WO2012113321A1 - 主叫侧预防语音呼叫前转陷阱的方法、msc及系统 - Google Patents

主叫侧预防语音呼叫前转陷阱的方法、msc及系统 Download PDF

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Publication number
WO2012113321A1
WO2012113321A1 PCT/CN2012/071372 CN2012071372W WO2012113321A1 WO 2012113321 A1 WO2012113321 A1 WO 2012113321A1 CN 2012071372 W CN2012071372 W CN 2012071372W WO 2012113321 A1 WO2012113321 A1 WO 2012113321A1
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WO
WIPO (PCT)
Prior art keywords
calling
voice call
forwarding
called
hlr
Prior art date
Application number
PCT/CN2012/071372
Other languages
English (en)
French (fr)
Inventor
肖杰
张振华
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2012113321A1 publication Critical patent/WO2012113321A1/zh

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Classifications

    • 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
    • H04M3/54—Arrangements for diverting calls for one subscriber to another predetermined subscriber
    • H04M3/541—Arrangements for diverting calls for one subscriber to another predetermined subscriber based on information specified by the calling party
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/38—Graded-service arrangements, i.e. some subscribers prevented from establishing certain connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2203/00—Aspects of automatic or semi-automatic exchanges
    • H04M2203/20—Aspects of automatic or semi-automatic exchanges related to features of supplementary services
    • H04M2203/2005—Temporarily overriding a service configuration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2203/00—Aspects of automatic or semi-automatic exchanges
    • H04M2203/20—Aspects of automatic or semi-automatic exchanges related to features of supplementary services
    • H04M2203/2033—Call handling or answering restrictions, e.g. specified by the calling party

Definitions

  • the present invention relates to the field of mobile communication technologies, and in particular, to a method, an MSC, and a system for preventing a voice call forwarding trap on a calling side. Background technique
  • HLR Home Location Register
  • MSCs Mobile Communications Service Set
  • the HLR it is only responsible for judging whether the called user has the forwarding authority, such as whether the forwarding is authorized, whether there is a call right for the forwarding number, etc., and it is impossible to determine whether the called number may be a malicious number; The route and connection of the called party is even more powerless to detect whether the called number is suspicious. Therefore, it is impossible to prevent the voice call forwarding trap for the calling side.
  • the main object of the present invention is to provide a method, an MSC and a system for preventing a voice call forwarding trap on the calling side, which can improve the security of the calling party's voice call.
  • an embodiment of the present invention provides a method for preventing a voice call forwarding trap on a calling side, including:
  • the calling mobile switching center MSC acquires the interception voice call forwarding function subscription information from the calling home location register HLR; acquires the called user forwarding information from the called HLR; and controls the calling user's voice according to the subscription information and the forwarding information. call.
  • the subscription information includes: whether the calling user is authorized to enable or disable the interception voice call forwarding function and the authorization capability information; the authorization capability information includes temporary opening or closing, permanent opening or closing, temporary activation or going Live interception of voice call forwarding.
  • the manner in which the calling MSC obtains the interception of the voice call forwarding function subscription information from the calling HLR includes: the calling MSC/VLR initiates a registration notification or qualification application to the calling HLR, or the calling HLR calls the calling party The MSC/VLR initiates the eligibility directive.
  • the step of acquiring the called user forwarding information from the called HLR; and the step of controlling the calling user's voice call according to the subscription information and the forwarding information includes:
  • the calling MSC When the calling user initiates a voice call, the calling MSC initiates a location request message to the called HLR;
  • the forwarding indication When the forwarding indication is forwarded by the called party, whether the calling user starts to intercept the voice call forwarding function is obtained from the subscription information, and if yes, the call is terminated, and the destination number is released; To the destination number.
  • the step of acquiring the called user forwarding information from the called HLR; and the step of controlling the calling user's voice call according to the subscription information and the forwarding information includes:
  • the calling MSC When the calling user initiates a voice call, the calling MSC initiates a location request message to the called HLR;
  • the step of obtaining the forwarded information of the called user from the called HLR; and the step of controlling the voice call of the calling user according to the subscription information and the forwarding information comprises:
  • the calling MSC When the calling user provides the interception voice call forwarding function transient activation or deactivation supplementary service code, the calling MSC initiates a supplementary service application message carrying the dialed digits to the calling HLR; receiving the calling HLR according to the supplementary The service application message and the supplementary service request response message returned by the subscription information carrying the information of the interception voice call forwarding extension field;
  • the calling service user obtains whether the calling user turns on the interception voice call forwarding function; if yes, terminates the call; otherwise, connects to the forwarding number or obtains the forwarding number.
  • the invention also provides an MSC for preventing a voice call forwarding trap on the calling side, comprising: a subscription information acquisition module and a forward control module;
  • the subscription information obtaining module is configured to acquire, from the calling HLR, the interception voice call forwarding function subscription information
  • the forwarding control module is configured to acquire forwarded information of the called user from the called HLR, and control the voice call of the calling user according to the subscription information and the forwarding information.
  • the manner in which the calling MSC obtains the interception of the voice call forwarding function subscription information from the calling HLR includes: the calling MSC/VLR initiates a registration notification or qualification application to the calling HLR, or the calling HLR calls the calling party The MSC/VLR initiates the eligibility directive.
  • the forwarding control module includes: a first sending unit, a first receiving unit, and a first An acquisition unit and a first forward control unit; wherein
  • the first sending unit is configured to initiate a location request message to the called HLR when the calling user initiates a voice call;
  • the first receiving unit is configured to receive a location request response message that is returned by the called HLR and carries a forwarding indication and a destination number;
  • the first obtaining unit is configured to: when the forward forwarding indication is forwarded by the called party, obtain, from the subscription information, whether the calling user starts to intercept the voice call forwarding function;
  • the first forwarding control unit is configured to terminate the call and release the destination number when the forward forwarding indication is forwarded by the called party and the calling user turns on the intercepting voice call forwarding function; otherwise, proceed to the Destination number.
  • the forwarding control module includes: a second sending unit, a second receiving unit, a first call establishing unit, a second obtaining unit, and a second forwarding control unit;
  • the second sending unit is configured to initiate a location request message to the called HLR when the calling user initiates a voice call;
  • the second receiving unit is configured to receive a location request response message carrying the routing information returned by the called HLR; and after the voice path with the called MSC is established, the called user is busy or unanswered and called When the user activates the call forwarding capability, the user receives the redirected call request message sent by the called MSC and carries the redirected callback reason;
  • the first call establishing unit is configured to establish a voice path to the called MSC according to the location request response message;
  • the second obtaining unit is configured to obtain, from the subscription information, whether the calling user starts to intercept the voice call forwarding function
  • the second forwarding control unit is configured to terminate the call when the calling user turns on the interception voice call forwarding function; otherwise, send a forward number application message to the called HLR to obtain a corresponding forwarding number.
  • the forwarding control module includes: a third sending unit, a third receiving unit, a second call establishing unit, a third obtaining unit, and a third forwarding control unit;
  • the third sending unit is configured to: when the calling user provides the intercepting voice call forwarding function to temporarily activate or deactivate the supplementary service code, initiate a supplementary service application message carrying the dialed digit to the calling HLR;
  • the third receiving unit is configured to receive a supplementary service request response message that is sent by the calling HLR according to the supplementary service request message and the subscription information, and carries the intercepted voice call forwarding extension field information;
  • the second call establishing unit is configured to initiate a call to the called user according to the supplementary service response message and by the called HLR;
  • the third obtaining unit is configured to: when the called user forwards, obtain, from the supplementary service request response message, whether the calling user starts to intercept the voice call forwarding function;
  • the third forwarding control unit is configured to terminate the call when the calling user turns on the function of intercepting the voice call forwarding; otherwise, the connection is forwarded to the forwarding number or the forwarding number is obtained.
  • the invention also provides a system for preventing a voice call forwarding trap on the calling side, comprising: an HLR and an MSC/VLR, wherein:
  • the HLR is configured to: the registered user intercepts the voice call forwarding function subscription information; the MSC/VLR is configured to acquire the user interception voice call forwarding function subscription information from the HLR, and obtain the called user forward from the called HLR. Information; and controlling the voice call of the user according to the subscription information and the forwarding information.
  • the MSC includes: a subscription information acquisition module and a forwarding control module; wherein the subscription information acquisition module is configured to acquire, from the calling HLR, the interception voice call function forwarding subscription information;
  • the forwarding control module is configured to acquire the forwarded information of the called user from the called HLR; and control the voice call of the calling user according to the subscription information and the forwarding information.
  • the method, the MSC and the system for preventing a voice call forwarding trap on the calling side use the HLR to provide a user-level voice call forwarding interception subscription function, and associate the HLR with the MSC/VLR, once the calling user signs the contract Function, when dialing another number, if the called number is forwarded or forwarded based on the called number, the calling MSC/VLR finds that the calling user subscribes to the voice call forwarding interception, and then actively terminates the call without connecting, thereby enabling The voice call forwarding trap is avoided to improve the security of the calling party's voice call.
  • the HLR also provides temporary opening or bypassing the interception voice call forwarding function, which facilitates application promotion of the service.
  • the embodiment of the present invention has small transformations for the core network element HLR and the MSC/VLR, is easy to implement, and fully utilizes existing network resources, thereby saving costs.
  • FIG. 1 is a schematic structural diagram of an N07 network according to an embodiment of the present invention.
