CN101406029A - System for monitoring video-telephone service in multimedia network - Google Patents

Abstract

The invention discloses a system for voice monitoring of video phone VP service in wideband code division multiple access WCDMA network. The system receives the monitoring request and monitoring related information from the monitoring center LEA, processes the communication flow of the monitoring target to obtain audio data, converts the audio data into a format supported by the monitoring center, and sends it to the listening center.

Description

A System for Voice Monitoring of Video Telephony Service in Multimedia Network

technical field

The invention relates to monitoring technology in multimedia communication, in particular to a general system for voice monitoring of video telephone service in multimedia communication network.

Background technique

In order to protect public safety and national security, the state can and must legally authorize the interception and monitoring of the interception target's communications. However, the rapid growth of telecommunication services makes it more and more difficult to monitor calls using traditional methods. Therefore, modern telecommunication networks require new interception strategies. Generally speaking, interception methods in the circuit-switched domain (CS) mainly aim at intercepting voice. The voice stream is duplicated at the media gateway (MGW) and sent to the listening request source via the trunk E1. An interception request source is an entity authorized to intercept communications and receive interception results. For example, the listening center LEA is a source of listening requests. However, the monitoring interfaces of different monitoring request sources are different from country to country. For example: most monitoring centers support time division multiplexing (TDM) interfaces, while some monitoring centers support Internet Protocol (IP) interfaces.

In multimedia networks, such as wideband code division multiple access (WCDMA) networks, video telephony (VP) services have been introduced. This service has a 64Kbit/s unrestricted digital information (UDI) bearing capacity, video, audio and control information. transmitted by a channel. However, interception specifications for video telephony services generally do not exist in WCDMA networks. Moreover, the traditional monitoring center only conducts voice monitoring.

Therefore, it is necessary to provide traditional monitoring request sources such as monitoring centers with the ability to perform voice monitoring of video telephony services in multimedia networks.

Contents of the invention

The present invention includes a system including concepts and methods for voice monitoring of video telephony (VP) services in a multimedia network. When the listening center LEA receives a request for monitoring a certain target and related monitoring information, as a response, if the monitoring target is in a video phone call, the system processes the communication flow of the monitoring target to obtain audio data therefrom; The audio data is converted into a format supported by the monitoring center, and then sent to the monitoring center.

The invention realizes the voice monitoring of the video telephone service without changing the traditional monitoring center.

The following specification and drawings describe in detail some illustrative embodiments of the invention. These examples illustrate only a few of the many ways in which the invention can be practiced.

Description of drawings

For a more comprehensive understanding of the present invention and its advantages, reference may be made to the following description in conjunction with the accompanying drawings, in which the same symbols represent the same parts:

Fig. 1 is the traditional method schematic diagram that carries out video telephony (VP) monitoring in circuit switching (CS) domain;

FIG. 2 is a schematic diagram of videophone monitoring in the circuit switched domain according to an embodiment of the present invention;

Fig. 3 is the schematic diagram that carries out the videophone monitoring through Internet protocol of the embodiment of the present invention;

Fig. 4 is a schematic diagram of monitoring a video call in a circuit switched domain according to another embodiment of the present invention.

Detailed ways

The following discussion is intended to enable any person skilled in the art to understand and apply the present invention. The general principle described here can be applied not only to the embodiments described in detail below, but also to all embodiments and applications included in the spirit and protection scope of the present invention. The protection scope of the present invention is not limited to the embodiments, but the broadest protection scope including all the principles and features of the present invention.

Referring to FIG. 1, a diagram 100 depicts a conventional method for video telephony (VP) interception in the circuit switched (CS) domain. Legal Intercept Gateway (LIG) 120 provides intercept request sources such as Interception Center LEA 130 with the ability to intercept conversations in a Wideband Code Division Multiple Access (WCDMA) network. The interception center 130 sends an interception request and interception-related information to a mobile softswitch (MSOFTSWITCH) 110 through the lawful interception gateway 120 . The lawful interception gateway 120 converts the format of the control signaling between the mobile softswitch 110 and the interception center 130 . Interception center 130 and lawful interception gateway 120 communicate through handover interfaces (HI) HI1 and HI2. The lawful interception gateway 120 can be connected with multiple interception centers.

