KR20170039416A - Security Incoming and Outgoing Calls Using Voice over LTE Terminal And Control Method Thereof - Google Patents

Abstract

Disclosed is a voice over LTE (VoLTE) terminal transmitting a security call. The terminal according to the present invention includes a communication unit and a control unit which transmits a session initiation protocol (SIP) invite message including a specific security code to an originating network through the communication unit. The control unit receives a response message to the SIP invite message from the originating network when a call connection is completed and performs an event to notify the security call if the specific security code is included in the response message. Accordingly, the improvement of system security can be expected.

Description

TECHNICAL FIELD [0001] The present invention relates to a VoLTE terminal and a control method thereof,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a VoLTE system, and more particularly, to a VoLTE terminal for receiving and receiving a secure call and a control method thereof.

Recently, a ubiquitous society based on information and communication technology is being implemented. The wired / wireless communication network is connected globally, and various needs of individuals, companies, and countries are being solved.

Generally, a mobile communication system has been developed to provide voice service while ensuring the user's activity. However, the mobile communication system is gradually expanding not only to voice but also to data service, and now it has developed to the extent of providing high-speed data service.

In today's mobile communication system, there is a need to solve the problem of lack of resources due to the provision of various services, and there is a need to develop a more advanced mobile communication system according to the demand of a user who wants to provide a higher speed service .

As a system under development in the next generation mobile communication system in response to this demand, standard works for LTE (Long Term Evolution) are underway in the 3rd Generation Partnership Project (3GPP). LTE is a technology that implements high-speed packet-based communication with transfer rates of up to 100 Mbps. For example, there are several ways to reduce the number of nodes on the communication path by simplifying the structure of the network, or to make wireless protocols as close as possible to the wireless channel.

In addition, in the LTE network, CSFB (CS fall (CS)), which uses IMS-based VoLTE (Voice over LTE) technology in a PS (Packet Switched) scheme to support voice call or CS (Circuit Switched) scheme in a 2G / back technology. In LTE networks, VoLTE is a term that can be used with the same concept as VoIMS (Voice over IMS).

In addition, the VoLTE terminal 100 can use the security call service. FIG. 1 and FIG. 2 are views showing a problem in performing a VoLTE call in the prior art. Here, the security call means a call in which data (e.g., voice data) is encrypted so as to protect the information of the user and protect the contents of the call.

1, the VoLTE terminal 100 is a terminal for encrypting transmitted data. The VoLTE terminal 100 issues a security call. However, when the terminal 200 does not support secure call, the security reliability between the VoLTE terminal 100 and the network 300 (N / W) is guaranteed, but the security between the network 300 and the called terminal 200 Reliability is not guaranteed. That is, end-to-end security reliability is not guaranteed in the prior art.

2, even if both the calling terminal 100 and the called terminal 200 do not support security calls, security vulnerabilities may inevitably occur.

Therefore, there is a desperate need to inform the user of the security reliability.

Published Japanese Patent Application No. 10-2015-0073825 (Publication date 2015.07.01)

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a VoLTE terminal for notifying a user of security reliability.

Another object of the present invention is to provide a system for providing enhanced network security by recognizing whether or not a security call is performed between end terminals.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

The VoLTE terminal that originates a security call in various embodiments of the present invention includes a communication unit; And a control unit for transmitting a Session Initiation Protocol (SIP) INVITE message including a specific security code to the originating network via the communication unit. When the call connection is completed, the control unit transmits a response message to the SIP INVITE message When the response message includes the specific security code, an event for notifying a security call can be performed.

Here, the specific security code may be included in the header of the SIP INVITE message.

In addition, the specific security code may include P-Security-Info.

In addition, the control unit may receive a response message for the SIP INVITE message from the originating network at the time when the call connection is completed.

In addition, if the response message does not include the specific security code, the control unit may perform an event notifying that an end-to-end security call is not performed.

The VoLTE terminal may further include a display, and the control unit may display a popup or an icon related to the event on the display.

Meanwhile, a control method of a VoLTE terminal that originates a secure call includes transmitting a Session Initiation Protocol (SIP) INVITE message including a specific security code to a call originating network;

Receiving a response message for the SIP INVITE message from the originating network; And if the response message includes the specific security code, performing an event indicating that an end-to-end security call is performed.