  • FIG. 2 is a schematic flow chart of a method for preventing a voice call forwarding trap on the calling side of the present invention
  • FIG. 3 is a schematic diagram of a REGNOT process in which the HLR and the MSC/VLR cooperate to intercept the voice call forwarding function in the foregoing embodiment;
  • FIG. 4 is a schematic diagram of a QUALREQ process in which the HLR and the MSC/VLR cooperate to intercept the voice call forwarding function in the foregoing embodiment
  • FIG. 5 is a schematic diagram of a QUALDIR process in which the HLR and the MSC/VLR cooperate to intercept the voice call forwarding function in the foregoing embodiment
  • FIG. 6 is a schematic flowchart of an embodiment of acquiring a forwarded call information of a called user from a called HLR in the foregoing embodiment; controlling a voice call of the calling user according to the subscription information and the forwarding information;
  • FIG. 7 is implemented based on FIG. The mode of the HLR cooperates with the MSC/VLR to support the LOCREQ process diagram for intercepting the voice call forwarding function;
  • FIG. 8 is a schematic flowchart of another embodiment of controlling the forward call information of the called user from the called HLR in the foregoing embodiment; and controlling the voice call of the calling user according to the subscription information and the forwarding information; 9 is a schematic diagram of a REDREQ process for intercepting a voice call forwarding function based on the cooperation between the MSC and the VLR according to the embodiment shown in FIG. 8;
  • FIG. 10 is a flow chart showing still another embodiment of controlling the forward call information of the called user from the called HLR in the above embodiment; and controlling the voice call of the calling user according to the subscription information and the forwarding information;
  • FIG. 11 is a schematic diagram of a FEATREQ flow diagram of the HLR and MSC/VLR cooperation support for intercepting a voice call forwarding function to activate, deactivate or modify an interception authorization capability based on the embodiment shown in FIG. 10;
  • FIG. 12 is a flowchart of a transient activation or deactivation FEATREQ of the HLR and MSC/VLR cooperative support interception voice call forwarding function based on the embodiment shown in FIG. 10;
  • FIG. 13 is a schematic structural diagram of an MSC for preventing a voice call forwarding trap on the calling side of the present invention
  • FIG. 14 is a schematic diagram of a structure of a forward control module in an MSC for preventing a voice call forwarding trap on the calling side of the present invention
  • 15 is a schematic diagram of another structure of a forward control module in an MSC for preventing a voice call forwarding trap on the calling side of the present invention
  • 16 is a schematic diagram of another structure of the MSC in the forward side control module for preventing a voice call forwarding trap on the calling side of the present invention
  • Figure 17 is a block diagram showing an embodiment of a system for preventing a voice call forwarding trap on the calling side of the present invention. detailed description
  • the solution of the embodiment of the present invention is mainly to provide the user to intercept the voice call forwarding function subscription information through the HLR.
  • the MSC/VLR obtains the user interception voice call forwarding function subscription information and the user's dialing mode according to the slave HLR.
  • the calling side controls the voice call forwarding of the user to avoid the forward trap and improve the security of the user.
  • the operating environment of the embodiment of the present invention relates to a core network based on the N07 network, as shown in FIG.
  • MT mobile terminal accesses the core network through the wireless network
  • MSC Mobile Switching Center
  • VLR Visitor Location Register
  • HLR Home Location Register
  • the register and the AUC authentication center
  • the MSC is the mobile switching center, which is responsible for calling and connecting users.
  • the VLR is the visitor location register, which is used to temporarily store the user's subscription information.
  • the HLR is The home location register is used to permanently save the user's subscription information and save the user's location information in real time; the core network element MSC, VLR and HLR communicate through the N07 signaling network.
  • an embodiment of the present invention provides a method for preventing a voice call forwarding trap based on the foregoing network structure, a joint HLR, and an MSC/VLR, including:
  • Step S101 The calling MSC obtains the interception voice call forwarding function subscription letter from the calling HLR.
  • the HLR provides a user-level interception voice call forwarding subscription function, and the user can select to authorize the function to be enabled, and the temporary opening is explicitly/ Off, or permanent on/off;
  • HLR also provides interception voice call forwarding function activation/deactivation steady state and transient supplementary service code, so that users can turn this function on or off autonomously, or temporarily activate/deactivate when calling Intercept the voice call forwarding feature.
  • the user can register the subscription to the HLR to intercept the voice call forwarding function through the mobile terminal, and can also perform this function through the business service desk.
  • the HLR will save the user-registered interception voice call forwarding function subscription information, and the subscription information includes: Whether the user is authorized to enable or disable the interception voice call forwarding function and the authorization capability information; the authorization capability information includes temporary on or off, permanent on or off, temporary activation or deactivation to intercept the voice call forwarding function.
  • the HLR correctly carries the subscription information to the MSC/VLR in the service item list or other extended parameters, and notifies the MSC/VLR user of the interception.
  • the voice call forwarding function subscription information is kept in sync with the MSC/VLR subscription information in real time.
  • the user is the calling user
  • the calling MSC obtains the interception voice call forwarding function subscription information of the calling user from the calling HLR and saves the calling MSC
  • the calling MSC obtains the calling user intercepting the voice call forwarding function from the calling HLR.
  • the manner of signing information includes: The calling MSC/VLR initiates a registration notification (REGNOT) or a qualification application ( QUALREQ) to the calling HLR, or the calling HLR actively initiates a qualification instruction (QUALDIR) to the calling MSC/VLR.
  • REGNOT registration notification
  • QUALREQ qualification application
  • QUALDIR qualification instruction
  • Step S102 Acquire the forwarded information of the called user from the called HLR; and control the voice call of the calling user according to the subscription information and the forwarding information.
  • the calling MSC when the calling user dials the called number, if the called number is forwarded based on the called number, or the forwarding number is to be obtained, the calling MSC combines with the VLR according to the calling mode of the calling user and saves The interception of the voice call forwarding function of the user is intercepted, and the voice call forwarding of the user is controlled at the calling side to achieve permanent interception of the voice call forward and permanent interception; or temporarily intercept or not intercept the call. Voice call forwarding in the process, etc.
  • the calling mode of the calling user includes the normal dialing mode and the special dialing mode.
  • the special dialing mode means that the number dialed by the user carries the transient activation or deactivated voice call forwarding service code plus the called number.
  • the calling HLR notifies the calling MSC/VLR user to intercept the voice call forwarding function subscription information, that is, the calling MSC/VLR obtains the calling user intercepting the voice call forwarding function subscription information related to REGNOT.
  • Three application scenarios, QUALDIR and QUALREQ, correspond to Figure 3, Figure 4 and Figure 5, respectively.
  • the calling HLR cooperates with the calling MSC/VLR to support the REGNOT (registration notification) flow chart for intercepting the voice call forwarding function.
  • Step 21 the calling HLR receives the registration notification message REGNOT of the calling VLR-1;
  • Step 22 The calling HLR finds that the current user is registered at the calling VLR-2, and sends a cancel registration message to the calling VLR-2.
  • Step 23 the calling VLR-2 returns a response message
  • Step 24 The calling HLR finds that the user subscribes to intercept the voice call forwarding function, and correctly carries the subscription information to the calling VLR-1 in the service item list (Profile), and the calling VLR-1 saves the subscription information.
  • Profile service item list
  • the calling HLR cooperates with the calling MSC/VLR to support the QUALREQ (Qualification Application) flow chart for intercepting the voice call forwarding function.
  • QUALREQ Quality Application
  • Step 31 The calling HLR receives the qualification application message QUALREQ of the calling VLR.
  • Step 32 The calling HLR finds that the user subscribes to intercept the voice call forwarding function, and correctly carries the subscription information to the calling VLR in the service item list (Profile), and the calling VLR saves the subscription information.
  • Profile service item list
  • the calling HLR cooperates with the calling MSC/VLR to support the QUALDIR flowchart for intercepting the voice call forwarding function.
  • Step 41 The calling HLR finds that the user subscribes to intercept the voice call forwarding function, and correctly carries the subscription information to the calling VLR in the service item list (Profile);
  • Step 42 the calling VLR saves the subscription information, and the calling VLR returns a qualdir qualification command response message to the calling HLR.
  • the foregoing step S102 may specifically include:
  • Step S1021 when the calling user initiates a voice call, the calling MSC sends the called HLR to the called HLR. From the location application message;
  • Step S1022 Receive a location application response message that is sent by the called HLR and carries a forwarding indication and a destination number.
  • Step S1023 When the current forwarding indication is forwarded by the called party, the calling information is obtained from the subscription information to enable the intercepting voice call forwarding function, and if yes, proceeding to step S1024; otherwise, proceeding to step S1025;
  • the calling MSC obtains from the calling VLR whether the calling user starts to intercept the voice call and forwards the work.
  • Step S1024 terminating the call, releasing the destination number
  • Step S1025 connecting to the destination number.
  • the LOCREQ (Location Request) process for the called HLR and the calling MSC/VLR to cooperate to intercept the voice call forwarding function is as follows:
  • Step 51 the called HLR receives the location request LOCREQ message initiated by the calling MSC1;
  • Step 52 if the called HLR finds that it is an interoffice call, sends a route request ROUTREQ to the VLR2 registered by the called user, otherwise proceeds to step 54;
  • Step 53 VLR2 returns a routing digital TLDN to the called HLR;
  • Step 54 The called HLR judges that the called user satisfies the forwarding condition according to the existing 41D protocol, and returns a location application response message to the calling MSC1. If the called HLR directly determines that the forwarding occurs, it will carry a forwarding instruction to the calling party. MSC1.
  • Step 55 The calling MSC1 obtains, from the calling VLR, whether the calling party turns on the interception voice call forwarding function, and if it is enabled, terminates the call, and if the interception is not enabled, continues to connect to the forwarding number.