In addition, Lawful Interception Gateway 120 communicates with Mobile Softswitch 110 via Transmission Control Protocol/Internet Protocol (TCP/IP) on interfaces X1 and X2. The mobile softswitch 110 includes a Back Management Module (BAM) 111 and an X Protocol Transport Unit (XPTU) 112 . The mobile softswitch 110 instructs the media gateway (MGW) 140 to connect the call of the user.

After the call is established between the user 151 and the user 152, two ports 140a and 140b are allocated in the media gateway (MGW) 140 to connect the users 151 and 152, and these two ports are used to receive and send the user's media stream. When the listening center 130 sends a request to monitor the user 151 to the mobile softswitch 110 through the lawful interception gateway 120, the mobile softswitch 110 allocates ports 140c and 140d in the media gateway (MGW) 140, and these two ports can duplicate the user 151 Uplink media stream (the media stream sent by user 151) and downlink media stream (the media stream received by user 151, that is, the media stream sent by user 152), and the uplink media stream and downlink media stream are sent to Listening center 130 . In this way, monitoring of user 151 in the WCDMA network is realized. If user 151 is in a video telephony call, the upstream and downstream media streams are H.233 multiplexed streams including audio and video media streams.

Traditional videotelephony monitoring practices using the methods described above or similar strategies have several drawbacks. Since the capacity information needs to be transmitted through the control protocol H.245 in the initial stage of video telephony, this requires the monitoring center to correctly analyze the H.245 protocol, which increases the complexity. Also because the audio, video and control information in the video phone is carried in an H.223 message packet and transmitted to the monitoring center, this requires the monitoring center to support the H.223 protocol instead of only supporting simple audio or video media flow. Moreover, since the media gateway only copies the media stream but does not analyze it, it requires the monitoring center to analyze multiple media formats, which requires very high interoperability.

Therefore, in order to monitor video calls, the monitoring center must meet the above requirements. However, the traditional monitoring center only supports voice monitoring, and does not support video monitoring of video telephony services. Moreover, traditional monitoring centers do not support protocols such as H.245 and H.223. Therefore, in the face of these requirements and limitations, it is impossible for the traditional monitoring center to implement voice monitoring of video telephony services.

The invention realizes the voice monitoring of the video telephone service in the multimedia communication network without changing the traditional monitoring center. The multimedia communication network may be a WCDMA network. In the present invention, after receiving the monitoring request from the monitoring center, the mobile softswitch will detect whether the user to be monitored is a video phone user. If the user is a video phone user, the network can provide a switching module under the control of the mobile softswitch. The conversion module can process the media stream of the user's video phone service, and obtain the audio media stream from the call service. The conversion module can be built into the media gateway. The audio media stream is then sent to the monitoring center for monitoring.

The conversion module can be implemented in many ways and in different forms. Audio media streams can be sent to the monitoring center through different interfaces, and the monitoring center can provide necessary interface information to the mobile softswitch. Listening can also be started according to a predefined configuration in the network. In this case, the mobile softswitch can directly provide the switching module according to the predefined configuration. The present invention can be applied to, but not limited to, an monitoring center for voice monitoring of video telephony services. The present invention can be applied to other interception request sources that have similar functions to the traditional interception center or are obvious to those of ordinary skill in the art.

Referring to FIG. 2 , a diagram 200 describes a method and system for monitoring a video call in a circuit-switched domain according to an embodiment of the present invention. The mobile softswitch 210 obtains its request for intercepting the user 251 and information related to the interception from the interception center 230 through the legal interception gateway 220 . The monitoring-related information may include, for example, identification information of the user 251, monitoring type, codec information, and the like.

The user identification information includes the International Mobile Subscriber Identity (IMSI), the International Mobile Terminal Equipment Identity (IMEI), and the Mobile Station International ISDN Number (MSISDN) of the user 251 . ISDN is Integrated Services Digital Network. The monitoring type refers to the media type that the monitoring request source requests to monitor. Media can be audio, video, data or a combination thereof. In this embodiment, the monitoring type is voice. The mobile softswitch 210 includes a reverse management module 211 and an X protocol transmission unit 212 .