Here, the specific security code may be included in the header of the SIP INVITE message.

In addition, the specific security code may include P-Security-Info.

In addition, if the response message does not include the specific security code, performing an event notifying that an end-point security call is not performed may be performed.

The performing of the event may include displaying a pop-up or an icon related to the event.

Meanwhile, the VoLTE terminal for receiving the secure call includes a communication unit for receiving the SIP INVITE message from the destination network; And a controller for performing an event notifying that an end-point security call is performed when the SIP INVITE message includes a specific security code.

Here, the control unit may transmit the response message to the destination network by including the specific security code in a response message to the SIP INVITE message.

In addition, the specific security code may be included in the header of the response message.

Here, the specific security code may be P-Security-Info.

The VoLTE terminal may further include a display, and the control unit may display a popup or an icon related to the event on the display.

Meanwhile, a control method of a VoLTE terminal for receiving a secure call includes: receiving a SIP INVITE message from a destination network; And performing an event notifying that an end-to-end security call is performed when a specific security code is included in the SIP INVITE message.

The method may further include transmitting the response message to the destination network by including the specific security code in a response message to the SIP INVITE message.

In addition, the specific security code may be included in the header of the response message.

In addition, the specific security code may include P-Security-Info.

In addition, the performing of the event may include displaying a pop-up or an icon related to the event.

On the other hand, a program recorded on a recording medium that realizes a control method of a VoLTE terminal that originates the security call can be started.

The recording medium on which the program is recorded may also be disclosed.

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, And can be understood and understood.

According to various embodiments of the present invention, the following effects can be obtained.

First, the objective is to improve the device security by providing a VoLTE terminal that informs the user whether security reliability is secured.

Second, it is expected that the reliability of the network system is improved by recognizing whether or not the security call is performed between the end terminals.

The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.

FIG. 1 and FIG. 2 are diagrams showing a problem in performing a VoLTE call according to the related art.
3 is a system diagram illustrating the generalization of an LTE communication system.
FIG. 4 is a block diagram of a VoLTE terminal for making and receiving secure calls according to an embodiment.
5 is a schematic flow chart of a system for receiving and transmitting security calls according to an embodiment.
6 is a flowchart illustrating a method of operating a VoLTE terminal for making and receiving a secure call according to an embodiment.
7 is a diagram illustrating an example of the SIP INVITE message of FIG.
8 and 9 are flowcharts illustrating a method of driving a VoLTE terminal for receiving and receiving a secure call according to the embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus and various methods to which embodiments of the present invention are applied will be described in detail with reference to the drawings. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role.

In the description of the embodiment, in the case of being described as being formed in the "upper or lower", "before" or "after" of each element, (Lower) "and" front or rear "encompass both that the two components are in direct contact with one another or that one or more other components are disposed between the two components.

It is also to be understood that the terms such as " comprises, "" comprising," or "having ", as used herein, mean that a component can be implanted unless specifically stated to the contrary. But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."

LTE  Generalization of Mobile Communication Systems

3 is a diagram illustrating a structure of a general LTE mobile communication system according to an embodiment.

3, the radio access network of the LTE mobile communication system includes an Evolved Node B (EUTRAN) 110, a Mobility Management Entity (MME) 120, and an S-GW (Serving Gateway) 130.

A user equipment (UE) 100 accesses an external network through an ENB 110, an S-GW 130, and a P-GW (Packet Data Network Gateway) 160.

The ENB 110 corresponds to a radio network controller (RNC) of a Universal Terrestrial Radio Access Network (UTRAN) system and a base station controller (BSC) of a GSM EDGE Radio Access Network .

The ENB 110 is connected to the UE 100 through a radio channel and plays a similar role as a conventional RNC / BSC. The ENB 110 may use several cells at the same time.

In LTE, since all user traffic including a real-time service such as Voice over IP (VoIP) using an internet protocol is serviced through a shared channel, a device for collecting and scheduling situation information of UEs 100 is required This is handled by the ENB 110.