  • step S102 may specifically include: Step S1026, when the calling user initiates a voice call, the calling MSC initiates a location request message to the called HLR.
  • Step S1027 Receive a location request response message carrying the routing information returned by the called HLR.
  • Step S1028 establishing a voice path to the called MSC according to the location request response message;
  • Step S1029 when the called user is busy or no answer and the called user activates the call forwarding capability, receiving the carried MSC sends the redirected Redirecting the reason for the call and calling the application message;
  • Step S1030 Obtain, from the subscription information, whether the calling user turns on the interception voice call forwarding function, and if yes, proceeds to step S1031; otherwise, proceeds to step S1032;
  • the calling MSC obtains from the calling VLR whether the calling user starts to intercept the voice call and forwards the work.
  • Step S1031 terminating the call
  • Step S1032 Send a forward number application message to the called HLR to obtain a corresponding forwarding number.
  • the REDREQ process of the cooperation between the MSC/VLR and the interception voice call forwarding function is as follows:
  • Step 61 the called HLR receives the location request LOCREQ message initiated by the calling MSC1; Step 62, if the called HLR finds that it is an interoffice call, sends a routing request message ROUTREQ to the VLR2 registered by the called user, otherwise proceeds to step 65;
  • Step 63 the called VLR2 sends a routing request message ROUTREQ to the called MSC2;
  • Step 64 the called MSC2 allocates a TLDN (temporary local phonebook number) and returns a routing digital TLDN to the called VLR2 in the routing response message routreq;
  • TLDN temporary local phonebook number
  • Step 65 the called VLR2 returns a routing digital TLDN to the called HLR;
  • Step 66 the called HLR returns the locreq location request response according to the existing 41D protocol.
  • the information is sent to the calling MSC1, which includes routing information in the form of terminal list parameters.
  • Step 68 After receiving the call between the calling MSC1, the called MSC2 pages the called user, and if it receives the paging response, then rings. If the called user does not respond to the page or does not answer after ringing or the user is busy, the called MSC2 determines, according to the called service item list (Profile), that the called user is activated when there is no paging response or no paging response status or busy. Call forwarding capability;
  • Profile called service item list
  • Step 69 The called MSC2 sends a redirected re-call request message (REDREQ) to the originating originating MSC1, indicating that the call forwarding is caused by no paging response or no answer or busy;
  • REDREQ redirected re-call request message
  • Step 70 The calling MSC1 obtains, from the calling VLR, whether the calling party starts to intercept the voice call forwarding function, and if it is enabled, terminates the call, and simultaneously announces the calling number. If the interception is not enabled, the calling party initiates the MSC1. Continue to send the forward number request message (TRANUMREQ) to the called HLR to apply for the call forwarding number.
  • TRANUMREQ forward number request message
  • the foregoing step S102 may specifically include:
  • Step S1033 When the calling user provides the temporary activation or deactivation service code for intercepting the voice call forwarding function, the calling MSC initiates a supplementary service application message carrying the dialed digits to the calling HLR;
  • Step S1034 Receive a supplementary service request response message that carries the interception voice call forwarding extension field information returned by the calling HLR according to the supplementary service application message and the subscription information.
  • Step S1035 Start a call according to the supplementary service request response message and send the called user to the called user through the called HLR.
  • Step S1036 obtaining, from the supplementary service request response message, whether the calling user turns on the interception voice call forwarding function; if yes, proceeding to step S1037; otherwise, proceeding to step S1038;
  • Step S1037 terminating the call; Step S1038, connecting to the forwarding number or obtaining the forwarding number.
  • the HLR supports the user to modify the FEATREQ application scenario involved in the current personal interception voice call forwarding function subscription status by using the supplementary service code, assuming that the current called party is called.
  • the user authorized to intercept the voice call forwarding contract function.
  • Step 71 The calling MSC initiates a supplementary service request message (FEATREQ) to the calling HLR, where the message includes a dialed digit.
  • FEATREQ supplementary service request message
  • Step 72 If the calling HLR finds that the number dialed by the user only carries the active or deactivated voice call forwarding function supplement service code, for example, *111, the calling HLR correctly saves the calling user intercepting the voice call forwarding function signing. Information into the user database;
  • Step 73 the calling HLR sends a qualification instruction message (QUALDIR), and carries the latest interception voice call forwarding function subscription information to the calling MSC in the service item list (Profile); Step 74, the calling MSC will sign the subscription information Once saved, the calling MSC returns a qualdir response message to the calling HLR.
  • QUALDIR qualification instruction message
  • Profile service item list
  • the HLR supports user autonomous transient activation or deactivation to intercept the voice call forwarding function, and the MSC/VLR cooperates to complete the temporary interception or not intercept the call.
  • the FEATREQ (Service Request) application scenario involved in the voice call forwarding process in the process assuming that the currently called user is authorized to intercept the voice call forwarding subscription function, and provides the temporary function of intercepting the voice call forwarding function or deactivating the supplementary service code.
  • the specific process is as follows:
  • Step 81 The calling MSC1 sends a supplementary service request message (FEATREQ) to the currently called HLR, where the message includes a dialed digit.
  • FEATREQ supplementary service request message
  • Step 82 If the calling HLR finds that the number dialed by the user carries the transient activation or deactivates the voice call forwarding function, the supplementary service code and the called user number, such as *110#13888888888, and the currently called user is authorized to intercept the voice call. Forward the contract function, and enable the function to activate transiently Or deactivate the right, then carry the extension field in the featreq response message, corresponding to indicate whether to enable the interception voice call forwarding function, other parameters are correctly carried according to the CDMA 41D protocol, and returned to the calling MSC1;
  • Step 83 The calling MSC1 finds that the intercepting voice call forwarding extension field is in the indication in the featreq response message, and saves;
  • Step 84 the calling MSC1 initiates a call to the called number, and the process is forwarded based on the called number, and the process is similar to step 51 to step 54 of FIG. 7 or step 61 to step 69 of FIG. 9;
  • Step 85 The calling MSC1 obtains the previously intercepted extended call forwarding extension field information obtained from the featreq response message, and if the interception is needed, terminates the call, and simultaneously plays a prompt to the calling number. If no interception is required, the release is performed. , Continue to respond to the forwarding number or go to get the forwarding number.
  • the present embodiment provides a complete set of methods for the active call side to actively resolve the voice call forwarding trap through the cooperation of the home location register (HLR) and the mobile switching center/visit location register (MSC/VLR) device.
  • HLR home location register
  • MSC/VLR mobile switching center/visit location register
  • an embodiment of the present invention provides an MSC for preventing a voice call forwarding trap on a calling side, including: a subscription information obtaining module 701 and a forwarding control module 702, wherein: the subscription information obtaining module 701 is configured to Obtaining the interception voice call forwarding function subscription information from the calling HLR;
  • the forwarding control module 702 is configured to obtain the forwarded information of the called user from the called HLR; and control the voice call of the calling user according to the subscription information and the forwarding information.
  • the HLR provides a user-level interception voice call forwarding subscription function, and the user can select to authorize the function to be enabled, and whether it is temporarily turned on/off or permanently turned on/off;
  • the HLR also provides an interception voice call forwarding function activation/deactivation steady state and transient supplementary service code so that the user can turn the function on or off autonomously, or temporarily activate/deactivate the voice call forwarding function during the call.
  • the user can register the subscription to the HLR to intercept the voice call forwarding function through the mobile terminal, and can also perform this function through the business service desk.
  • the HLR will save the user-registered interception voice call forwarding function subscription information, and the subscription information includes: Whether the user is authorized to enable or disable the interception voice call forwarding function and the authorization capability information; the authorization capability information includes temporary on or off, permanent on or off, temporary activation or deactivation to intercept the voice call forwarding function.
  • the HLR correctly carries the subscription information to the MSC/VLR in the service item list or other extended parameters, and notifies the MSC/VLR user to intercept the voice call forwarding function subscription information, in real time. Keep up with the MSC/VLR subscription information.
  • the user is the calling user
  • the calling MSC in conjunction with the VLR, obtains the interception voice call forwarding function subscription information of the calling user from the calling HLR through the subscription information obtaining module 701, and saves, and the calling MSC obtains the calling party from the calling HLR.
  • the manner in which the user intercepts the voice call forwarding function subscription information includes: the calling MSC/VLR initiates a registration notification (REGNOT) or a qualification application (QUALREQ) to the calling HLR, or the calling HLR actively initiates an authorization instruction to the calling MSC/VLR ( QUALDIR ) 0
  • the calling MSC When the calling party dials the called number, if the called number is forwarded based on the called number, or if the forwarding number is to be obtained, the calling MSC combines with the VLR to specifically forward the forwarding method according to the calling user according to the calling user control module 702.
  • the saved user's interception voice call forwarding function signing situation is intercepted, and the user's voice call forwarding is controlled at the calling side to realize permanent interception of the voice call forwarding, permanent non-blocking; or temporarily intercepting or not intercepting this time Voice call forwarding during a call, etc.
  • the calling mode of the calling user includes the normal dialing mode and the special dialing mode.
  • the special dialing mode means that the number dialed by the user carries the transient activation or deactivated voice call forwarding service code plus the called party. Number.
  • the forward control module 702 may specifically include: a first sending unit 7021, a first receiving unit 7022, a first obtaining unit 7023, and a first forwarding control unit 7024. , among them:
  • the first sending unit 7021 is configured to initiate a location request message to the called HLR when the calling user initiates a voice call;
  • the first receiving unit 7022 is configured to receive a location request response message that is returned by the called HLR and carries a forwarding indication and a destination number;
  • the first obtaining unit 7023 is configured to: when the current forwarding indication is forwarded by the called party, obtain, from the subscription information, whether the calling user turns on the intercepting voice call forwarding function;
  • the first forwarding control unit 7024 is configured to terminate the call and release the destination number when the current forwarding indication is forwarded by the called party and the calling user turns on the intercepting voice call forwarding function; otherwise, the destination number is connected.
