CN100502328C - A method, system and monitoring media gateway for multimedia monitoring - Google Patents
A method, system and monitoring media gateway for multimedia monitoring Download PDFInfo
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Abstract
The case in this invention for monitoring multimedia comprises exactly: A. the media gateway copies the monitored media flow to obtain and send the copied media flow to the monitoring media gateway; B. the latter converses the media format; and C. the monitoring media gateway transmits the conversed media to the monitor center. This invention reduces cost in technique upgrade, and saves MGW resource.
Description
Technical field
The present invention relates to the communications field, particularly relate to a kind of realization multimedia monitoring technique.
Background technology
Along with the maturation of Softswitch technology, it is moving, is all obtaining large-scale application in the fixed network.Meanwhile, increasing multimedia service is also carried out in flexible exchanging network, such as Streaming Media, visual telephone etc.Along with becoming increasingly abundant of multimedia service, to follow and produced a lot of new demands and problem, Lawful Interception is exactly one of them.Lawful Interception is meant the law enforcement (LawEnforcementAgency of country, LEA), in order to safeguard national security, hit purposes such as various forms crime, require to have the ability to obtain needed multimedia communication content, and obtain relevant informations such as its source and whereabouts by network.Along with the struggle against terror in the global range is fierce day by day, national governments are also more and more higher to the attention degree of Lawful Interception, and the access that the support of Lawful Interception is progressively become the network equipment one of requires.At present, some International Standards Organization for the Lawful Interception function, have formulated some corresponding standards, as shown in Figure 1 as 3GPP, ETSI etc.
Wherein X1 and HI1 interface are used to transmit management information, as activation, deexcitation and the modification etc. of intercept target.The transmission that X2 and HI2 interface are used to call out related news as calling subscriber identification, CSI called subscriber identification, also has some call states, exhales as rising, replys, transfer etc.X3 and HI3 interface are used for the transmission of call contents, as the voice messaging in the conversation.Between network element (soft switch, media gateway) and listening center, also have some functional units, it act as:
Medium capability: the information that receives on the X1/X2/X3 interface is fitted on the HI1/HI2/HI3 interface, and adaptive purpose is that the information format with network element is fitted to the form that listening center can be discerned.
Transmitting function: the call-related information and the call contents information that are used for receiving from network element send to one or more listening centers.For the X3 interface, can be divided into signaling again and transmit and carry transmitting function.
Lawful Interception management function: be responsible at listening center and monitor and to realize corresponding management between the network, as the setting of intercept target, deletion etc.
As shown in Figure 2, be the schematic diagram of speech business Lawful Interception, LIG among the figure (Lawful interception gateway Lawful Interception Gateway) finishes adaptive (medium capability, the transmitting function) of X1 and HI1, X2 and HI2 interface.Media gateway (MGW, Media Gateway) MGW2 sends to listening center with the call contents (voice) of monitoring users under the control of soft switch, X3 is transparent to transmitting function between the HI3 interface and medium capability, and promptly network element (soft switch and media gateway) directly transmits call contents and need not middle conversion to listening center.
But when this method is applied to the Lawful Interception of multimedia service, as video monitor, the Media Stream media formats of then monitoring Media Stream media formats in the network and listening center may be inconsistent, and promptly the Media Stream monitored of network element place possibly can't directly store on the listening center.Need X3 to change to transmitting function and medium capability between the HI3 interface this moment.
Present scheme is built-in medium conversion facilities on each media gateway in the intercept target district, finishes under the control of soft switch and monitors the conversion of network media stream media format to listening center Media Stream media formats.Finish the media gateway of media conversion this moment, promptly is the media gateway that monitoring users inserts.As shown in Figure 3, be the schematic diagram of this scheme, monitoring users insert by MGW2 and MGW1 under another user carry out Multimedia session, MGW1 is by soft switch 1 control, MGW2 is by soft switch 2 controls.This moment, MGW1 and MGW2 disposed medium conversion facilities, but because monitoring users inserts at MGW2, so 2 control MGW2 finish the conversion of monitoring Media Stream by soft switch, the media stream transition of the media formats 1 when being about to the monitoring users session becomes the Media Stream of the media formats 2 of listening center identification.
