CN1913533A - Remote video monitoring system based on session initialize protocol and its implementing method - Google Patents
Remote video monitoring system based on session initialize protocol and its implementing method Download PDFInfo
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Abstract
This invention relates to a remote video monitor system and a method based on the SIP protocol, in which, said SIP applied system is composed of a communication network, a front monitor device, a monitor center and a remote monitor customer end and an operation support platform and the communication network includes: IP network, PSTN network, ISDN and a mobile communication network,which takes the open SIP protocol as the core signaling protocol to realize the functions of system registration, setting up monitor session, transmitting monitor information and removing the monitor session and expand information body in the SIP short message to realize system session parameter negotiations, SIP short message transmission, adjustment of monitor parameters, managing and controlling front end monitor device, collecting charge information and expanding device kinds or increasing new control functions to meet the needs of open expansion applied needs and realize large scale applications by the current networks.
Description
Technical field
The present invention relates to Active Eyes and its implementation of a kind of dialogue-based initializtion protocol, belong to computer network and communication technical field.
Background technology
Simulation, half word and digital three phases have been experienced in the development of video monitoring system, have been widely used in many fields such as communication both domestic and external, finance, traffic, mining industry at present, and have brought into play huge effect.Along with development of technologies, the whole world can reach, open intercommunication, the unified extensive operation class video monitoring service of standard is becoming new growth requirement.But, owing to lack industry standard, the market access requires low, equipment component manufacturer blindly produces panoramic video monitoring equipment for pursuing commercial interest, the reliability, stability, opening, extended capability and the performance such as safe and secret that cause being at present some Active Eyes of application stage are all poor, cause very big inconvenience and loss to the user, also can't realize the requirement that to manage, can run, under the serious situation even bring influence may for the people's lives and property safety.Therefore, fail safe, opening, the scaling concern that how to solve video monitoring system become the technology focus that those skilled in the art are badly in need of solving.
As everyone knows, Session initiation protocol SIP (Session Initiation Protocol) be by the Internet engineering duty group IETF proposed in 1999 in based on the Ip network, particularly in the network environment of Intemet structure, realize a kind of signaling protocol that real time communication is used, though develop the initial purpose of this agreement is with helping provide the senior telephone service of crossing over the internet, be used for setting up, session between one or more participants of modification and termination IP based network, the session here (Session) comprises internet (or any other IP network) call, multimedia conferencing and multimedia issue, the member in the session can communicate by the network of multicast or clean culture contact.SIP has many characteristics, for example supports conversation description, allows the participant to reach an agreement on one group of compatible media types, supports user mobility by agency and redirect request to user's current location simultaneously.SIP does not bundle with any specific meeting control protocol.Therefore, plurality of advantages such as Session Initiation Protocol is simple by means of it, be easy to expand, be convenient to realize more and more obtain the favor of industry, and progressively become in next generation network NGN and the 3G multimedia subsystem domain one of the most active important protocol, and the client software and the intelligent multimedia terminal that occur the increasing SIP of support on the market, and server and the Softswitch realized with Session Initiation Protocol.The application of relevant SIP in video communication become the focus that those skilled in the art pay close attention to, now, had many pieces of patent documentations to publish.For example:
Patent documentation CN1469585 " session and media authorization method in the dialogue-based startup protocol of I P video-telephone system " discloses session and media authorization method in a kind of IP video-telephone system that adopts session initiation protocol, it is to adopt network management technology based on strategy to realize mandate to session, produce administration order by a strategic server, the announcement session Control Server is carried out management activities; With the licensing issue that solves session and medium in the IP video-telephone system.Set up in the process in session, each network element exchanges authorization message by transmitting authorization token; This invention is adapted at realizing in IP video-telephone system and other system to media authorization.
Patent documentation CN1421083 " internet protocol telephony voice audio/video message deposit and retrieval " discloses a kind of roundup transfer system IMS on the IP Internet protocol network and has sent signal and be used to deposit the method for message and a kind of roundup transfer system IMS on the IP Internet protocol network and send signal and be used to retrieve the method that is stored message.
Above-mentioned two patent documentations, though all related to visual telephone or video messaging, especially the former has adopted Session Initiation Protocol, but, they all do not relate to the SIP application system and the implementation method of relevant video monitoring, therefore, along with popularizing and growth requirement of video monitoring system, how to utilize the technical characterstic of Session Initiation Protocol, develop as early as possible and a kind ofly can overcome and solve the new video monitoring system that prior art exists fail safe, opening, the many defectives of autgmentability, become the technological break-through point that scientific and technical personnel in the industry are badly in need of solving.
Summary of the invention
In view of this, Active Eyes and its implementation of the purpose of this invention is to provide a kind of dialogue-based initializtion protocol, this system uses Session Initiation Protocol, transmitting SIP message between various monitor terminals and network element device, and the SIP short message expanded, to realize the various monitoring functions in the video monitoring system; And, by using Session Initiation Protocol, make this video monitoring system have opening, autgmentability, be convenient to provide extensive operation class video monitoring service.
In order to achieve the above object, the invention provides a kind of Active Eyes of dialogue-based initializtion protocol, it is characterized in that: the application system of the Session initiation protocol SIP that described system is made up of communication network, front end watch-dog, Surveillance center and remote monitoring client, five members of operation supporting platform, wherein communication network comprises: IP internet, public switch telephone network PSTN, integrated services digital network ISDN, mobile radio communication; This system is the core signaling protocol with open Session Initiation Protocol, realize system registry, set up monitor session, transmitting, monitoring message, remove the function of monitor session, and can expand the message body in the SIP short message, realize system session parameter negotiation, SIP short message transmission, monitoring parameter adjustment, management and control front end watch-dog, gather charge information and extension facility type or increase new controlled function, to satisfy open expanded application demand and to utilize existing network to realize large-scale application.