  • the forward control module 702 may specifically include: a second sending unit 7025, a second receiving unit 7026, a first call establishing unit 7027, and a second acquiring unit 7028. And a second forward control unit 7029, wherein:
  • the second sending unit 7025 is configured to initiate a location request message to the called HLR when the calling user initiates a voice call;
  • the second receiving unit 7026 is configured to receive a location request response message carrying the routing information returned by the called HLR; and after the voice path with the called MSC is established, the called user is busy or unanswered and the called user activates the call.
  • the redirection call request message that is sent by the called MSC and carries the redirection and re-calling reason is received;
  • the first call establishing unit 7027 is configured to establish a voice path to the called MSC according to the location response message;
  • the second obtaining unit 7028 is configured to obtain, from the subscription information, whether the calling user opens the interception Voice call forwarding function;
  • the second forwarding control unit 7029 is configured to terminate the call when the calling user turns on the intercepting voice call forwarding function; otherwise, send a forward number application message to the called HLR to obtain a corresponding forwarding number.
  • the forwarding control module 702 may specifically include: a third sending unit 7030, a third receiving unit 7031, a second call establishing unit 7032, and a third acquiring unit 7033. And a third forward control unit 7034, wherein:
  • the third sending unit 7030 is configured to: when the calling user provides the intercepting voice call forwarding function to temporarily activate or deactivate the supplementary service code, initiate a supplementary service application message carrying the dialed digit to the calling HLR;
  • the third receiving unit 7031 is configured to receive a supplementary service request response message carrying the intercepted voice call forwarding extension field information returned by the calling HLR according to the supplementary service request message and the subscription information;
  • the second call establishing unit 7032 is configured to initiate a call to the called user according to the supplementary service response message and by the called HLR;
  • the third obtaining unit 7033 is configured to: when the called user forwards, obtain, from the supplementary service application message, whether the calling user starts to intercept the voice call forwarding function;
  • the third forwarding control unit 7034 is configured to terminate the call when the calling user turns on the interception voice call forwarding function; otherwise, the connection is forwarded to the forwarding number or the forwarding number is obtained.
  • an embodiment of the present invention provides a system for preventing a voice call forwarding trap on a calling side, including: an HLR 1101 and an MSC/VLR 1102, where:
  • the HLR 1101 is configured to register the user to intercept the voice call forwarding function subscription information
  • the MSC/VLR 1102 is configured to obtain the user interception voice call forwarding function subscription information from the HLR 1101, obtain the called user forwarding information from the called HLR, and control the user's voice call according to the subscription information and the forwarding information.
  • a method for preventing a voice call forwarding trap on the calling side, an MSC and a system using the HLR to provide a user-level voice call forwarding subscription function, and combining the HLR with the MSC/VLR, once the calling user signs the function, dials If other numbers are forwarded or forwarded based on the called number, the calling MSC/VLR finds that the calling user subscribes to the voice call forwarding interception, and then actively terminates the call without connecting, avoiding the voice call.
  • the HLR also provides temporary opening or bypassing the voice call forwarding function to facilitate the application promotion of the service.
  • the invention has little modification to the core network element HLR and MSC/VLR, is easy to implement, fully utilizes existing network resources, and saves cost.

