CN101808136B - Method, device and system for realizing synchronization of user dynamic resources - Google Patents
Method, device and system for realizing synchronization of user dynamic resources Download PDFInfo
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- CN101808136B CN101808136B CN201010135451.8A CN201010135451A CN101808136B CN 101808136 B CN101808136 B CN 101808136B CN 201010135451 A CN201010135451 A CN 201010135451A CN 101808136 B CN101808136 B CN 101808136B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/10—Architectures or entities
- H04L65/102—Gateways
- H04L65/1043—Gateway controllers, e.g. media gateway control protocol [MGCP] controllers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/40—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection
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Abstract
The invention discloses a method, a device and a system for realizing synchronization of user dynamic resources. The method comprises that after a media gateway carries out disaster tolerance registration to a media gateway controller and enters a service in case of the disaster tolerance, the media gateway reports the state of the user resources which are being occupied to the media gateway controller based on an H.248 protocol; and if the user resources have been released, the media gateway controller eliminates the stored state information of the corresponding user. When the disaster tolerance occurs to the media gateway, the invention can make the media gateway controller know which user resources are being occupied in the media gateway in time so as to correctly acquire the information of the dynamic user resources, and cannot occupy the occupied resources when selecting the called resources in the subsequent new call so as to guarantee that when the disaster tolerance occurs to the media gateway, the dynamic user resource can correctly realize uninterrupted management in the media gateway controller until the dynamic user resources completely recovers to be at idle condition.
Description
Technical field
The present invention relates to NGN (Next Generation Network, next generation network) network technical field, particularly relate to and a kind ofly realize the synchronous method of user dynamic resources, Apparatus and system.
Background technology
In next generation network, by traditional switch being separated into MGC (Media Gateway Control, Media Gateway Controller) and MG (Media Gateway, media gateway), utilize IP (Internet Protocol, Internet protocol)/ATM (Asynchronous Transfer Mode, asynchronous transfer mode) feature of network, can realize on the one hand voice, image, data mutual, MGC manyly more easily can introduce business on the other hand.MGC also can by MG and traditional PSTN (Public Switched TelephoneNetwork, PSTN), PLMN (Public Land Mobile-communicationNetwork, public land mobile communication network) network interworking.
H.248 agreement is as the main medium gateway protocol between MGC and MG, mainly completes: 1) under MGC controls, complete foundation and the release of the media channel in MG; 2) under MGC controls, complete the media channel in MG and be connected with dismounting with the connection of bearer path; 3) under MGC controls, the configuration of the attribute to media channel and bearer path in MG is completed; 4) in MG, complete the operation of MGC to media channel and bearer path, comprise playback, audit etc.; 5) event in MG is reported MGC; 6) some simple call signalings are realized, as analog line signaling, channel associated signalling etc.Can find out, H.248 agreement is a kind of control protocol up and down, relates to the behavior of MGC control MG completely.
In next generation network, switch connection diagram as shown in Figure 1, and the MGC belonging to MG1 comprises MGC1 and MGC2 on right side, is configured with a MGC status list, comprises the state of MGC1 and MGC2, but only belong to MGC1 at synchronization MG1 in MG1.And when MG1 and its MGC1 link occur to interrupt, MG1 then finds next MGC, the MGC2 namely in MGC status list, and cut-in operation.And each MGC is when managing MG, all needs to be grasped the user dynamic resources such as some call busy-idle conditions, the operation flows such as calling can be controlled.The user dynamic resources of MGC management, as: the state that user is current, a lot of control informations etc.Once there is disaster tolerance action, the way of routine is as shown in Figure 2 at present:
Step S1: when disaster tolerance occurs MG1, MG1 initiate disaster tolerance registration to MGC2 and enter service.
Step S2:MGC2 accepts registration, replys response to MG1.
All related resources of MG1 are set to initial condition by step S3:MGC2.
As above scheme certainly exists such problem, much before disaster tolerance occurs, the business that MGC1 produces cannot continue on MGC2, such as: the business such as the ongoing calling of user, call, fax, can only be forced to when all related resources of MGC2 to MG1 carry out initialization interrupt, affect very much Consumer's Experience and impression.In addition, because the user dynamic resources produced on MGC1 exists usually, data volume is large, the feature of dynamic change, be difficult to accomplish that MGC2 is to the user dynamic resources data real time backup before on MG1, thus MGC2 when there is disaster tolerance action, cannot carry out an effectively management to the user dynamic resources of this MG1.