Two ports 240a and 240b are allocated in the media gateway 240 to connect a call between a user 251 and another user 252 . After receiving the monitoring request, the mobile softswitch 210 determines whether the user 251 is in a video phone call. If the user 251 is making a video call, the mobile softswitch 210 notifies the coal body gateway 240 to provide a conversion module 241 to process the user 251 receiving and sending media streams.

The mobile softswitch 210 can also initiate monitoring of a certain user according to a fixed or predefined configuration, and can be configured to monitor users corresponding to a certain video phone number, a certain range of video phone numbers, or all video phone numbers. Listening related information can also be predefined in this configuration. These configurations are predefined and stored in the system based on listening requests of authorized listening entities. Once the monitoring target (the user to be monitored) starts a video phone call, the target information contained in the predefined configuration information will be used to initiate monitoring. This is good for long-term monitoring. In this way, listeners can be started based on configuration information rather than receiving listener requests directly. In other words, the mobile softswitch 210 can perform interception without directly receiving the interception request and related information from the interception center or other interception request sources. In this case, the mobile softswitch 210 may directly require the media gateway 240 to provide a conversion module 241 for processing video telephony services according to a given configuration.

The conversion module 241 separates the H.245 message from the upstream media stream and the downstream media stream of the user 251, uploads the H.245 message to the mobile softswitch 210, and decomposes the media stream under the control of the mobile softswitch 210, so that the audio and Video media streams are separated from H.223 message packets. The media gateway 240 converts the audio media stream into a format supported by the listening center 230 . Audio media streams are transmitted to ports 240c and 240d for transmission. Under the control of the mobile softswitch 210, the media gateway 240 establishes a voice channel between the monitoring center 230 and the media gateway 240, and sends the audio media stream of the user 251 to the monitoring center 230 through the audio interface E1, thereby realizing the monitoring center 230 Voice monitoring of video call users. In another embodiment, media gateway 240 may communicate with multiple listening centers.

Referring to FIG. 3 , a diagram 300 describes a method and system for monitoring a video call through Internet Protocol (IP) according to an embodiment of the present invention. The interception center 330 transmits interception-related information to the mobile softswitch 310 through the lawful interception gateway 320 . The interception-related information includes the interception user 351's International Mobile Subscriber Identity, International Mobile Equipment Identity, and ISDN number of the mobile station, as well as interception type, codec information, and the HI3 interface address of the interception center 330, etc. The monitoring type can be voice, video, data or a combination of multiple media. HI3 is a handover interface for delivering call content to the monitoring center. The HI3 interface address may include a real-time transport protocol (RTP) address and a real-time transport control protocol (RTCP) address. In this example, listening center 330 supports an IP interface. In addition, the mobile softswitch 310 includes a reverse management module 311 and an X protocol transmission unit 312 .

Two ports 340a and 340b are allocated in the media gateway 340 to enable media streaming communication between a user 351 and another user 352 . When it is determined that the user 351 is making a video call, the mobile softswitch 310 prompts the media gateway 340 to provide a conversion module 341 in the media gateway 340 to process the media stream received and sent by the user 351 . The conversion module 341 separates the H.245 message from the uplink media stream and downlink media stream of the user 351 , uploads the H.245 message to the mobile softswitch 310 , and decomposes the media stream under the control of the mobile softswitch 310 . So far, audio and video media streams have been separated from H.223 message packets.

Then, the media gateway 340 converts the audio media stream into a format supported by the listening center 330 . Next, the mobile softswitch 310 assigns two ports 340c and 340d to the uplink media stream and downlink media stream of the user 351 in the media gateway 340 . These two IP port addresses are bound together with the HI3 interface address. The conversion module 341 in the media gateway 340 sends the audio media stream to the corresponding port 340c or 340d, and the port 340c or 340d sends the audio media stream to the listening center 330 in turn through the HI3 interface.

Therefore, by introducing a conversion module in the media gateway to obtain the audio media stream from the video telephony stream of the monitoring target, the present invention provides voice monitoring in the video telephony service without changing the traditional monitoring center.

