CN101406029B - System and method for monitoring video-telephone service in multimedia network - Google Patents
System and method for monitoring video-telephone service in multimedia network Download PDFInfo
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- CN101406029B CN101406029B CN2006800006105A CN200680000610A CN101406029B CN 101406029 B CN101406029 B CN 101406029B CN 2006800006105 A CN2006800006105 A CN 2006800006105A CN 200680000610 A CN200680000610 A CN 200680000610A CN 101406029 B CN101406029 B CN 101406029B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/22—Arrangements for supervision, monitoring or testing
- H04M3/2281—Call monitoring, e.g. for law enforcement purposes; Call tracing; Detection or prevention of malicious calls
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/30—Network architectures or network communication protocols for network security for supporting lawful interception, monitoring or retaining of communications or communication related information
- H04L63/306—Network 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M7/00—Arrangements for interconnection between switching centres
- H04M7/006—Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer
- H04M7/0078—Security; Fraud detection; Fraud prevention
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Abstract
The invention discloses a system for carrying out voice interception for Video Phone (VP) services in a multimedia communication network. The system receives an interception request to perform interception on a target and interception related information from a Law Enforcement Agency (LEA), processes communication traffic of the intercept target to obtain audio data from the communication traffic, converts the audio data into a format that is supported by the LEA, and delivers the audio data to the LEA. The invention also discloses a method for carrying out voice interception for VP services in a multimedia communication network.
Description
Technical field
The present invention relates to the monitoring technique in the multimedia communication, be meant a kind of general-purpose system of in multimedia communication network, visual telephone business being carried out audio monitoring especially.
Background technology
Be protection public safety and national security, country can and be necessary legal authorization is carried out in the monitoring of the communication of intercept target and monitoring.Yet the growth at full speed of telecommunication service makes that to utilize conventional method to carry out conversation monitoring more and more difficult.Therefore, modern telecom network needs new monitoring strategy.As a rule, the monitor method of circuit commutative field (CS) is a target to monitor voice mainly.Voice flow is replicated in media gateway (MGW), and sends to the interception request source via relaying E1.The interception request source is an entity through authorizing intercept communications and receiving snoop results.For example, listening center LEA is exactly a kind of interception request source.Yet the monitoring interface in inter-State different interception request source is discrepant.As: most of listening center is supported time division multiplexing (TDM) interface, and some listening centers are supported Internet protocol (IP) interface.
At multi-media network, in Wideband Code Division Multiple Access (WCDMA) (WCDMA) network, introduced visual telephone (VP) business, this business has the bearing capacity of 64Kbit/s unristricted digital information (UDI), and video, audio frequency and control information are all by a Channel Transmission.Yet, in the WCDMA network, do not exist for the monitoring standard that visual telephone business is formulated usually.And traditional listening center only carries out audio monitoring.
Therefore, just need be for being provided at the ability of in the multi-media network visual telephone business being carried out audio monitoring such as traditional interception request sources such as listening centers.
Summary of the invention
The embodiment of the invention comprises a system, and this system is included in the various conceptions and the method for in the multi-media network visual telephone (VP) business being carried out audio monitoring.When listening center LEA received request that certain target is monitored and Intercept related information, in response, if this intercept target is being carried out video telephony call, this system handled the communication stream of intercept target, therefrom to obtain voice data; Convert this voice data to form that this listening center can be supported, send it to this listening center then.
A kind of system that in multimedia communication network, visual telephone VP business is carried out audio monitoring, 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,
This system further comprises: control unit, be used to control audio monitoring, and described control unit is mobile soft switch,
Wherein, described at least one interception request source is listening center LEA, described processing unit is a modular converter, 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.
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.
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 at least one intercept target of processing unit processes is therefrom to obtain voice data; With
Carry out voice data communication with at least one interception request source,
Described method further comprises: mobile soft switch is used to control audio monitoring,
Wherein, described at least one interception request source is listening center LEA, described processing unit is a modular converter, described modular converter H.245 message is separated from communication stream, it is uploaded to mobile soft switch, and move at this and to decompose this communication stream under control of soft switch and then from H.223 obtaining the Voice ﹠ Video data the message bag.
