CN101242665A - A switching method for multimedia session continuity - Google Patents
A switching method for multimedia session continuity Download PDFInfo
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Abstract
A multimedia session continuity switching method, user terminal UE-A establishes multimedia session S between access network A and user terminal UE-B; before initializing multimedia session continuity switching, UE-A sends switching instruction message to MMSC-AS; MMSC-AS acquires switching scenario information of the mentioned multimedia session continuity switching according to multimedia session switching information contained in the information, and carries out subsequent processing according to different switching scenario after receiving call establishing request for audio switching initiated by UE-A. The mentioned multimedia session continuity switching method switches speech to CS domain of access network B. Applying the inventive method, MMSC-AS acquires whether to wait for SIP session request of PS domain related to switching under receiving switching request from CS domain in advance, which saves time needed for the multimedia session continuity switching.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of IP (network interconnection agreement, InternetProtocol) switching method for multimedia session continuity in the IP multimedia subsystem, IMS (IP Multimedia Core Network Subsystem is called for short IMS).
Background technology
IMS is by third generation partner program (3rd Generation Partnership Project, abbreviation 3GPP) a kind of IP-based network framework that proposes, it has made up an opening and service environment flexibly, supports multimedia application, and provides abundant multimedia service for the user.
IMS is based on the communication network framework of IP, irrelevant with access technology, except being GPRS (General Packet Radio Service, GPRS), WLAN (Wireless LocalArea Network, WLAN (wireless local area network)) etc. packet access network provides outside the business, can also be GSM (Global System for Mobile communications, global system for mobile communications), UMTS mobile cellular networks such as (Universal Mobile Telecommunications System, unified mobile communcations systems) provides professional.
Mobile cellular network such as GSM, UMTS adopts circuit-switched technology, is called circuit (CircuitSwitched is called for short CS) territory, can provide basic speech business for the user, and based on the supplementary service of speech business.When IMS was inserted in the CS territory, it developed into a kind of access way, and business provides by IMS is unified fully, and this technology is called IMS centralized traffic (IMS Centralized Service is called for short ICS).
(User Equipment UE) need keep the continuity of Multimedia session to user terminal under various access waies.At this moment, the Multimedia session of UE not only will keep continuity when switching between the packet-switched domain (Packet Switch is called for short PS), simultaneously will be in PS territory and CS territory, keep continuity in the switching in PS territory and PS territory+CS territory.Guarantee that this successional technology is called IMS multimedia conversation continuity (Multimedia Session Continuity is called for short MMSC).
In the MMSC technology, have a kind of like this handoff scenario: UE carries out Multimedia session at Access Network A, this Access Network provides the PS territory (PS1 territory) of (Voice over IP, the IP-based voice) ability that has VoIP, and this moment, voice and other multi-medium data all were carried in the PS1 territory; For a certain reason (as, wireless signal variation, reasons such as charging), UE need switch to Access Network B, and the PS territory of Access Network B (PS2 territory) do not have the VoIP ability, and perhaps Access Network B has only the CS territory, voice must be carried on the CS territory, and other multi-medium data need be switched to the PS2 territory.
Fig. 1 is that IMS multimedia conversation continuity of the prior art switches the method flow diagram of (all handoff scenario).In Fig. 1, user terminal A (UE-A) has been set up Multimedia session with remote subscriber terminal (UE-B) on the PS territory (PS1 territory) of Access Network A; This moment, UE-A needed to switch to Access Network B for a certain reason; Wherein, voice need switch to the CS territory of Access Network B, and all the other multimedia groupwares need switch to the PS2 territory of Access Network B.As shown in Figure 1, this method comprises the steps:
101) the UE-A decision switches to the CS territory with voice, and all the other multimedia groupwares switch to the PS2 territory;
102) UE-A initiates SIP (Session Initial Protocol, initial session protocol) conversation request in the PS2 territory, and this request sends to the S-CSCF (Serving-CSCF, service-call session control function) of user attaching network;
Comprise in the above-mentioned conversation request: sign (Domain Transfer Identity is called for short VDI) and Multimedia session handover information are switched in the territory; Wherein, comprise switching type information in the Multimedia session handover information, can know the assembly (voice and other multimedia groupware) that need switch by this switching type information.
