WO2012174945A1 - Media content interception method and device in ip multimedia subsystem - Google Patents

Media content interception method and device in ip multimedia subsystem Download PDF

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Publication number
WO2012174945A1
WO2012174945A1 PCT/CN2012/074686 CN2012074686W WO2012174945A1 WO 2012174945 A1 WO2012174945 A1 WO 2012174945A1 CN 2012074686 W CN2012074686 W CN 2012074686W WO 2012174945 A1 WO2012174945 A1 WO 2012174945A1
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Prior art keywords
content
lic
media
device
ims
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PCT/CN2012/074686
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French (fr)
Chinese (zh)
Inventor
高扬
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中兴通讯股份有限公司
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Priority to CN201110166094.6 priority Critical
Priority to CN201110166094.6A priority patent/CN102843337B/en
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 WO2012174945A1 publication Critical patent/WO2012174945A1/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M3/00Automatic or semi-automatic exchanges
    • H04M3/22Supervisory, monitoring, management, i.e. operation, administration, maintenance or testing arrangements
    • H04M3/2281Call monitoring, e.g. for law enforcement purposes; Call tracing; Detection or prevention of malicious calls
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00Network architectures or network communication protocols for network security
    • H04L63/30Network architectures or network communication protocols for network security for supporting lawful interception, monitoring or retaining of communications or communication related information
    • H04L63/306Network architectures or network communication protocols for network security for supporting lawful interception, monitoring or retaining of communications or communication related information intercepting packet switched data communications, e.g. Web, Internet or IMS communications
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements or protocols for real-time communications
    • H04L65/10Signalling, control or architecture
    • H04L65/1013Network architectures, gateways, control or user entities
    • H04L65/1016IMS
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements or protocols for real-time communications
    • H04L65/10Signalling, control or architecture
    • H04L65/1066Session control
    • H04L65/1083In-session procedures
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M7/00Interconnection arrangements between switching centres
    • H04M7/006Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer

Abstract

Disclosed is a media content interception method in an IP multimedia subsystem. The method comprises: an access gateway control function (AGCF) controlling a media device to duplicate interception content, and reporting the interception content to a legal interception center (LIC); or, when an intercepted call starts, the IMS network device sending a media duplication instruction to an IMS access device/border device; when the intercepted call ends, the IMS network device sending a media duplication cancel instruction to the IMS access device/border device. Also disclosed is a media content interception device in an IP multimedia subsystem for implementing the method above. In the present invention, an X3 channel is directly negotiated between the AGCF and DF3, so that the X3 channel can be established more rapidly, only a few modifications need to be made to the existing system, and the present invention is compatible to various bearer layer networks.

Description

 Media content monitoring method and device in IP multimedia subsystem

 The invention relates to a monitoring technology in an IP Multimedia Subsystem (IMS) network structure, in particular to a media content monitoring method and device in an IP multimedia subsystem, and an access gateway control function entity (AGCF, Access Gateway Control) Function ). Background technique

 The Internet Protocol Multimedia Subsystem (IMS) is the future of multi-media communication and the most important component of next-generation networks. It is a subsystem supporting IP multimedia services proposed by the 3GPP (3GPP, Third Generation Partnership Project). Its distinctive feature is the use of the Session Initial Protocol (SIP) system. Communication is independent of access mode. It can have multiple multimedia service control functions and bearer separation, call and session separation, application and service separation, service and network separation, and mobile network and Internet service integration.

 It is precisely because communication technology is becoming more and more powerful, and it has penetrated into all aspects of society and life, and the use of communication technology to engage in illegal and criminal activities has become increasingly serious. Lawful interception technology has become a powerful weapon for national security agencies to fight crime. Lawful interception means that the security agency sets a specific monitoring target on the communication device for the purpose of law enforcement, and monitors the session event and communication content of the monitoring target. It is an indispensable function in the communication field. Standard organizations such as the European Telecommunications Standards Institute (ETSI) and the 3GPP have been developing standards for lawful interception. Legitimate monitoring in the field of IMS networks has also formed corresponding standards and can guide specific implementation.