Such scheme since in the intercept target district built-in medium conversion facilities on each media gateway, if therefore network needs upgrading, then need each soft switch and media gateway in the network are all carried out transformation and upgrade, consider its functional development cost, the improvement cost of each node, this scheme implementation cost that gets up is very high, and the time is longer, add the present situation that actual Operation Network is made up of the equipment of how tame equipment vendor, it is difficult especially to implement this scheme, and when not having the multimedia call of monitoring users under the media gateway, will make the monitor function of this media gateway idle, the waste media resource; In addition, the media formats of the Media Stream after the different media gateway conversions may be different, and just need listening center to support multiple media formats kind this moment.
Summary of the invention
Embodiments of the invention provide a kind of and realize method, the system that multimedia is monitored and monitor media gateway, finish the conversion of media stream formats, realize the monitoring of multimedia service, solve existing multimedia monitoring technique transformation and upgrade cost height, length consuming time, the problem of waste MGW media resource.
A kind of method that realizes that multimedia is monitored of the embodiment of the invention may further comprise the steps:
A, media gateway duplicate the Media Stream of monitoring to obtain duplicate media stream, and described duplicate media stream is sent to the monitoring media gateway;
B, monitoring media gateway are carried out the media format conversion of described duplicate media stream, to obtain the discernible convert media stream of listening center;
C, monitoring media gateway send to listening center with described convert media stream and monitor to carry out multimedia.
A kind of monitoring media gateway of the embodiment of the invention (Interception Media Gateway IMG), comprising:
At least one virtual gateway unit: be used for linking to each other, receive the instruction of the soft switch that links to each other with this virtual gateway unit with soft switch;
Media Stream receiving element: be used for the Media Stream that the receiving media gateway sends;
Processing unit: finish the conversion of described Media Stream media formats according to described instruction, form the discernible convert media stream of listening center;
Media Stream transmitting element: be used for sending described convert media stream to listening center.
A kind of multimedia monitoring system of the embodiment of the invention comprises soft switch, media gateway, listening center, further comprises: monitor media gateway; Soft switch is used to obtain the media formats of monitoring Media Stream, indicating media gateway duplicates the monitoring Media Stream, generate duplicate media stream, and be used for indication and monitor media gateway and set up medium with listening center and be connected, obtain the media formats of the Media Stream of monitoring media gateway and listening center session; Described media gateway is used for duplicate media stream is sent to the monitoring media gateway; Described monitoring media gateway: be used to receive described duplicate media stream, described duplicate media stream is become to monitor the media formats of the Media Stream that media gateway is connected with the listening center medium from the media format conversion of monitoring Media Stream, generate the discernible convert media stream of listening center, convert media stream is sent to listening center.
The beneficial effect of the embodiment of the invention is as follows:
The method of the embodiment of the invention, Apparatus and system are finished the transformation of media stream formats by monitoring media gateway, realize the monitoring of multimedia service, reduced multimedia monitoring technique transformation and upgrade cost, shortened the transformation cycle, be convenient to administer and maintain monitoring service, rationally utilize media resource.
Description of drawings
Fig. 1 is existing Lawful Interception functional configuration schematic diagram;
Fig. 2 is that schematic diagram is monitored in existing speech business;
Fig. 3 is that existing multimedia service is monitored schematic diagram;
Fig. 4 is the multimedia monitoring system of the embodiment of the invention and monitors media gateway architectures figure;
Fig. 5 is the method flow diagram of the embodiment of the invention;
Fig. 6 is that the multimedia service of the embodiment of the invention is monitored schematic diagram;
Fig. 7 is the media stream path schematic diagram of the embodiment of the invention;
The signaling process figure of Fig. 8 for the monitoring users of the embodiment of the invention and when Multimedia session side inserts in same MGW and monitoring users makes a call as caller.