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Abstract

本发明公开了一种主叫侧预防语音呼叫前转陷阱的方法，包括：主叫MSC从主叫HLR获取拦截语音呼叫前转功能签约信息；从被叫HLR获取被叫用户前转信息；根据签约信息和前转信息控制主叫用户的语音呼叫。本发明还相应地公开了一种主叫侧预防语音呼叫前转陷阱的MSC及系统。通过本发明，一旦主叫用户签约该功能，拨打其它号码时，如果基于该被叫号码发生了前转或者将发生前转，主叫MSC/VLR发现主叫用户签约语音呼叫前转拦截，则主动终止呼叫，不进行接续，避免了语音呼叫前转陷阱；HLR还提供临时开启或者越过拦截语音呼叫前转功能，方便该业务的应用推广，且充分利用现有网络资源，节约成本。

Description

主叫侧预防语音呼叫前转陷阱的方法、 MSC及系统 技术领域
本发明涉及移动通信技术领域， 尤其涉及一种主叫侧预防语音呼叫前 转陷阱的方法、 MSC及系统。 背景技术
在日常生活中， 人们经常会收到一些奇怪的电话， 这些电话往往振铃 一下就挂机， 这类电话号码和国内普通号码没有任何区别， 当人们按该电 话号码回拨时， 则会听到一些广告、 中奖等等宣传信息或者可能被前转到 某个声讯台上， 比如被接入进国外色情聊天或者反动咨询中心， 某些不法 分子会从中收取转接费用。 这些恶意前转行为不仅对人们的生活带来骚扰， 也会对个人话费和运营商话费产生损失。
目前， 核心网设备（包括 HLR、 MSC等）按照标准协议无法控制这种 恶意前转行为。 对于 HLR, 只负责判断被叫用户是否具有前转权限， 比如 前转是否授权、 对前转号码有无呼叫权限等， 而无法判断该被叫号码是否 可能为恶意号码； 对于 MSC, 只负责对被叫的路由和接续， 对检测被叫号 码是否可疑更是无能为力。 因此， 对于主叫侧更是无法预防语音呼叫前转 陷阱。 发明内容
本发明的主要目的在于提供一种主叫侧预防语音呼叫前转陷阱的方 法、 MSC及系统， 能够提高主叫用户语音呼叫的安全性。
为了达到上述目的， 本发明实施例提出一种主叫侧预防语音呼叫前转 陷阱的方法， 包括： 主叫移动交换中心 MSC从主叫归属位置寄存器 HLR获取拦截语音呼 叫前转功能签约信息； 从被叫 HLR获取被叫用户前转信息； 根据所述签约 信息和前转信息控制主叫用户的语音呼叫。
优选地， 所述签约信息包括： 主叫用户是否授权开启或关闭拦截语音 呼叫前转功能以及授权能力信息； 所述授权能力信息包括暂时性开启或关 闭、 永久性开启或关闭、 临时激活或去活拦截语音呼叫前转功能。
优选地， 所述主叫 MSC从主叫 HLR获取拦截语音呼叫前转功能签约 信息的方式包括： 主叫 MSC/VLR向主叫 HLR发起登记通知或资格申请， 或者所述主叫 HLR向主叫 MSC/VLR发起资格指令。
优选地， 所述从被叫 HLR获取被叫用户前转信息； 根据所述签约信息 和前转信息控制主叫用户的语音呼叫的步驟包括：
当主叫用户发起语音呼叫时， 所述主叫 MSC向被叫 HLR发起位置申 请消息；
接收所述被叫 HLR返回的携带有前转指示以及目的号码的位置申请响 应消息；
当所述前转指示为被叫前转时， 从所述签约信息中获取主叫用户是否 开启拦截语音呼叫前转功能， 若是， 则终止呼叫， 释放所述目的号码； 否 贝' J , 接续至所述目的号码。
优选地， 所述从被叫 HLR获取被叫用户前转信息； 根据所述签约信息 和前转信息控制主叫用户的语音呼叫的步驟包括：
当主叫用户发起语音呼叫时， 所述主叫 MSC向被叫 HLR发起位置申 请消息；
接收所述被叫 HLR返回的携带有路由选择信息的位置申请响应消息； 根据所述位置申请响应消息建立至被叫 MSC的话音通路；
当被叫用户忙或无应答且被叫用户激活呼叫前转能力时， 接收被叫 MSC发送的携带有改向再呼原因的改向再呼申请消息；
从所述签约信息中获取主叫用户是否开启拦截语音呼叫前转功能， 若 是， 则终止呼叫； 否则， 向被叫 HLR发送前转号码申请消息， 获取对应的 前转号码。
优选地， 所述从被叫 HLR获取被叫用户前转信息； 根据签约信息和前 转信息控制主叫用户的语音呼叫的步驟包括：
当主叫用户提供拦截语音呼叫前转功能暂态激活或去活补充业务码 时， 主叫 MSC向主叫 HLR发起携带有拨号数字的补充业务申请消息； 接收所述主叫 HLR根据所述补充业务申请消息以及签约信息返回的携 带有拦截语音呼叫前转扩展字段信息的补充业务申请响应消息；
根据所述补充业务申请响应消息并通过被叫 HLR 向被叫用户发起呼 叫；
当被叫用户发生前转时， 从所述补充业务申请响应消息中获取主叫用 户是否开启拦截语音呼叫前转功能； 若是， 则终止呼叫； 否则， 接续至前 转号码或获取前转号码。
本发明还提出一种主叫侧预防语音呼叫前转陷阱的 MSC, 包括： 签约 信息获取模块和前转控制模块； 其中
所述签约信息获取模块， 设置为从主叫 HLR获取拦截语音呼叫前转功 能签约信息；
所述前转控制模块， 设置为从被叫 HLR获取被叫用户前转信息； 根据 所述签约信息和前转信息控制主叫用户的语音呼叫。
优选地， 所述主叫 MSC从主叫 HLR获取拦截语音呼叫前转功能签约 信息的方式包括： 主叫 MSC/VLR向主叫 HLR发起登记通知或资格申请， 或者所述主叫 HLR向主叫 MSC/VLR发起资格指令。
优选地， 所述前转控制模块包括： 第一发送单元、 第一接收单元、 第 一获取单元和第一前转控制单元； 其中，
所述第一发送单元， 设置为当主叫用户发起语音呼叫时， 向被叫 HLR 发起位置申请消息；
所述第一接收单元， 设置为接收所述被叫 HLR返回的携带有前转指示 以及目的号码的位置申请响应消息；
所述第一获取单元， 设置为当所述前转指示为被叫前转时， 从所述签 约信息中获取主叫用户是否开启拦截语音呼叫前转功能；
所述第一前转控制单元， 设置为当所述前转指示为被叫前转且主叫用 户开启拦截语音呼叫前转功能时， 终止呼叫， 释放所述目的号码； 否则， 接续至所述目的号码。
优选地， 所述前转控制模块包括： 第二发送单元、 第二接收单元、 第 一呼叫建立单元、 第二获取单元和第二前转控制单元； 其中，
所述第二发送单元， 设置为当主叫用户发起语音呼叫时， 向被叫 HLR 发起位置申请消息；
所述第二接收单元， 设置为接收所述被叫 HLR返回的携带有路由选择 信息的位置申请响应消息； 以及当建立与被叫 MSC的话音通路后、 被叫用 户忙或无应答且被叫用户激活呼叫前转能力时，接收被叫 MSC发送的携带 有改向再呼原因的改向再呼申请消息；
所述第一呼叫建立单元， 设置为根据所述位置申请响应消息建立至被 叫 MSC的话音通路；
所述第二获取单元， 设置为从所述签约信息中获取主叫用户是否开启 拦截语音呼叫前转功能；
所述第二前转控制单元， 设置为当主叫用户开启拦截语音呼叫前转功 能时， 终止呼叫； 否则， 向被叫 HLR发送前转号码申请消息， 获取对应的 前转号码。 优选地， 所述前转控制模块包括： 第三发送单元、 第三接收单元、 第 二呼叫建立单元、 第三获取单元和第三前转控制单元； 其中，
所述第三发送单元， 设置为当主叫用户提供拦截语音呼叫前转功能暂 态激活或去活补充业务码时， 向主叫 HLR发起携带有拨号数字的补充业务 申请消息；
所述第三接收单元， 设置为接收所述主叫 HLR根据所述补充业务申请 消息以及签约信息返回的携带有拦截语音呼叫前转扩展字段信息的补充业 务申请响应消息；
所述第二呼叫建立单元， 设置为根据所述补充业务响应消息并通过被 叫 HLR向被叫用户发起呼叫；
所述第三获取单元， 设置为当被叫用户发生前转时， 从所述补充业务 申请响应消息中获取主叫用户是否开启拦截语音呼叫前转功能；
所述第三前转控制单元， 设置为当主叫用户开启拦截语音呼叫前转功 能时， 终止呼叫； 否则， 接续至前转号码或获取前转号码。
本发明还提出一种主叫侧预防语音呼叫前转陷阱的系统， 包括： HLR 以及 MSC/VLR, 其中：
所述 HLR, 设置为注册用户拦截语音呼叫前转功能签约信息； 所述 MSC/VLR, 设置为从所述 HLR获取用户拦截语音呼叫前转功能 签约信息， 从被叫 HLR获取被叫用户前转信息； 并根据所述签约信息和前 转信息控制所述用户的语音呼叫。
优选地， 所述 MSC包括： 签约信息获取模块和前转控制模块； 其中， 所述签约信息获取模块， 设置为从主叫 HLR获取拦截语音呼叫功能前 转签约信息；
所述前转控制模块， 设置为从被叫 HLR获取被叫用户前转信息； 根据 所述签约信息和前转信息控制主叫用户的语音呼叫。 本发明实施例提出的主叫侧预防语音呼叫前转陷阱的方法、 MSC及系 统， 使用 HLR提供用户级语音呼叫前转拦截签约功能， 并将 HLR 与 MSC/VLR联合， 一旦主叫用户签约该功能， 拨打其它号码时， 如果基于该 被叫号码发生了前转或者将发生前转，主叫 MSC/VLR发现主叫用户签约语 音呼叫前转拦截， 则主动终止呼叫， 不进行接续， 从而能够避免语音呼叫 前转陷阱， 提高主叫用户语音呼叫的安全性； 同时， HLR还提供临时开启 或者越过拦截语音呼叫前转功能， 方便该业务的应用推广。 本发明实施例 对于核心网网元 HLR和 MSC/VLR改造很小， 易于实现， 且充分利用现有 网络资源， 节约成本。 附图说明
图 1是本发明实施例涉及的 N07网络结构示意图；
图 2是本发明主叫侧预防语音呼叫前转陷阱的方法一实施例流程示意 图；
图 3是上述实施例中 HLR与 MSC/VLR协作支持拦截语音呼叫前转功 能的 REGNOT流程示意图；
图 4是上述实施例中 HLR与 MSC/VLR协作支持拦截语音呼叫前转功 能的 QUALREQ流程示意图；
图 5 是上述实施例中 HLR和 MSC/VLR协作支持拦截语音呼叫前转功 能的 QUALDIR流程示意图；
