CN105813035B - Method, system and network equipment for identifying secret voice service - Google Patents
Method, system and network equipment for identifying secret voice service Download PDFInfo
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- CN105813035B CN105813035B CN201410843013.5A CN201410843013A CN105813035B CN 105813035 B CN105813035 B CN 105813035B CN 201410843013 A CN201410843013 A CN 201410843013A CN 105813035 B CN105813035 B CN 105813035B
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Abstract
the invention discloses a method for identifying a secret voice service, which comprises the following steps: when the call is in progress, the calling mobile terminal sends a message carrying the information of the confidential voice service type to the MSC; the message carrying the confidential voice service type information is used for the MSC to send the service information containing the confidential voice service type information to the AS, so that the AS determines that the call is an encrypted call according to the confidential voice service type information. The invention also discloses a system and network equipment for realizing the method.
Description
Technical Field
the invention relates to the technical field of information security of mobile communication systems, in particular to a method, a system and network equipment for identifying a confidential voice service.
background
The end-to-end encrypted call is divided into two types according to the mode of initiating the encrypted call service: one is to initiate the call in a secret way, the other is to initiate the call in an open way, and the open way and the secret way are switched after the call. The latter is the in-band end-to-end encrypted call.
in the prior art, a TD-SCDMA encryption mobile phone uses an in-band end-to-end key agreement mode to perform encryption communication. The procedure of originating the secret call is completely consistent with the procedure of originating the public call, and the called number and the service type parameter carried by the signaling of calling the secret call are also completely consistent with the content carried by the signaling of calling the public call, so the operator network can not distinguish whether a call is the public call or the secret call.
disclosure of Invention
in order to solve the existing technical problem, embodiments of the present invention provide a method, a system, and a network device for recognizing a secure voice service.
the embodiment of the invention provides a method for identifying a secret voice service, which comprises the following steps:
When the call is in progress, the calling mobile terminal sends a message carrying the information of the confidential voice service type to the MSC;
The message carrying the confidential voice service type information is used for the MSC to send the service information containing the confidential voice service type information to an Application Server (AS), so that the AS determines the call AS an encrypted call according to the confidential voice service type information.
wherein, the message carrying the secret voice service type information at least comprises: connection Setup (Setup) signaling and connection management Request (CM Request) signaling.
Wherein the secure voice service type is indicated by a default supplementary service code.
the embodiment of the invention also provides a method for identifying the confidential voice service, which comprises the following steps:
When the call is in progress, after receiving a message carrying the confidential voice service type information sent by a calling mobile terminal, the MSC sends the service information containing the confidential voice service type information to the AS;
And the service information is used for the AS to determine that the call is an encrypted call.
in one embodiment, after the secure voice service is opened by the mobile terminal, the method further comprises:
MSC stores the number of the mobile terminal which has opened the secret voice service and is sent by AS;
after detecting the call initiated by the mobile terminal with the opened secret voice service, the MSC sends the service information containing the secret voice service type information to the AS.
the embodiment of the invention also provides a method for identifying the confidential voice service, which comprises the following steps:
when a call is in progress, the AS receives service information which is sent by the MSC and contains the confidential voice service type information, and determines that the call is an encrypted call according to the confidential voice service type information;
wherein, the information of the type of the secret voice service is carried in the message sent to the MSC by the calling mobile terminal.
In one embodiment, after the secure voice service is opened by the mobile terminal, the method further comprises:
the AS sends the number of the mobile terminal with the opened security voice service to the MSC for storage;
the number of the mobile terminal with the opened security voice service is used for the MSC to detect whether the mobile terminal initiating the call is the mobile terminal with the opened security voice service.
an embodiment of the present invention further provides a mobile terminal, where the mobile terminal includes: a configuration module and a sending module; wherein the content of the first and second substances,
The configuration module is used for carrying the information of the confidential voice service type in the message sent to the MSC when the call is in progress and forwarding the information to the sending module;
The sending module is used for sending the message which is forwarded by the configuration module and carries the information of the secret voice service type to the MSC;
The message carrying the confidential voice service type information is used for the MSC to send the service information containing the confidential voice service type information to an Application Server (AS), so that the AS determines the call AS an encrypted call according to the confidential voice service type information.