Embodiment
As shown in Figure 4, the embodiment of the invention provides a kind of multimedia monitoring system, specifically comprises: soft switch 401, monitoring media gateway 402, listening center 403, media gateway 404, Lawful interception gateway 405, user terminal 406 and monitoring users 407.Wherein monitoring media gateway 402 specifically comprises: processing unit 4021, Media Stream receiving element 4022, Media Stream transmitting element 4023, at least one virtual gateway unit 4024 (three virtual gateway unit have been shown among Fig. 4).When using single monitoring media gateway to support a network that comprises a plurality of soft switch, need be in a single physical gateway virtual a plurality of virtual gateways unit, connect each soft switch in the net by these virtual gateways.Between each soft switch and virtual gateway unit, to control by signaling H.248, these virtual gateway unit use the media resource of monitoring media gateway 402 by processing unit 4021, finish the conversion of multimedia form.The strategy of media resource reservation and distribution can be a static allocation, also can be dynamic.Described in addition monitoring media gateway 402 can also comprise: decrypting device 4025 and/or protected location 4026.
If the Media Stream that media gateway 404 sends be encrypt the time, can carry out corresponding decryption oprerations by the duplicate media stream that 4025 pairs of Media Stream receiving elements 4022 of decrypting device of monitoring in the media gateway 402 are received, send to processing unit 4021 again and carry out the conversion of media stream formats.All like this Media Streams are all converged to the monitoring media gateway and are decrypted processing.If desired the Media Stream after the conversion is protected, then can between monitoring media gateway 402 and listening center 403, be set up a VPN (Virtual Private Network virtual private networks) passage convert media stream is protected by protected location 4026.Present multimedia monitoring system need be set up the VPN passage between each media gateway and listening center, and the media gateway that has may owing to equipment self or network be former thereby can not support these methods, and the embodiment of the invention only is used in to monitor and sets up a VPN passage between media gateway and the listening center and realize that the VPN passage can have multiple implementation as setting up by the IPsec agreement.
Monitor media gateway 402 and can be independently physical entity, also can with the media gateway unification of other type, thereby can reduce cost.
The embodiment of the invention provides a kind of and finishes the conversion of Media Stream with the monitoring media gateway, realizes the method that multimedia service is monitored, as shown in Figure 5, and when soft switch finds that the monitoring users of registration thereon and other user terminal are set up session:
The media gateway of step S1, soft switch indication monitoring access point will be monitored Media Stream (Media Stream that monitoring users sends, monitoring users receives both direction) and duplicate, and generate duplicate media stream;
Step S2, soft switch indicate above-mentioned media gateway that duplicate media stream is sent to the monitoring media gateway;
The medium connection (generally by the SIP signaling) that media gateway is established to listening center is monitored in step S3, soft switch indication;
The media formats 1 (promptly monitoring the media formats of Media Stream and duplicate media stream) of the Media Stream of monitoring users session is obtained in step S4, soft switch;
The media formats 2 of monitoring the Media Stream that media gateway is connected with the listening center medium is obtained in step S5, soft switch;
Step S6, soft switch are according to above-mentioned media formats 1 and media formats 2, and indication is monitored media gateway and converted duplicate media stream to media formats 2 from media formats 1, generate convert media stream;
Step S7, monitoring media gateway send to listening center with convert media stream.
Certainly, it all is identical that the media formats of in most of the cases monitoring the Media Stream that the medium of media gateway and listening center connect may be monitored at every turn, so monitor for the first time medium that media gateway is established to listening center connect obtain the media formats of monitoring the Media Stream that media gateway is connected with the medium of listening center after, soft switch or the media formats of monitoring media gateway can be connected the monitoring media gateway of obtaining for the first time with the medium of listening center Media Stream are predisposed to the media formats of monitoring the Media Stream that media gateway is connected with the medium of listening center, later on media formats 2 direct these preset values of employing that step S5 obtains during monitoring at every turn.
The media gateway of above-mentioned monitoring access point refer to soft switch the monitoring users session the media gateway that is used to monitor selected in the media gateway of process.
If monitor Media Stream that media gateway receives and be encrypt the time, after step S2, monitor media gateway Media Stream be decrypted.