The embodiment of the invention has realized under the prerequisite that traditional listening center is made a change visual telephone business is carried out audio monitoring not needing.
The following description book and accompanying drawing have specifically described illustrative embodiment more of the present invention.These embodiment have only illustrated and have realized in the multiple mode that the present invention can adopt a few.
Description of drawings
Embodiment for a more complete understanding of the present invention and advantage thereof can be with reference to below in conjunction with the description of the drawings, and the same tag in the accompanying drawing is represented identical part:
Fig. 1 carries out the conventional method schematic diagram that visual telephone (VP) is monitored in circuit switching (CS) territory;
Fig. 2 be the embodiment of the invention carry out the schematic diagram of carry out vp interception at circuit commutative field;
Fig. 3 is the schematic diagram that Internet protocol carries out carry out vp interception that passes through of the embodiment of the invention;
Fig. 4 be another embodiment of the present invention carry out the schematic diagram of carry out vp interception at circuit commutative field.
Embodiment
Below discussing is intended to allow those skilled in the art understand and apply the invention.The embodiment that General Principle described here not only can be applied to the following specifically describes also can be applicable to be included among all embodiment and application within spirit of the present invention and the protection range.Protection scope of the present invention is not limited only to described embodiment, but comprises that all meet the wideest protection range of principle of the present invention and feature.
Referring to Fig. 1, Figure 100 has described and carried out the conventional method that visual telephone (VP) is monitored in circuit switching (CS) territory.Lawful interception gateway (LIG) 120 is such as interception request sources such as listening center LEA 130, is provided at the ability of monitoring conversation in Wideband Code Division Multiple Access (WCDMA) (WCDMA) network.Listening center 130 sends interception request and Intercept related information by Lawful interception gateway 120 to mobile soft switch (MSOFTSWITCH) 110.Lawful interception gateway 120 is changed the form of control signaling between mobile soft switch 110 and listening center 130.Communicate by delivering interface (HI) HI1 and HI2 between listening center 130 and the Lawful interception gateway 120.Lawful interception gateway 120 can be connected with a plurality of listening centers.
In addition, Lawful interception gateway 120 communicates by TCP (TCP/IP) and mobile soft switch 110 on interface X1 and X2.Mobile soft switch 110 comprises Backend Administration Module (BAM) 111 and X agreement delivery unit (XPTU) 112.Mobile soft switch 110 indicating media gateways (MGW) 140 connect user's conversation.
After setting up conversation between user 151 and the user 152, in media gateway (MGW) 140, distribute two-port 140a to be connected user 151 and 152 with 140b, this two-port is used for receiving and sending user's Media Stream.When listening center 130 by Lawful interception gateway 120 when mobile soft switch 110 sends the request that user 151 is monitored, mobile soft switch 110 distributes port 140c and 140d in media gateway (MGW) 140, this two-port can be duplicated user 151 up Media Stream (Media Stream that user 151 sends) and the downlink media stream (Media Stream that user 151 receives, be the Media Stream that user 152 sends), and should up Media Stream and downlink media stream send to listening center 130 by interface E1 independently.Like this, just realized in the WCDMA network monitoring to user 151.If user 151 is carrying out video telephony call, this uplink and downlink Media Stream is the H.233 multiplex stream that comprises audio and video medium stream.
Use the conventional practices for vp interception of said method or similar strategy to have some defectives.Owing to need H.245 transmit capacity information by control protocol in the starting stage of visual telephone, this just requires listening center can correctly resolve H.245 agreement, thereby complexity is increased.Also H.223 be transferred to listening center in the message bag because audio frequency, video and control information in the visual telephone are carried at one, this just requires this listening center to support H.223 agreement, rather than only supports simple audio or video Media Stream.And because a media gateway duplicate media stream but it is not resolved, this just requires listening center to resolve multiple media formats, and this just requires very high interoperability.
Therefore, in order to carry out carry out vp interception, listening center must satisfy above-mentioned requirements.Yet a conventional leas support voice is monitored, and does not support the video monitor of visual telephone business.And conventional leas is not supported as H.245 and H.223 waiting agreement.Therefore, in the face of these requirements and restriction, conventional leas can not realize visual telephone business is carried out audio monitoring.