an embodiment of the present invention further provides an MSC, where the MSC includes: the device comprises a receiving module and a sending module; wherein, when the call is in progress,
The receiving module is used for triggering the sending module after receiving the message which is sent by the calling mobile terminal and carries the confidential voice service type information;
the sending module is used for sending the service information containing the confidential voice service type information to the AS after being triggered by the receiving module;
And the service information is used for the AS to determine that the call is an encrypted call.
in one embodiment, the MSC further comprises: a storage module; after the secure voice service is opened by the mobile terminal,
The storage module is used for storing the number of the mobile terminal which has opened the secret voice service and is sent by the AS; accordingly, the method can be used for solving the problems that,
the receiving module is further configured to send the number of the mobile terminal, which is sent by the AS and has opened the secure voice service, to the storage module; the mobile terminal is also used for triggering the sending module after detecting the call initiated by the mobile terminal with the opened secret voice service;
The sending module is further configured to send service information including the confidential voice service type information to the AS.
The embodiment of the invention also provides an application server AS, which comprises: the device comprises a receiving module and a processing module; wherein, when the call is in progress,
the receiving module is used for receiving the service information which is sent by the MSC and contains the confidential voice service type information, and sending the service information to the processing module;
The processing module is used for determining the call as an encrypted call according to the confidential voice service type information;
wherein, the information of the type of the secret voice service is carried in the message sent to the MSC by the calling mobile terminal.
in one embodiment, the AS further comprises: a sending module; after the secure voice service is opened by the mobile terminal,
The sending module is used for sending the number of the mobile terminal with the opened security voice service to the MSC;
The number of the mobile terminal with the opened security voice service is used for the MSC to detect whether the mobile terminal initiating the call is the mobile terminal with the opened security voice service.
The embodiment of the invention also provides a system for identifying the secret voice service, which comprises the following steps: the mobile terminal, MSC and AS described above.
According to the method, the system and the network equipment for identifying the confidential voice service, provided by the embodiment of the invention, when a call is in progress, a calling mobile terminal sends a message carrying confidential voice service type information to a Mobile Switching Center (MSC); the message carrying the confidential voice service type information is used for the MSC to send the service information containing the confidential voice service type information to an Application Server (AS), so that the AS determines the call AS an encrypted call according to the confidential voice service type information. The embodiment of the invention solves the problem that the existing operator network can not distinguish the open speech and the secret speech, so that the operator can provide differentiated services for the user according to the user subscription attribute, and the control power of the operator on the service is enhanced. In addition, the MSC synchronizes the service information containing the confidential voice service type information to the AS in a bypass mode, and the MSC has no influence on the voice call flow and has good applicability.
Drawings
In the drawings, which are not necessarily drawn to scale, like reference numerals may describe similar components in different views. Like reference numerals having different letter suffixes may represent different examples of similar components. The drawings illustrate generally, by way of example, but not by way of limitation, various embodiments discussed herein.
FIG. 1 is a flow chart of a method for recognizing a secure voice service according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating a system architecture for recognizing secure voice services according to an embodiment of the present invention;
FIG. 3 is a flow chart illustrating an implementation of a method for recognizing secure voice services according to another embodiment of the present invention;
FIG. 4 is a diagram illustrating a system architecture for recognizing secure voice services according to an embodiment of the present invention;
Fig. 5 is a schematic structural diagram of an MSC according to an embodiment of the present invention;
Fig. 6 is a schematic structural diagram of an AS according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention.
Detailed Description
in the embodiment of the invention, when a call is in progress, a calling mobile terminal sends a message carrying confidential voice service type information to an MSC; the message carrying the confidential voice service type information is used for the MSC to send the service information containing the confidential voice service type information to the AS, so that the AS determines that the call is an encrypted call according to the confidential voice service type information.