FIG. 1 is a schematic diagram of a 3GPP packet-switched lawful interception architecture. As shown in FIG. 1, 3GPP proposes a lawful interception standard in the field of IMS packet switched (PS, Packet Switch) networks. Among them, the monitoring is based on the following three interfaces:

 HI1 interface, used to implement fabric control management;

 The HI2 interface is used to report the interception related information (IRI, Intercept Related Information) of the monitored target communication;

 HI3 interface, used to output the communication content of the monitored target ( CC , Communication

Content );

 The HI1 interface is separately controlled by the HI1, and the HI2 interface message is output to the control layer device, such as the Call Session Control Function (CSCF, Call Session Control Function), to output the HI3 communication content to the bearer layer network. In the figure, XI to X3 are interfaces that are connected to the IMS and the GSN, respectively, corresponding to the HI1 interface to the HI3 interface.

 The standard can be applied to include Law Enforcement Monitoring Facility (LEMF), Management Function (ADMF), Data Transfer Function 2 (DF2, Delivery Function2), Data Transfer Function 3 (DF3, Delivery Function3). And in the monitoring system of the Gigabyte System Network (GSN).

The LEMF notifies the monitoring request to the ADMF through the HI1, and the request message carries the information such as the identifier of the interception object; the ADMF sends the interception request message to the bearer layer network GSN through the X1_1, and carries the information such as the identifier of the interception object; in the IMS domain, the ADMF will listen. The request message is sent to a Proxy Call Session Control Function (P-CSCF)/Serving-Call Session Control Function (S-CSCF, Serving-Call Session Control Function); ADMF sends the interception request message to the X1_3 through Xl_3 DF3, carrying information such as the identifier of the interception object; during the start of the session to the end of the session, in the IMS domain, when the session request is routed to the P-CSCF/S-CSCF via the GSN, the P-CSCF/S-CSCF determines that the user is monitored. The P-CSCF/S-CSCF reports the IRI in the session to the DF2 through the X2; the GSN reports the CC in the session to the DF3 through the X3; DF2 root According to the monitoring request from the ADMF, the received IRI is processed by the MF and reported to the LEMF through the HI2. The DF3, according to the monitoring request from the ADMF, processes the received CC through the MF and reports it to the LEMF through the HI3.

 Nowadays, in practical applications, the next generation network with IMS as the core has a rich variety of bearer layer networks, including WLAN (Wireless Local Area Networks) and Local Area Networks (LAN). It makes it very difficult to make the lawful interception in the IMS network domain adapt to various different bearer layer networks. At the same time, many carrier layer networks are required to implement the monitoring function, which is difficult to implement in reality. Many devices may not provide monitoring function on the live network, which may cause the monitoring function to be unavailable. Summary of the invention

 In view of the above, the main object of the present invention is to provide a method and device for monitoring media content in an IP multimedia subsystem, and an AGCF, which can report the CC of the session to be monitored by the AGCF to the LIC.

 In order to achieve the above object, the technical solution of the present invention is achieved as follows:

 A media content monitoring method in an IP multimedia subsystem, comprising:

 The AGCF controls the media device to copy the listening content, and reports the monitoring content to the monitoring center LIC.

 Preferably, the reporting the interception content to the LIC is:

 The interception content is reported to the LIC through an X3 interface between the AGCF and the LIC.

 Preferably, the intercepting content is sent to the LIC by using an X3 interface between the AGCF and the LIC, where:

 The AGCF calls the LIC through the INVITE message, and negotiates with the LIC for carrying the bearer channel of the intercepted content;

The AGCF controls the media device to copy the intercepted content and send it to the LIC through the bearer channel. Preferably, the method further includes:

 After the monitoring content is reported, the AGCF releases the bearer channel by sending BYE signaling to the LIC.

 Preferably, the listening content is a communication content of a session to be listened to.

 A media content monitoring method in an IP multimedia subsystem, comprising:

 When the monitored call starts, the IMS network device sends a media copy indication to the IMS access device/boundary device;

 When the monitored call ends, the IMS network device issues a media copy cancellation indication to the IMS access device/boundary device.