Referring to FIG. 4 , a diagram 400 describes another embodiment of the present invention, a method and a system for monitoring a video call in the circuit switching domain. Its basic process is the same as the two aforementioned embodiments of the present invention. The mobile softswitch 410 may receive an interception request and interception related information for the user 451 from the interception center 430 through the legal interception gateway 420 .

After the call is established between the user 451 and the user 452, ports 440a and 440b are allocated in the media gateway 440 to receive and send the media stream of the call service between the two users.

The conversion module 441 is provided under the control of the mobile softswitch 410 if the user 451 is conducting a video telephony call. The conversion module 441 is associated with the media gateway 440 but is not built into the media gateway 440 . As shown in FIG. 4, the conversion module 441 can be an independent module, or a module in other units in the multimedia network. The conversion module 441 can communicate with the media gateway 440 through the interface E1 or the interface IP.

After the media stream is duplicated at the ports 440c and 440d, it is sent to the conversion module 441 for processing. The conversion module 441 extracts the audio data from the received media stream under the control of the mobile softswitch 410, and sends it to the monitoring center 440 through the interface E1.

In this embodiment, a conversion module is provided outside of a given media gateway. The independent conversion module can be further shared by multiple media gateways. This not only reduces the complexity of the media gateway, but also simplifies the network structure, thereby reducing the cost of the network.

In order to enable those skilled in the art to understand or apply the present invention, the above provides detailed descriptions of the disclosed embodiments of the present invention. Those skilled in the art can easily make various changes to these embodiments, and the general principles described here are applicable to other embodiments included in the spirit and protection scope of the present invention. Therefore, the protection scope of the present invention is not limited to the embodiments, but the broadest protection scope including all the principles and new features of the present invention.

Claims (44)

1, a kind of system that visual telephone VP business is carried out audio monitoring in multimedia communication network is characterized in that this system comprises:

At least one interception request source;

Processing unit is used to handle the communication stream of at least one intercept target therefrom to obtain voice data; With

Medium attachment unit is used for carrying out voice data communication with at least one interception request source.

2, system according to claim 1 is characterized in that, described medium attachment unit converts speech data to form that described at least one interception request source is supported, and sends it to described at least one interception request source.

3, system according to claim 1 is characterized in that, carries out described audio monitoring based on predefined configuration.

4, system according to claim 1 is characterized in that, this system further comprises:

Control unit is used to control audio monitoring.

5, system according to claim 4 is characterized in that, described control unit is used for receiving request and the Intercept related information that at least one intercept target is monitored from described at least one interception request source.

6, system according to claim 5, it is characterized in that described Intercept related information comprises IMSI International Mobile Subscriber Identity IMSI, International Mobile Station Equipment Identification IMEI, the international integrated services digital network number of travelling carriage MSISDN, interception type and coding/decoding information.

7, system according to claim 6 is characterized in that, described Intercept related information further comprises the transfer interface IP address in described at least one interception request source.

8, system according to claim 4 is characterized in that, described control unit is used to judge whether described at least one intercept target is carrying out video telephony call.

9, system according to claim 4 is characterized in that, described control unit is used to audio monitoring that predefined configuration is provided.

10, system according to claim 4 is characterized in that, described control unit is mobile soft switch.

11, system according to claim 1 is characterized in that, described at least one interception request source is listening center LEA.

12, system according to claim 11 is characterized in that, speech data is sent to described listening center by interface E1.

13, system according to claim 11 is characterized in that, described listening center is supported Internet Protocol IP.

14, system according to claim 13 is characterized in that, this voice data is sent to this listening center by the IP interface.

15, system according to claim 11 is characterized in that, described medium attachment unit is a media gateway.

16, system according to claim 11 is characterized in that, described processing unit is a modular converter.

17, system according to claim 16 is characterized in that, described modular converter is built in the media gateway.

18, system according to claim 16, it is characterized in that, described modular converter H.245 message is separated from communication stream, will be H.245 message upload to mobile soft switch, and under this moves the control of soft switch, decompose this communication stream and then from H.223 obtaining the Voice ﹠ Video data the message bag.

19, system according to claim 1 is characterized in that, described multimedia communication network is a Wideband Code Division Multiple Access (WCDMA) WCDMA network.