Fig. 6 is that the multimedia service of the embodiment of the invention is monitored schematic diagram, and as shown in Figure 6, monitoring users carries out Multimedia session by another user under media gateway MGW 2 accesses and the media gateway MGW 1, and MGW1 is by soft switch 1 control, and MGW2 is by soft switch 2 controls.Soft switch 2 indication this moment MGW2 finish and monitor the duplicating of Media Stream (monitoring users receives and monitoring users sends the Media Stream of both direction), and will duplicate back Media Stream (media formats of its Media Stream is a media formats 1) and be transferred to monitoring media gateway IMW.Then, soft switch 2 is set up medium by SIP signaling indication monitoring media gateway with listening center and is connected, and the monitoring media gateway is a media formats 2 with the media formats of the Media Stream of the medium connection of listening center.At last, soft switch 2 indication IMW finish duplicate media stream conversion of 2 from media formats 1 to media formats, and the media flow transmission after final IMW will change arrives listening center.
As shown in Figure 7, be the media stream path schematic diagram of the embodiment of the invention, monitoring users and Multimedia session square tube are crossed media gateway MGW and are carried out Multimedia session, and T1 is the destination node that monitoring users inserts among the MGW, and T3 represents the replica node of T1 among the MGW; T2 represents the destination node that Multimedia session side inserts among the MGW, and T4 represents the replica node of T2 among the MGW; The Media Stream of T1 and T2 exchanges, and monitoring users and Multimedia session side just can carry out Multimedia session like this.The Media Stream that T3 sends monitoring users duplicates and delivers to the destination node T5 that monitors in the media gateway then; The Media Stream that T4 sends Multimedia session side duplicates and delivers to the destination node T6 that monitors in the media gateway then; T7 is responsible for the Media Stream that T5 inserts is changed, and is sent to listening center then; T8 is responsible for the Media Stream that T6 inserts is changed, and is sent to listening center then.
Specific embodiment: as shown in Figure 8, be that monitoring users and Multimedia session side insert in same MGW and the embodiment of monitoring users when making a call as caller.Media stream path wherein is identical with the associated description of Fig. 7 with the destination node definition.Concrete steps are as follows:
Step 801, monitoring users (calling subscriber) are initiated Invite conversation request message (session 1) to soft switch, carried called subscriber's address in the message, by the receiver address (IP address and port) of its Media Stream of SDP protocol apprizes soft switch and the media formats of request;
Step 802, soft switch are sent Add message to media gateway MGW, increase the Media Stream that destination node T1 is used for inserting monitoring users (calling subscriber) at media gateway MGW;
Step 803, soft switch are sent Add message to media gateway MGW, increase destination node T3 at media gateway MGW and are used for duplicating the Media Stream that T1 inserts;
Step 804, soft switch are sent Add message to monitoring media gateway, increase destination node T5 and are used for inserting Media Stream from T3 monitoring media gateway;
Step 805, soft switch are sent Add message to monitoring media gateway, increase destination node T7 and are used for changing Media Stream from T5 monitoring media gateway;
Step 806, soft switch are initiated Invite conversation request message (session 2) to listening center, in message, carry the monitoring users sign, inform listening center, the Media Stream that listening center will receive is the Media Stream that monitoring users sends, and passes through the media formats of its request of SDP protocol apprizes listening center;
Step 807, listening center return 180 ALERTING messages (session 2) to soft switch, by the media formats of its selection of SDP protocol apprizes soft switch, and in order to the address (IP address and port) of receiving media stream;
Step 808, soft switch are sent Add message to media gateway, increase the Media Stream that destination node T2 is used for inserting media session side (called subscriber) in media gateway;
Step 809, soft switch are sent Add message to media gateway, increase destination node T4 in media gateway and are used for duplicating the Media Stream that T2 inserts;
Step 810, soft switch are sent Add message to monitoring media gateway, increase destination node T6 and are used for inserting Media Stream from T4 monitoring media gateway;
Step 811, soft switch are sent Add message to monitoring media gateway, increase destination node T8 and are used for changing Media Stream from T6 monitoring media gateway;
Step 812, soft switch are initiated Invite conversation request message (session 3) to listening center, in message, carry the monitoring users sign, inform listening center, the Media Stream that listening center will receive is the Media Stream (Media Stream that media session side sends) that monitoring users receives, and passes through the media formats of its request of SDP protocol apprizes listening center;