Summary of the invention
The technical problem to be solved in the present invention is, provides a kind of and realizes the synchronous method of user dynamic resources, Apparatus and system, enables Media Gateway Controller know the user dynamic resources of the media gateway that disaster tolerance occurs in time, thus carries out control and management to it.
The technical solution used in the present invention is, describedly realizes the synchronous method of user dynamic resources, comprising:
Carry out after disaster tolerance logs in and enter service to Media Gateway Controller during media gateway generation disaster tolerance, described media gateway reports the user resources state taken to described Media Gateway Controller;
When the user resources taken are released, described media gateway reports d/d user resources state to described Media Gateway Controller.
Described media gateway comprises further after described Media Gateway Controller reports the user resources state taken:
Described Media Gateway Controller arranges according to the described user resources state taken and preserves the state information of the user taken.
Described media gateway reports the user resources state taken specifically to refer to described Media Gateway Controller: the user resources state taken described in described media gateway to be reported to described Media Gateway Controller by the parameter value in the method signaling parameter of the H.248 servicechange request message of agreement and reason signaling parameter;
Or, the user resources state taken described in described media gateway to be reported to described Media Gateway Controller by the parameter value in the expansion x signaling parameter of the H.248 servicechange request message of agreement.
Described Media Gateway Controller arranges according to the described user resources state taken and after preserving the state information of the user taken, comprises further:
The Current resource seizure condition of described user is audited in described Media Gateway Controller timing, upgrades the state information of described user with this.
The Current resource seizure condition that described user is audited in described Media Gateway Controller timing specifically refers to:
Described Media Gateway Controller regularly sends the AuditValue demand signalling of the described user's Current resource seizure condition of examination & verification to described media gateway;
Described media gateway replys AuditValue response signaling, by the Current resource seizure condition of user described in the subsidiary reporting parameters of AuditValue response signaling.
When the user resources taken are released, described media gateway is to after described Media Gateway Controller reports d/d user resources state, and the method comprises further: described Media Gateway Controller removes the state information of described user.
The present invention also provides a kind of and realizes the synchronous device of user dynamic resources, comprises following part:
Media gateway, after disaster tolerance logs in and enter service, reports the user resources state taken for carrying out to Media Gateway Controller when there is disaster tolerance to described Media Gateway Controller;
Media Gateway Controller, for arranging according to the described user resources state taken and preserve the state information of the user taken, when described user resources are released, removes the state information of the respective user of preserving.
Described media gateway is further used for:
The user resources state taken described in being reported to described Media Gateway Controller by the parameter value in the method signaling parameter of the H.248 servicechange request message of agreement and reason signaling parameter,
Or, the user resources state taken described in being reported to described Media Gateway Controller by the parameter value in the expansion x signaling parameter of the H.248 servicechange request message of agreement.
Described Media Gateway Controller is further used for:
The Current resource seizure condition of user described in periodic auditing.
The present invention also provides a kind of and realizes the synchronous system of user dynamic resources, and media gateway is connected with Media Gateway Controller by IP network, and is subject to the management of affiliated Media Gateway Controller, is connected with user below media gateway, wherein:
Media gateway, after disaster tolerance logs in and enter service, reports the user resources state taken for carrying out to Media Gateway Controller when there is disaster tolerance to described Media Gateway Controller;
Media Gateway Controller, for arranging according to the described user resources state taken and preserve the state information of the user taken, when described user resources are released, removes the state information of the respective user of preserving.
Adopt technique scheme, the present invention at least has following advantages:
Of the present inventionly realize the synchronous method of user dynamic resources, Apparatus and system, carry out after disaster tolerance logs in and enter service to Media Gateway Controller during media gateway generation disaster tolerance, media gateway reports based on H.248 agreement the user resources state taken to Media Gateway Controller, further, the Current resource that described user is audited in Media Gateway Controller timing takies situation, if described user resources are still occupied, then continue timing examination & verification, if described user resources are released, then Media Gateway Controller removes the state information of the respective user of preserving.When media gateway generation disaster tolerance, which user resources that the present invention can make Media Gateway Controller grasp in time under media gateway take, thus correctly can obtain the information of these dynamic subscriber's resources, and select no longer to take these occupied resources during called resource in follow-up new calling.Thus when can ensure media gateway generation disaster tolerance, dynamic subscriber's resource can correctly realize uninterruptedly managing until it recovers idle condition completely in Media Gateway Controller.The problem of dynamic resource management during what the present invention was efficient, feasible solve media gateway disaster tolerance, all feasible to all types of media gateway user.