The invention is described in further detail below with reference to the figures and the embodiments.
fig. 1 is a flowchart of an implementation of a method for recognizing a secure voice service according to an embodiment of the present invention, as shown in fig. 1, the method includes:
Step 101: when the call is in progress, the calling mobile terminal sends a message carrying the information of the confidential voice service type to the MSC;
step 102: MSC sends the service information containing the confidential voice service type information to AS;
step 103: and the AS determines the call AS an encrypted call according to the confidential voice service type information.
In the embodiment of the present invention, the message carrying the confidential voice service type information at least includes: connection Setup (Setup) signaling and connection management Request (CM Request) signaling. For example: if the calling mobile terminal carries the confidential voice service type information in the Setup signaling, filling a bear capability field information transfer capability in the Setup signaling as the confidential voice service; if the calling mobile terminal carries the confidential voice service type information in the CM Request signaling, the CM service type field is filled as the confidential voice service. Of course, the message carrying the information of the type of the secure voice service may be other messages besides the signaling.
in an embodiment of the present invention, the secure voice service type may be indicated by a default supplementary service code. For example: a value can be selected from the default supplementary service codes SS-Code: '11110000' B to '11111111' B in the 3GPP protocol as the type value of the secure voice service.
in the embodiment of the present invention, the service information sent by the MSC includes: the secret voice service type information further comprises: the numbers of the calling mobile terminal and the called mobile terminal, and the like.
the embodiment of the invention solves the problem that the existing operator network can not distinguish the open speech and the secret speech, so that the operator can provide differentiated services for the user according to the user subscription attribute, and the control power of the operator on the service is enhanced. In addition, the MSC synchronizes the service information containing the confidential voice service type information to the AS in a bypass mode, and the MSC has no influence on the voice call flow and has good applicability.
in one embodiment, the method further comprises: the AS sends the number of the mobile terminal with the opened security voice service to the MSC for storage; accordingly, the method can be used for solving the problems that,
and after detecting the call initiated by the mobile terminal with the opened confidential voice service, the MSC sends the service information containing the confidential voice service type information to the AS. Therefore, the network flow can be saved, the consumption of network resources can be reduced, and the system performance can be improved.
of course, in actual application, the AS may not send the number of the mobile terminal that has opened the secure voice service to the MSC, but send the corresponding service information to the AS only when the MSC receives the call from the mobile terminal (regardless of whether the call is an encrypted call or not).
the embodiment of the invention also provides a method for identifying the confidential voice service, which comprises the following steps:
when the call is in progress, the calling mobile terminal sends a message carrying the information of the confidential voice service type to the MSC;
the message carrying the confidential voice service type information is used for the MSC to send the service information containing the confidential voice service type information to an Application Server (AS), so that the AS determines the call AS an encrypted call according to the confidential voice service type information.
The embodiment of the invention also provides a method for identifying the confidential voice service, which comprises the following steps:
when the call is in progress, after receiving a message carrying the confidential voice service type information sent by a calling mobile terminal, the MSC sends the service information containing the confidential voice service type information to the AS;
and the service information is used for the AS to determine that the call is an encrypted call.
In one embodiment, after the secure voice service is opened by the mobile terminal, the method further comprises:
MSC stores the number of the mobile terminal which has opened the secret voice service and is sent by AS; and after detecting the call initiated by the mobile terminal with the opened confidential voice service, sending the service information containing the confidential voice service type information to the AS.
the embodiment of the invention also provides a method for identifying the confidential voice service, which comprises the following steps:
When a call is in progress, the AS receives service information which is sent by the MSC and contains the confidential voice service type information, and determines that the call is an encrypted call according to the confidential voice service type information;
Wherein, the information of the type of the secret voice service is carried in the message sent to the MSC by the calling mobile terminal.
In one embodiment, after the secure voice service is opened by the mobile terminal, the method further comprises:
the AS sends the number of the mobile terminal with the opened security voice service to the MSC for storage;
the number of the mobile terminal with the opened security voice service is used for the MSC to detect whether the mobile terminal initiating the call is the mobile terminal with the opened security voice service.