Described system and equipment wherein further have following function:
Each equipment possesses IPv6 and/or IPv4 protocol stack, uses IPv6 or IPv4 protocol transmission SIP signaling, makes this system can self adaptation IPv6 and/or the multiprotocol network environment of IPv4;
Session Initiation Protocol signaling flow and service media flow point are from transmission: front end watch-dog, remote monitoring client respectively with Surveillance center's transmitting SIP control signaling each other, follow-up service media stream then adopts point-to-point mode to transmit, to reduce the load of Surveillance center, the large scale deployment of enhanced system autgmentability and back-up system;
Adopt the Session Initiation Protocol of expansion to realize the negotiation of cryptographic algorithm and the exchange of key, interactive information to communicating pair is carried out encryption, encryption to service media stream can stop that the hacker monitors the media data packet of transmission over networks, the system authentication function can avoid the hacker to intercept and capture SIP signaling address or the sip server/SIP client that disguises oneself as brings in and steals user profile, ensures user profile and communication security;
With the control signaling of SIP signaling, provide the service of passing through of NAT for front end watch-dog and/or remote monitoring client as passing through NAT; Control signaling with the Session Initiation Protocol signaling as RTCP, utilize Real-time Transport Protocol to realize the transmission of service media stream; As the control signaling that realizes service quality QoS mechanism, the transmission quality of assurance audio/video data and the storage of monitor message are complete with the Session Initiation Protocol signaling; With Session Initiation Protocol as control signaling, when front end watch-dog and/or the initialization of remote monitoring client, consult the IPv6/IPv4 host-host protocol, with the transmission means of decision terminal address and signaling flow, and make the intercommunication that realizes Media Stream between IPv4 and two kinds of terminals of IPv6; Utilize the presence of Session Initiation Protocol signaling detection watch-dog, to keep connection and to implement management to connecting.
The front end watch-dog of described system is the sip terminal or the user agent of this SIP application system, be provided with respectively and Surveillance center, the remote monitoring client is carried out the SIP module of SIP session, and the medium process module of control video/audio transfer of data and processing, has following function: utilize the SIP signaling to realize the SIP registration, foundation/the dismounting of SIP session, transmitting SIP message, expansion Session Description Protocol SDP, so that select the IPv4/IPv6 address, the intercommunication and the Network address translators NAT that realize Media Stream between the IPv4/IPv6 terminal pass through, set up the RTP session of audio/video, transmit monitoring parameter to the communication server, finish the negotiation and the cipher key change of cryptographic algorithm.
The front end watch-dog of described system comprises: digital camera, by analog video camera and finish the access of monitoring on-the-spot various remote measurements, remote signals and the additional supervising device of the distant control function of relevant device as the video server of its peripheral hardware, and other front end supervising device that can match; The front end watch-dog has following function: to collection, compression and the encoding process of video and other monitor message, monitor message is uploaded to Surveillance center, receive the control command that Surveillance center assigns, to finish to the control of video camera and other supervising device, the processing of warning message; The enhancement function of this equipment comprises: the storage of this locality of video and/or warning message, and regularly mutual with Surveillance center reported the existing state of self and supported initiatively registration, the detection of various abnormal conditions and warning; Provide the data communication interface of Next Generation Internet, to support to insert Next Generation Internet;
The function of the video server in the described front end watch-dog is: the vision signal to analog video camera output is carried out analog-to-digital conversion, compressed encoding and transmission, and video storage, multiway images are switched, warning information is caught and the Equipment Control function, and the composition of described additional supervising device comprises transducer, transmitter and intelligent controller; Described other front end supervising device comprises audio collecting device, alarm input/output unit, The Cloud Terrace and The Cloud Terrace encoder, and its function is: finish audio collection, gate inhibition, infrared, smog, temperature and the alarm of other parameter, the rotation control of shooting The Cloud Terrace.
The front end watch-dog of described system, Surveillance center and remote monitoring client are supported following agreement: comprise Session Initiation Protocol, the Data Transport Protocol of agreement, RTP/RTCP agreement, TCP/UDP/IP H.323/H.245/H.223; Comprise H.261, H.263, H.263+, H.264, MPEG-2, MPEG-4, AVS, MJPEG video coding/decoding form and G711, G.723, G.728, G729, G.72A, the various media format protocol of EVRC, 3GPP-AMR audio coding/decoding form.
The Surveillance center of described system is to monitoring the on-the-spot operating platform of monitoring in real time of realizing, monitoring host computer, database server, the communication server and video display apparatus by mutual exchange of information are formed, and also comprise alarm linkage device and the matrix switcher that can match; Wherein the monitoring host computer and the communication server are respectively the sip terminal/user agent and the sip servers of this SIP application system; Described monitoring host computer is the man-machine interface of this supervisory control system, also be the sip terminal or the user agent of this SIP application system, be provided with the SIP module of carrying out the SIP session respectively with the communication server, front end watch-dog, and the medium process module of control multichannel video/audio transfer of data and processing, be responsible for each monitoring on-the-spot real time monitoring and control; The described communication server is the calling control hinge that this system is responsible for protocol adaptation, call proceeding, service agent, system management, and as system's external interface, realization and other system interconnect, and comprise the following function module: proxy module, redirection module, Registering modules, locating module, Media proxy module, administration module, UDP serve the D-DNS module to simple traversal mode STUN module, the DDNS of NAT; This communication server is responsible for image and the monitor message of real-time tandem from the front end watch-dog, and the function that responds the operation of remote monitoring client and provide authentification of user, monitor message processing and content to distribute; Described database server is used for storing video and other monitor message that digital camera, video server and other additional supervising device of front end watch-dog provide, store alarms, digital recording data and user profile; Described video display apparatus comprises: the display of monitoring host computer, video wall and large screen projection device; Described alarm linkage device is to be provided with in advance according to different situations by Surveillance center, or is fixedly installed by the controlled terminal station; This alarm linkage device is accepted the Long-distance Control and the alarm parameters adjustment of Surveillance center; Described matrix switcher is that the audio/video signal that will receive exports the different terminals that comprises projector, watch-dog and codec to, and the equipment that video and audio signal are switched and distributed: multi-channel video and audio signal are switched on arbitrary passage in the output channel, and be mutually independent between each output channel, or any one road signal switched on the multichannel output channel simultaneously show; This device can send video multiplex/audio-frequency information to a plurality of audio/video terminals, can accept high resolution R GB, VGA, the vision signal of composite video and S-video form, and vision signal is carried out the adjustment and the conversion of form size, image scaled or other parameter by customer requirements, finally export the VGA or the rgb signal of consolidation form.
Described Surveillance center has following function: the authentication service to session provides support, session connection between foundation, maintenance and dismounting front end watch-dog and the remote monitoring client, between front end watch-dog and remote monitoring client, consult the media delivery parameter, collecting charging information, and the online various states of Real Time Observation, grasp user and the identity of both call sides, toll breakdown certain user's session in case of necessity; To being positioned at the IPv4 network user of NAT device rear side, the Media proxy service is provided and transmits Media Stream; The instant message service is provided, and to the various policer operations of real-time reception, processing and the video playback of each on-site supervision information and other warning message, storage, distribution.