Step 813, listening center return 180 ALERTING messages (session 3) to soft switch, by the media formats of its selection of SDP protocol apprizes soft switch, and in order to the address (IP address and port) of receiving media stream;
Step 814, soft switch are sent Invite conversation request message (session 1) according to the address of called subscriber in the step 801 to media session side (called subscriber), inform the address (IP address and port) of the media formats and the receiving media stream of its support of media session side (called subscriber);
Step 815, media session side (called subscriber) return 180 ALERTING messages (session 1) to soft switch, and the media formats by its selection of SDP protocol apprizes soft switch, and in order to the address (IP address and port) of receiving media stream;
Step 816, soft switch are sent Modify message according to the media formats that media session side in the step 815 (called subscriber) returns to media gateway, revise the media formats of T1;
Step 817, soft switch are sent Modify message according to the media formats that media session side in the step 815 (called subscriber) returns to media gateway, revise the media formats of T3;
The media formats that step 818, soft switch are returned according to media session side in the step 815 (called subscriber) sends Modify message to monitoring media gateway, revises the media formats of T5;
Media formats and media address that step 819, soft switch are returned according to listening center in the step 807 are sent Modify message to monitoring media gateway, revise media formats and the distant end media address of T7;
Step 820, soft switch are sent Modify message according to the media formats that media session side in the step 815 (called subscriber) returns to media gateway, revise the media formats of T2;
Step 821, soft switch are sent Modify message according to the media formats that media session side in the step 815 (called subscriber) returns to media gateway, revise the media formats of T4;
The media formats that step 822, soft switch are returned according to media session side in the step 815 (called subscriber) sends Modify message to monitoring media gateway, revises the media formats of T6;
Media formats and media address that step 823, soft switch are returned according to listening center in the step 813 are sent Modify message to monitoring media gateway, revise media formats and the distant end media address of T8;
Step 824, soft switch send 200OK response message (session 2) to listening center, and the expression monitoring users sends the monitoring session of Media Stream and sets up successfully;
Step 825, soft switch send 200OK response message (session 3) to listening center, and the monitoring session of expression monitoring users receiving media stream is set up successfully;
Step 826, soft switch send 180 ALERTING messages (session 1) to monitoring users, and the media formats of selecting by SDP protocol apprizes monitoring users Multimedia session side, and in order to the address (IP address and port) of receiving media stream;
Step 827, the user answer of media session side send 200OK response message (session 1) to soft switch;
Step 828, soft switch send 200OK response message (session 1) to monitoring users, and Multimedia session is set up.
So far monitoring users (calling subscriber) and media session side (called subscriber's) Multimedia session is set up successfully, and the media path set up by session 2 of the Media Stream that sends of monitoring users (T1-〉T3-〉T5-〉T7) send to listening center; The media path that the Media Stream that monitoring users receives is set up by session 3 (T2-〉T4-〉T6-〉T8) send to listening center.
Embodiment of the invention principle can be applied on the multiple example, is sent to listening center as the video that H.324M video in the mobile soft switch WCDMA network is converted in the IP network, has so just simplified the kind of interface and the investment of the required support of listening center.
The device, the system and method that provide by the embodiment of the invention, finish the transformation of media stream formats by monitoring media gateway, realized monitoring to the multimedia service under the flexible exchanging network, reduced the cost when implementing the multimedia monitoring, be convenient to administer and maintain monitoring service, rationally utilize media resource, be easy to realize the security requirement of Media Stream, simplified the media formats and the kind of interface of the required support of listening center.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (14)
1, a kind of method that realizes that multimedia is monitored is characterized in that, said method comprising the steps of:
A, media gateway duplicate the Media Stream of monitoring to obtain duplicate media stream, and described duplicate media stream is sent to the monitoring media gateway;
B, monitoring media gateway are carried out the media format conversion of described duplicate media stream, to obtain the discernible convert media stream of listening center;
C, monitoring media gateway send to listening center with described convert media stream and monitor to carry out multimedia.