图 6是上述实施例中从被叫 HLR获取被叫用户前转信息； 根据签约信 息以及前转信息控制主叫用户的语音呼叫的一种实施方式流程示意图； 图 7是基于图 6所示实施方式的 HLR与 MSC/VLR协作支持拦截语音 呼叫前转功能的 LOCREQ流程示意图；
图 8是上述实施例中从被叫 HLR获取被叫用户前转信息； 根据签约信 息以及前转信息控制主叫用户的语音呼叫的另一种实施方式流程示意图； 图 9是基于图 8所示实施方式的 MSC/VLR间协作支持拦截语音呼叫前 转功能的 REDREQ流程示意图；
图 10是上述实施例中从被叫 HLR获取被叫用户前转信息； 根据签约 信息以及前转信息控制主叫用户的语音呼叫的又一种实施方式流程示意 图；
图 11是基于图 10所示实施方式的 HLR和 MSC/VLR协作支持拦截语 音呼叫前转功能激活、去活或者修改拦截授权能力的的 FEATREQ流程示意 图；
图 12是基于图 10所示实施方式的 HLR和 MSC/VLR协作支持拦截语 音呼叫前转功能的暂态激活或者去活 FEATREQ流程图；
图 13是本发明主叫侧预防语音呼叫前转陷阱的 MSC—实施例结构程 示意图；
图 14是本发明主叫侧预防语音呼叫前转陷阱的 MSC—实施例中前转 控制模块一种结构程示意图；
图 15是本发明主叫侧预防语音呼叫前转陷阱的 MSC—实施例中前转 控制模块另一种结构程示意图；
图 16是本发明主叫侧预防语音呼叫前转陷阱的 MSC—实施例中前转 控制模块又一种结构程示意图；
图 17是本发明主叫侧预防语音呼叫前转陷阱的系统一实施例结构示意 图。 具体实施方式
本发明实施例解决方案主要是通过 HLR提供用户拦截语音呼叫前转功 能签约信息， 当用户进行语音呼叫时， MSC/VLR根据从 HLR获取用户拦 截语音呼叫前转功能签约信息以及用户的拨号方式在主叫侧控制该用户的 语音呼叫前转以避免前转陷阱， 提高用户使用安全性。 本发明实施例运行环境涉及基于 N07 网络的核心网， 如图 1 所示的
N07 网络结构图中， MT (移动终端 )通过无线网络接入至核心网； MSC ( Mobile Switching Center,移动交换中心 )、 VLR ( Visitor Location Register, 拜访位置寄存器）、 HLR( Home Location Register,归属位置寄存器）与 AUC (鉴权中心） 均为 N07网络中核心网的标准网元， MSC是移动交换中心， 负责呼叫、 接续用户， VLR是拜访位置寄存器， 用于临时存储用户的签约 信息， HLR是归属位置寄存器， 用于永久保存用户的签约信息以及实时保 存用户的位置信息； 核心网网元 MSC、 VLR和 HLR之间通过 N07信令网 络进行通讯。
如图 2所示， 本发明一实施例提出一种基于上述网络结构、 联合 HLR 及 MSC/VLR的主叫侧预防语音呼叫前转陷阱的方法， 包括：
步驟 S101 , 主叫 MSC从主叫 HLR获取拦截语音呼叫前转功能签约信 本实施例中 HLR提供用户级拦截语音呼叫前转签约功能， 用户可以选 择授权开启该功能， 并明确是暂时性开启 /关闭， 还是永久性开启 /关闭； 同 时 HLR还提供拦截语音呼叫前转功能激活 /去活稳态和暂态补充业务码，以 便用户可以自主开启或关闭该功能， 或者呼叫时临时激活 /去活拦截语音呼 叫前转功能。
用户可以通过移动终端向 HLR注册登记签约拦截语音呼叫前转功能， 也可通过营业服务台办理此项功能， HLR将保存用户登记的拦截语音呼叫 前转功能签约信息， 该签约信息包括： 主叫用户是否授权开启或关闭拦截 语音呼叫前转功能以及授权能力信息； 授权能力信息包括暂时性开启或关 闭、 永久性开启或关闭、 临时激活或去活拦截语音呼叫前转功能。 同时， 在用户开机或其他场景时， HLR在服务项目清单（Profile )或者扩展的其 它参数中正确携带这些签约信息给 MSC/VLR, 通知 MSC/VLR用户的拦截 语音呼叫前转功能签约信息， 实时保持与 MSC/VLR签约信息的同步。 本实施例用户做主叫用户，主叫 MSC结合 VLR从主叫 HLR获取主叫 用户的拦截语音呼叫前转功能签约信息并保存， 主叫 MSC从主叫 HLR获 取主叫用户拦截语音呼叫前转功能签约信息的方式包括： 主叫 MSC/VLR 向主叫 HLR发起登记通知（ REGNOT )或资格申请（ QUALREQ ), 或者主 叫 HLR主动向主叫 MSC/VLR发起资格指令（QUALDIR )。
步驟 S102,从被叫 HLR获取被叫用户前转信息； 根据签约信息和前转 信息控制主叫用户的语音呼叫。
在本实施例中， 当主叫用户拨打被叫号码时， 若基于该被叫号码发生 了前转， 或者将要去获取前转号码时， 主叫 MSC结合 VLR根据主叫用户 的拨号方式以及保存的用户的拦截语音呼叫前转功能签约情况进行拦截 , 在主叫侧控制用户的语音呼叫前转， 实现对语音呼叫前转永久性拦截、 永 久性不拦截； 或者临时拦截或不拦截本次通话过程中的语音呼叫前转等。
主叫用户的拨号方式包括普通拨号方式和特殊拨号方式， 特殊拨号方 式是指用户所拨数字中携带有暂态激活或去活语音呼叫前转业务码加被叫 号码。
在本实施例中， 依照 CDMA 41D协议， 主叫 HLR通知主叫 MSC/VLR 用户的拦截语音呼叫前转功能签约信息即主叫 MSC/VLR获取主叫用户拦 截语音呼叫前转功能签约信息涉及 REGNOT、 QUALDIR和 QUALREQ三 种应用场景， 分别对应图 3、 图 4以及图 5。
如图 3所示， 为主叫 HLR与主叫 MSC/VLR协作支持拦截语音呼叫前 转功能的 REGNOT (登记通知 ) 流程图。
假设登记的主叫用户在主叫 HLR授权拦截语音呼叫前转功能， 并且开 启激活， 其流程如下：
步驟 21 , 主叫 HLR接收到主叫 VLR-1的登记通知消息 REGNOT; 步驟 22, 主叫 HLR发现当前用户在主叫 VLR-2登记， 向主叫 VLR-2 发送取消登记消息；
步驟 23 , 主叫 VLR-2返回响应消息；
步驟 24, 主叫 HLR发现用户签约拦截语音呼叫前转功能， 在服务项目 清单 （Profile ) 中正确携带这些签约信息给主叫 VLR-1 , 主叫 VLR-1将该 签约信息保存起来。
如图 4所示， 为主叫 HLR与主叫 MSC/VLR协作支持拦截语音呼叫前 转功能的 QUALREQ (资格申请） 流程图。
假设登记的主叫用户在主叫 HLR授权拦截语音呼叫前转功能， 并且开 启激活， 其流程如下：
步驟 31 , 主叫 HLR接收到主叫 VLR的资格申请消息 QUALREQ。 步驟 32, 主叫 HLR发现用户签约拦截语音呼叫前转功能，在服务项目 清单（Profile ) 中正确携带这些签约信息给主叫 VLR, 主叫 VLR将该签约 信息保存起来。
如图 5所示， 为主叫 HLR与主叫 MSC/VLR协作支持拦截语音呼叫前 转功能的 QUALDIR (资格指令） 流程图。
假设登记的主叫用户在主叫 HLR授权拦截语音呼叫前转功能， 并且开 启激活， 其流程如下：
步驟 41 , 主叫 HLR发现用户签约拦截语音呼叫前转功能，在服务项目 清单 （Profile ) 中正确携带这些签约信息给主叫 VLR;
步驟 42, 主叫 VLR将该签约信息保存起来， 主叫 VLR返回 qualdir资 格指令响应消息给主叫 HLR。
如图 6所示， 作为语音呼叫前转控制的一种实施方式， 上述步驟 S102 具体可以包括：
步驟 S1021 , 当主叫用户发起语音呼叫时， 主叫 MSC向被叫 HLR发 起位置申请消息；
步驟 S1022, 接收被叫 HLR返回的携带有前转指示以及目的号码的位 置申请响应消息；
步驟 S1023, 当前转指示为被叫前转时，从签约信息中获取主叫用户是 否开启拦截语音呼叫前转功能， 若是， 则进入步驟 S1024; 否则， 进入步驟 S1025;
主叫 MSC从主叫 VLR中获取主叫用户是否开启拦截语音呼叫前转功
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步驟 S1024, 终止呼叫， 释放目的号码；
步驟 S1025, 接续至目的号码。
如图 7所示， 作为上述图 6所示实施方式的 LOCREQ应用场景， 具体 为被叫 HLR和主叫 MSC/VLR协作支持拦截语音呼叫前转功能的 LOCREQ (位置申请） 流程如下：
步驟 51 ,被叫 HLR接收到主叫 MSC1发起的位置申请 LOCREQ消息； 步驟 52,被叫 HLR如果发现是局间呼叫， 向被叫用户登记的 VLR2发 送路由申请 ROUTREQ , 否则转步驟 54;
步驟 53, VLR2向被叫 HLR返回路由数字 TLDN;
步驟 54, 被叫 HLR按照现有 41D协议判断被叫用户满足前转条件， 返回位置申请响应消息给主叫 MSC1 , 如果被叫 HLR直接判断出发生前转 时， 会携带前转指示给主叫 MSC1。
步驟 55,主叫 MSC1从主叫 VLR中获取主叫是否开启拦截语音呼叫前 转功能， 如果开启， 则终止呼叫， 如果未开启拦截， 则继续接续至前转号 码。
如图 8所示，作为语音呼叫前转控制的另一种实施方式，上述步驟 S102 具体可以包括： 步驟 S1026, 当主叫用户发起语音呼叫时， 主叫 MSC向被叫 HLR发 起位置申请消息；
步驟 S1027, 接收被叫 HLR返回的携带有路由选择信息的位置申请响 应消息；
步驟 S1028, 根据位置申请响应消息建立至被叫 MSC的话音通路； 步驟 S1029, 当被叫用户忙或无应答且被叫用户激活呼叫前转能力时， 接收被叫 MSC发送的携带有改向再呼原因的改向再呼申请消息；
步驟 S1030,从签约信息中获取主叫用户是否开启拦截语音呼叫前转功 能， 若是， 则进入步驟 S1031; 否则， 进入步驟 S1032;
主叫 MSC从主叫 VLR中获取主叫用户是否开启拦截语音呼叫前转功
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步驟 S 1031 , 终止呼叫；