The remote monitoring client of described system is the watch-dog by the long-range access of communication network Surveillance center, also be the sip terminal/user agent of this SIP application system, be provided with the SIP module of carrying out the SIP session respectively with Surveillance center, front end watch-dog, and the medium process module of control multichannel video/audio transfer of data and processing, be responsible for the communication server, according to authorizing to monitoring on-the-spot realization telemonitoring, watch and video camera and other watch-dog being implemented controlled function by the mode access monitoring center of browser/server or client/server.
The operation supporting platform of described system is arranged in the NM server group of Virtual network operator, is used for whole monitoring system is realized that service operation supports and management; This operation supporting platform is provided with the open interface based on Session Initiation Protocol, is used for realizing respectively with front end watch-dog, video conferencing system, based on the intercommunication of the communication system of Streaming Media.
In order to achieve the above object, the present invention also provides a kind of implementation method of Active Eyes of dialogue-based initializtion protocol, it is characterized in that: comprise following operating procedure:
(1) remote monitoring client and front end watch-dog respectively to the communication server of Surveillance center, be that sip server sends register requirement, login this sip server;
(2) user requires to realize video monitoring by the invitation request of remote monitoring client forward end watch-dog initiation via the sip server forwarding;
(3) after sip server is received and invited request, confirm that by message body the user wishes to set up the front end watch-dog of inviting request, and return the invitation request responding by relevant front end watch-dog;
(4) whether the invitation request responding earlier the front end watch-dog returned of sip server is verified for authentication success message, return to the request initiator again: if the response of conversation request is an authentication success, then remote monitoring client and front end watch-dog carry out media formats to be consulted, and the forward end watch-dog transmits control message, after both sides set up session connection, transmission of video/audio medium stream and realize policer operation; If the response of this conversation request is an authentification failure, then sip server is refused this session invitation request, sends authentification failure message to the Terminal Server Client that sends request, informs this invitation request failure, EO;
(5) in monitor procedure, the user can send monitor command message to sip server by Terminal Server Client, and this message parameter comprises: the short message parameter of data packet head parameter, standard SIP short message parameter and the expansion be made up of every Control Parameter of video monitoring;
(6) after sip server receives monitor command message, earlier to Requested Party-front end watch-dog-transmission monitor command message request, after receiving that Requested Party is accepted the response of monitor command message, sip server is given Requested Party with the monitor command forwards, Requested Party is carried out corresponding policer operation according to the monitor command message content, send the SIP short message simultaneously between front end watch-dog and the remote monitoring client mutually, finish the every associative operation that comprises monitoring, alarm, control, information indicating;
(7) remote monitoring client forward end watch-dog stops the transmission and the policer operation of video/audio Media Stream after initiating to remove session connection request;
(8) remote monitoring client and/or front end watch-dog to sip server initiation session connection request, withdraw from this supervisory control system respectively.
The present invention is the extensive of a kind of dialogue-based initializtion protocol, can run, manageable Active Eyes, advantage of the present invention is: system configuration is simple, complete, Surveillance center and remote monitoring client are by the operation of Session Initiation Protocol and expansion short message access and control front end watch-dog, improved the fail safe of Surveillance center and remote monitoring client to the monitoring of front end watch-dog, on the basis that guarantees service quality, has good opening, flexibility, extensibility and cross-platform compatibility, make operator can utilize the existing network environment to realize applying on a large scale easily, eliminated the bottleneck of puzzlement traditional video surveillance network size expansion.In addition, the present invention adopts open Session Initiation Protocol as signaling protocol as the SIP application system, collection and the Surveillance center/remote monitoring client of not only being responsible for monitor session establishment of connection, session parameter negotiation, the dismounting that connects, charge information send and exchange the management of front end watch-dog and the signaling of control, and carry out necessary user's qualification certification before session foundation; Functions such as user management, service management also are provided.By this SIP application system, the keeper can set up session with far-end multimedia monitoring equipment (as video camera) and be connected with medium, the keeper can observe the picture material of multimedia monitoring equipment (as video camera) at far-end, can also carry out Long-distance Control to far-end multimedia monitoring equipment.In message transmitting procedure, adopt professional Session Initiation Protocol signaling flow and the business datum Media Stream sort pass mechanism that connects, user's establishment of connection, modification and termination are all passed through the connection management device of Surveillance center, follow-up business datum Media Stream is then realized point-to-point direct visit, can effectively reduce Surveillance center's load, make system strengthen autgmentability, effectively the large scale deployment of back-up system.Moreover the administration module in the sip server has the function that there is user conversation in administrative institute, can browse current all sessions and session both sides' relevant information, can remove session under announcement session both sides' not situation in case of necessity.In a word, system configuration of the present invention is simple, multiple functional, easy to operate, reliable, has good popularization and application prospect.
Description of drawings
Fig. 1 is that the structure that the present invention is based on the Active Eyes of conversation initialized protocol is formed schematic diagram.
Fig. 2 is the operating procedure block diagram that the present invention is based on the Active Eyes implementation method of conversation initialized protocol.
Fig. 3 the present invention is based on the interface schematic diagram between each assembly in the Active Eyes of conversation initialized protocol.
Fig. 4 is the hierarchical network topology structural representation that the present invention is based on the Active Eyes of conversation initialized protocol.
Fig. 5 the present invention is based on the Active Eyes of conversation initialized protocol and the interconnection and interflow schematic diagram of out of Memory transmission system.
Fig. 6 is an embodiment location registration process flow process sequential chart that the present invention is based on the Active Eyes of conversation initialized protocol.
Fig. 7 is an embodiment Register Cancel flow process sequential chart that the present invention is based on the Active Eyes of conversation initialized protocol.
Fig. 8 is that the flow process sequential chart is set up in an embodiment SIP session that the present invention is based on the Active Eyes of conversation initialized protocol.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Referring to Fig. 1, the present invention is a kind of Active Eyes of dialogue-based initializtion protocol, and wherein communication network comprises: IP internet, public switch telephone network PSTN, integrated services digital network ISDN, mobile radio communication; The also SIP application system of forming by communication network 1, front end watch-dog 2, Surveillance center 3 and remote monitoring client 4,5 five members of operation supporting platform.Wherein communication network 1 is to comprise the IP internet, the PSTN net, the multistage network topological structure that the scalability of ISDN net and mobile radio communication is good, this system is the core signaling protocol with open Session Initiation Protocol, realize system registry, set up monitor session, transmitting, monitoring message, remove the function of monitor session, and can expand the message body in the SIP short message, realize the system session parameter negotiation, the SIP short message transmission, monitoring parameter is adjusted, management and control front end watch-dog, gather charge information and extension facility type or increase new controlled function, to satisfy open expanded application demand and to utilize existing network to realize large-scale application.
