KR20090068789A - Method for providing a emergency call service and apparatus for the same - Google Patents

Method for providing a emergency call service and apparatus for the same Download PDF

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Publication number
KR20090068789A
KR20090068789A KR1020070136548A KR20070136548A KR20090068789A KR 20090068789 A KR20090068789 A KR 20090068789A KR 1020070136548 A KR1020070136548 A KR 1020070136548A KR 20070136548 A KR20070136548 A KR 20070136548A KR 20090068789 A KR20090068789 A KR 20090068789A
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KR
South Korea
Prior art keywords
terminal
call
service
emergency call
state
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KR1020070136548A
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Korean (ko)
Inventor
황진호
Original Assignee
주식회사 케이티프리텔
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Priority to KR1020070136548A priority Critical patent/KR20090068789A/en
Publication of KR20090068789A publication Critical patent/KR20090068789A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/42017—Customized ring-back tones

Abstract

An emergency call service providing method and an apparatus for the same are provided to transmit a call to a destination terminal even when the destination terminal is not activated for a correspondent service. An interface unit(710) receives a request signal that requests a call between an originating terminal and a destination terminal, and a determining unit(750) judges an emergency call service availability state. A controller(720) transmits a paging signal to the destination terminal through an interface, and transmits a ring-back tone to the originating terminal.

Description

Method for providing an emergency call service and apparatus therefor {Method for providing a emergency call service and apparatus for the same}

The present invention relates to an emergency call service, and more particularly, even when the called terminal cannot use the call waiting service, it is similar to the case where the called terminal can use the call waiting service according to whether the calling terminal can use the emergency call service. An emergency call service method capable of performing a call processing operation and an apparatus therefor.

With the development of mobile communication technology, mobile subscribers can use various additional services in addition to basic phone call service. A coloring service, a caller ID service, a data service, and the like are examples of additional services.

One of these additional services, a call waiting service, is a service that notifies a mobile terminal in a call that another mobile terminal is trying to make a call. The user of the mobile terminal receiving the notification may wait for an existing call and then answer a new call or reject or ignore a new call attempt.

However, the existing call waiting service has only been provided depending on whether the called terminal can use the call waiting service. That is, even if the user of the terminating terminal is not subscribed to the call waiting service or if the service is deactivated even if the subscriber is subscribed to the call waiting service, even if the call is made by the user of the calling terminal for urgent business, it is not delivered to the terminating terminal. .

It is an object of the present invention to ensure that an outgoing call of a calling terminal is delivered to a called terminal according to whether an emergency call service of the calling terminal is available even when the called terminal cannot use a call waiting service.

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

In order to achieve the above object, the method for providing an emergency call service according to an embodiment of the present invention comprises the steps of: receiving a call request message requesting a call between a calling terminal and a called terminal, determining whether the called terminal is in a call waiting service unavailable state; Step, when the called terminal is busy in a call waiting service unavailable state, determining whether the calling terminal is in an emergency call service available state, and if the calling terminal is in an emergency call service available state, a paging signal is provided to the called terminal. Transmitting and transmitting a ring back tone to the calling terminal.

In order to achieve the above object, the interface unit for receiving a request signal for requesting a call between the calling terminal and the called terminal, a first determination unit for determining whether the called terminal is in a call waiting service unavailable state, the called terminal is not available for call price service A second determination unit determining whether the calling terminal is in an emergency call service available state when the call is in a state; And a control unit for transmitting a paging signal to the called terminal through the interface unit and transmitting a ring back tone to the calling terminal when the calling terminal is in an emergency call service available state.

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

According to the emergency call service providing method and apparatus therefor according to the present invention as described above, even if the called terminal does not subscribe to the call waiting service or the called terminal subscribes to the call waiting service but the corresponding service is inactivated. The call can be delivered to the terminal.

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

1 is a diagram illustrating a mobile communication system 100 according to an embodiment of the present invention. The mobile communication system 100 may be based on Code Division Multiple Access (CDMA), Wideband CDMA (WCDMA), or Global System for Mobile Telecommunication (GSM). However, the present invention is not limited thereto, and the mobile communication system 100 may be based on another type of mobile communication scheme.