 Preferably, the method further includes:

 Receiving, by the IMS access device/boundary device, the communication content of the monitored call to the LIC in real time when receiving the media copy indication;

 Upon receiving the media copy cancellation indication, the IMS access device/boundary device stops reporting the communication content of the monitored call to the LIC, and releases the resource established for transmitting the communication content of the monitored call.

 Preferably, the media copy indication and the media copy cancellation indication are carried in a session initial protocol SIP INFO message for transmission.

 Preferably, the IMS network device is a serving call session control function entity S-CSCF, or a proxy call session control function entity P-CSCF, or a listening application server AS, or a function entity CCTF for calling content;

 The IMS access device/boundary device is a border session control entity SBC, or an interconnection boundary control function entity IBCF.

 Preferably, the communication content of the monitored call includes at least one of the following information: voice, video, fax, short message, whiteboard application content, multimedia multimedia message content.

A media content monitoring device in an IP multimedia subsystem, comprising a control unit and a reporting unit, among them:

 a control unit, configured to control the media device to copy the monitoring content;

 The reporting unit is configured to report the monitored content to the LIC.

 Preferably, the reporting unit sends the interception content to the LIC through an X3 interface between the AGCF and the LIC.

 Preferably, the device further comprises a calling unit and a negotiating unit, wherein:

 a calling unit, configured to call the LIC by using an INVITE message;

 The negotiation unit is configured to negotiate with the LIC to carry the bearer channel of the interception content, and the reporting unit further reports the interception content to the LIC by using the bearer channel. A media content monitoring device in an IP multimedia subsystem, comprising:

 a sending unit, configured to send a media copy indication to the IMS access device/boundary device when the monitored call starts; and, when the monitored call ends, issue a media copy cancellation indication to the IMS access device/boundary device .

 Preferably, the device further includes a receiving unit, a reporting unit, and a releasing unit, which are disposed in the IMS access device/boundary device, where:

 a receiving unit, configured to receive a media copy indication or a media copy cancellation indication;

 a reporting unit, configured to report the communication content of the monitored call to the LIC in real time when the receiving unit receives the media copy indication;

 And a releasing unit, configured to stop, when the receiving unit receives the media copy cancellation indication, the reporting unit to report the communication content of the monitored call, and release the resource established for transmitting the communication content of the monitored call.

In the present invention, the port related information of the CC to be monitored by the AGCF and the LIC is negotiated, and the CC of the to-be-listened session is sent by the AGCF to the LIC through the DF3 through the negotiated port. The invention does not need to negotiate the interface of the X3 channel between the IMS and the LIC, but directly negotiates the X3 channel between the AGCF and the DF3, so that the X3 channel is established more quickly. And by the IMS network The DF3 directly negotiates with the DF3 to receive the port-related information of the CC of the to-be-listened session, and sends the information to the IMS access gateway/IBCF. The IMS access gateway/IBCF obtains the port-related information of the CC of the DF3. The CC of the session to be listened to, and then directly sent to the determined port. The invention can realize the monitoring of the session without major modifications to the existing IMS network, and is compatible with various bearer layer networks because the IMS access gateway/IBCF is set. The invention can realize the monitoring of the session without making major changes to the existing IMS network. DRAWINGS

 FIG. 1 is a schematic diagram of a 3GPP packet switching legal listening architecture;

 2 is a schematic diagram of a legal listening architecture of an IMS network according to the present invention;

 3 is a flowchart of a method for monitoring media content in an IP multimedia subsystem according to the present invention;

 4 is a schematic diagram of another legal listening architecture of an IMS network according to the present invention;

 5 is a flowchart of interaction between an AS/S-CSCF and an IMS access gateway/IBCF according to the present invention; FIG. 6 is a flowchart of interaction between a P-CSCF and an IMS access gateway/IBCF according to the present invention; FIG. 8 is a schematic structural diagram of a composition of a media content monitoring device in another IP multimedia subsystem according to the present invention; FIG. detailed description

The basic idea of the present invention is to add an IMS-Access GateWay/Interconnection Border Control Functions (IBCF) between the IMS network and the bearer layer network, and the AGCF uniformly faces the bearer layer network. . In this way, the related information in the session establishment process is sent to the IMS through the AGCF, and the IMS outputs the IRL. Of course, the IMS can also output the CC, but there is a phenomenon of media bypass; since the AGCF has no media negotiation capability, the present invention adopts the AGCF or After the IMS network device negotiates with the DF3, it will The port information reported by the CC informs the AGCF that the AGCF directly outputs the CC to the DF3. The AGCF may be a Session Border Control (SBC), but is not limited to this device.