In the embodiment of the invention, an AS can be added on the basis of the original voice service system architecture to realize the purpose that a network distinguishes whether a call is an open call or a secret call. The specific architecture is shown in fig. 2. On the network side, the system introduces an AS for realizing the function of distinguishing clear calls, so that an operator can provide differentiated services for users according to the user subscription attributes, and the control power of the operator on services is enhanced.
fig. 3 is a flowchart of a method for recognizing a secure voice service according to another embodiment of the present invention, as shown in fig. 3, including:
Step 301: the calling mobile terminal MSA sends a connection management Request (CM Request) message to the network side, wherein the message can carry secret voice service type information;
step 302: the network side initiates authentication and encryption process with the calling mobile terminal MSA;
step 303: after receiving the service acceptance message or completing encryption, the calling mobile terminal MSA sends a Setup message to the network side (MSC/VLR), where the Setup message may carry the secure voice service type information, and after receiving the Setup message, the network side sends the service information including the secure voice service type information to the AS (the AS shown in fig. 3), and the AS determines whether the call is an encrypted call; then, MSC sends back call progress (CallProceding) message to calling mobile terminal MSA;
step 304: after the AS determines that the call is a secret voice service, the MSC processes the call according to the service logic of basic voice: according to the MSB number of the called mobile terminal, inquiring routing information from a called HLR, and acquiring a roaming number from a VLR (visitor location register) to which the called mobile terminal belongs by the HLR; after obtaining the called Mobile Station Roaming Number (MSRN), the MSC learns that the called user is the local user, and directly initiates the paging process of the called TMSIB according to the called location area;
Step 305: the network side receives the called Paging Response message and initiates the authentication and encryption process with the called mobile terminal MSB;
Step 306: the network side sends a Setup message to the called MSB;
Step 307: after receiving call confirmed (call confirmed) message of MSB of called mobile terminal, MSC sends channel distribution message to UTRAN;
Step 308: the network side waits for the ringing message of the called MSB, and after receiving the ringing message, the network side transmits the ringing message to the calling mobile terminal MSA;
step 309: the network side waits for the MSB of the called mobile terminal to be off-hooked, namely a connection message, and after receiving the connection message, the network side transmits the message to the MSA of the calling mobile terminal;
step 310: after receiving the Connect message, the calling mobile terminal MSA sends Connect ACK to the network side, and the network side sends Connect ACK to the called user;
step 311: and finishing the establishment of the voice channel between the calling mobile terminal and the called mobile terminal. Then, the two communication parties start to carry out identity authentication and key agreement in the voice channel; after the key exchange is completed, the two communication parties share the session key of the call, and the calling mobile terminal and the called mobile terminal begin to encrypt communication contents by using the session key.
An embodiment of the present invention further provides a system for recognizing a secure voice service, as shown in fig. 4, the system includes: calling mobile terminal 40, MSC 41 and application server AS 42; wherein, when the call is in progress,
The calling mobile terminal 40 is configured to send a message carrying the confidential voice service type information to the MSC;
The MSC 41 is configured to send service information including the confidential voice service type information to the AS;
and the AS 42 is used for determining that the call is an encrypted call according to the confidential voice service type information.
in the embodiment of the present invention, the message carrying the confidential voice service type information at least includes: connection Setup (Setup) signaling and connection management Request (CM Request) signaling. For example: if the calling mobile terminal carries the confidential voice service type information in the Setup signaling, filling a bear capability field information transfer capability in the Setup signaling as the confidential voice service; if the calling mobile terminal carries the confidential voice service type information in the CM Request signaling, the CM service type field is filled as the confidential voice service. Of course, the message carrying the information of the type of the secure voice service may be other messages besides the signaling.
In an embodiment of the present invention, the secure voice service type may be indicated by a default supplementary service code. For example: a value can be selected from the default supplementary service codes SS-Code: '11110000' B to '11111111' B in the 3GPP protocol as the type value of the secure voice service.
in the embodiment of the present invention, the service information sent by the MSC includes: the secret voice service type information further comprises: the numbers of the calling mobile terminal and the called mobile terminal, and the like.
the embodiment of the invention solves the problem that the existing operator network can not distinguish the open speech and the secret speech, so that the operator can provide differentiated services for the user according to the user subscription attribute, and the control power of the operator on the service is enhanced. In addition, the MSC synchronizes the service information containing the confidential voice service type information to the AS in a bypass mode, and the MSC has no influence on the voice call flow and has good applicability.