The MME 120 is an apparatus that performs various control functions, and one MME 120 can be connected to a plurality of base stations 110.

The S-GW 130 is a device that provides a data bearer and generates or removes a data bearer under the control of the MME 120. [

An application function (AF) 140 is a device that exchanges information related to a user and an application at an application level. The AF 140 may be, for example, an SCC AS (Service Centralization and Continuity Application Server) for supporting a voice service through a packet network. The SCC AS can perform a function of notifying the paging-enabled domain of a terminal through a Terminating Access Domain Selection (T-ADS).

A Policy Charging and Rules Function (PCRF) 150 is a device for controlling a policy related to a quality of service (QoS) of a user and includes a Policy and Charging Control (PCC) GW 160, and is applied. The Policy Charging and Rules Function (PCRF) 150 is an entity that collectively controls QoS and billing for traffic.

Generally, the UP refers to the UE 100 in which user data is transmitted and received, the ENB 110 as a RAN node, the ENB 110 and the S-GW 130 as RAN nodes, and the P- GW 160. In this case, A part of the path using a radio channel with a limited resource limitation is a path between the UE 100 and the ENB 110 serving as a RAN node.

In a wireless communication system such as LTE, the unit that can apply QoS is an evolved packet system (EPS) bearer. An EPS bearer is used to transmit IP flows with the same QoS requirements.

A QoS related parameter may be assigned to the EPS bearer, which includes a QoS Class Identifier (QCI) and an Allocation and Retention Priority (ARP). The QCI is a parameter defining QoS priority as an integer value, and the ARP is a parameter used to determine whether to permit or reject generation of a new EPS bearer.

The EPS bearer corresponds to a Packet Data Protocol (PDP) context of a General Packet Radio Service (GPRS) system. One EPS bearer belongs to a PDN connection, and a PDN connection can have an APN (Access Point Name) as an attribute. If a PDN connection is created for an IMS (IP Multimedia Subsystem) service such as Voice over LTE (VoLTE), the PDN connection must be created using a well-known IMS APN.

In various embodiments, the mobile communication network may be configured such that the LTE system and the legacy system coexist. That is, some network operators of the mobile communication system can install emergency call services or VoLTE-supported networks together with emergency call services or VoLTE-unsupported networks when constructing the network. More specifically, based on Voice over LTE (VoLTE), a kind of voice service, a mobile communication network allows use of an emergency call service or VoLTE service in a certain area (TA, Tracking Area) May be configured to allow Circuit Switched (CS) emergency or CS voice calls using a legacy network instead of allowing emergency call services or VoLTE services. VoLTE is a method of providing voice service using a packet switched (PS) network and an IMS network.

Here, the availability of the emergency call service or VoLTE may be different depending on the network configuration area, for example, the cell or the base station in a small unit, and the larger unit may be different depending on the TA (Tracking Area) or the MME pool area .

The core network node, in particular, the MME, identifies that an emergency call service is available or an IMS-based voice service when the user terminal performs location registration (attach or TAU (Tracking Area Update)) process in the emergency call service or VoLTE support area And provides the terminal with an identifier that it is available. Conversely, when the user terminal performs location registration in the emergency call service or VoLTE non-service area, the core network node provides the terminal with an identifier indicating that the emergency call service is unavailable or an identifier indicating that the IMS-based voice service is unavailable. In this network configuration, when an actual user terminal moves between two areas, the domain providing the voice service (PS for VoLTE and CS for the remaining area) can be changed. In the case of a terminal registered in the IMS, the I-CSCF / S-CSCF requests to the T-ADS in which domain (PS or CS) to perform paging for a voice call in a procedure of processing a voice call request to the terminal do. CSCF / S-CSCF informs the I-CSCF / S-CSCF of the domain for processing the voice call by referring to the result obtained from the entities of the network by the T-ADS, . ≪ / RTI >

4 is a block diagram of a VoLTE terminal according to an embodiment.

4, the VoLTE terminal 100 may include a communication unit 110, a memory 120, a display 130, and a controller 140.

Here, the VoLTE terminal 100 may be a cellular phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), a navigation device, a slate PC, A tablet PC, an ultrabook, a wearable device (e.g., a smartwatch, a glass glass, a head mounted display (HMD), etc.) .