The embodiment of the invention has realized in multimedia communication network visual telephone business being carried out audio monitoring not needing to change under the situation of conventional leas.This multimedia communication network can be the WCDMA network.In embodiments of the present invention, after the interception request that receives listening center, mobile soft switch meeting detects whether the user that will be monitored is video telephony user.If this user is a video telephony user, under the control of mobile soft switch, network can provide modular converter.This modular converter can be handled the Media Stream of this user video telephone service, and obtains audio medium stream from this talk business.This modular converter can be built among the media gateway.This audio medium stream is sent to this listening center for monitoring then.
This modular converter can be realized with multiple mode and different forms.Audio medium stream can send to listening center by distinct interface, and listening center can provide necessary interface message to mobile soft switch.Monitor and also can start according to predefined configuration in network.In this case, mobile soft switch can directly provide this modular converter according to predefined configuration.The embodiment of the invention can be applied to but be not limited to visual telephone business is carried out the listening center of audio monitoring.The embodiment of the invention can be applied to have and other interception request sources conventional leas similar functions or conspicuous for those of ordinary skills.
Referring to Fig. 2, Figure 200 has described the embodiment of the invention is carried out carry out vp interception in circuit commutative field method and system.Mobile soft switch 210 obtains request and the Intercept related information that it is monitored user 251 by Lawful interception gateway 220 from listening center 230.This Intercept related information can comprise, as user 251 identity identification information, interception type and coding/decoding information etc.
User identification information may comprises user 251 IMSI International Mobile Subscriber Identity (IMSI), International Mobile station Equipment Identity IMEI (IMEI) and Mobile Subscriber International ISDN number (MSISDN) etc.ISDN is an integrated services digital network.Interception type refers to the medium type of interception request source request monitoring.Medium can be audio frequency, video, data or its combination.In the present embodiment, interception type is voice.Mobile soft switch 210 comprises backward supervision module 211 and X agreement delivery unit 212.
In media gateway 240, distribute two-port 240a to be connected user 251 and another user's 252 conversation with 240b.After receiving interception request, mobile soft switch 210 judges whether user 251 is carrying out video telephony call.If user 251 is carrying out video telephony call, mobile soft switch 210 notice media gateway 240 provide modular converter 241, handle so that user 251 is received and send Media Stream.
Mobile soft switch 210 also can come certain user is initiated to monitor according to fixing or predefined configuration, and the user that can dispose certain visual telephone number, certain visual telephone number range or all videos telephone number correspondence monitors.Also can this configuration in the predefine Intercept related information.These configurations are based on the interception request predefine of authorizing the monitoring entity and are stored in the system.In case intercept target (user that need be monitored) beginning video telephony call will use the target information that comprises in the predetermined configuration information to initiate to monitor.This helps carrying out long-term monitoring.Like this, the interception request based on configuration information rather than directly reception just can start oracle listener.In other words, mobile soft switch 210 does not directly receive interception request and relevant information and just can monitor from listening center or other interception request sources.In this case, mobile soft switch 210 can directly require media gateway 240 to be provided for handling the modular converter 241 of visual telephone business according to given configuration.
Referring to Fig. 3, Figure 30 0 has described the embodiment of the invention is carried out carry out vp interception by Internet protocol (IP) method and system.Listening center 330 transmits Intercept related information by Lawful interception gateway 320 to mobile soft switch 310.This Intercept related information comprises the HI3 interface IP address of the international integrated services digital network number of IMSI International Mobile Subscriber Identity, International Mobile Station Equipment Identification and the travelling carriage of monitoring users 351 and interception type, coding/decoding information and listening center 330 etc.This interception type can be the combination of voice, video, data or multiple medium.HI3 is the interface of delivering of carrying dialog context for listening center.The HI3 interface IP address can comprise real-time transport protocol (rtp) address and RTCP Real-time Transport Control Protocol (RTCP) address.In this example, listening center 330 is supported the IP interface.In addition, mobile soft switch 310 comprises backward supervision module 311 and X agreement delivery unit 312.