103) S-CSCF transmits above-mentioned SIP conversation request according to initial filter standard or norm (initial Filter Criteria is called for short iFC) to MMSC AS (Application Server, application server);
104) MMSC AS knows that according to VDI needs carry out multimedia conversation continuity and switch, and knows that according to the Multimedia session handover information needs continue to wait for the handoff request in CS territory;
105) UE-A makes a call in the CS territory to set up and asks, and the called number of this request uses territory Handover Number (Domain Transfer Number is called for short VDN), and this request is addressed to the ICS node;
106) receive above-mentioned setup requests after, the ICS node is initiated the SIP conversation request, the called number of this request is VDN, this request is addressed to S-CSCF;
107) S-CSCF transmits above-mentioned SIP conversation request according to iFC to MMSC AS;
108～110) after MMSC AS receives the conversation request message of step 103 and step 107, merge this two conversation request, and by send the session of Re-INVITE information updating to far-end (UE-B);
111～114) MMSC AS receives that finishing session after the 200 OK message that far-end (UE-B) sends sets up flow process;
115～116) MMSC AS discharges original session in the PS1 territory by sending Bye (goodbye) message.
In the MMSC technology, there are following three kinds of handoff scenario:
One, all switch (as shown in Figure 1): when switching, MMSC AS can receive the SIP conversation request in PS2 territory.
Two, part is switched: the multimedia groupware except that voice is retained in the PS1 territory; MMSC AS can receive the SIP conversation request in PS1 territory.
Three, part is switched: voice are switched to the CS territory of Access Network B, all the other multimedia groupwares deletions; This moment, MMSC AS may receive Bye (goodbye) message of sending in the PS1 territory, certainly also may be owing to reasons such as signaling mistake or wireless signal covering can not receive Bye message.
In sum, because the handoff request in PS territory (is promptly initiated from the PS territory, carry the SIP conversation request of VDI) in can carry the Multimedia session handover information, therefore, if receive the handoff request (step 103) in PS territory earlier, then MMSC AS can judge whether the handoff request (promptly initiate from the CS territory, carry the setup requests of VDN and follow-up SIP conversation request) in needs wait CS territory according to the Multimedia session handover information; But, because step 102 and 105 can concurrently be carried out, and can't carry the Multimedia session handover information in the CS territory setup requests in the step 105, therefore, if receive the handoff request in CS territory earlier, MMSC AS can't judge the concrete scene that current multimedia conversation continuity switches, and therefore can't carry out subsequent treatment.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the deficiencies in the prior art, and when a kind of handoff request that formerly receives the CS territory was provided, MMSC AS can be known the switching method for multimedia session continuity of current handoff scenario.
In order to address the above problem, the invention provides a kind of switching method for multimedia session continuity, user terminal UE-A has set up Multimedia session S at Access Network A and user terminal UE-B; Before the switching of initiating multimedia conversation continuity, UE-A sends switch indicating information to MMSC AS; MMSCAS is known the handoff scenario information that described multimedia conversation continuity switches according to the Multimedia session handover information that comprises in this message, and after carrying out setup requests that voice switch in being used to of receiving that UE-A initiates, carry out the subsequent treatment that multimedia conversation continuity switches according to different handoff scenario; The switching of described multimedia conversation continuity switches to voice in the CS territory of Access Network B.
In addition, described MMSC AS sends acknowledge message to UE-A after receiving described switch indicating information;
After UE-A receives this acknowledge message, initiate to be used to carry out the setup requests that described voice switch in the CS territory of Access Network B; The called number of this setup requests is VDN.
In addition, described handoff scenario information shows that described switching is the CS territory that voice is switched to Access Network B, with the PS territory deletion of other multimedia groupware from Access Network A;
MMSC AS is known the conversation request in the PS territory that need not to wait for Access Network A or Access Network B according to described handoff scenario information, after the setup requests that receives through ICS node and S-CSCF the CS territory of transmitting, be used for voice are switched to Access Network B, by S-CSCF to UE-B initiation session update request.
In addition, described handoff scenario information shows that described switching is the CS territory that voice is switched to Access Network B, is retained in other multimedia groupware in the PS territory of Access Network A;
MMSC AS knows that according to described handoff scenario information needs wait for that UE-A is in the PS territory of Access Network A SIP conversation request that initiate, that be used to upgrade Multimedia session S after the setup requests that receives through ICS node and S-CSCF the CS territory of transmitting, be used for voice are switched to Access Network B;
After the SIP conversation request of initiating in the PS territory that receives described Access Network A, by S-CSCF to UE-B initiation session update request.