The communication unit 110 may include not only an LTE mobile communication module but also a module for performing communication such as Wi-Fi, Bluetooth, and NFC (Near Field Communication).

The memory 120 may store network information. The memory 120 may be a flash memory type, a hard disk type, a solid state disk type, an SDD type (Silicon Disk Drive type), a multimedia card micro type ), Card type memory (e.g., SD or XD memory), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read memory, a programmable read-only memory (PROM), a magnetic memory, a magnetic disk, and / or an optical disk. The terminal 100 may operate in association with a web storage that performs a storage function of the memory 120 on the Internet.

The display 130 displays (outputs) the information processed in the VoLTE terminal 100. [ For example, the display 130 may display execution screen information of an application program driven by the VoLTE terminal 100, or UI (User Interface) and GUI (Graphic User Interface) information according to the execution screen information.

The display 130 may be a liquid crystal display (LCD), a thin film transistor-liquid crystal display (TFT LCD), an organic light-emitting diode (OLED), a flexible display ), A three-dimensional display (3D display), and an electronic ink display (e-ink display).

Also, there may be more than one display 130 depending on the implementation of the VoLTE terminal 100. In this case, in the VoLTE terminal 100, a plurality of displays may be spaced apart from one another, disposed integrally, or disposed on different surfaces.

The display 130 may include a touch sensor that senses a touch on the display 130 so that a control command can be received by a touch method. When the display 130 is touched, the touch sensor senses the touch, and the control unit 140 generates a control command corresponding to the touch based on the touch. The content input by the touch method may be a letter or a number, an instruction in various modes, a menu item which can be designated, and the like.

The control unit 140 is a module that controls components of the VoLTE terminal 100 as a whole.

Hereinafter, a VoLTE terminal that originates a secure call will be schematically described with reference to FIG. Here, FIG. 4 will be referred to together.

The control unit 140 transmits a Session Initiation Protocol (SIP) INVITE message including the specific security code to the network 300 (S410).

The control unit 140 may transmit the specific security code to the network 300 by including it in the header of the INVITE message.

Next, the network 300 transmits a SIP INVITE message to the VoLTE receiving terminal 200 (S420).

Then, the VoLTE receiving terminal 200 transmits 180 commands to the network 300 (S430). The 180 command corresponds to the Ringing command.

The network 300 transmits the 180 command as it is to the VoLTE calling terminal 100 (S440).

Next, when a 200 command (connection OK command) reaches the VoLTE calling terminal 100 (S450, S460), the VoLTE calling terminal 100 transmits an ACK command to the VoLTE terminal 200 (S470, S480) .

Then, the communication connection between the VoLTE calling terminal 100 and the VoLTE receiving terminal 200 is completed.

In this case, the VoLTE calling terminal 100 and the VoLTE receiving terminal 200 may receive a notification message indicating whether or not the security call is performed before a call connection, and generate a corresponding event.

The VoLTE calling terminal 100 can determine that a security call between the end terminals 100 and 200 is performed when a response message to the SIP INVITE (200 command) includes a specific security code, (200 command) does not include a specific security code, it can be determined that a security call between the end terminals 100 and 200 is not performed.

At this time, the VoLTE calling terminal 100 can display whether or not the security call is performed to the user. For example, the VoLTE calling terminal 100 may provide a notification indication to the user via the display 130, but the present invention is not limited thereto.

Hereinafter, a method of driving a VoLTE terminal for making and receiving a secure call will be described with reference to FIGS. 6 to 9. FIG.

6, it is assumed that the secure VoLTE terminal 100 is set as a calling terminal and the general VoLTE terminal 200 is set as a called terminal. Generally, a reliable security is provided between the origination network 500 and the destination network 600 by a closed network and a dedicated line. Also, relatively weak security between the secure VoLTE terminal 100 and the originating network 500 and between the terminating network 600 and the normal VoLTE terminal 200 can be provided.

First, the secure VoLTE terminal 100 transmits an INVITE message to the originating network 500 (S610).

The INVITE message will be described with reference to FIG.