20, a kind of media gateway of visual telephone business being carried out audio monitoring in multimedia communication network is characterized in that, this media gateway comprises:

From the communication stream of visual telephone, obtain the unit of voice data, video data and control information; With

The unit that carries out voice data communication with the interception request source.

21, media gateway according to claim 20 is characterized in that, described voice data transmits by interface E1.

22, media gateway according to claim 20 is characterized in that, described voice data transmits by Internet protocol IP interface.

23, media gateway according to claim 20 is characterized in that, described interception request source is listening center LEA.

24, a kind of system that visual telephone business is carried out audio monitoring in Wideband Code Division Multiple Access (WCDMA) WCDMA network is characterized in that this system comprises:

Listening center;

Mobile soft switch is used for receiving interception request and the Intercept related information that intercept target is monitored from described listening center;

Modular converter is used to handle eavesdropping target's communication stream therefrom to obtain voice data; With

Media gateway is used for voice data is converted to form that listening center can support and sends it to listening center by interface E1;

Described Intercept related information comprises IMSI International Mobile Subscriber Identity IMSI, International Mobile Station Equipment Identification IMEI, the international integrated services digital network number of travelling carriage MSISDN, interception type and coding/decoding information;

If intercept target is being carried out video telephony call, described media gateway provides described modular converter;

Described modular converter H.245 message is separated from communication stream, and it is uploaded to mobile soft switch, and decomposes this communication stream and then from H.223 obtaining the Voice ﹠ Video data the message bag under this moves the control of soft switch.

25, a kind of method of visual telephone VP business being carried out audio monitoring in multimedia communication network is characterized in that this method comprises:

The communication stream of handling at least one intercept target is therefrom to obtain voice data; With

Carry out voice data communication with at least one interception request source.

26, method according to claim 25 is characterized in that, described voice data communication further comprises: convert voice data to form that described at least one interception request source is supported, and send it to described at least one interception request source.

27, method according to claim 25 is characterized in that, carries out described audio monitoring based on predefined configuration.

28, method according to claim 27 is characterized in that, mobile soft switch is used to provide this predefined configuration.

29, method according to claim 25 is characterized in that, this method further comprises judges whether described at least one intercept target is carrying out video telephony call.

30, method according to claim 25 is characterized in that, this method further comprises:

Receive interception request and the Intercept related information that described at least one intercept target is monitored from described at least one interception request source.

31, method according to claim 30 is characterized in that, what be used to receive described interception request and Intercept related information is mobile soft switch.

32, method according to claim 30, it is characterized in that described Intercept related information comprises IMSI International Mobile Subscriber Identity IMSI, International Mobile Station Equipment Identification IMEI, the international integrated services digital network number of travelling carriage MSISDN, interception type and coding/decoding information.

33, method according to claim 32 is characterized in that, described Intercept related information further comprises the transfer interface IP address in described at least one interception request source.

34, method according to claim 25 is characterized in that, described at least one interception request source is listening center LEA.

35, method according to claim 34 is characterized in that, described speech data is sent to this listening center by interface E1.

36, method according to claim 34 is characterized in that, described listening center is supported Internet Protocol IP.

37, method according to claim 36 is characterized in that, described speech data is sent to this listening center by the IP interface.

38, method according to claim 34 is characterized in that, media gateway MGW is used for carrying out voice data communication with described listening center.

According to the described method of claim 38, it is characterized in that 39, this media gateway converts voice data to form that described listening center is supported, and sends it to described listening center.

40, method according to claim 34 is characterized in that, processing unit is used to handle the communication stream of described at least one intercept target therefrom to obtain voice data.

According to the described method of claim 40, it is characterized in that 41, described processing unit is a modular converter.

According to the described method of claim 41, it is characterized in that 42, described modular converter is built in the described media gateway.

43, according to the described method of claim 41, it is characterized in that, described modular converter H.245 message is separated from communication stream, and it is uploaded to mobile soft switch, and decomposes this communication stream and then from H.223 obtaining the Voice ﹠ Video data the message bag under this moves the control of soft switch.

44, method according to claim 25 is characterized in that, described multimedia communication network is a Wideband Code Division Multiple Access (WCDMA) WCDMA network.

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