In addition, this system and equipment thereof have following function: each equipment possesses IPv6 and/or IPv4 protocol stack, uses IPv6 or IPv4 protocol transmission SIP signaling, makes this system can self adaptation IPv6 and/or the multiprotocol network environment of IPv4; Session Initiation Protocol signaling flow and service media flow point are from transmission: front end watch-dog, remote monitoring client respectively with Surveillance center's transmitting SIP control signaling each other, follow-up service media stream then adopts point-to-point mode to transmit, to reduce the load of Surveillance center, the large scale deployment of enhanced system autgmentability and back-up system; Adopt the Session Initiation Protocol of expansion to realize the negotiation of cryptographic algorithm and the exchange of key, interactive information to communicating pair is carried out encryption, encryption to service media stream can stop that the hacker monitors the media data packet of transmission over networks, the system authentication function can avoid the hacker to intercept and capture SIP signaling address or the sip server/SIP client that disguises oneself as brings in and steals user profile, ensures user profile and communication security; With the control signaling of SIP signaling, provide the service of passing through of NAT for front end watch-dog and/or remote monitoring client as passing through NAT; Control signaling with the Session Initiation Protocol signaling as RTCP, utilize Real-time Transport Protocol to realize the transmission of service media stream; As the control signaling that realizes service quality QoS mechanism, the transmission quality of assurance audio/video data and the storage of monitor message are complete with the Session Initiation Protocol signaling; With Session Initiation Protocol as control signaling, when front end watch-dog and/or the initialization of remote monitoring client, consult the IPv6/IPv4 host-host protocol, with the transmission means of decision terminal address and signaling flow, and make the intercommunication that realizes Media Stream between IPv4 and two kinds of terminals of IPv6; Utilize the presence of Session Initiation Protocol signaling detection watch-dog, to keep connection and to implement management to connecting.
Introduce other each building block of this system below respectively:
Front end watch-dog 2 is sip terminal or user agents of this SIP application system, be provided with respectively and Surveillance center, the remote monitoring client is carried out the SIP module of SIP session, and the medium process module of control video/audio transfer of data and processing, its function is: utilize the SIP signaling to realize the SIP registration, foundation/the dismounting of SIP session, transmitting SIP message, expansion Session Description Protocol SDP, so that select the IPv4/IPv6 address, the intercommunication and the Network address translators NAT that realize Media Stream between the IPv4/IPv6 terminal pass through, set up the RTP session of audio/video, transmit monitoring parameter to the communication server; Finish the negotiation and the cipher key change of cryptographic algorithm.Front end watch-dog 2 comprises: digital camera 21, by analog video camera 221 and finish the access of monitoring on-the-spot various remote measurements, remote signals and the additional supervising device 222 of the distant control function of relevant device as the video server 22 of its peripheral hardware and other front end supervising device 23 that can match.The basic function of front end watch-dog 2 is: to collection, compression and the encoding process of video and other monitor message, monitor message is uploaded to Surveillance center 3, receive the control command that Surveillance center 3 assigns, to finish to the control of video camera and other watch-dog, the processing of warning message.Its enhancement function comprises: this locality storage of video and/or warning message, in case principal vertical line roadlock plug causes losing of field data; Regularly mutual with Surveillance center 3 reported the existing state of self and supported the initiatively detection and the warning of registration, various abnormal conditions; Provide the data communication interface of Next Generation Internet, to support the access of Next Generation Internet.
Wherein video server 22 is used for the vision signal of analog video camera 221 output is carried out analog-to-digital conversion, compressed encoding and transmission, and video storage, multiway images are switched, warning information is caught and the Equipment Control function.The additional supervising device of being made up of transducer, transmitter and intelligent controller 222 is used to finish monitoring on-the-spot various remote measurements, the access of remote signals and the distant control function of relevant device.Other front end supervising device 23 functions of being made up of audio collecting device, alarm input-output equipment, The Cloud Terrace and The Cloud Terrace encoder etc. are: finish audio collection, and the gate inhibition, infrared, smog, temperature and the alarm of other parameter, the rotation of shooting and sensing device is controlled.
The function of Surveillance center 3 is: the authentication service to session provides support, session connection between foundation, maintenance and dismounting front end watch-dog and the remote monitoring client, between front end watch-dog and remote monitoring client, consult the media delivery parameter, collecting charging information, and the online various states of Real Time Observation, grasp user and the identity of both call sides, toll breakdown certain user's session in case of necessity; To being positioned at the IPv4 network user of NAT device rear side, the Media proxy service is provided and transmits Media Stream; The instant message service is provided, and to the various policer operations of real-time reception, processing and the video playback of each on-site supervision information and other warning message, storage, distribution.
Relevant apparatus in front end watch-dog 2 in the system of the present invention, Surveillance center 3 and the remote monitoring client 4 is all supported following agreement:
Data Transport Protocol: Session Initiation Protocol, H.323/H.245/H.223 agreement, RTP/RTCP agreement, TCP/UDP/IP agreement etc.;
Various media format protocol: H.261, H.263, H.263+, H.264, MPEG-2, MPEG-4, video coding/decoding form such as AVS, MJPEG and G.711, G.723, G728, G.729, audio coding/decoding form such as G72A, EVRC, 3GPP-AMR.