The mobile communication system 100 includes a base station transceiver subsystem (BTS, 110), a base station controller (BSC, 120), a mobile switching center (MSC, 130), and a home location register (Home Location Register). Register: HLR, 140). 1 illustrates one mobile communication support apparatus 110 to 140 constituting the mobile communication system 100, this is only a schematic configuration of the mobile communication system 100, and thus the present invention is limited thereto. It is not. Therefore, the mobile communication system 100 may include a plurality of mobile communication support devices 110 to 140. For example, base station controller 120 may manage a plurality of base stations, and mobile exchange 130 may manage a plurality of base station controllers. In addition, the home location register 140 may exchange information with a plurality of mobile exchanges. In addition, the mobile communication system 100 may further include a known mobile communication support device (not shown).

The base station 110 is a primary access point of the mobile terminal 10, and transmits a radio frequency signal received from the mobile terminal 10 to the base station controller 120, and transmits a signal received from the base station controller 120 to a radio frequency signal. It can be converted to and sent to the mobile terminal 10. That is, the base station 110 may perform a wireless modem function consisting of an antenna and a transmission / reception modem.

The base station controller 120 may control the base station 110 and manage radio resources. More specifically, the base station controller 120 may instruct the base station 110 to allocate a communication channel to the mobile terminal 10 and control the transmission output of the base station 110. In addition, the base station controller 120 may support handover for the mobile terminal 10 moving between base stations.

The mobile exchange 130 may be connected to one or more base station controllers to relay communication between the mobile terminal 10 and another mobile terminal (not shown). Mobile exchange 130 may also include a Visitor Location Register (VLR, not shown) that stores information needed to process a call from a mobile terminal. Of course, the present invention is not limited thereto, and the visitor location register may also exist as a device independent from the mobile exchange 130. In addition, the mobile exchange 130 may support an emergency call service according to an embodiment of the present invention.

The home location register 140 may manage various subscriber information such as location information of the subscriber (for example, the address of the visitor location register where the mobile terminal is currently located or the address of the mobile switch) and the subscriber profile. Among these, the subscriber profile may include information about additional services to be provided to the subscriber. In addition, the home location register 140 may include an AuC (Authentication Center, not shown) that supports the authentication of the subscriber and the encryption function for the wireless call interval. Of course, the AuC may exist as a separate device from the home location register 140.

The subscriber profile managed by the home location register 140 may be provided to the mobile switch 130 that manages the base station 110 to which the mobile terminal 10 is wirelessly connected, an example of which is illustrated in FIG. 2. . For reference, since the base station 110 serves to relay a signal or a message between the mobile terminal 10 and the base station controller 120, in the present embodiment and the following embodiments for the convenience of description, The description of the operation process is omitted.

When the mobile terminal 10 requests location registration (S210), the base station controller 120 may transmit a location registration request message to the mobile switch 130 to request location registration of the mobile terminal 10 (S220). As an example of the location registration request message, an IS-634-based connection management service request message may be used.

Thereafter, the mobile exchange 130 may transmit a registration notification invoke (REGNOT INVOKE) to the home location register 140 (S230). The registration initiation message may include a subscriber identifier of the mobile terminal 10 and an identifier of the mobile exchange 130.

Receiving the registration start message, the home location register 140 updates the location information of the mobile terminal 10 (S240) and registers a response message including a subscriber profile of a user (subscriber) of the mobile terminal 10 (regnot RETURN). RESULT) may be transmitted to the mobile exchange 130 (S250).

When the registration response message is received, the mobile exchange 130 may extract the subscriber profile from the registration response message and store it (S260). More specifically, the subscriber profile may be stored in a visitor location register (not shown). However, since the visited location register may be included in the mobile switch 130, in the present specification, the mobile switch 130 may store the subscriber profile by transferring the subscriber profile to the visited location register.

Thereafter, the mobile exchange 130 transmits a registration completion message (Registration Accept) indicating that the location registration is completed to the base station controller 120 (S270), and the base station controller 120 may transmit it to the mobile terminal 10. There is (S280).

2 merely illustrates a location registration process of the mobile terminal 10, the present invention is not limited thereto, and specific additional processes for location registration may further exist. For example, a process of authenticating the subscriber of the mobile terminal 10 may be added.