The INVITE message may be composed of a SIP header and an SIP body. The SIP body may include a Session Description Protocol (SDP) message, which may include a session name, a time at which the session is activated, media and media information within the session, bandwidth information, contact information of the responsible person, and so on. The SDP message may include an m field, an a field, an inline field, and the like.

For example, the m field may include media name, type, format, transport, address, and the like. The transport can be represented by RTP / AVP (Audio Video Profile). The a field can display the attribute information of the session. In particular, the password may be marked as AES generated. The inline indicates the key. The secure VoLTE terminal 100 may generate the key before sending the SIP message to the originating network 500. The secure VoLTE terminal 100 and the originating network 500 can encrypt / decrypt the voice data using the key.

In addition, the SIP header may include a specific security code.

Returning to FIG. 6, the originating network 500 may bypass the SIP header (S615).

The originating network 500 may again send the SIP message to the terminating network 600. At this time, SAVP in the m field may be set to AVP. And the called terminal is a general VoLTE terminal 200. [ Also, the a field and key information (less than inline) may be excluded from the SIP message.

The destination network 600 transmits the INVITE message to the general VoLTE terminal 200 (S620). At this time, the specific security code is excluded from the SIP header and transmitted.

In this case, the general VoLTE terminal 200 can determine that the security call is not performed because the specific security code is not included in the SIP INVITE message, and can generate a notification event to the general VoLTE terminal 200 user. For example, the general VoLTE terminal 200 may pop up or display an icon. In addition to a pop-up or an icon, any notification that can notify the occurrence of the event can be used without limitation.

The general VoLTE terminal 200 transmits a response message excluding the specific security code to the destination network 600 in operation S625 and transmits the response message excluding the specific security code to the originating network 600 (S630).

The originating network 500 transmits a response message including a header excluding the specific security code to the secure VoLTE terminal 100 to the secure VoLTE terminal 100 (S635). The a field (AES encrypted attribute) and the inline attribute (defined key information) may be included in the response message.

As a result, since the security VoLTE terminal 100 does not include the specific security code in the response message, it can recognize before the call that the security call between the end terminals 100 and 200 has not been performed.

Here, the key may be generated by the secure VoLTE terminal 100 before step S610, and the originating network 500 may store the key before step S620.

FIG. 8 is a diagram illustrating a situation in which the secure VoLTE terminal 100 is a source, and the secure VoLTE terminal 200 is set as a destination.

First, the secure call origination VoLTE terminal 100 transmits an INVITE message to the originating network 500 (S610). Here, it is the same as that shown in Fig. 7, and will not be described here.

However, the new header may include a specific security code including P-Security-Info.

The originating network 500 transmits a SIP INVITE message including the specific security code to the destination network 600 (S820).

The destination network 600 transmits a SIP INVITE message to the secure call incoming VoLTE terminal 200.

Since the secure call incoming VoLTE terminal 200 has a new header, it recognizes that the security call between the end terminals is performed and informs the user in various ways. For example, the secure call incoming VoLTE terminal 200 may inform the user of a pop-up or icon via a display, but the invention is not limited thereto. In addition to a pop-up or an icon, any notification that can notify the occurrence of the event can be used without limitation.

The secure call incoming VoLTE terminal 200 transmits a response message to the SIP INVITE including the specific security code to the secure call originating VoLTE terminal 100 through the destination network 600 and the originating network 500 (S850, S860 , S870).

As a result, the secure call origination VoLTE terminal 100 encrypts and decrypts the data to the key A between the originating networks 500. In addition, the secure call incoming VoLTE terminal 200 encrypts and decrypts data in the destination network 600 with a key B.

In addition, the secure call origination VoLTE terminal 100 and the secure call incoming VoLTE terminal 200 can generate an event by confirming presence / absence of security call.

Here, the key may be generated in the secure call originating VoLTE terminal 100 before the step S810, and the key A may be stored in the originating network before the step S820. In addition, the destination network may generate Key B before S830, and the secure call incoming VoLTE terminal 200 may store Key B.

FIG. 9 shows that the general VoLTE terminal 100 is the source, and the secure VoLTE terminal 200 is assumed to be set as the destination.