In addition, described handoff scenario information shows that described switching is the CS territory that voice is switched to Access Network B, switches to other multimedia groupware the PS territory of Access Network B from the PS territory of Access Network A;
MMSC AS after the setup requests that receives through ICS node and S-CSCF the CS territory of transmitting, be used for voice are switched to Access Network B, according to described handoff scenario information know needs wait for that initiate in the PS territory of Access Network B, be used to set up the SIP conversation request of session;
After the SIP conversation request of initiating in the PS territory that receives described Access Network B, by S-CSCF to UE-B initiation session update request.
In addition, described MMSC AS sends acknowledge message to UE-A after receiving described switch indicating information;
Described UE-A initiates the described SIP conversation request that is used to upgrade Multimedia session S in the PS territory of Access Network A after receiving above-mentioned acknowledge message.
In addition, described MMSC AS sends acknowledge message to UE-A after receiving described switch indicating information;
Described UE-A initiates the described SIP conversation request that is used to set up session in the PS territory of Access Network B after receiving above-mentioned acknowledge message.
In addition, UE-A is the MMSC contracted user, also is the ICS contracted user simultaneously.
In addition, described switch indicating information is a Message message, and the session identification of this message uses the session identification of Multimedia session S, or comprises the session identification of Multimedia session S in the message body of this message.
Whether in sum, adopt method of the present invention, MMSC AS is formerly received under the situation of handoff request in CS territory, knowing needs to wait for and the SIP conversation request of switching relevant PS territory, has saved multimedia conversation continuity and has switched the required time.
Description of drawings
Fig. 1 is that IMS multimedia conversation continuity of the prior art switches the method flow diagram of (all handoff scenario);
The implementation method flow chart of Fig. 2 first embodiment of the invention;
The implementation method flow chart of Fig. 3 second embodiment of the invention;
The implementation method flow chart of Fig. 4 third embodiment of the invention.
Embodiment
Core concept of the present invention is, carrying out before multimedia conversation continuity switches, and the concrete handoff scenario of MMSC user terminal notice MMSC AS makes MMSC AS knows how to carry out subsequent treatment when formerly receiving the handoff request in CS territory.
It should be noted that the user terminal of mentioning in following examples that switches (UE-A) is the MMSC contracted user, also is the ICS contracted user simultaneously.
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
The implementation method flow chart of Fig. 2 first embodiment of the invention.The handoff scenario of this embodiment correspondence is: UE-A and remote subscriber terminal (UE-B) have been set up Multimedia session A on the PS territory (PS1 territory) of Access Network A; For a certain reason, UE-A need switch, and voice are switched to the CS territory of Access Network B, all the other medium deletions; This method specifically may further comprise the steps:
201) the UE-A decision switches to the CS territory with voice, all the other multimedia groupware deletions;
202) UE-A sends switch indicating information in the PS1 territory to MMSC AS, comprises the Multimedia session handover information in this message;
Above-mentioned switch indicating information is Message (message) message of Session Initiation Protocol, the session identification of this message can use the sign of Multimedia session A, perhaps in message body, carry the sign of Multimedia session A, make MMSC AS know the session of this switch indicating information correspondence.
203) after MMSC AS receives above-mentioned switch indicating information, to UE-A loopback 200 OK response messages;
204) after UE-A receives 200 OK message, the request of setting up that makes a call in the CS territory, the called number of this request uses VDN, and this request is addressed to the ICS node;
Above-mentioned VDN can be static configuration in user terminal UE-A, also can be dynamically to obtain in registration process or in the session in the past.
205) receive above-mentioned setup requests after, the ICS node is initiated the SIP call request, the called number of this request is VDN, this message is addressed to the S-CSCF of the home network of UE-A;
206) S-CSCF transmits above-mentioned SIP conversation request according to iFC to MMSC AS;
207) after MMSC AS receives above-mentioned SIP conversation request, the Multimedia session handover information of receiving according to step 202 knows that the concrete scene of switching (promptly only switches voice, all the other medium deletions), therefore send the session updates request to UE-B, this request at first sends to S-CSCF;
208) the S-CSCF above-mentioned session updates request that will receive is transmitted to UE-B;
The session updates request that sends in the step 207 and 208 can be SIP conversation request (a Re-INVITE message), also can be SIP update request (UPDATE message).