 2 is a schematic diagram of a lawful interception architecture of an IMS network according to the present invention. As shown in FIG. 2, compared with the 3GPP packet switched lawful interception architecture shown in FIG. 1, the bearer layer network (GSN, WLAN, LAN, etc.) is connected to the IMS through the AGCF. The following describes in detail how each network element and its information exchange.

The LEMF notifies the monitoring request to the ADMF through the HI1, and the request message carries the information such as the identifier of the interception object; the ADMF sends the interception request message to the bearer layer network GSN/.-AVLAN/LAN through the X1_1, and carries the information such as the identifier of the interception object; The interception request message is sent to the IMS through the X1_3, and carries the information such as the identifier of the interception object; the ADMF sends the interception request message to the DF2 through the X1_4, and carries the information such as the identifier of the interception object; the ADMF sends the interception request message to the DF3 through the X1_5, and carries the interception. Information such as object identification; session establishment process, when the session request passes GSNA../WLAN/LAN, GSNA../WLAN/LAN judges that this user is monitored, listens to the monitored object according to the interception object identifier, and listens to the object related information. Sending to the AGCF; the AGCF adapts the session information sent by the bearer layer network GSN/.../WLAN/LAN to the IMS through the Adaptation Function Interface (AFI); the IMS is based on the intercept request from the ADMF. It is judged that the user is monitored, and the session information sent by the AGCF is processed, and the IRI event in the session establishment process is performed. Reported to the DF2 via an X2; Meanwhile, according to the IMS from the ADMF listen request, it is determined the user is monitored, it can be established during the session to be reported by CC X3 DF3. However, if the CC reports the CC to the DF3 through X3, there will be a media roundback problem, that is, the CC is first sent by the AGCF to the IMS, and the IMS sends the CC to the DF3. The media negotiation is end-to-end media negotiation, and does not pass through the IMS. Only the Session Description Protocol (SDP) passes through the IMS. If the IMS needs to report the CC, the media must be uploaded to the IMS. The content of the body communication is also sent to the IMS, so that the media must be negotiated between the two ends through the IMS, which causes the media to be bypassed. In response to the above problem, the AGCF is reported to the CC in order to solve the media return caused by the IMS reporting CC.

 For the above scenario problem, the technical solution of the present invention is mainly: when the AGCF determines that the to-be-listened session is enabled, and performs media negotiation IP and port with the DF3 (MGW/MGCF), after the media negotiates, the AGCF can directly directly view the CC of the session to be monitored. Reported to LIC via DF3. The DF2 reports the received IRI to the LEMF through the MF through the MF processing. The DF3 reports the received CC to the LEMF through the MF and then reports it to the LEMF.

 In the present invention, the main functions of the AG3 X3 interface are: X3 signaling channel establishment request; X3 signaling channel establishment response; X3 signaling universal deletion request; X3 signaling channel deletion response; X3 signaling channel media capability modification; The X3 bearer channel listens for content delivery.

 The X3 interface protocol between AGCF and DF3 uses the SIP protocol, and its workflow includes two parts: the call signaling process and the bearer channel data transmission. The X3 interface signaling process between AGCF and DF3 uses the SIP protocol flow, and its working protocol stack follows RFC3261. The signaling flow of the X3 interface between the AGCF and the DF3 is generated by the AGCF network element, which mainly completes the functions of establishing, deleting, and modifying the capability of the channel. The X3 bearer channel mainly realizes the transmission of the communication content of the controlled target.