In one embodiment, the AS 42 is further configured to send the number of the mobile terminal that has opened the secure voice service to the MSC; accordingly, the method can be used for solving the problems that,
The MSC 41 is further configured to store the number of the mobile terminal that has opened the secure voice service and sent by the AS, and send service information including the type information of the secure voice service to the AS after detecting a call initiated by the mobile terminal that has opened the secure voice service. Therefore, the network flow can be saved, the consumption of network resources can be reduced, and the system performance can be improved.
Of course, in actual application, the AS may not send the number of the mobile terminal that has opened the secure voice service to the MSC, but send the corresponding service information to the AS only when the MSC receives the call from the mobile terminal (regardless of whether the call is an encrypted call or not).
In the embodiment of the invention, the physical interface between the MSC and the AS can be the existing general man-machine communication control interface of the MSC, TCP/IP is adopted, and the working protocol stack is AS follows: TCP/IP ISO/IEC 802.2, ISO/IEC 802.3.
an embodiment of the present invention further provides an MSC, as shown in fig. 5, the MSC 41 includes: a receiving module 411 and a transmitting module 412; wherein, when the call is in progress,
The receiving module 411 is configured to trigger the sending module after receiving a message carrying confidential voice service type information sent by a calling mobile terminal;
The sending module 412 is configured to send service information including the confidential voice service type information to the AS after being triggered by the receiving module;
and the service information is used for the AS to determine that the call is an encrypted call.
In one embodiment, the MSC further comprises: a storage module 413, configured to store the number of the mobile terminal that has opened the secure voice service and is sent by the AS; accordingly, the method can be used for solving the problems that,
the receiving module 411 is further configured to send the number of the mobile terminal that has opened the secure voice service, sent by the AS, to the storage module; the mobile terminal is also used for triggering the sending module after detecting the call initiated by the mobile terminal with the opened secret voice service;
the sending module 412 is further configured to send service information including the secret voice service type information to the AS.
An embodiment of the present invention further provides an AS, AS shown in fig. 6, where the AS 42 includes: a receiving module 421 and a processing module 422; wherein, when the call is in progress,
the receiving module 421 is configured to receive service information that includes the confidential voice service type information and is sent by the MSC, and send the service information to the processing module;
the processing module 422 is configured to determine, according to the confidential voice service type information, that the call is an encrypted call;
Wherein, the information of the type of the secret voice service is carried in the message sent to the MSC by the calling mobile terminal.
in one embodiment, the AS 42 further comprises: a sending module 423, configured to send the number of the mobile terminal that has opened the secure voice service to the MSC;
The number of the mobile terminal with the opened security voice service is used for the MSC to detect whether the mobile terminal initiating the call is the mobile terminal with the opened security voice service.
an embodiment of the present invention further provides a mobile terminal, where the mobile terminal is the calling mobile terminal 40 described above, and as shown in fig. 7, the mobile terminal 40 includes: a configuration module 401 and a sending module 402; wherein the content of the first and second substances,
The configuration module 401 is configured to carry the information of the type of the secure voice service in the message sent to the MSC when the call is in progress, and forward the information to the sending module;
the sending module 402 is configured to send the message carrying the confidential voice service type information forwarded by the configuration module to the MSC;
The message carrying the confidential voice service type information is used for the MSC to send the service information containing the confidential voice service type information to an Application Server (AS), so that the AS determines the call AS an encrypted call according to the confidential voice service type information.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
these computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (12)
1. A method of identifying a secure voice service, the method comprising:
when the call is in progress, the calling mobile terminal sends a message carrying the confidential voice service type information to a Mobile Switching Center (MSC);
The message carrying the confidential voice service type information is used for the MSC to send the service information containing the confidential voice service type information to an Application Server (AS), and the AS determines that the call is an encrypted call according to the confidential voice service type information.
2. The method of claim 1, wherein the message carrying the secure voice service type information at least comprises: connection Setup signaling and connection management Request, CM Request, signaling.