209) UE-B sends 200 OK response messages, and this message arrives S-CSCF;
210) S-CSCF gives MMSC AS with 200 OK forwards;
211) MMSC AS and UE-A finish the foundation in the session of CS territory;
212) because the Multimedia session handover information of receiving in step 202 shows the CS territory that only needs voice are switched to Access Network B, therefore after switching was finished, MMSC AS was by sending deletion of Bye message and the Multimedia session A of UE-A in the PS1 territory;
213) UE-A sends the deletion of the session A in 200 OK message authentication PS1 territories to MMSC AS.
The implementation method flow chart of Fig. 3 second embodiment of the invention.The handoff scenario of this embodiment correspondence is: UE-A and remote subscriber terminal (UE-B) have been set up Multimedia session A on the PS territory (PS1 territory) of Access Network A; For a certain reason, UE-A need switch, and voice are switched to the CS territory of Access Network B, and all the other medium are retained in original PS1 territory; This method specifically may further comprise the steps:
301) the UE-A decision switches to the CS territory with voice, and all the other multimedia groupwares are retained in the PS1 territory;
302) UE-A sends switch indicating information in the PS1 territory to MMSC AS, comprises the Multimedia session handover information in this message;
Above-mentioned switch indicating information is Message (message) message of Session Initiation Protocol, the session identification of this message can use the sign of Multimedia session A, perhaps in message body, carry the sign of Multimedia session A, make MMSC AS know the session of this switch indicating information correspondence.
303) after MMSC AS receives above-mentioned switch indicating information, to UE-A loopback 200 OK response messages;
304) after UE-A receives 200 OK message, the request of setting up that makes a call in the CS territory, the called number of this request uses VDN, and this request is addressed to the ICS node;
Above-mentioned VDN can be static configuration in user terminal UE-A, also can be dynamically to obtain in registration process or in the session in the past.
305) receive above-mentioned setup requests after, the ICS node is initiated the SIP call request, the called number of this request is VDN, this message is addressed to S-CSCF;
306) S-CSCF transmits above-mentioned SIP conversation request according to iFC to MMSC AS; The Multimedia session handover information that MMSC AS receives according to step 302 is known the concrete scene (be about to voice and switch to the CS territory, all the other medium are retained in the PS1 territory) of switching, therefore waits for the more SIP conversation request of new session A that is used for of PS1 territory initiation;
307) UE-A initiates SIP conversation request (Re-INVITE message, or UPDATE message) in the PS1 territory after receiving 200 OK message of step 303, wherein can comprise the multimedia handover information, and this message is sent to the S-CSCF of the home network of UE-A;
Above-mentioned steps 304 and step 307 are concurrent execution.
308) after S-CSCF receives above-mentioned request, this request is transmitted to MMSC AS according to iFC;
309) MMSC AS sends the session updates request to UE-B after receiving the SIP conversation request of step 306 and step 308, and this request at first sends to S-CSCF;
310) the S-CSCF above-mentioned session updates request that will receive is transmitted to UE-B;
The session updates request that sends in the step 309 and 310 can be SIP conversation request (a Re-INVITE message), also can be SIP update request (UPDATE message).
311) UE-B sends 200 OK response messages, and this message arrives S-CSCF;
312) S-CSCF gives MMSC AS with 200 OK forwards;
313) MMSC AS and UE-A finish the foundation in the session of CS territory;
314) MMSC AS and UE-A finish the renewal of Multimedia session A.
The implementation method flow chart of Fig. 4 third embodiment of the invention.The handoff scenario of this embodiment correspondence is: UE-A and remote subscriber terminal (UE-B) have been set up Multimedia session A on the PS territory (PS1 territory) of Access Network A; For a certain reason, UE-A need switch, and voice are switched to the CS territory, and all the other medium switch to the PS2 territory; This method specifically may further comprise the steps::
401) the UE-A decision switches to the CS territory with voice, and all the other multimedia groupwares switch to the PS2 territory;
402) UE-A sends switch indicating information in the PS1 territory to MMSC AS, comprises the Multimedia session handover information in this message;
Above-mentioned switch indicating information is Message (message) message of Session Initiation Protocol, the session identification of this message can use the sign of Multimedia session A, perhaps in message body, carry the sign of Multimedia session A, make MMSC AS know the session of this switch indicating information correspondence.