Accompanying drawing explanation
Fig. 1 is switch connection diagram in next generation network in prior art;
Fig. 2 is the disaster tolerance process of media gateway and Media Gateway Controller in prior art;
Fig. 3 is for realizing the synchronous method flow diagram of user dynamic resources described in first embodiment of the invention;
Fig. 4 is for realizing the synchronous method flow diagram of user dynamic resources described in second embodiment of the invention;
Fig. 5 is for realizing the synchronous method flow diagram of user dynamic resources described in third embodiment of the invention;
Fig. 6 is for realizing the synchronous system composition schematic diagram of user dynamic resources described in sixth embodiment of the invention.
Embodiment
For further setting forth the present invention for the technological means reaching predetermined object and take and effect, below in conjunction with accompanying drawing and preferred embodiment, what propose the present invention describedly realizes the synchronous method of user dynamic resources, Apparatus and system, is described in detail as follows.
First embodiment of the invention, in a networking example of next generation network as shown in Figure 1, supposes that user resources on MG1 are control by MGC1 management originally, describedly realizes the synchronous method of user dynamic resources, as shown in Figure 3, comprises following concrete steps:
, there is disaster tolerance in step S101, MG1 initiates disaster tolerance registration request to MGC2.
Step S102, MGC2 accept registration, reply disaster tolerance registration response, make MG1 enter service simultaneously to MG1.It should be noted that, step S101-S102 be in this area when there is disaster tolerance action in MG known processing procedure, wherein relating to the mode that MG1 chooses MGC2 is prior art, so place is not described in detail.
Step S103, MG1 scans the state of current user, detect the user be in call, then servicechange demand signalling is sent to MGC2, method signaling parameter and the reason signaling parameter of choosing servicechange demand signalling report the user resources state taken as the specific signaling parameter consulted between media gateway and Media Gateway Controller, such as: set method signaling parameter values as FAILOVER, reason signaling parameter values is 990, represents these user resources just occupied.The action that MG1 scans current User Status belongs to the function that media gateway in prior art inherently has, so place is not described in detail.
Step S104, MGC2 arrange according to the user resources state taken and preserve the state of respective user for calling seizure condition, send servicechange response signaling, represent the servicechange demand signalling accepting MG1 and report to MG1.
Step S105, when respective user on-hook, MG1 reports on-hook signaling to MGC2, represents that user resources state discharges.
Step S106, MGC2 reply on-hook response signaling, represent the on-hook signaling accepting MG1 and report, and remove the respective user calling seizure condition that it is preserved simultaneously.
Second embodiment of the invention, in a networking example of next generation network as shown in Figure 1, suppose that the user resources on MG1 are control by MGC1 management originally, the described difference realizing the synchronous method of user dynamic resources and the first embodiment is just that step S203 sends the incidental parameter of servicechange demand signalling, as shown in Figure 4, following concrete steps are comprised:
, there is disaster tolerance in step S201, MG1 initiates disaster tolerance registration request to MGC2.
Step S202, MGC2 accept registration, reply disaster tolerance registration response, make MG1 enter service simultaneously to MG1.It should be noted that, step S101-S102 be in this area when there is disaster tolerance action in MG known processing procedure, wherein relating to the mode that MG1 chooses MGC2 is prior art, so place is not described in detail.
Step S203, MG1 scans the state of current user, detect the user be in call, then servicechange demand signalling is sent to MGC2, the expansion x signaling parameter of servicechange demand signalling is adopted to report the user resources state taken as the specific signaling parameter consulted between media gateway and Media Gateway Controller, such as: set x-seize signaling parameter values as 100, these user resources are represented just occupied.In the prior art, media gateway can grasp the state of user below in real time, and the action that MG1 scans current User Status belongs to the function that media gateway in prior art inherently has, so place is not described in detail.
Step S204, MGC2 arrange according to the user resources state taken and preserve the state of respective user for calling seizure condition, send servicechange response signaling, represent the servicechange demand signalling accepting MG1 and report to MG1.
Step S205, when respective user on-hook, MG1 reports on-hook signaling to MGC2, represents that user resources state discharges.
Step S206, MGC2 reply on-hook response signaling, represent the on-hook signaling accepting MG1 and report, and remove the respective user calling seizure condition that it is preserved simultaneously.
Third embodiment of the invention, a kind ofly realizes the synchronous method of user dynamic resources, as shown in Figure 5, comprises following concrete steps:
, there is disaster tolerance in step S301, MG1 initiates disaster tolerance registration request to MGC2.