 3 is a flowchart of a method for monitoring media content in an IP multimedia subsystem according to the present invention. As shown in FIG. 3, when a controlled target call is successfully established and media stream transmission is started, the AGCF initiates a message content monitoring process. Specifically, the AGCF sends an X3 channel creation request process to the LIC, and after receiving the X3 channel creation request INVITE message, the LIC returns an X3 channel creation response message 200 OK. Through this process, AGCF can obtain endpoint information and transmit a copy of the controlled target communication content. It should be noted that, in general, the AGCF needs to report the CC of the listening session to the LIC through the DF3. The media content monitoring method in the IP multimedia subsystem includes the following steps:

Step F1, the AGCF sends an INVITE message to the LIC through the DF3 to (MGW/MGCF), Request information such as dynamically assigned IP and port;

 In step F2, the LIC sends an INVITE message to the AGCF by using a 200 OK response with a 200 OK response. The INVITE message carries the dynamically assigned IP and/or port information. In step F3, the AGCF replies to the LIC with the Ack acknowledgement message, confirming that the IP address is received. And/or port information. The AGCF establishes an X3 channel with the LIC (DF3 and LIC) based on the LIC reply to the assigned IP and/or port information. After receiving the information such as IP and/or port, the AGCF receives the communication content of the session to be monitored and sends it directly to the LIC through X3. The subsequent processing method is exactly the same as the prior art, and the implementation details are not described herein again.

 In the present invention, after the monitoring content is reported, the AGCF releases the bearer channel by sending BYE signaling to the LIC.

 In the present invention, the communication content of the monitored call includes at least one of the following information: voice, video, fax, short message, whiteboard application content, multimedia multimedia message content.

 Alternatively, the media content monitoring method in the IP multimedia subsystem of the present invention may also be implemented in the following manner: FIG. 4 is a schematic diagram of another IMS network legal listening architecture according to the present invention, as shown in FIG. 4, and 3GPP packet switching shown in FIG. Compared with the lawful interception architecture, in the IMS network lawful interception architecture of the present invention, the bearer layer network (GSN, WLAN, LAN, etc.) passes through the IMS access gateway/IBCF and

The LEMF notifies the monitoring request to the ADMF through the HI1, and the request message carries the information such as the identifier of the interception object; the ADMF sends the interception request message to the bearer layer network GSN/.-AVLAN/LAN through the X1_1, and carries the information such as the identifier of the interception object; The interception request message is sent to the IMS through the X1_3, and carries the information such as the identifier of the interception object; the ADMF sends the interception request message to the DF2 through the X1_4, and carries the information such as the identifier of the interception object; the ADMF sends the interception request message to the DF3 through the X1_5, and carries the interception. Information such as object identification; During the establishment process, when the session request passes GSNA../WLAN/LAN, GSNA../WLAN/LAN judges that the user is monitored, listens to the monitored object according to the interception object identifier, and sends the interception object session related information to the IMS access gateway. / IBCF; IMS access gateway / IBCF adapts the session information sent by the bearer layer network GSN/.-AVLAN/LAN to the IMS through the Adaptation Function Interface (AFI); IMS monitors from the ADMF The request, the user is monitored, and the session information sent by the IMS access gateway/IBCF is processed, and the IRI event in the session establishment process is reported to the DF2 through the X2; at the same time, the IMS determines the user according to the interception request from the ADMF. It can be monitored, and the CC in the session establishment process can also be reported to DF3 through X3. However, if the CC reports the CC to the DF3 through X3, there will be a media roundback problem, that is, the IMS access gateway/IBCF first needs to send the CC to the IMS, and the IMS sends the CC to the DF3. The media negotiation is end-to-end media negotiation, and does not pass through the IMS. Only the Session Description Protocol (SDP) passes through the IMS. If the IMS needs to report the CC, the media must be uploaded to the IMS, that is, the IMS access gateway. / IBCF must also send the media communication content to the IMS, so that each end must pass the IMS to conduct media negotiation, which causes the media to be bypassed. In response to the above problem, in order to solve the media return caused by the IMS reporting CC, the IMS access gateway/IBCF is used to report the CC. . However, reporting the CC through the IMS access gateway/IBCF brings another problem: Since the IMS access gateway/IBCF has no media negotiation capability, the Media Gateway (MGW, Media GateWay) / Media Gateway Control Function Entity (MGCF, Media GateWay Control) Function) is the dynamic allocation of IP and port. When DF3 is the MGW/MGCF device, the IMS access gateway/IBCF is not able to negotiate with the MGW/MGCF media to obtain the dynamically assigned IP and port, and cannot be >3⁄4 CC;