Meanwhile, in step S260, the subscriber profile stored by the mobile switch 130 may include emergency call service information. The emergency call service information according to an embodiment of the present invention may be divided into available state information indicating a state in which the mobile terminal 10 can use the emergency call service, and unavailable state information indicating a state in which the emergency call service cannot be used. have. Here, the available state may mean a state in which a user (subscriber) of the mobile terminal 10 subscribes to an emergency call service and activates an emergency call service. In addition, the unused state may mean that the subscriber has not subscribed to the emergency call service or the subscriber has subscribed to the emergency call service but has disabled the emergency call service.

According to an embodiment of the present invention, the emergency call service information may be set as a mobile application part (MAP) parameter, an example of which is illustrated in FIG. 3.

3 is a diagram illustrating a Calling Feature Indicator 2 (CFI2) of the MAP parameter according to an embodiment of the present invention. Among the information set in the illustrated CFI2 300, a CW Emergencty Terminating (CET) field 310 indicates emergency call service information. The CET field 310 may have the meaning as shown in Table 1 according to the set bit value.

Table 1

H G Value Meaning 0 0 0 Not used 0 1 One Not Authorized 1 0 2 Authorized but de-activated 1 1 3 Authorized and activated

In Table 1, when the “HG” bit value is “00”, it means that the mobile communication system 100 does not support the emergency call service defined in the present invention, and all other bit values are determined by the mobile communication system 100. It means the case of supporting emergency call service. Among the remaining bit values, when the “HG” bit value is “01”, it indicates that the subscriber is not subscribed to the emergency call service. When the “HG” bit value is “10”, the subscriber subscribes to the emergency call service. However, it indicates that the emergency call service function is disabled. In addition, when the “HG” bit value is “11”, it indicates that the subscriber has subscribed to the emergency call service and the corresponding function is activated. Information shown through FIG. 3 and Table 1 is only for explaining an embodiment of the present invention, the present invention is not limited thereto.

Meanwhile, in step S260 of FIG. 2, the subscriber profile stored by the mobile exchange 130 may include call waiting service information. Similar to emergency call service information, call waiting service information may be divided into call waiting service available state and call waiting service unavailable state. The call waiting service available state may refer to a state in which a subscriber subscribes to call waiting service and activates call waiting service. In addition, the call waiting service unavailable state may mean that the subscriber does not subscribe to the call waiting service or the subscriber subscribes to the call waiting service but deactivates the call waiting service.

4 is a flowchart illustrating a process of providing an emergency call service according to an embodiment of the present invention.

First, when a mobile terminal (hereinafter referred to as an originating terminal) transmits a call requesting a call with another mobile terminal (hereinafter referred to as a called terminal), the base station controller 120 may transmit a call request message to the mobile exchange 130. . The call request message may include a communication number of the calling terminal and a communication number of the called terminal.

When the call request message is received (S410), the mobile exchange 130 may check whether the destination terminal is located within its own jurisdiction through the visited location register (S415).

As a result of the check, if the called terminal is located within its own jurisdiction, the mobile switch 130 may check whether the called terminal is in a call state with another mobile terminal (S420).

If the called terminal is not in a call state, the mobile exchange 130 transmits a paging signal indicating that the call request message has been received to the called terminal and transmits a ring back tone (RBT) to the calling terminal. It may be (S435).

However, if the destination terminal is in a call state as a result of the check in step S420, the mobile switch 130 retrieves call waiting service information from the subscriber profile of the called terminal user obtained from the home location register 140, and retrieves the retrieved call waiting service information. It can be determined whether the called terminal is in a call waiting service available state (S425).

When the called terminal is in a call waiting service enabled state, the mobile switch 130 may provide a call waiting service regardless of emergency call service information of the calling terminal. In order to provide a call waiting service, the mobile switch 130 may transmit a paging signal indicating that a call request message has been received to the called terminal in a call, and transmit a ringback tone to the calling terminal (S435).