First, the general call origination VoLTE terminal 100 transmits an INVITE message to the originating network 500 (S610). Here, the aV field and the inline field are not included in the INVITE message. Also, the INVITE message does not include a header containing a specific security code.

The security VoLTE terminal 200 recognizes that the security call is not performed because the header including the specific security code is not included in the SIP INVITE message, and can notify the user.

The remaining contents can be deduced from the above description with reference to FIGS. 6 to 8, and will not be described here.

The method according to the above embodiments may be embodied as a program to be executed in a computer, and the program may be stored in a computer-readable recording medium. Examples of the computer- CD-ROMs, magnetic tapes, floppy disks, optical data storage devices, and the like, as well as carrier waves (e.g., transmission over the Internet).

The computer readable recording medium may be distributed over a networked computer system so that computer readable code can be stored and executed in a distributed manner. And, functional program, code, and code segments for implementing the above-described method can be easily inferred by programmers in the technical field to which the embodiment belongs.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

100: Outgoing VoLTE terminal
200: Incoming VoLTE terminal
500: Outgoing network
600: Destination network

Claims (23)

In a VoLTE terminal for originating a security call,
A communication unit; And
And a controller for transmitting a Session Initiation Protocol (SIP) INVITE message including a specific security code to the calling network through the communication unit,
Wherein,
Receiving a response message for the SIP INVITE message from the originating network and performing an event notifying a security call when the response message includes the specific security code. The method according to claim 1,
The specific security code includes:
A VoLTE terminal that originates a secure call and is included in the header of the SIP INVITE message. 3. The method of claim 2,
Wherein the specific security code includes P-Security-Info. The method according to claim 1,
Wherein,
And performs an event notifying that an end-to-end security call is not performed when the response message does not include the specific security code. The method according to claim 1,
Further comprising a display,
Wherein,
And displaying a pop-up or icon associated with the event on the display. A control method of a VoLTE terminal for originating a security call,
Transmitting a Session Initiation Protocol (SIP) INVITE message including a specific security code to an originating network;
Receiving a response message for the SIP INVITE message from the originating network;
And if the response message includes the specific security code, performing an event notifying that an end-to-end security call is to be performed. The method according to claim 6,
The specific security code includes:
Wherein the SIP INVITE message is included in a header of the SIP INVITE message. 8. The method of claim 7,
Wherein the specific security code includes P-Security-Info. The method according to claim 6,
And if the response message does not include the specific security code, performing an event indicating that an end-point security call is not performed. The method according to claim 6,
The step of performing the event comprises:
And displaying a pop-up or icon associated with the event. In a VoLTE terminal for receiving a secure call,
A communication unit for receiving a SIP INVITE message from a destination network; And
And a controller for performing an event notifying that end-to-end security call is performed when the SIP INVITE message includes a specific security code. 12. The method of claim 11,
Wherein,
And transmits the response message to the destination network by including the specific security code in a response message to the SIP INVITE message. 12. The method of claim 11,
The specific security code includes:
A VoLTE terminal for receiving a secure call included in a header of the response message. 14. The method of claim 13,
And the specific security code is P-Security-Info. 12. The method of claim 11,
Further comprising a display,
Wherein,
And displaying a pop-up or icon associated with the event on the display. A control method of a VoLTE terminal for receiving a secure call,
Receiving a SIP INVITE message from a destination network; And
And performing an event notifying that an end-to-end security call is performed when the SIP INVITE message includes a specific security code. 17. The method of claim 16,
And transmitting the response message to the destination network by including the specific security code in a response message to the SIP INVITE message. 17. The method of claim 16,
The specific security code includes:
Wherein the VoLTE terminal is included in the header of the response message. 19. The method of claim 18,
Wherein the specific security code includes P-Security-Info. 17. The method of claim 16,
The step of performing the event comprises:
And displaying a pop-up or icon associated with the event. A program recorded on a recording medium for realizing a control method of a VoLTE terminal that originates the security call described in claim 6. A recording medium on which the program according to claim 21 is recorded. The method according to claim 1,
Wherein,
And a response message to the SIP INVITE message is received from the originating network at the time when the call connection is completed.

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