For the above scenario, the technical solution of the present invention mainly uses the IMS network device and the DF3 (MGW/MGCF) to perform media negotiation IP and port. After the media negotiation, the IMS network device notifies the IMS access gateway of the media negotiated IP and port. / IBCF. In this way, the IMS access gateway/IBCF can directly report the CC to DF3. Call content triggering functional entity in IMS (CCTF, Content Of Communication Trigger Function) judges that the user is monitored according to the interception request from the ADMF, and performs media negotiation with the DF3 (MGW/MGCF) by calling the Content Of Communication Negotiate Interface (CCNI); The CCTF may be an AS/CSCF (S-CSCF or P-CSCF); the CCTF (AS/CSCF) will negotiate information (IP, port, etc.) with the DF3 (MGW/MGCF) media through the Call Content Control Interface (CCCI, Call). The Content Control Interface is sent to the IMS Access Gateway/IBCF; the IMS Access Gateway/IBCF reports CC to DF3 through the media negotiation information sent from the CCTF (AS/CSCF); DF2 will receive the IRI according to the intercept request from the ADMF. After MF processing, it is reported to LEMF through HI2. According to the monitoring request from ADMF, DF3 passes the MF processing to the received CC and then uploads it to LEMF through HI3.

 It should be understood by those skilled in the art that the foregoing CCNI and CCCI interfaces are merely exemplary, and the present invention is not limited to the above interfaces, and may be other interfaces defined by protocols. However, the message between the above interfaces is determined.

 The above CSCF may be an S-CSCF or a P-CSCF.

 The CCTF negotiates with the DF3 to control the IMS access gateway/IBCF output CC. The CCTF may be an AS/S-CSCF. The AS/S-CSCF interacts with the IMS access gateway/IBCF through a control interface, and can pass INFO/200OK. Messages interact.

 FIG. 5 is a flowchart of interaction between an AS/S-CSCF and an IMS access gateway/IBCF according to the present invention. As shown in FIG. 5, the method includes the following steps:

 1) The AS/S-CSCF sends an INVITE message to DF3 (MGW/MGCF) to request information such as dynamically assigned IP and port;

 2) DF3 (MGW/MGCF) responds with a 200 OK response. The AS/S-CSCF sends an INVITE message carrying the dynamically assigned IP and/or port information.

3) The AS/S-CSCF replies to the assigned IP and/or port by DF3 (MGW/MGCF) The information is sent to the IMS access gateway/IBCF through the INFO message;

 4) The IMS access gateway/IBCF replies with 200 OK to the AS/S-CSCF, confirming receipt of information such as IP and / or port.

 After receiving the information such as the IP address and/or the port, the IMS access gateway/IBCF receives the communication content of the session to be monitored, and then directly sends the received IP and/or port determined for the session. The subsequent processing manner is exactly the same as the prior art, and the implementation details thereof will not be described herein.

 In the present invention, the CCTF negotiates with the DF3 to control the IMS access gateway/IBCF to output the CC; wherein, the CCTF may be a P-CSCF; and the P-CSCF has an internal private interface, that is, an Application Level Gate (ALG); The P-CSCF exchanges information between the ALG and the IMS access gateway/IBCF through the control interface, and can interact through H.248 messages. FIG. 6 is a flowchart of interaction between a P-CSCF and an IMS access gateway/IBCF according to the present invention. As shown in FIG. 6, the method includes the following steps:

 1) The P-CSCF sends an INVITE message to DF3 (MGW/MGCF) requesting information such as dynamically assigned IP and port;

 2) DF3 (MGW/MGCF) responds with 200 OK response. The P-CSCF sends an INVITE message carrying the dynamically assigned IP and/or port information.

 3) The P-CSCF sends the IP and/or port information assigned by the DF3 (MGW/MGCF) to the IMS access gateway/IBCF through the H.248 message through its internal private interface ALG.

 After receiving the information such as the IP address and/or the port, the IMS access gateway/IBCF receives the communication content of the session to be monitored, and then directly sends the received IP and/or port determined for the session. The subsequent processing manner is exactly the same as the prior art, and the implementation details thereof will not be described herein.