Referring to Fig. 2, introduce the implementation method of the Active Eyes that the present invention is based on conversation initialized protocol, comprise following operating procedure:
(1) remote monitoring client and front end watch-dog respectively to the communication server of Surveillance center, be that sip server sends register requirement, login this sip server;
(2) user requires to realize video monitoring by the invitation request of remote monitoring client forward end watch-dog initiation via the sip server forwarding;
(3) after sip server is received and invited request, confirm that by message body the user wishes to set up the front end watch-dog of inviting request, and return the invitation request responding by relevant front end watch-dog;
(4) whether the invitation request responding earlier the front end watch-dog returned of sip server is verified for authentication success message, return to the request initiator again: if the response of conversation request is an authentication success, then remote monitoring client and front end watch-dog carry out media formats to be consulted, and the forward end watch-dog transmits control message, after both sides set up session connection, transmission of video/audio medium stream and realize policer operation; If the response of this conversation request is an authentification failure, then sip server is refused this session invitation request, sends authentification failure message to the Terminal Server Client that sends request, informs this invitation request failure, EO;
(5) in monitor procedure, the user can send monitor command message to sip server by Terminal Server Client, and this message parameter comprises: the short message parameter of data packet head parameter, standard SIP short message parameter and the expansion be made up of every Control Parameter of video monitoring;
(6) after sip server receives monitor command message, earlier to Requested Party-front end watch-dog-transmission monitor command message request, after receiving that Requested Party is accepted the response of monitor command message, sip server is given Requested Party with the monitor command forwards, Requested Party is carried out corresponding policer operation according to the monitor command message content, send the SIP short message simultaneously between front end watch-dog and the remote monitoring client mutually, finish the every associative operation that comprises monitoring, alarm, control, information indicating;
(7) remote monitoring client forward end watch-dog stops the transmission and the policer operation of video/audio Media Stream after initiating to remove session connection request;
(8) remote monitoring client and/or front end watch-dog to sip server initiation session connection request, withdraw from this supervisory control system respectively.
Referring to Fig. 3, introduce the business interface of Active Eyes of the present invention respectively, in the actual operation, Surveillance center 3 and operation supporting platform 5 can be arranged in the same physical entity.Dotted line is represented optional interface among the figure.
(1) Ia interface: the interface between front end watch-dog 2 and the Surveillance center 3, information spinner by the transmission of SIP signaling in the Ia interface will comprise: be sent to the video/audio and the warning message of Surveillance center 3 by front end watch-dog 2, and Surveillance center 3 is sent to the control information of front end watch-dog 2; The unilateral authentication or the two-way authentication of Ia interface optional support Surveillance center and front end watch-dog.
(2) Ib interface: the interface between Surveillance center 3 and the remote monitoring client 4, when remote monitoring client 4 is browsed the image at monitoring scene by Surveillance center 3, if the control command of the 4 pairs of front end watch-dogs 2 of information spinner remote monitoring client that transmit by the SIP signaling on the Ib interface.The Ib interface provides the unilateral authentication or the two-way authentication function of 3 pairs of remote monitoring clients 4 of Surveillance center.Communicate between Surveillance center 3 and the remote monitoring client 4, be used to realize the monitoring remote video of C/S mode or B/S mode.
When Surveillance center 3 and remote monitoring client 4 adopts the C/S modes to communicate, after the legitimacy of confirming remote monitoring client 4, realize that by the SIP signaling process description of its communication is as follows:
1. the communication server of Surveillance center 3 starts, and waits for the sign-on access request of remote monitoring client 4;
2. after receiving the access request signal of remote monitoring client 4, the communication server of Surveillance center 3 and monitoring host computer are set up data channel and control signalling path with monitor client 4 respectively;
3. intercommunication, during the communication server and monitoring host computer monitor the control command of remote monitoring client 4 respectively so that carry out associative operations such as camera zoom, rotation and cradle head control;
4. after remote monitoring client 4 finished communication, logic channel was closed.
When Surveillance center 3 and remote monitoring client 4 adopted the B/S modes to communicate, after the legitimacy of confirming the remote monitoring client, its communication process was summarized as follows:
1. the Web server of Surveillance center 3 is gone up the http request of monitoring remote monitoring client 4 at its tcp port (being generally 80 ports);
2. the Web browser of remote monitoring client 4 is set up http with the Web server of Surveillance center 3 and is connected;
3. the Web browser of remote monitoring client 4 sends to the http solicited message Web server of Surveillance center 3;
4. the server process of Surveillance center 3 should be logined browse request, and returned response message to client computer;
5.Web stopping http, server connects.
(3) Ic interface: the interface between front end watch-dog 2 and the remote monitoring client 4, if realize that by the SIP signaling information spinner that transmits is sent to the video/audio and the warning message of Surveillance center 3 by front end watch-dog 2 on the Ic interface.
After obtaining Surveillance center's 3 authentications, remote monitoring client 4 can be directly and front end watch-dog 2 set up media channel, transmission video/audio and other monitor message; The communication server by Surveillance center 3 sends to front end watch-dog 2 with control command simultaneously, orders it to carry out corresponding operation.Realize that by the SIP signaling its communication process is summarized as follows:
1. the communication server of Surveillance center 3 starts, and waits for the access request of remote monitoring client 4;
2. the communication server is received the request signal of remote monitoring client 4, carry out subscription authentication, after authentication, set up control channel with client 4, and between the remote monitoring client 4 and the communication server, consult to generate best route (can take the circumstances into consideration away distribution or direct route) from remote monitoring client 4 to front end watch-dog 2;
3. between remote monitoring client 4 and front end watch-dog 2, form media channel according to newly-generated route.
4. during the intercommunication, the communication server is monitored the control command of remote monitoring client 4, carry out associative operations such as camera zoom, rotation and cradle head control, and the forward end watch-dog returns the response of control command;
5. after remote monitoring client 4 finishes communication, close media channel and logic channel respectively.
(4) Id interface: the interface between front end watch-dog 2 and the operation supporting platform 5 is used to provide the functions such as authentication of 5 pairs of front end watch-dogs 2 of operation supporting platform.
(5) Ie interface: the interface between Surveillance center 3 and the operation supporting platform 5 is used to provide the transmitting function of user profile, charge information and management information between Surveillance center 3 and the operation supporting platform 4.
(6) If interface: the interface between remote monitoring client 4 and the operation supporting platform 5 is used to provide functions such as the authentification of user authentication of 5 pairs of remote monitoring clients 4 of operation supporting platform and service inquiry.
Following brief description system of the present invention forms the execution mode of the operation system that can run:
In order to make up a large-scale Active Eyes, as other public telecommunication network, system of the present invention carries out the classification networking according to the regional extent and the service needed of monitoring, promptly adopts multilevel monitor center framework.Area monitoring branch center conduct wherein is to the controlling platform of a plurality of monitoring field conduct monitoring management of one's respective area compass of competency, need report monitored condition to its higher level Surveillance center, and by higher level Surveillance center business be carried out in each branch center of its subordinate and gather, authenticate and manage.For operation and the unified management that realizes national monitoring remote video business, must carry out the classification networking to the monitoring business system, Fig. 4 has showed three levels of organization's structure of this business operation system: national Surveillance center, area monitoring center and peripheral Surveillance center, each edge Surveillance center can manage a plurality of front end watch-dogs.