Distribution two- port 340a and 340b realize the Media Stream communication between user 351 and another user 352 in media gateway 340.Carrying out video telephony call when judging user 351, mobile soft switch 310 prompting media gateway 340 provide modular converter 341 in media gateway 340, handle so that user 351 is received and send Media Stream.Modular converter 341 is isolated H.245 message from up Media Stream of the user 351 and downlink media stream, H.245 message uploads to mobile soft switch 310, and decomposes Media Stream under the control of mobile soft switch 310.So far, H.223 audio and video medium stream by from separating the message bag.
Then, media gateway 340 converts audio medium stream to form that listening center 330 is supported.Then, mobile soft switch 310 is user 351 up Media Stream and corresponding two port 340c and the 340d of distributing of downlink media stream in media gateway 340.These two IP port addresss and HI3 interface IP address bind together.Modular converter 341 in the media gateway 340 sends to corresponding ports 340c or 340d with this audio medium stream, and port 340c or 340d send to listening center 330 by the HI3 interface with this audio medium stream more successively.
Therefore, by introducing modular converter obtaining audio medium stream from the visual telephone stream of intercept target in media gateway, the embodiment of the invention provides the audio monitoring in the visual telephone business under not needing to change the prerequisite of traditional listening center.
Referring to Fig. 4, Figure 40 0 has described another embodiment of the present invention is carried out carry out vp interception at circuit commutative field method and system.Its basic procedure is identical with aforementioned two embodiment of the present invention.Mobile soft switch 410 can be by Lawful interception gateway 420 from interception request and the Intercept related information of listening center 430 receptions to user 451.
After setting up conversation between user 451 and the user 452, in media gateway 440, distribute port 440a and 440b to receive and send the Media Stream of talk business between two users.
If user 451 is carrying out video telephony call, under the control of mobile soft switch 410, provide modular converter 441.Modular converter 441 is associated with media gateway 440, but is not built in the media gateway 440.As shown in Figure 4, modular converter 441 can be a standalone module, also can be the module in other unit in the multi-media network.Modular converter 441 can be communicated by letter with media gateway 440 by interface E1 or interface IP.
Media Stream sends to modular converter 441 and handles after port 440c and 440d are replicated.Modular converter 441 extracts voice data from the Media Stream that receives under the control of mobile soft switch 410, and send it to listening center 440 by interface E1.
In the present embodiment, outside given media gateway, provide modular converter.This independently modular converter can further be shared by a plurality of media gateway.So not only reduce the complexity of media gateway, also simplified network configuration, thereby reduced the cost of network.
In order to make those skilled in the art can understand or use the present invention, more than provided the detailed description of disclosed embodiment of the present invention.Those skilled in the art are easy to these embodiment are made multiple change, and General Principle described here is applicable among other embodiment that are included within spirit of the present invention and the protection range.Therefore, protection scope of the present invention is not limited only to described embodiment, but comprises that all meet the wideest protection range of principle of the present invention and new feature.
Claims (31)
1. 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,
This system further comprises: control unit, be used to control audio monitoring, and described control unit is mobile soft switch,
Wherein, described at least one interception request source is listening center LEA, described processing unit is a modular converter, 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.
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, described control unit is further 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.
5. system according to claim 4, 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.
6. system according to claim 5 is characterized in that, described Intercept related information further comprises the transfer interface IP address in described at least one interception request source.
7. system according to claim 1 is characterized in that, described control unit is further used for judging whether described at least one intercept target is carrying out video telephony call.
8. system according to claim 1 is characterized in that, described control unit is further used for providing predefined configuration for audio monitoring.
9. system according to claim 1 is characterized in that speech data is sent to described listening center by interface E1.
10. system according to claim 1 is characterized in that, described listening center is supported Internet Protocol IP.
11. system according to claim 10 is characterized in that, this voice data is sent to this listening center by the IP interface.
12. system according to claim 1 is characterized in that, described medium attachment unit is a media gateway.
13. system according to claim 1 is characterized in that, described modular converter is built in the media gateway.
14. system according to claim 1 is characterized in that, described multimedia communication network is a Wideband Code Division Multiple Access (WCDMA) WCDMA network.
15. a 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.