403) after MMSC AS receives above-mentioned switch indicating information, to UE-A loopback 200 OK response messages;
404) after UE-A receives 200 OK message, the request of setting up that makes a call in the CS territory, the called number of this request uses VDN, and this request is addressed to the ICS node;
Above-mentioned VDN can be static configuration in user terminal UE-A, also can be dynamically to obtain in registration process or in the session in the past.
405) receive above-mentioned setup requests after, the ICS node is initiated the SIP call request, the called number of this request is VDN, this message is addressed to S-CSCF;
406) S-CSCF transmits above-mentioned SIP conversation request according to iFC to MMSC AS; The Multimedia session handover information that MMSC AS receives according to step 402 is known the concrete scene (be about to voice and switch to the CS territory, all the other medium switch to the PS2 territory) of switching, therefore waits for the handoff request that initiate in the PS2 territory;
407) UE-A initiates the SIP conversation request in the PS2 territory after receiving 200 OK message of step 403, and the called number of this request is VDI, and can comprise the multimedia handover information in this request, and this request is sent to the S-CSCF of the home network of UE-A;
Above-mentioned VDI can be static configuration in UE-A, also can be dynamically to obtain in registration process or in the session in the past.
Step 404 and step 407 are concurrent execution.
408) after S-CSCF receives above-mentioned request, this request is transmitted to MMSC AS according to iFC;
409) MMSC AS merges this two conversation request after receiving the SIP conversation request of step 406 and step 408, and sends the session updates request to UE-B, and this request at first sends to S-CSCF;
410) the S-CSCF above-mentioned session updates request that will receive is transmitted to UE-B;
The session updates request that sends in the step 409 and 410 can be SIP conversation request (a Re-INVITE message), also can be SIP update request (UPDATE message).
411) UE-B sends 200 OK response messages, and this message arrives S-CSCF;
412) S-CSCF gives MMSC AS with 200 OK forwards;
413) MMSC AS and UE-A finish the foundation in the session of CS territory;
414) MMSC AS and UE-A finish the foundation in the session of PS2 territory;
415) because the Multimedia session handover information of receiving in step 402 shows that this switching is that voice are switched to the CS territory, all the other multimedia groupwares switch to the PS2 territory, therefore after switching was finished, MMSCAS was by sending deletion of Bye message and the Multimedia session A of UE-A in the PS1 territory;
416) UE-A sends the deletion of 200 OK message authentication session A to MMSC AS.
Claims (9)
1, a kind of switching method for multimedia session continuity is characterized in that,
User terminal UE-A has set up Multimedia session S at Access Network A and user terminal UE-B; Before the switching of initiating multimedia conversation continuity, UE-A sends switch indicating information to MMSC AS; MMSC AS is known the handoff scenario information that described multimedia conversation continuity switches according to the Multimedia session handover information that comprises in this message, and after carrying out setup requests that voice switch in being used to of receiving that UE-A initiates, carry out the subsequent treatment that multimedia conversation continuity switches according to different handoff scenario;
The switching of described multimedia conversation continuity switches to voice in the CS territory of Access Network B.
2, the method for claim 1 is characterized in that,
Described MMSC AS sends acknowledge message to UE-A after receiving described switch indicating information;
After UE-A receives this acknowledge message, initiate to be used to carry out the setup requests that described voice switch in the CS territory of Access Network B; The called number of this setup requests is VDN.
3, the method for claim 1 is characterized in that,
Described handoff scenario information shows that described switching is the CS territory that voice is switched to Access Network B, with the PS territory deletion of other multimedia groupware from Access Network A;
MMSC AS is known the conversation request in the PS territory that need not to wait for Access Network A or Access Network B according to described handoff scenario information, after the setup requests that receives through ICS node and S-CSCF the CS territory of transmitting, be used for voice are switched to Access Network B, by S-CSCF to UE-B initiation session update request.