If manage, run this monitoring remote video operation system by telecom operators, then needing increases following correlation function at operation supporting platform: service fulfillment, authentification of user and rights management, system management, network management, equipment control, charging and accounting management etc.
If provide network environment by telecom operators, link is rented to the user (or form private network by the virtual private network mode), when managing and safeguarding, can following function be set: service fulfillment, authentification of user and rights management, system management, charging and accounting management etc. in Surveillance center by user oneself.
In order to satisfy applying and development need of video monitoring system, video monitoring system of the present invention remains with open interface, satisfying and to adapt to and the front end watch-dog of other different manufacturers and the interconnection and interflow requirement of Surveillance center, and may increase gradually from now on video conferencing system, based on the business need of the intercommunication of the communication system of Streaming Media etc.Fig. 5 has showed a kind of intercommunication situation schematic diagram of system of the present invention and other information systems.
In order to realize the intercommunication of front end watch-dog 2 and Surveillance center 3, provide standard SDK interface by the manufacturer of front end watch-dog 2, the monitor supervision platform of being finished third party's front end watch-dog by Surveillance center 3 inserts.
In order to realize the intercommunication with video conferencing system, need between the MCU of the communication server of Surveillance center 3 and video conferencing system, realize IWF, and on the communication protocol aspect, support the H.323 intercommunication of agreement or the intercommunication of Session Initiation Protocol.
In order to realize and intercommunication, need between the server of the communication server of Surveillance center 3 and stream media system, to realize IWF, and on the communication protocol aspect, support the intercommunication of RTP/RTCP/RTSP agreement based on the communication system of Streaming Media.
The implementation method of Active Eyes of the present invention can be used as a kind of new value-added telecom services of opening towards the public, runing, and briefly introduces this professional typical treatment process below:
1, service operation unit disposes a considerable amount of web cameras in certain setting range, and each equipment in the system is carried out basic configuration;
2, monitor staff's (being the user) application video monitoring service can apply for that one or more web cameras monitor the production video image, and service operation unit disposes for it carries out the user;
3, the monitor staff operates the remote monitoring client, to system input usemame/password (or digital certificate etc.), carries out system registry by the SIP signaling;
4, the monitor staff utilizes the URI address of remote monitoring client to Surveillance center's fan-in network video camera of system, initiates access request by the SIP signaling;
5, the authentication parameter (usemame/password that provides according to the remote monitoring client of the Access Management of Surveillance center, digital certificate etc.), its user's registration information with registration is in advance compared, judge by this and authenticate this user and whether be authorized to that the qualification that is connected this web camera is arranged;
6, by after the authentication, between monitor client, Surveillance center and web camera, carry out the negotiation of media channel and network link respectively by the SIP signaling, confirm the essential information of this connection;
7, between monitor client, Surveillance center and web camera, carry out medium and be connected, make the user can check the video image of web camera;
8, the Access Management of operation supporting platform manages connection in the medium connection procedure;
9, after connection finished, Access Management write down this and connects performance, is audit in the future, and work such as inquiry stay basic data.
Briefly introduce the concrete operations step of some handling processes in the SIP application system of the present invention (comprise location registration process flow process (referring to Fig. 6), Register Cancel flow process (referring to Fig. 7), SIP session set up flow process (referring to Fig. 8)) below in conjunction with accompanying drawing, further specify the details of the associative operation of this SIP application system.
Interoperability agreement between video monitoring system of the present invention is installed as each with Session Initiation Protocol, each device (relevant apparatus that comprises front end watch-dog, remote monitoring client, Surveillance center) all must could be visited other devices or accessed after the SIP registrar server registration.
Referring to Fig. 3, an embodiment who introduces this register flow path is: 1, the front end watch-dog sends register requirement to SIP registrar server; 2, SIP registrar server requires this watch-dog is carried out qualification certification; 3, the front end watch-dog initiates to have the register requirement of authentication; 4, the positional information of SIP registrar server record front end watch-dog, and return the response of succeeding in registration.
If the front end watch-dog is found oneself to be positioned at NAT, must send the UDP message bag that content is a character string " alive " to SIP registrar server every setting-up time, the NAT mapping that produces when registering for the first time to keep guarantees that sip proxy server can call out this front end watch-dog.SIP registrar server can be ignored the UDP message bag of content for " alive ", can not take the processing resource.
Referring to Fig. 4, an embodiment operating procedure introducing this logout flow path is: 1, the front end watch-dog is initiated de-registration request; 2, SIP registrar server requires authentication; 3, the front end watch-dog initiates to have the de-registration request of authentication; 4, SIP registrar server is removed location information of terminals, and returns the cancellation success response.
In this SIP application system, the front end watch-dog is a controlled device, can not initiatively initiate to invite (INVITE)/remove (BYE) request, can only respond or refuse from sip terminal or user agent's remote monitoring client or the invitation (INVITE) of mobile device/dismounting (BYE) request.Referring to Fig. 5, introduce the operating procedure that an embodiment of flow process (the session flow process of remote monitoring client-access front end watch-dog) set up in session:
(1) remote monitoring client sends to sip proxy server and invites request, comprises expansion SDP agreement in its message body;
(2) sip proxy server returns response, searches the locus of front end watch-dog simultaneously, and the request of should inviting is transmitted to the front end watch-dog;
(3) the front end watch-dog returns response, shows that it receives the request of inviting;
(4) front end watch-dog described media capability of SDP agreement that invite request message is carried and the local situation coupling of shaking hands negotiates the medium interaction capabilities that both sides have, and returns to sip proxy server by success response 200; If this front end watch-dog has reached the service limit, Video service can not be provided, then return failure response 603, the end operation flow process;
(5) sip proxy server is transmitted to the remote monitoring client with success response 200;
(6) remote monitoring client is returned the response ACK of oneself, shows oneself to receive 200 responses, and both sides set up the SIP session connection;
(7) the front end watch-dog sends video data stream according to the video media stream format that both sides consult to the remote monitoring client, realizes policer operation.
In SIP application system of the present invention, no matter remote monitoring client still is the front end watch-dog, has only in the other side's SDP message and the local SDP message all to contain the IPv6 address, just enables IPv6 and transmits data; Otherwise just transmit data with IPv4.If equipment is in NAT, then equipment relies on Simple Traversal of UDP Through Network Address Translators to obtain the outside public network IP address of NAT.