 FIG. 7 is a schematic structural diagram of a media content monitoring apparatus in an IP multimedia subsystem according to the present invention. As shown in FIG. 7, the media content monitoring apparatus in the IP multimedia subsystem of the present invention includes a control unit 70 and a reporting unit 71, where:

The control unit 70 is configured to control the media device to copy the monitoring content. The reporting unit 71 is configured to report the monitored content to the LIC.

 The reporting unit 70 reports the interception content to the LIC through an X3 interface between the AGCF and the LIC.

 Based on the media content monitoring device in the IP multimedia subsystem shown in FIG. 7, the present invention

The media content monitoring device in the IP Multimedia Subsystem further includes a calling unit (not shown in Fig. 7) and a negotiation unit (not shown in Fig. 7), wherein:

 a calling unit, configured to call the LIC by using an INVITE message;

 The negotiation unit is configured to negotiate with the LIC to carry the bearer channel of the interception content, and the reporting unit 71 also reports the interception content to the LIC by using the bearer channel. After the reporting unit 71 reports the intercepted content, the control unit 70 releases the bearer channel by sending BYE signaling to the LIC.

 The listening content is the communication content of the session to be listened to.

 In the present invention, the communication content of the session to be monitored includes at least one of the following information: voice, video, fax, short message, whiteboard application content, multimedia multimedia message content.

 It should be understood by those skilled in the art that the media content monitoring apparatus in the IP multimedia subsystem shown in FIG. 7 is designed to implement the foregoing media content monitoring method in the IP multimedia subsystem, and the implementation functions of the foregoing processing units can be referred to. The related description of the media content monitoring method in the aforementioned IP multimedia subsystem is understood. The functions of the various processing units in the figures may be implemented by a program running on a processor or by a specific logic circuit.

 FIG. 8 is a schematic structural diagram of a media content monitoring apparatus in another IP multimedia subsystem according to the present invention. As shown in FIG. 8, the apparatus includes:

 The sending unit 80 is configured to: when the monitored call starts, issue a media copy indication to the IMS access device/boundary device; and, when the monitored call ends, issue a media copy cancellation to the IMS access device/boundary device Instructions.

On the basis of the media content monitoring device in the IP multimedia subsystem shown in FIG. 8, the present invention The media content monitoring device in the IP multimedia subsystem further includes a receiving unit 81, a reporting unit 82, and a releasing unit 83, which are disposed in the IMS access device/boundary device, where:

 The receiving unit 81 is configured to receive the media copy indication or the media copy cancellation indication; the reporting unit 82 is configured to report the communication content of the monitored call to the LIC in real time when the receiving unit receives the media copy indication;

 The releasing unit 83 is configured to stop the reporting unit from reporting the communication content of the monitored call when the receiving unit receives the media copy cancellation indication, and release the resource established for transmitting the communication content of the monitored call.

 The media copy indication and the media copy cancellation indication are carried in a SIP INFO message for transmission.

 The IMS network device is an S-CSCF, or a P-CSCF, or a listening AS, or a CCTF; the IMS access device/boundary device is a border session control entity SBC, or an interconnection boundary control function entity IBCF.

 It should be understood by those skilled in the art that the media content monitoring apparatus in the IP multimedia subsystem shown in FIG. 8 is designed to implement the foregoing media content monitoring method in the IP multimedia subsystem, and the implementation functions of the foregoing processing units can be referred to. The related description of the media content monitoring method in the aforementioned IP multimedia subsystem is understood. The functions of the various processing units in the figures may be implemented by a program running on a processor or by a specific logic circuit.

 The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

 Industrial applicability

The embodiment of the present invention negotiates the port related information of the CC of the to-be-listened session by the AGCF and the LIC, and sends the CC of the to-be-listened session to the LIC through the DF3 through the negotiated port by the AGCF, without negotiating X3 between the IMS and the LIC. The channel interface, and the X3 channel is negotiated directly between AGCF and DF3, making the X3 channel setup faster. And by the IMS network The DF3 directly negotiates with the DF3 to receive the port-related information of the CC of the to-be-listened session, and sends the information directly to the IMS access gateway/IBCF, so that the IMS access gateway/IBCF obtains the port-related information of the CC of the DF3, and then After obtaining the CC of the session to be monitored, it can be directly sent to the determined port.