4, the method for claim 1 is characterized in that,
Described handoff scenario information shows that described switching is the CS territory that voice is switched to Access Network B, is retained in other multimedia groupware in the PS territory of Access Network A;
MMSC AS knows that according to described handoff scenario information needs wait for that UE-A is in the PS territory of Access Network A SIP conversation request that initiate, that be used to upgrade Multimedia session S after the setup requests that receives through ICS node and S-CSCF the CS territory of transmitting, be used for voice are switched to Access Network B;
After the SIP conversation request of initiating in the PS territory that receives described Access Network A, by S-CSCF to UE-B initiation session update request.
5, the method for claim 1 is characterized in that,
Described handoff scenario information shows that described switching is the CS territory that voice is switched to Access Network B, switches to other multimedia groupware the PS territory of Access Network B from the PS territory of Access Network A;
MMSC AS after the setup requests that receives through ICS node and S-CSCF the CS territory of transmitting, be used for voice are switched to Access Network B, according to described handoff scenario information know needs wait for that initiate in the PS territory of Access Network B, be used to set up the SIP conversation request of session;
After the SIP conversation request of initiating in the PS territory that receives described Access Network B, by S-CSCF to UE-B initiation session update request.
6, method as claimed in claim 4 is characterized in that,
Described MMSC AS sends acknowledge message to UE-A after receiving described switch indicating information;
Described UE-A initiates the described SIP conversation request that is used to upgrade Multimedia session S in the PS territory of Access Network A after receiving above-mentioned acknowledge message.
7, method as claimed in claim 5 is characterized in that,
Described MMSC AS sends acknowledge message to UE-A after receiving described switch indicating information;
Described UE-A initiates the described SIP conversation request that is used to set up session in the PS territory of Access Network B after receiving above-mentioned acknowledge message.
8, method as claimed in claim 1 or 2 is characterized in that, UE-A is the MMSC contracted user, also is the ICS contracted user simultaneously.
9, the method for claim 1 is characterized in that, described switch indicating information is a Message message, and the session identification of this message uses the session identification of Multimedia session S, or comprises the session identification of Multimedia session S in the message body of this message.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2011057568A1 (en) * | 2009-11-11 | 2011-05-19 | 中兴通讯股份有限公司 | Method and system for realizing session handover |
| CN102624759A (en) * | 2011-01-28 | 2012-08-01 | 中兴通讯股份有限公司 | Method for realizing data migration in session and node |
| CN101848194B (en) * | 2009-03-23 | 2013-01-02 | 华为技术有限公司 | Method, system, server and user equipment for transferring media |
| CN103797852A (en) * | 2011-09-16 | 2014-05-14 | 日本电气株式会社 | Communication system |
| CN108206898A (en) * | 2016-12-20 | 2018-06-26 | 展讯通信（上海）有限公司 | Realize the method, apparatus of multi-party call and mostly logical terminal |
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| CN101370176B (en) * | 2007-08-17 | 2011-12-21 | 华为技术有限公司 | Method and device for transferring multimedia conversation between different access networks |
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| CN101848194B (en) * | 2009-03-23 | 2013-01-02 | 华为技术有限公司 | Method, system, server and user equipment for transferring media |
| WO2011057568A1 (en) * | 2009-11-11 | 2011-05-19 | 中兴通讯股份有限公司 | Method and system for realizing session handover |
| US8509781B2 (en) | 2009-11-11 | 2013-08-13 | Zte Corporation | Method and system for realizing session handover |
| CN102624759A (en) * | 2011-01-28 | 2012-08-01 | 中兴通讯股份有限公司 | Method for realizing data migration in session and node |
| CN103797852A (en) * | 2011-09-16 | 2014-05-14 | 日本电气株式会社 | Communication system |
| US9900818B2 (en) | 2011-09-16 | 2018-02-20 | Nec Corporation | Communication system |
| CN108206898A (en) * | 2016-12-20 | 2018-06-26 | 展讯通信（上海）有限公司 | Realize the method, apparatus of multi-party call and mostly logical terminal |
| CN108206898B (en) * | 2016-12-20 | 2021-03-19 | 展讯通信（上海）有限公司 | Method and device for realizing multi-party call and multi-pass terminal |
| CN109189542A (en) * | 2018-09-28 | 2019-01-11 | 成都安恒信息技术有限公司 | A kind of remote desktop access method for O&M auditing system |
| CN109189542B (en) * | 2018-09-28 | 2021-10-15 | 成都安恒信息技术有限公司 | Remote desktop access method for operation and maintenance auditing system |
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