In order to realize the intercommunication of Media Stream between the device that makes IPv4/IPv6, the present invention expands the message body of SDP agreement.In addition, all be directly transmission on the net at present based on both sides' media data flow of the point-to-point communication of SIP, do not pass through encryption, so just increase the possibility that media data is divulged a secret, so must adopt data encryption mechanism to ensure communication security.The present invention realizes the negotiation of cryptographic algorithm and the exchange of key by expansion Session Initiation Protocol signaling.The symmetrical expression cryptographic algorithm is adopted in encryption to media data flow, so communication two party all must have both sides' key and the used cryptographic algorithm of both sides simultaneously.
The present invention has carried out experimental enforcement test on public network, in an embodiment by SIP short message and extended message thereof, realized the multi-functional onsite monitoring function of Active Eyes, comprise: the remote monitoring client monitors the front end watch-dog, obtain online information and other information (the media data stream type and the quantity of front end watch-dog, visiting all Terminal Server Clients of front end watch-dog, available bandwidth, whether be in alarm status etc.), the video camera of remote monitoring client control front end watch-dog and the rotational angle/position of The Cloud Terrace, the remote monitoring client is checked the daily record of front end watch-dog and the network parameter of front end watch-dog is set that the front end watch-dog sends the notice that alarm generation/alarm is eliminated; The remote monitoring client revise the front end watch-dog operating time, increase/deletion/modification front end watch-dog the user and restart front end watch-dog or the like.In a word, test is successful, has realized goal of the invention.
Claims (11)
1, a kind of Active Eyes of dialogue-based initializtion protocol, it is characterized in that: the application system of the Session initiation protocol SIP that described system is made up of communication network, front end watch-dog, Surveillance center and remote monitoring client, five members of operation supporting platform, wherein communication network comprises: IP internet, public switch telephone network PSTN, integrated services digital network ISDN, mobile radio communication; This system is the core signaling protocol with open Session Initiation Protocol, realize system registry, set up monitor session, transmitting, monitoring message, remove the function of monitor session, and can expand the message body in the SIP short message, realize system session parameter negotiation, SIP short message transmission, monitoring parameter adjustment, management and control front end watch-dog, gather charge information and extension facility type or increase new controlled function, to satisfy open expanded application demand and to utilize existing network to realize large-scale application.
2, Active Eyes according to claim 1 is characterized in that: described system and equipment wherein further have following function:
Each equipment possesses IPv6 and/or IPv4 protocol stack, uses IPv6 or IPv4 protocol transmission SIP signaling, makes this system can self adaptation IPv6 and/or the multiprotocol network environment of IPv4;
Session Initiation Protocol signaling flow and service media flow point are from transmission: front end watch-dog, remote monitoring client respectively with Surveillance center's transmitting SIP control signaling each other, follow-up service media stream then adopts point-to-point mode to transmit, to reduce the load of Surveillance center, the large scale deployment of enhanced system autgmentability and back-up system;
Adopt the Session Initiation Protocol of expansion to realize the negotiation of cryptographic algorithm and the exchange of key, interactive information to communicating pair is carried out encryption, encryption to service media stream can stop that the hacker monitors the media data packet of transmission over networks, the system authentication function can avoid the hacker to intercept and capture SIP signaling address or the sip server/SIP client that disguises oneself as brings in and steals user profile, ensures user profile and communication security;
With the control signaling of SIP signaling, provide the service of passing through of NAT for front end watch-dog and/or remote monitoring client as passing through NAT; Control signaling with the Session Initiation Protocol signaling as RTCP, utilize Real-time Transport Protocol to realize the transmission of service media stream; As the control signaling that realizes service quality QoS mechanism, the transmission quality of assurance audio/video data and the storage of monitor message are complete with the Session Initiation Protocol signaling; With Session Initiation Protocol as control signaling, when front end watch-dog and/or the initialization of remote monitoring client, consult the IPv6/IPv4 host-host protocol, with the transmission means of decision terminal address and signaling flow, and make the intercommunication that realizes Media Stream between IPv4 and two kinds of terminals of IPv6; Utilize the presence of Session Initiation Protocol signaling detection watch-dog, to keep connection and to implement management to connecting.
3, Active Eyes according to claim 1 and 2, it is characterized in that: the front end watch-dog of described system is the sip terminal or the user agent of this SIP application system, be provided with respectively and Surveillance center, the remote monitoring client is carried out the SIP module of SIP session, and the medium process module of control video/audio transfer of data and processing, has following function: utilize the SIP signaling to realize the SIP registration, foundation/the dismounting of SIP session, transmitting SIP message, expansion Session Description Protocol SDP, so that select the IPv4/IPv6 address, the intercommunication and the Network address translators NAT that realize Media Stream between the IPv4/IPv6 terminal pass through, set up the RTP session of audio/video, transmit monitoring parameter to the communication server, finish the negotiation and the cipher key change of cryptographic algorithm.
4, Active Eyes according to claim 1, it is characterized in that: the front end watch-dog of described system comprises: digital camera, by analog video camera and finish the access of monitoring on-the-spot various remote measurements, remote signals and the additional supervising device of the distant control function of relevant device as the video server of its peripheral hardware, and other front end supervising device that can match; The front end watch-dog has following function: to collection, compression and the encoding process of video and other monitor message, monitor message is uploaded to Surveillance center, receive the control command that Surveillance center assigns, to finish to the control of video camera and other supervising device, the processing of warning message; The enhancement function of this equipment comprises: the storage of this locality of video and/or warning message, and regularly mutual with Surveillance center reported the existing state of self and supported initiatively registration, the detection of various abnormal conditions and warning; Provide the data communication interface of Next Generation Internet, to support to insert Next Generation Internet;
5, Active Eyes according to claim 4, it is characterized in that: the function of the video server in the described front end watch-dog is: the vision signal to analog video camera output is carried out analog-to-digital conversion, compressed encoding and transmission, and video storage, multiway images are switched, warning information is caught and the Equipment Control function, and the composition of described additional supervising device comprises transducer, transmitter and intelligent controller; Described other front end supervising device comprises audio collecting device, alarm input/output unit, The Cloud Terrace and The Cloud Terrace encoder, and its function is: finish audio collection, gate inhibition, infrared, smog, temperature and the alarm of other parameter, the rotation control of shooting The Cloud Terrace.