Claims

Claim
 The media content monitoring method in the IP multimedia subsystem, wherein the method includes: the access gateway control function entity AGCF controls the media device to copy the monitoring content, and reports the monitoring content to the monitoring center LIC.
 2. The method of claim 1, wherein the reporting the interception content to the LIC is:
 The interception content is reported to the LIC through an X3 interface between the AGCF and the LIC.
 The method according to claim 2, wherein the intercepting content is reported to the LIC by using an X3 interface between the AGCF and the LIC, as follows:
 The AGCF calls the LIC through the INVITE message, and negotiates with the LIC for carrying the bearer channel of the intercepted content;
 The AGCF controls the media device to copy the intercepted content and send it to the LIC through the bearer channel.
 4. The method according to claim 3, wherein the method further comprises:
 After the monitoring content is reported, the AGCF releases the bearer channel by sending BYE signaling to the LIC.
 The method according to any one of claims 1 to 4, wherein the listening content is a communication content of a session to be listened to.
 A media content monitoring method in an IP multimedia subsystem, wherein the method includes: when the monitored call starts, the IMS network device sends a media copy indication to the IMS access device/boundary device;
 When the monitored call ends, the IMS network device issues a media copy cancellation indication to the IMS access device/boundary device.
The method according to claim 6, wherein the method further comprises: Receiving, by the IMS access device/boundary device, the communication content of the monitored call to the LIC in real time when receiving the media copy indication;
 Upon receiving the media copy cancellation indication, the IMS access device/boundary device stops reporting the communication content of the monitored call to the LIC, and releases the resource established for transmitting the communication content of the monitored call.
 8. The method according to claim 6, wherein the media copy indication and the media copy cancellation indication are carried in a Session Initiation Protocol SIP INFO message for transmission.
 9. The method according to claim 6, wherein the IMS network device is a serving call session control function entity S-CSCF, or is a proxy call session control function entity P-CSCF, or is a listening application server AS, or Call content triggering function entity CCTF;
 The IMS access device/boundary device is a border session control entity SBC, or an interconnection boundary control function entity IBCF.
 10. The method according to claim 6, wherein the communication content of the monitored call comprises at least one of the following information:
 Voice, video, fax, SMS, whiteboard application content, multimedia MMS content.
 11. A media content monitoring device in an IP multimedia subsystem, the device comprising a control unit and a reporting unit, wherein:
 a control unit, configured to control the media device to copy the monitoring content;
 The reporting unit is configured to report the monitored content to the LIC.
 The device according to claim 11, wherein the reporting unit reports the interception content to the LIC through an X3 interface between the AGCF and the LIC.
 13. Apparatus according to claim 12, said apparatus further comprising a call unit and a negotiation unit, wherein:
 a calling unit, configured to call the LIC by using an INVITE message;
a negotiating unit, configured to negotiate with a LIC to carry a bearer channel of the interception content; The reporting unit also reports the interception content to the LIC by using the bearer channel.
The media content monitoring device in the IP multimedia subsystem, wherein the device includes: a sending unit, configured to send a media copy indication to the IMS access device/boundary device when the monitored call starts; and When the monitored call ends, a media copy cancellation indication is issued to the IMS access device/boundary device.
 The apparatus according to claim 14, further comprising a receiving unit, a reporting unit, and a releasing unit disposed in the IMS access device/boundary device, wherein:
 a receiving unit, configured to receive a media copy indication or a media copy cancellation indication;
 a reporting unit, configured to: when the receiving unit receives the media copy indication, send the communication content of the called call to the LIC in real time;
 And a releasing unit, configured to stop, when the receiving unit receives the media copy cancellation indication, the reporting unit to report the communication content of the monitored call, and release the resource established for transmitting the communication content of the monitored call.
PCT/CN2012/074686 2011-06-20 2012-04-25 Media content interception method and device in ip multimedia subsystem WO2012174945A1 (en)

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