2, the method for claim 1 is characterized in that, described step B specifically comprises:
B1, obtain the media formats of described monitoring Media Stream;
B2, obtain the media formats of the Media Stream of listening center;
B3, described monitoring media gateway become described duplicate media stream the media formats of listening center Media Stream from the media format conversion of described monitoring Media Stream.
3, method as claimed in claim 2 is characterized in that, described step B2 specifically comprises:
The medium that B21, monitoring media gateway are established to listening center connect;
The media formats of monitoring the Media Stream that media gateway is connected with the listening center medium is obtained in B22, soft switch.
4, method as claimed in claim 2 is characterized in that, the media formats of the Media Stream of the listening center described in the described step B2 is the media formats that presets.
5, the method for claim 1 is characterized in that, described monitoring Media Stream is encrypted, and further comprises after the described steps A:
A1, monitoring media gateway are decrypted described duplicate media stream.
6, the method for claim 1 is characterized in that, described convert media stream is sent to listening center by the VPN passage of monitoring between media gateway and the listening center.
7, the method for claim 1 is characterized in that, described monitoring media gateway is arranged in the media gateway or a physical entity independently.
8, a kind of monitoring media gateway is characterized in that, comprising:
At least one virtual gateway unit: be used for linking to each other, receive the instruction of the soft switch that links to each other with this virtual gateway unit with soft switch;
Media Stream receiving element: be used for the Media Stream that the receiving media gateway sends;
Processing unit: finish the conversion of described Media Stream media formats according to described instruction, form the discernible convert media stream of listening center;
Media Stream transmitting element: be used for sending described convert media stream to listening center.
9, monitoring media gateway as claimed in claim 8 is characterized in that, described monitoring media gateway further comprises:
Decrypting device: be sent to described processing unit after being used for described Media Stream is decrypted.
10, monitoring media gateway as claimed in claim 8 is characterized in that, described monitoring media gateway further comprises:
Protected location: be used for described convert media stream being protected by the VPN passage of monitoring between media gateway and the listening center.
11, monitoring media gateway as claimed in claim 8 is characterized in that, described monitoring media gateway is arranged in the media gateway or is a physical entity independently.
12, a kind of multimedia monitoring system comprises soft switch, media gateway, listening center, it is characterized in that, further comprises: monitor media gateway; Soft switch is used to obtain the media formats of monitoring Media Stream, indicating media gateway duplicates the monitoring Media Stream, generate duplicate media stream, and be used for indication and monitor media gateway and set up medium with listening center and be connected, obtain the media formats of the Media Stream of monitoring media gateway and listening center session; Described media gateway is used for duplicate media stream is sent to the monitoring media gateway;
Described monitoring media gateway: be used to receive described duplicate media stream, described duplicate media stream is become to monitor the media formats of the Media Stream that media gateway is connected with the listening center medium from the media format conversion of monitoring Media Stream, generate the discernible convert media stream of listening center, convert media stream is sent to listening center.
13, system as claimed in claim 12 is characterized in that, described monitoring Media Stream is encrypted, and described monitoring media gateway is decrypted described duplicate media stream.
14, system as claimed in claim 12 is characterized in that, described monitoring media gateway sends to listening center with described convert media stream by the VPN passage.
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| CN101406029B (en) * | 2006-12-30 | 2011-04-20 | 华为技术有限公司 | System and method for monitoring video-telephone service in multimedia network |
| CN101534264A (en) * | 2008-03-14 | 2009-09-16 | 华为技术有限公司 | Method and equipment for realizing intercommunication of IMS domain and CS domain |
| EP2830275A1 (en) * | 2013-07-23 | 2015-01-28 | Thomson Licensing | Method of identification of multimedia flows and corresponding apparatus |
| CN108650425B (en) * | 2018-05-15 | 2021-03-19 | 中国联合网络通信集团有限公司 | Monitoring method and monitoring system |
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