6, Active Eyes according to claim 4 is characterized in that: the front end watch-dog of described system, Surveillance center and remote monitoring client are supported following agreement: comprise Session Initiation Protocol, the Data Transport Protocol of agreement, RTP/RTCP agreement, TCP/UDP/IP H.323/H.245/H.223; Comprise H.261, H.263, H.263+, H.264, MPEG-2, MPEG-4, AVS, MJPEG video coding/decoding form and G.711, G.723, G.728, G.729, G.72A, the various media format protocol of EVRC, 3GPP-AMR audio coding/decoding form.
7, Active Eyes according to claim 1, it is characterized in that: the Surveillance center of described system is to monitoring the on-the-spot operating platform of monitoring in real time of realizing, monitoring host computer, database server, the communication server and video display apparatus by mutual exchange of information are formed, and also comprise alarm linkage device and the matrix switcher that can match; Wherein the monitoring host computer and the communication server are respectively the sip terminal/user agent and the sip servers of this SIP application system; Described monitoring host computer is the man-machine interface of this supervisory control system, also be the sip terminal or the user agent of this SIP application system, be provided with the SIP module of carrying out the SIP session respectively with the communication server, front end watch-dog, and the medium process module of control multichannel video/audio transfer of data and processing, be responsible for each monitoring on-the-spot real time monitoring and control; The described communication server is the calling control hinge that this system is responsible for protocol adaptation, call proceeding, service agent, system management, and as system's external interface, realization and other system interconnect, and comprise the following function module: proxy module, redirection module, Registering modules, locating module, Media proxy module, administration module, UDP serve the D-DNS module to simple traversal mode STUN module, the DDNS of NAT; This communication server is responsible for image and the monitor message of real-time tandem from the front end watch-dog, and the function that responds the operation of remote monitoring client and provide authentification of user, monitor message processing and content to distribute; Described database server is used for storing video and other monitor message that digital camera, video server and other additional supervising device of front end watch-dog provide, store alarms, digital recording data and user profile; Described video display apparatus comprises: the display of monitoring host computer, video wall and large screen projection device; Described alarm linkage device is to be provided with in advance according to different situations by Surveillance center, or is fixedly installed by the controlled terminal station; This alarm linkage device is accepted the Long-distance Control and the alarm parameters adjustment of Surveillance center; Described matrix switcher is that the audio/video signal that will receive exports the different terminals that comprises projector, watch-dog and codec to, and the equipment that video and audio signal are switched and distributed: multi-channel video and audio signal are switched on arbitrary passage in the output channel, and be mutually independent between each output channel, or any one road signal switched on the multichannel output channel simultaneously show; This device can send video multiplex/audio-frequency information to a plurality of audio/video terminals, can accept high resolution R GB, VGA, the vision signal of composite video and S-video form, and vision signal is carried out the adjustment and the conversion of form size, image scaled or other parameter by customer requirements, finally export the VGA or the rgb signal of consolidation form.
8, according to claim 1 or 7 described Active Eyes, it is characterized in that: described Surveillance center has following function: the authentication service to session provides support, session connection between foundation, maintenance and dismounting front end watch-dog and the remote monitoring client, between front end watch-dog and remote monitoring client, consult the media delivery parameter, collecting charging information, and the online various states of Real Time Observation, grasp user and the identity of both call sides, toll breakdown certain user's session in case of necessity; To being positioned at the IPv4 network user of NAT device rear side, the Media proxy service is provided and transmits Media Stream; The instant message service is provided, and to the various policer operations of real-time reception, processing and the video playback of each on-site supervision information and other warning message, storage, distribution.
9, Active Eyes according to claim 1, it is characterized in that: the remote monitoring client of described system is the watch-dog by the long-range access of communication network Surveillance center, also be the sip terminal/user agent of this SIP application system, be provided with respectively and Surveillance center, the front end watch-dog carries out the SIP module of SIP session, and the medium process module of control multichannel video/audio transfer of data and processing, be responsible for the communication server, according to authorizing to monitoring the on-the-spot telemonitoring of realizing by the mode access monitoring center of browser/server or client/server, watch and video camera and other watch-dog are implemented controlled function.
10, Active Eyes according to claim 1 is characterized in that: the operation supporting platform of described system is arranged in the NM server group of Virtual network operator, is used for whole monitoring system is realized that service operation supports and management; This operation supporting platform is provided with the open interface based on Session Initiation Protocol, is used for realizing respectively with front end watch-dog, video conferencing system, based on the intercommunication of the communication system of Streaming Media.
11, a kind of implementation method of Active Eyes of dialogue-based initializtion protocol is characterized in that: comprise following operating procedure:
(1) remote monitoring client and front end watch-dog respectively to the communication server of Surveillance center, be that sip server sends register requirement, login this sip server;
(2) user requires to realize video monitoring by the invitation request of remote monitoring client forward end watch-dog initiation via the sip server forwarding;
(3) after sip server is received and invited request, confirm that by message body the user wishes to set up the front end watch-dog of inviting request, and return the invitation request responding by relevant front end watch-dog;
(4) whether the invitation request responding earlier the front end watch-dog returned of sip server is verified for authentication success message, return to the request initiator again: if the response of conversation request is an authentication success, then remote monitoring client and front end watch-dog carry out media formats to be consulted, and the forward end watch-dog transmits control message, after both sides set up session connection, transmission of video/audio medium stream and realize policer operation; If the response of this conversation request is an authentification failure, then sip server is refused this session invitation request, sends authentification failure message to the Terminal Server Client that sends request, informs this invitation request failure, EO;
(5) in monitor procedure, the user can send monitor command message to sip server by Terminal Server Client, and this message parameter comprises: the short message parameter of data packet head parameter, standard SIP short message parameter and the expansion be made up of every Control Parameter of video monitoring;
(6) after sip server receives monitor command message, earlier to Requested Party-front end watch-dog-transmission monitor command message request, after receiving that Requested Party is accepted the response of monitor command message, sip server is given Requested Party with the monitor command forwards, Requested Party is carried out corresponding policer operation according to the monitor command message content, send the SIP short message simultaneously between front end watch-dog and the remote monitoring client mutually, finish the every associative operation that comprises monitoring, alarm, control, information indicating;
(7) remote monitoring client forward end watch-dog stops the transmission and the policer operation of video/audio Media Stream after initiating to remove session connection request;
(8) remote monitoring client and/or front end watch-dog to sip server initiation session connection request, withdraw from this supervisory control system respectively.
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