On the other hand, when the called terminal is not in the call waiting service available state as a result of the determination in step S425, that is, when the called terminal is in the call waiting service unavailable state, the mobile switch 130 is the calling terminal user obtained from the home location register 140. The emergency call service information may be retrieved from the subscriber profile of the mobile station, and it may be determined whether the calling terminal is in an emergency call service available state by using the retrieved emergency call service information (S430).

If the calling terminal is in an emergency call service available state (for example, when the HG bit is '11' in the embodiment of Table 1), the mobile switch 130 may provide an emergency call service. That is, the mobile switch 130 may transmit a paging signal to the called terminal in a call and transmit a ringback tone to the calling terminal (S435). Accordingly, even when the called terminal is in the call waiting service unavailable state, the call processing operation may be performed similarly to the case where the called terminal is in the call waiting service available state. That is, the user of the called terminal can know that the call request is transmitted from the calling terminal even in a busy state. Depending on the choice of the called terminal user, the called terminal may ignore the call request of the calling terminal or wait for an existing call and perform a call with the calling terminal.

If the originating terminal is not in an emergency call service available state as a result of the determination in step S430, that is, the originating terminal is in an emergency call service unavailable state (for example, in the embodiment of Table 1, the bit 'HG' is set to '01'). Or ＇10)), the mobile exchange 130 may transmit a busy tone to the calling terminal (S440). In this case, the mobile exchange 130 does not transmit a paging signal to the called terminal.

On the other hand, if it is determined in step S415 that the terminating terminal is not located within the jurisdiction of the mobile switching unit 130, the mobile switching unit 130 may obtain the location information of the terminating terminal through the home location register 140 (S445). ).

The mobile switch 130, which has obtained the location information of the called terminal, may transmit a call request message to another mobile switch having jurisdiction over the corresponding location (S450). The call request message transmitted in step S450 is not the same as the call request message received in step S410. According to an embodiment of the present invention, the call request message may include emergency call service information of the calling terminal. Preferably, an initial address message (IAM) may be used as the call request message transmitted in step S450, and emergency call service information of the originating terminal may be set through a user to user information (UUI) parameter in the IAM. Can be.

5 is a diagram illustrating a UUI parameter 500 according to an embodiment of the present invention. UUI parameter 500 includes User to User Information field 510, UUI Length field 520, Protocol Identifier field 530, Protocol Identifier Length field 540, Subscriber Type field 550, and Call Feature Information ( Call Feature Information) fields 560 and 570. In this embodiment, the emergency call service information is set in the call feature information 2 field 570.

The call feature information 2 field 570 may include a CET field 571 and a spare field 572. As shown in FIG. 5, the CET field 571 may be set to two bits, and the CET field 571 may have a meaning as shown in Table 2 according to the set bit value.

[Table 2]

CET field Value Meaning 0 0 0 ignore 0 1 One CET inactive. 1 0 2 CET active 1 1 3 reserved

In Table 2, when the CET field 571 is set to '00', it may represent that the CET field 571 is not used. That is, when an initial address message including a UUI parameter in which the CET field 571 is set to '00' is received, the mobile exchange may ignore the CET field 571 and use the information of the initial address message. In addition, when the CET field 571 is set to '01', it may indicate that the calling terminal is in an emergency call service unavailable state. That is, even if the calling terminal does not subscribe to the emergency call service (for example, when the HG bit value is '01' in the embodiment of Table 1), or if the calling terminal subscribes to the emergency call service, the emergency call service is deactivated. In this case (for example, when the HG bit value is # 10 'in the embodiment of Table 1), the CET field 571 may be set to' 01 '. In addition, when the CET field 571 is set to '10', it indicates that the calling terminal is in an emergency call service available state (for example, when the HG bit value is '11' in the embodiment of Table 1). The mobile exchange receiving the initial address message including such information may provide an emergency call service according to an embodiment of the present invention. Meanwhile, in Table 2, the bit value # 11 \ that can be set in the CET field 571 is a reserved bit value. Information shown through FIG. 5 and Table 2 is only for explaining an embodiment of the present invention, the present invention is not limited thereto.

6 is a flowchart illustrating a process of providing an emergency call service according to an embodiment of the present invention. In this embodiment, another mobile exchange (hereinafter referred to as a destination side mobile exchange) that receives a call request message (initial address message) transmitted by the mobile switch 130 (hereinafter referred to as calling mobile switch) performing the processes of FIG. Operation process).