16. a 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 at least one intercept target of processing unit processes is therefrom to obtain voice data; With
Carry out voice data communication with at least one interception request source,
Described method further comprises: mobile soft switch is used to control audio monitoring,
Wherein, described at least one interception request source is listening center LEA, described processing unit is a modular converter, described modular converter H.245 message is separated from communication stream, it is uploaded to mobile soft switch, and move at this and to decompose this communication stream under control of soft switch and then from H.223 obtaining the Voice ﹠ Video data the message bag.
17. method according to claim 16 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.
18. method according to claim 16 is characterized in that, carries out described audio monitoring based on predefined configuration.
19. method according to claim 18 is characterized in that, mobile soft switch is used to provide this predefined configuration.
20. method according to claim 16 is characterized in that, this method further comprises judges whether described at least one intercept target is carrying out video telephony call.
21. method according to claim 16 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.
22. method according to claim 21 is characterized in that, what be used to receive described interception request and Intercept related information is mobile soft switch.
23. method according to claim 21, 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.
24. method according to claim 23 is characterized in that, described Intercept related information further comprises the transfer interface IP address in described at least one interception request source.
25. method according to claim 16 is characterized in that, described speech data is sent to this listening center by interface E1.
26. method according to claim 16 is characterized in that, described listening center is supported Internet Protocol IP.
27. method according to claim 26 is characterized in that, described speech data is sent to this listening center by the IP interface.
28. method according to claim 16 is characterized in that, media gateway MGW is used for carrying out voice data communication with described listening center.
29. method according to claim 28 is characterized in that, this media gateway converts voice data to form that described listening center is supported, and sends it to described listening center.
30. method according to claim 16 is characterized in that, described modular converter is built in the described media gateway.
31. method according to claim 16 is characterized in that, described multimedia communication network is a Wideband Code Division Multiple Access (WCDMA) WCDMA network.
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| PCT/CN2006/003713 WO2008086639A1 (en) | 2006-12-30 | 2006-12-30 | System for voice interception of video phone services in a multi-media network |
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| CN102158859A (en) * | 2009-12-15 | 2011-08-17 | 华为技术有限公司 | Control method for monitoring user, monitoring system and network node |
| CN105471664A (en) * | 2014-08-19 | 2016-04-06 | 中兴通讯股份有限公司 | Automatic packet capturing method and automatic packet capturing device |
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| EP1307036B1 (en) * | 2001-10-29 | 2006-03-01 | Telefonaktiebolaget LM Ericsson (publ) | Call monitoring in a communication system |
| ATE281734T1 (en) * | 2002-08-08 | 2004-11-15 | Cit Alcatel | LEGAL INTERCEPTION FOR VOIP CALLS IN AN IP COMMUNICATION NETWORK |
| CN100334843C (en) * | 2002-12-16 | 2007-08-29 | 华为技术有限公司 | System and method for realizing packet voice network monitoring |
| US7336944B2 (en) * | 2003-06-27 | 2008-02-26 | Lucent Technologies Inc. | Method and apparatus for legal intercept monitoring of a cellular telephone modem (CTM) device |
| US7092493B2 (en) * | 2003-10-01 | 2006-08-15 | Santera Systems, Inc. | Methods and systems for providing lawful intercept of a media stream in a media gateway |
| EP1528774A1 (en) * | 2003-10-30 | 2005-05-04 | Alcatel | Method and system of providing lawful interception of calls |
| CN100397831C (en) * | 2004-01-16 | 2008-06-25 | 华为技术有限公司 | System and method for realizing IP multimedia business monitoring |
| DE102004040480B4 (en) * | 2004-08-20 | 2006-05-24 | Siemens Ag | Method and device for user data acquisition of multimedia connections in a packet network |
| CN100384160C (en) * | 2005-07-14 | 2008-04-23 | 华为技术有限公司 | Method and apparatus for monitoring video-calling |
| CN100433664C (en) * | 2006-02-05 | 2008-11-12 | 华为技术有限公司 | Network monitoring system and method for realizing monitoring |
| CN100502328C (en) * | 2006-12-22 | 2009-06-17 | 华为技术有限公司 | A method, system and monitoring media gateway for multimedia monitoring |
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