步驟 S1032, 向被叫 HLR发送前转号码申请消息， 获取对应的前转号 码。
如图 9所示， 作为上述图 8所示实施方式的 LOCREQ、 REDREQ应用 场景，具体为主叫 MSC/VLR间协作支持拦截语音呼叫前转功能的 REDREQ 流程如下：
步驟 61 ,被叫 HLR接收到主叫 MSC1发起的位置申请 LOCREQ消息； 步驟 62,被叫 HLR如果发现是局间呼叫， 向被叫用户登记的 VLR2发 送路由申请消息 ROUTREQ, 否则转步驟 65;
步驟 63, 被叫 VLR2向被叫 MSC2发送路由申请消息 ROUTREQ; 步驟 64, 被叫 MSC2分配一个 TLDN (临时本地电话薄号码 )并在路 由响应消息 routreq中向被叫 VLR2返回路由数字 TLDN;
步驟 65, 被叫 VLR2向被叫 HLR返回路由数字 TLDN;
步驟 66, 被叫 HLR按照现有 41D协议， 返回 locreq位置申请响应消 息给主叫 MSC1 , 其中包括以终端列表参数形式的路由选择信息； 步驟 67, 主叫 MSC1根据收到的 locreq, 始发 MSC1采用由 7号信令 规定的规程建立至被叫 MSC2的话音通路；
步驟 68, 被叫 MSC2收到主叫 MSC1之间的呼叫后， 寻呼被叫用户， 如果收到寻呼响应， 接着振铃。 如果被叫用户没有响应寻呼或振铃后没有 应答或者用户忙， 被叫 MSC2根据被叫服务项目清单（ Profile )确定在无寻 呼应答或无寻呼响应状态或忙时被叫用户激活了呼叫前转能力；
步驟 69, 被叫 MSC2向主叫始发 MSC1发送一个改向再呼申请消息 ( REDREQ ), 指示由于无寻呼响应或无应答或忙导致的呼叫前转；
步驟 70,主叫 MSC1从主叫 VLR中获取主叫是否开启拦截语音呼叫前 转功能， 如果开启， 则终止呼叫， 同时给主叫号码放音提示， 如果未开启 拦截， 则主叫始发 MSC1 继续向被叫 HLR 发送前转号码申请消息 ( TRANUMREQ ) , 申请呼叫前转号码。
如图 10 所示， 作为语音呼叫前转控制的又一种实施方式， 上述步驟 S102具体可以包括：
步驟 S1033 ,当主叫用户提供拦截语音呼叫前转功能暂态激活或去活补 充业务码时， 主叫 MSC向主叫 HLR发起携带有拨号数字的补充业务申请 消息；
步驟 S1034, 接收主叫 HLR根据补充业务申请消息以及签约信息返回 的携带有拦截语音呼叫前转扩展字段信息的补充业务申请响应消息；
步驟 S1035 , 根据补充业务申请响应消息并通过被叫 HLR向被叫用户 发起呼叫；
步驟 S1036,从补充业务申请响应消息中获取主叫用户是否开启拦截语 音呼叫前转功能； 若是， 则进入步驟 S1037; 否则进入步驟 S1038;
步驟 S 1037, 终止呼叫； 步驟 S1038, 接续至前转号码或获取前转号码。
如图 11所示， 依照 CDMA 41D协议， 基于上述图 10所示实施方式， HLR支持用户自主通过补充业务码修改当前个人拦截语音呼叫前转功能签 约状况所涉及的 FEATREQ应用场景，假设当前被叫用户授权拦截语音呼叫 前转签约功能， 具体流程如下：
步驟 71 , 主叫 MSC向主叫 HLR发起补充业务申请消息（FEATREQ ), 该消息中包括拨号数字。
步驟 72,主叫 HLR如果发现用户所拨数字中只携带激活或者去活拦截 语音呼叫前转功能补充业务码,， 比如为 *111 , 主叫 HLR正确保存主叫用户 拦截语音呼叫前转功能签约信息进用户数据库；
步驟 73, 主叫 HLR送发资格指令消息（QUALDIR ), 在服务项目清单 ( Profile ) 中将最新的拦截语音呼叫前转功能签约信息携带给主叫 MSC; 步驟 74, 主叫 MSC将该签约信息保存起来， 主叫 MSC返回 qualdir 响应消息给主叫 HLR。
如图 12所示， 依照 CDMA 41D协议， 基于上述图 10所示实施方式， HLR 支持用户自主暂态激活或者去活拦截语音呼叫前转功能， MSC/VLR 配合完成临时拦截或者不拦截本次通话过程中的语音呼叫前转所涉及的 FEATREQ (业务申请）应用场景， 假设当前被叫用户授权拦截语音呼叫前 转签约功能， 且提供拦截语音呼叫前转功能暂态激活或者去活补充业务码， 其具体流程如下：
步驟 81 , 主叫 MSC1 向与当前被叫 HLR 发起补充业务申请消息 ( FEATREQ ), 该消息中包括拨号数字。
步驟 82,主叫 HLR如果发现用户所拨数字中携带暂态激活或者去活拦 截语音呼叫前转功能补充业务码和被叫用户号码， 如 *110#13888888888, 且当前被叫用户授权拦截语音呼叫前转签约功能， 并开启该功能暂态激活 或者去活权限， 则在 featreq响应消息中携带扩展字段， 对应指示是否开启 拦截语音呼叫前转功能， 其它参数按照 CDMA 41D协议规定正确携带， 返 回给主叫 MSC1;
步驟 83,主叫 MSC1发现 featreq响应消息中指示中有进行拦截语音呼 叫前转扩展字段， 进行保存；
步驟 84,主叫 MSC1发起对被叫号码的呼叫，基于被叫号码发生前转， 流程类似图 7步驟 51至步驟 54或者图 9步驟 61至步驟 69;
步驟 85,主叫 MSC1获取之前保存的从 featreq响应消息中得到的拦截 语音呼叫前转扩展字段信息， 如果需要拦截， 则终止呼叫， 同时给主叫号 码放音提示， 如果不需要拦截， 则放行， 接续到响应前转号码或者去获取 前转号码。
综上所述， 本实施例通过归属位置寄存器（HLR )和移动交换中心 /拜 访位置寄存器（MSC/VLR )设备联合协作， 提供了一套完整的主叫侧主动 解决语音呼叫前转陷阱的方法， 可以最大限度主动保护移动用户不掉入语 音呼叫前转陷阱。 而且对现有系统性能没有影响， 只需对现有系统进行简 单开发改造升级， 不会增加系统负荷， 充分利用现有资源， 节约成本， 并 极大提高客户满意度， 更有利于业务的推广。
如图 13所示， 本发明一实施例提出一种主叫侧预防语音呼叫前转陷阱 的 MSC, 包括： 签约信息获取模块 701以及前转控制模块 702, 其中： 签约信息获取模块 701 , 设置为从主叫 HLR获取拦截语音呼叫前转功 能签约信息；
前转控制模块 702, 设置为从被叫 HLR获取被叫用户前转信息； 根据 签约信息和前转信息控制主叫用户的语音呼叫。
本实施例中 HLR提供用户级拦截语音呼叫前转签约功能， 用户可以选 择授权开启该功能， 并明确是暂时性开启 /关闭， 还是永久性开启 /关闭； 同 时 HLR还提供拦截语音呼叫前转功能激活 /去活稳态和暂态补充业务码，以 便用户可以自主开启或关闭该功能， 或者呼叫时临时激活 /去活拦截语音呼 叫前转功能。
用户可以通过移动终端向 HLR注册登记签约拦截语音呼叫前转功能， 也可通过营业服务台办理此项功能， HLR将保存用户登记的拦截语音呼叫 前转功能签约信息， 该签约信息包括： 主叫用户是否授权开启或关闭拦截 语音呼叫前转功能以及授权能力信息； 授权能力信息包括暂时性开启或关 闭、 永久性开启或关闭、 临时激活或去活拦截语音呼叫前转功能。 同时， 在用户开机或其他场景时， HLR在服务项目清单（Profile )或者扩展的其 它参数中正确携带这些签约信息给 MSC/VLR, 通知 MSC/VLR用户的拦截 语音呼叫前转功能签约信息， 实时保持与 MSC/VLR签约信息的同步。
本实施例用户做主叫用户， 主叫 MSC结合 VLR具体通过签约信息获 取模块 701从主叫 HLR获取主叫用户的拦截语音呼叫前转功能签约信息并 保存， 主叫 MSC从主叫 HLR获取主叫用户拦截语音呼叫前转功能签约信 息的方式包括： 主叫 MSC/VLR向主叫 HLR发起登记通知（ REGNOT )或 资格申请（QUALREQ ), 或者主叫 HLR主动向主叫 MSC/VLR发起资格指 令 ( QUALDIR )0
当主叫用户拨打被叫号码时， 若基于该被叫号码发生了前转， 或者将 要去获取前转号码时， 主叫 MSC结合 VLR具体通过前转控制模块 702根 据主叫用户的拨号方式以及保存的用户的拦截语音呼叫前转功能签约情况 进行拦截， 在主叫侧控制用户的语音呼叫前转， 实现对语音呼叫前转永久 性拦截、 永久性不拦截； 或者临时拦截或不拦截本次通话过程中的语音呼 叫前转等。
主叫用户的拨号方式包括普通拨号方式和特殊拨号方式， 特殊拨号方 式是指用户所拨数字中携带有暂态激活或去活语音呼叫前转业务码加被叫 号码。
如图 14所示， 作为前转控制的一种实施方式， 前转控制模块 702具体 可以包括： 第一发送单元 7021、 第一接收单元 7022、 第一获取单元 7023 以及第一前转控制单元 7024, 其中：
第一发送单元 7021 , 设置为当主叫用户发起语音呼叫时， 向被叫 HLR 发起位置申请消息；
第一接收单元 7022,设置为接收被叫 HLR返回的携带有前转指示以及 目的号码的位置申请响应消息；
第一获取单元 7023, 设置为当前转指示为被叫前转时， 从签约信息中 获取主叫用户是否开启拦截语音呼叫前转功能；
第一前转控制单元 7024, 设置为当当前转指示为被叫前转且主叫用户 开启拦截语音呼叫前转功能时， 终止呼叫， 释放目的号码； 否则， 接续至 目的号码。
如图 15所示， 作为前转控制的另一种实施方式， 前转控制模块 702具 体可以包括： 第二发送单元 7025、 第二接收单元 7026、 第一呼叫建立单元 7027、 第二获取单元 7028以及第二前转控制单元 7029, 其中：
第二发送单元 7025, 设置为当主叫用户发起语音呼叫时， 向被叫 HLR 发起位置申请消息；
第二接收单元 7026,设置为接收被叫 HLR返回的携带有路由选择信息 的位置申请响应消息； 以及当建立与被叫 MSC的话音通路后、 被叫用户忙 或无应答且被叫用户激活呼叫前转能力时，接收被叫 MSC发送的携带有改 向再呼原因的改向再呼申请消息；
第一呼叫建立单元 7027, 设置为根据位置响应消息建立至被叫 MSC 的话音通路；