When the call request message transmitted from the calling mobile switch is received (S610), the receiving mobile switch can check whether the called terminal is in a call state with another mobile terminal (S620).

If the called terminal is not in a call state, the called-side mobile exchange may transmit a paging signal indicating that the call request message has been received to the called terminal, and transmit a ring back tone (RBT) to the calling terminal. There is (S650).

However, if the called terminal is in a call state as a result of checking in step S620, the called mobile switch exchanges the call waiting service information from the subscriber profile of the called terminal user acquired from the home location register 140 in advance through the process shown in FIG. 2. The search and call waiting service information may be used to determine whether the called terminal is in a call waiting service available state (S630).

When the called terminal is in the call waiting service available state, the called-party mobile exchange may provide the call waiting service regardless of the emergency call service information of the calling terminal. In order to provide a call waiting service, the called party mobile exchange may transmit a paging signal to the called terminal in a call and transmit a ringback tone to the calling terminal (S650). Of course, the ringback tone can be delivered to the calling terminal via the calling mobile switch.

On the other hand, when the called terminal is not in the call waiting service available state as a result of the determination in step S630, that is, when the called terminal is in the call waiting service unavailable state, the called party mobile exchange may determine whether the calling terminal is in the emergency call service available state. There is (S640). Emergency call service information of the originating terminal may be obtained from the call request message received in step S610. For example, if the information described with reference to FIGS. 5 and 2 is used, when the CET field 571 is set to '01', the called mobile switcher may determine that the calling terminal is in an emergency call service disabled state. If the CET field 571 is set to '10', the called-side mobile exchange may determine that the calling terminal is in an emergency call service available state.

If the calling terminal is in an emergency call service available state, the called-party mobile exchange may provide an emergency call service. That is, the called party mobile exchange may transmit a paging signal to the called terminal in a call and transmit a ringback tone to the calling terminal (S650). Accordingly, even when the called terminal is in the call waiting service unavailable state, the call processing operation may be performed similarly to the case where the called terminal is in the call waiting service available state.

If the originating terminal is not in an emergency call service enabled state, that is, when the originating terminal is in an emergency call service disabled state, the called party mobile exchange may transmit a busy tone to the calling terminal. There is (S660). The busy tone can also be delivered to the calling terminal via the calling mobile exchange. At this time, the called-side mobile exchange does not transmit a paging signal to the called terminal.

7 is a block diagram illustrating a mobile exchange 700 according to an embodiment of the present invention. Both the mobile exchange 130 performing the process of FIG. 4 and the destination mobile exchange performing the process of FIG. 6 may include the configuration of the mobile exchange 700 shown in FIG. 7.

The mobile switch 700 may include an interface 710, a controller 720, a message processor 730, a visitor location register 740, and a determiner 750. Although the visitor location register 740 is shown in FIG. 7 as being included in the mobile exchange 700, this is merely exemplary and the present invention is not limited thereto. As mentioned above, the visitor location register 740 may exist as a separate device separate from the mobile exchange 700.

The interface unit 710 may be responsible for transmitting and receiving messages, data, and other information with other devices.

The message processor 730 may interpret a message received from another device and generate a message to be transmitted to the other device. For example, the message processing unit 730 may be a communication request message transmitted from a mobile terminal, a communication request message (for example, an initial address message) transmitted to or received from another mobile terminal, the home location register 140. A variety of messages described as via the mobile switch in FIGS. 1 to 6 may be processed, such as a registration start message sent to the user, a registration response message received from the home location register 140, and the like. To this end, the message processing unit 730 may support various communication standards and protocols used in the mobile communication system 100 such as MAP and Integrated Services Digital Network (ISDN) User Part (ISP).

The determination unit 750 may determine various service use states of the mobile terminal. For example, the determination unit 750 determines whether the mobile terminal is in a call, whether the mobile terminal is in an emergency call service or unavailable state, whether the mobile terminal is in a call waiting service or in an unavailable state, and the like. You can judge. Although the determination unit 750 is illustrated as one block in FIG. 7, the present invention is not limited thereto, and a plurality of determination units may be provided to determine each service use state of the mobile terminal. For example, a first determination unit (not shown) that determines whether the mobile terminal is in a call waiting service availability state or an inactive state, and a second determination unit that determines whether the mobile terminal is in an emergency call service availability state or in an unavailable state. (Not shown) may be present independently of each other.

