routes the SIP 200 "OK" message to the second fax server 800b (S940), the second IMS network 10b receives the SIP 200 "OK" message again from the second fax server 800b (S945). ).

The second IMS network 10b transmits a SIP 200 "OK" message to the first IMS network 10a (S950), and the first IMS network 10a sends a SIP 200 "OK" message to the first fax server 800a. Routing in step S955).

The first fax server 800a transmits an ACK message to the first IMS network 10a (S960), and the first IMS network 10a routes the ACK message to the second IMS network 10b (S965). The second IMS network 10b again routes the ACK message to the second fax server 800b (S970).

The second fax server 800b transmits the ACK message back to the second IMS network 10b (S975), and the second IMS network 10b routes the ACK message to the user terminal 200b of the selected specific group ( S980).

As a result, the SIP session setup is completed between the first fax server 800a and the second fax server 800b, and the SIP session setup is completed between the second fax server 800b and the other user terminal 200b of the selected specific group. do.

When the SIP session setup is completed, the first fax server 800a transmits the fax data received from the first mobile communication terminal 200a to the second fax server 800b using the T.38 protocol (S985). In addition, the second fax server 800b transmits the fax data to another user terminal 200b of the specific group selected using the T.38 protocol (S990).

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described specific embodiment, and the present invention may be used in the art without departing from the gist of the present invention as claimed in the claims. Various modifications can be made by those skilled in the art, and such changes are within the scope of the claims.

As described above, according to the present invention, the user of the mobile communication terminal can transmit the fax data in real time to a specific terminal (ex: mobile communication terminal, G3 fax machine, notebook, printer) selected by the user through the IP-based IMS network. There is an advantage.

Claims (8)

Registering with a registration server located in an IP Multimedia Subsystem (IMS) network to receive a real-time fax transmission service; Selecting a specific terminal from among terminals registered in the registration server, and requesting real-time fax transmission to the selected specific terminal; Setting up a call for real-time fax transmission with the specific terminal through the IMS network; And Real-time fax transmission method of the mobile terminal using the IMS network comprising a; real-time fax data transmission to the specific terminal. The method of claim 1, Method of real-time fax transmission of a mobile communication terminal using an IMS network, characterized in that the call setup is performed according to the SIP (Session Initiation Protocol). The method of claim 1, wherein the fax data, A real-time fax transmission method of a mobile communication terminal using an IMS network, characterized in that the transmission based on the T.38 protocol. The method of claim 1, wherein the specific terminal, A real-time fax transmission method of a mobile communication terminal using an IMS network, characterized in that to access the IMS network through a 3GPP network, 3GPP2 network, WLAN network, or PSTN network. The method of claim 1, wherein when the specific terminal is a G3 fax machine, Call setup with a mobile communication terminal using an IMS network, characterized in that call setup is performed with the G3 fax machine through the IMS network and the PSTN network. The method according to claim 5, wherein when the call setup with the G3 fax machine is completed, The fax data is transmitted in real time to the IMS network based on the T.38 protocol, and the fax data is transmitted in real time to the G3 fax machine through the PSTN network based on the T.30 protocol in the IMS network. Real-time fax transmission method of mobile communication terminal using IMS network. Registering with a registration server located in an IP Multimedia Subsystem (IMS) network to receive a real-time fax transmission service; Selecting a plurality of specific terminals among the terminals registered in the registration server, and requesting real-time fax transmission to the selected plurality of specific terminals; A call setup step of setting up a call with the plurality of specific terminals to perform real-time fax transmission to the plurality of specific terminals through the IMS network; And And transmitting fax data in real time to the plurality of specific terminals. Call setting step of setting a call with the plurality of specific terminals, Setting up a call for performing a real-time fax transmission with a first fax server accessible by the mobile communication terminal; Establishing a call with a second fax server accessible by the plurality of specific terminals via the first fax server; Setting up a call with the plurality of specific terminals via the first fax server and the second fax server; and a real-time fax transmission method of a mobile communication terminal using an IMS network. The method of claim 7, wherein, when call setup with the plurality of specific terminals is completed, The real-time fax transmission method of a mobile communication terminal using an IMS network, characterized in that the fax data is transmitted in real time to the plurality of specific terminals via the first fax server and the second fax server according to the T.38 protocol.

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