3. The method of claim 1, wherein the secure voice service type is indicated by a default supplementary service code.
4. a method of identifying a secure voice service, the method comprising:
when a call is in progress, after receiving a message which is sent by a calling mobile terminal and carries confidential voice service type information, a Mobile Switching Center (MSC) sends the service information containing the confidential voice service type information to an Application Server (AS);
and the service information is used for the AS to determine that the call is an encrypted call.
5. The method of claim 4, wherein after the secure voice service is opened by the mobile terminal, the method further comprises:
MSC stores the number of the mobile terminal which has opened the secret voice service and is sent by AS;
after detecting the call initiated by the mobile terminal with the opened secret voice service, the MSC sends the service information containing the secret voice service type information to the AS.
6. a method of identifying a secure voice service, the method comprising:
when a call is in progress, an application server AS receives service information which is sent by a mobile switching center MSC and contains secret voice service type information, and determines the call AS an encrypted call according to the secret voice service type information;
wherein, the information of the type of the secret voice service is carried in the message sent to the MSC by the calling mobile terminal.
7. the method of claim 6, wherein after the secure voice service is opened by the mobile terminal, the method further comprises:
the AS sends the number of the mobile terminal with the opened security voice service to the MSC for storage;
the number of the mobile terminal with the opened security voice service is used for the MSC to detect whether the mobile terminal initiating the call is the mobile terminal with the opened security voice service.
8. a mobile switching center, MSC, comprising: the device comprises a receiving module and a sending module; wherein, when the call is in progress,
the receiving module is used for triggering the sending module after receiving the message which is sent by the calling mobile terminal and carries the confidential voice service type information;
The sending module is used for sending the service information containing the confidential voice service type information to an application server AS after being triggered by the receiving module;
And the service information is used for the AS to determine that the call is an encrypted call.
9. the MSC of claim 8, wherein the MSC further comprises: a storage module; after the secure voice service is opened by the mobile terminal,
the storage module is used for storing the number of the mobile terminal which has opened the secret voice service and is sent by the AS; accordingly, the method can be used for solving the problems that,
the receiving module is further configured to send the number of the mobile terminal, which is sent by the AS and has opened the secure voice service, to the storage module; the mobile terminal is also used for triggering the sending module after detecting the call initiated by the mobile terminal with the opened secret voice service;
the sending module is further configured to send service information including the confidential voice service type information to the AS.
10. an application server, AS, comprising: the device comprises a receiving module and a processing module; wherein, when the call is in progress,
The receiving module is used for receiving the service information which is sent by the mobile switching center MSC and contains the information of the type of the secret voice service, and sending the service information to the processing module;
the processing module is used for determining the call as an encrypted call according to the confidential voice service type information;
Wherein, the information of the type of the secret voice service is carried in the message sent to the MSC by the calling mobile terminal.
11. the AS of claim 10, further comprising: a sending module; after the secure voice service is opened by the mobile terminal,
the sending module is used for sending the number of the mobile terminal with the opened security voice service to the MSC;
the number of the mobile terminal with the opened security voice service is used for the MSC to detect whether the mobile terminal initiating the call is the mobile terminal with the opened security voice service.
12. a system for identifying a secure voice service, the system comprising: a mobile terminal, a mobile switching center MSC AS claimed in claim 8 or 9 and an application server AS claimed in claim 10 or 11.
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| US6671377B1 (en) * | 1999-03-18 | 2003-12-30 | Ericsson Inc. | System and method for downloading network information to mobile stations for location calculation |
| CN101052056A (en) * | 2006-04-07 | 2007-10-10 | 华为技术有限公司 | Soft exchanging system and power identifying processing method for call business |
| CN1889782A (en) * | 2006-07-19 | 2007-01-03 | 华为技术有限公司 | Voice private calling service establishing method |
| CN101175074A (en) * | 2006-11-01 | 2008-05-07 | 华为技术有限公司 | Method and system for implementing end-to-end media stream cryptographic key negotiation |
| CN102238500A (en) * | 2010-04-21 | 2011-11-09 | 中兴通讯股份有限公司 | Method and system for forwarding calls safely |
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