The controller 720 may store the subscriber profile transmitted from the home location register 140 in the visitor location register 740 and retrieve necessary information from the visitor location register 740. In addition, the controller 720 may output a paging signal, a ringback tone, and a busy tone. In addition, the controller 720 may control the operation of each component constituting the mobile switch 700 so that the mobile switch 700 performs the operations required to provide the emergency call service described above. To this end, the controller 720 may use the determination result of the determination unit 750 or the message analysis result of the message processing unit 730. Through this, each component 710 to 750 of the mobile switch 700 may be organically operated so that embodiments of the present invention described with reference to FIGS. 1 to 6 may be implemented.

In addition, the components 710 to 750 constituting the mobile exchanger 700 shown in FIG. 7 may be implemented as a module. Herein, the term 'module' refers to a hardware component such as software or a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC), and a module plays a role. However, modules are not meant to be limited to software or hardware. The module may be configured to be in an addressable storage medium and may be configured to execute one or more processors. Thus, as an example, a module may include components such as software components, object-oriented software components, class components, and task components, and processes, functions, properties, procedures, subroutines. , Segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functionality provided by the components and modules may be combined into a smaller number of components and modules or further separated into additional components and modules.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. You will understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

1 is a diagram illustrating a mobile communication system according to an embodiment of the present invention.

2 is a flowchart illustrating a location registration process according to an embodiment of the present invention.

3 is a diagram illustrating CFI2 of a MAP parameter according to an embodiment of the present invention.

4 is a flowchart illustrating a process of providing an emergency call service according to an embodiment of the present invention.

5 is a diagram illustrating UUI parameters according to an embodiment of the present invention.

6 is a flowchart illustrating a process of providing an emergency call service according to an embodiment of the present invention.

7 is a block diagram illustrating a mobile exchange according to an embodiment of the present invention.

<Explanation of symbols on main parts of the drawings>

110: base station 120: base station controller

130: mobile exchanger 140: home location register

Claims (9)

Receiving a call request message requesting a call between the calling terminal and the called terminal; Determining whether the called terminal is in a call waiting service unavailable state; When the called terminal is busy in a call waiting service unavailable state, determining whether the calling terminal is in an emergency call service available state; And And transmitting a paging signal to the called terminal and transmitting a ring back tone to the calling terminal when the calling terminal is in an emergency call service available state. The method of claim 1, The call waiting service unavailable state includes at least one of a state in which the called terminal does not subscribe to the call waiting service and a state in which the called terminal subscribes to the call waiting service but the call waiting service is deactivated. How to Provide Call Services. The method of claim 1, And transmitting a busy tone to the calling terminal when the calling terminal is in an emergency call service unavailable state. The method of claim 1, Determining whether the calling terminal is an emergency call service available state Emergency call service providing method using the emergency call service information contained in the subscriber profile of the calling terminal user obtained from the home location register. The method of claim 4, wherein The emergency call service information is set as a Mobile Application Part (MAP) parameter in the subscriber profile. The method of claim 1, Determining whether the calling terminal is an emergency call service available state Emergency call service providing method using the emergency call service information contained in the call request message. The method of claim 6, The call request message is an initial address message transmitted from an originating mobile exchange, and the emergency call service information is set as a user-to-user information (UUI) parameter of the initial address message. An interface unit for receiving a request signal for requesting a call between the calling terminal and the called terminal; A first determining unit determining whether the called terminal is in a call waiting service unavailable state; A second determining unit determining whether the calling terminal is in an emergency call service available state when the called terminal is busy in a call availability service state; And And a control unit which transmits a paging signal to the called terminal through the interface unit and transmits a ring back tone to the calling terminal when the calling terminal is in an emergency call service available state. The method of claim 8, And when the originating terminal is in an emergency call service unavailable state, the controller to transmit a busy tone to the originating terminal through the interface unit.
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