第二获取单元 7028, 设置为从签约信息中获取主叫用户是否开启拦截 语音呼叫前转功能；
第二前转控制单元 7029, 设置为当主叫用户开启拦截语音呼叫前转功 能时， 终止呼叫； 否则， 向被叫 HLR发送前转号码申请消息， 获取对应的 前转号码。
如图 16所示， 作为前转控制的又一种实施方式， 前转控制模块 702具 体可以包括： 第三发送单元 7030、 第三接收单元 7031、 第二呼叫建立单元 7032、 第三获取单元 7033以及第三前转控制单元 7034, 其中：
第三发送单元 7030, 设置为当主叫用户提供拦截语音呼叫前转功能暂 态激活或去活补充业务码时， 向主叫 HLR发起携带有拨号数字的补充业务 申请消息；
第三接收单元 7031 ,设置为接收主叫 HLR根据补充业务申请消息以及 签约信息返回的携带有拦截语音呼叫前转扩展字段信息的补充业务申请响 应消息；
第二呼叫建立单元 7032, 设置为根据补充业务响应消息并通过被叫 HLR向被叫用户发起呼叫；
第三获取单元 7033 , 设置为当被叫用户发生前转时， 从补充业务申请 消息中获取主叫用户是否开启拦截语音呼叫前转功能；
第三前转控制单元 7034, 设置为当主叫用户开启拦截语音呼叫前转功 能时， 终止呼叫； 否则， 接续至前转号码或获取前转号码。
如图 17所示， 本发明一实施例提出一种主叫侧预防语音呼叫前转陷阱 的系统， 包括： HLR1101以及 MSC/VLR1102, 其中：
HLR1101设置为注册用户拦截语音呼叫前转功能签约信息；
MSC/VLR1102,设置为从 HLR1101获取用户拦截语音呼叫前转功能签 约信息， 从被叫 HLR获取被叫用户前转信息； 并根据签约信息和前转信息 控制用户的语音呼叫。 本发明实施例主叫侧预防语音呼叫前转陷阱的方法、 MSC及系统， 使 用 HLR提供用户级语音呼叫前转签约功能， 并将 HLR与 MSC/VLR联合， 一旦主叫用户签约该功能， 拨打其它号码时， 如果基于该被叫号码发生了 前转或者将发生前转， 主叫 MSC/VLR发现主叫用户签约语音呼叫前转拦 截， 则主动终止呼叫， 不进行接续， 避免了语音呼叫前转陷阱， 提高主叫 用户语音呼叫的安全性； 同时， HLR还提供临时开启或者越过拦截语音呼 叫前转功能， 方便该业务的应用推广。 本发明对于核心网网元 HLR 和 MSC/VLR改造很小， 易于实现， 充分利用现有网络资源， 节约成本。
以上所述仅为本发明的优选实施例， 并非因此限制本发明的专利范围 , 凡是利用本发明说明书及附图内容所作的等效结构或流程变换， 或直接或 间接运用在其它相关的技术领域， 均同理包括在本发明的专利保护范围内。

Claims

权利要求书
1、 一种主叫侧预防语音呼叫前转陷阱的方法， 其中， 该方法包括： 主叫移动交换中心 MSC从主叫归属位置寄存器 HLR获取拦截语音呼 叫前转功能签约信息；
从被叫 HLR获取被叫用户前转信息； 根据所述签约信息和前转信息控 制主叫用户的语音呼叫。
2、根据权利要求 1所述的主叫侧预防语音呼叫前转陷阱的方法，其中， 所述签约信息包括： 主叫用户是否授权开启或关闭拦截语音呼叫前转 功能以及授权能力信息；
所述授权能力信息包括暂时性开启或关闭、 永久性开启或关闭、 临时 激活或去活拦截语音呼叫前转功能。
3、根据权利要求 2所述的主叫侧预防语音呼叫前转陷阱的方法，其中， 所述主叫 MSC从主叫 HLR获取拦截语音呼叫前转功能签约信息为： 主叫 MSC/VLR向主叫 HLR发起登记通知或资格申请，或者所述主叫 HLR向主 叫 MSC/VLR发起资格指令。
4、根据权利要求 3所述的主叫侧预防语音呼叫前转陷阱的方法，其中， 所述从被叫 HLR获取被叫用户前转信息； 根据所述签约信息和前转信息控 制主叫用户的语音呼叫为：
当主叫用户发起语音呼叫时， 所述主叫 MSC向被叫 HLR发起位置申 请消息；
接收所述被叫 HLR返回的携带有前转指示以及目的号码的位置申请响 应消息；
所述前转指示为被叫前转时， 从所述签约信息中获取主叫用户是否开 启拦截语音呼叫前转功能， 若是， 则终止呼叫， 释放所述目的号码； 否则， 接续至所述目的号码。
5、根据权利要求 3所述的主叫侧预防语音呼叫前转陷阱的方法，其中， 所述从被叫 HLR获取被叫用户前转信息； 根据所述签约信息和前转信息控 制主叫用户的语音呼叫为：
当主叫用户发起语音呼叫时， 所述主叫 MSC向被叫 HLR发起位置申 请消息；
接收所述被叫 HLR返回的携带有路由选择信息的位置申请响应消息； 根据所述位置申请响应消息建立至被叫 MSC的话音通路；
被叫用户忙或无应答且被叫用户激活呼叫前转能力时， 接收被叫 MSC 发送的携带有改向再呼原因的改向再呼申请消息；
从所述签约信息中获取主叫用户是否开启拦截语音呼叫前转功能， 若 是， 则终止呼叫； 否则， 向被叫 HLR发送前转号码申请消息， 获取对应的 前转号码。
6、根据权利要求 3所述的主叫侧预防语音呼叫前转陷阱的方法，其中， 所述从被叫 HLR获取被叫用户前转信息； 根据签约信息和前转信息控制主 叫用户的语音呼叫为：
当主叫用户提供拦截语音呼叫前转功能暂态激活或去活补充业务码 时， 主叫 MSC向主叫 HLR发起携带有拨号数字的补充业务申请消息； 接收所述主叫 HLR根据所述补充业务申请消息以及签约信息返回的携 带有拦截语音呼叫前转扩展字段信息的补充业务申请响应消息；
根据所述补充业务申请响应消息并通过被叫 HLR 向被叫用户发起呼 叫；
被叫用户发生前转时， 从所述补充业务申请响应消息中获取主叫用户 是否开启拦截语音呼叫前转功能； 若是， 则终止呼叫； 否则， 接续至前转 号码或获取前转号码。
7、 一种主叫侧预防语音呼叫前转陷阱的 MSC, 其中， 该 MSC包括： 签约信息获取模块和前转控制模块； 其中，
所述签约信息获取模块， 设置为从主叫 HLR获取拦截语音呼叫前转功 能签约信息；
所述前转控制模块， 设置为从被叫 HLR获取被叫用户前转信息； 根据 所述签约信息和前转信息控制主叫用户的语音呼叫。
8、根据权利要求 7所述的主叫侧预防语音呼叫前转陷阱的 MSC,其中， 所述主叫 MSC从主叫 HLR获取拦截语音呼叫前转功能签约信息为： 主叫 MSC/VLR向主叫 HLR发起登记通知或资格申请，或者所述主叫 HLR向主 叫 MSC/VLR发起资格指令。
9、 根据权利要求 7或 8所述的主叫侧预防语音呼叫前转陷阱的 MSC, 其中， 所述前转控制模块包括： 第一发送单元、 第一接收单元、 第一获取 单元和第一前转控制单元； 其中，
所述第一发送单元， 设置为当主叫用户发起语音呼叫时， 向被叫 HLR 发起位置申请消息；
所述第一接收单元， 设置为接收所述被叫 HLR返回的携带有前转指示 以及目的号码的位置申请响应消息；
所述第一获取单元， 设置为当所述前转指示为被叫前转时， 从所述签 约信息中获取主叫用户是否开启拦截语音呼叫前转功能；
所述第一前转控制单元， 设置为当所述前转指示为被叫前转且主叫用 户开启拦截语音呼叫前转功能时， 终止呼叫， 释放所述目的号码； 否则， 接续至所述目的号码。
10、根据权利要求 7或 8所述的主叫侧预防语音呼叫前转陷阱的 MSC, 其中， 所述前转控制模块包括： 第二发送单元、 第二接收单元、 第一呼叫 建立单元、 第二获取单元和第二前转控制单元； 其中，
所述第二发送单元， 设置为当主叫用户发起语音呼叫时， 向被叫 HLR 发起位置申请消息；
所述第二接收单元， 设置为接收所述被叫 HLR返回的携带有路由选择 信息的位置申请响应消息； 以及当建立与被叫 MSC的话音通路后、 被叫用 户忙或无应答且被叫用户激活呼叫前转能力时，接收被叫 MSC发送的携带 有改向再呼原因的改向再呼申请消息；
所述第一呼叫建立单元， 设置为根据所述位置申请响应消息建立至被 叫 MSC的话音通路；
所述第二获取单元， 设置为从所述签约信息中获取主叫用户是否开启 拦截语音呼叫前转功能；
所述第二前转控制单元， 设置为当主叫用户开启拦截语音呼叫前转功 能时， 终止呼叫； 否则， 向被叫 HLR发送前转号码申请消息， 获取对应的 前转号码。
11、根据权利要求 7或 8所述的主叫侧预防语音呼叫前转陷阱的 MSC, 其中， 所述前转控制模块包括： 第三发送单元、 第三接收单元、 第二呼叫 建立单元、 第三获取单元和第三前转控制单元； 其中，
所述第三发送单元， 设置为当主叫用户提供拦截语音呼叫前转功能暂 态激活或去活补充业务码时， 向主叫 HLR发起携带有拨号数字的补充业务 申请消息；
所述第三接收单元， 设置为接收所述主叫 HLR根据所述补充业务申请 消息以及签约信息返回的携带有拦截语音呼叫前转扩展字段信息的补充业 务申请响应消息；
所述第二呼叫建立单元， 设置为根据所述补充业务响应消息并通过被 叫 HLR向被叫用户发起呼叫；
所述第三获取单元， 设置为当被叫用户发生前转时， 从所述补充业务 申请响应消息中获取主叫用户是否开启拦截语音呼叫前转功能； 所述第三前转控制单元， 设置为当主叫用户开启拦截语音呼叫前转功 能时， 终止呼叫； 否则， 接续至前转号码或获取前转号码。
12、 一种主叫侧预防语音呼叫前转陷阱的系统， 其中， 该系统包括：
HLR以及 MSC/VLR; 其中，
所述所述 HLR, 设置为注册用户拦截语音呼叫前转功能签约信息； 所述 MSC/VLR, 设置为从所述 HLR获取用户拦截语音呼叫前转功能 签约信息， 从被叫 HLR获取被叫用户前转信息； 并根据所述签约信息和前 转信息控制所述用户的语音呼叫。
13、 根据权利要求 12所述的主叫侧预防语音呼叫前转陷阱的系统， 其 中， 所述 MSC包括： 签约信息获取模块和前转控制模块； 其中，
所述签约信息获取模块， 设置为从主叫 HLR获取拦截语音呼叫功能前 转签约信息；
所述前转控制模块， 设置为从被叫 HLR获取被叫用户前转信息； 根据 所述签约信息和前转信息控制主叫用户的语音呼叫。
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