Step S302, MGC2 accept registration, reply disaster tolerance registration response, make MG1 enter service simultaneously to MG1.It should be noted that, step S101-S102 be in this area when there is disaster tolerance action in MG known processing procedure, wherein relating to the mode that MG1 chooses MGC2 is prior art, so place is not described in detail.
Step S303, MG1 scans the state of current user, detect the user be in call, then servicechange demand signalling is sent to MGC2, the expansion x signaling parameter of servicechange demand signalling is adopted to report the user resources state taken as the specific signaling parameter consulted between media gateway and Media Gateway Controller, such as: set x-seize signaling parameter values as 100, these user resources are represented just occupied.
Step S304, MGC2 arrange according to the user resources state taken and preserve the state information of respective user, send servicechange response signaling to MG1.
Step S305, when respective user on-hook, MG1 reports on-hook signaling to MGC2, carries the user resources state information of release.
Step S306, MGC2 reply on-hook response signaling, represent the on-hook signaling accepting MG1 and report, and remove the respective user calling seizure condition that it is preserved simultaneously.
For preventing the MG1 in step S305 from reporting on-hook signaling unsuccessful to MGC2, the present embodiment performs following steps while execution step 305:
Step 307, the AuditValue that MGC2 sends examination & verification respective user resource status to MG1 at set intervals audits signaling, the preferred time interval is 4 seconds, if interval time is too short, when user under media gateway is numerous, network bandwidth resources will be taken by examination & verification signaling frequently, if interval time is oversize, Media Gateway Controller can be made again can not to grasp the occupation condition of user under media gateway in time, affect the connection management to user resources and control, therefore, according to the empirical value of call duration statistics, the time interval sending examination signaling is set to 4 seconds the bests.
Step S308, MG1 reply AuditValue and audit response signaling, the state that report of user is current.Concrete state report the state that can be represented active user by the AuditValue event descriptor eventsDescriptor audited in the examination & verification return parameters auditReturnParameter parameter of carrying in response signaling, such as: if represent current in event descriptor to be in detection on-hook, then illustrate in call, and if detect off-hook, then illustrate that its state discharges.
Step S309, the AuditValue that MGC2 replys according to MG1 audits response signaling, whether unanimously with the User Status of preserving detect current user state, if User Status is consistent, then whether the calling Media Stream detected further between this end subscriber and peer user also exists, and prevents omitting opposite end calling and has discharged the local terminal user resources release caused, if, then repeat step S307 to S309, otherwise remove the respective user state of preserving, remove timing examination & verification signaling timer simultaneously; If User Status is inconsistent, then remove the respective user state of preservation, remove timing examination & verification signaling timer simultaneously.
Fourth embodiment of the invention, a kind ofly realizes the synchronous device of user dynamic resources, comprises following part:
Media gateway, for to carry out after disaster tolerance logs in and enter service to Media Gateway Controller when there is disaster tolerance, the user resources state taken is reported to Media Gateway Controller based on H.248 agreement, concrete, described media gateway reports the user resources state taken to Media Gateway Controller by servicechange demand signalling, described servicechange request message represents the user resources state taken by the parameter value in subsidiary method signaling parameter and reason signaling parameter.
Media Gateway Controller, for arranging according to the user resources state taken and preserve the state information of respective user, when user resources are released, removes the state information of the respective user of preserving.
Fifth embodiment of the invention, a kind ofly realizes the synchronous device of user dynamic resources, comprises following part:
Media gateway, for to carry out after disaster tolerance logs in and enter service to Media Gateway Controller when there is disaster tolerance, the user resources state taken is reported to Media Gateway Controller based on H.248 agreement, concrete, described media gateway reports the user resources state taken to Media Gateway Controller by servicechange demand signalling, described servicechange request message represents by the parameter value in subsidiary expansion x signaling parameter the user resources state taken.
Media Gateway Controller, for arranging according to the user resources state taken and preserve the state information of respective user, described in periodic auditing, the Current resource of user takies situation, if described user resources are still occupied, then continue timing examination & verification, if described user resources are released, then Media Gateway Controller removes the state information of the respective user of preserving.
Sixth embodiment of the invention, a kind ofly realizes the synchronous system of user dynamic resources, and as shown in Figure 6, media gateway is connected with Media Gateway Controller by IP network, and by the management of affiliated Media Gateway Controller, is connected with user below media gateway, wherein:
Media gateway, for to carry out after disaster tolerance logs in and enter service to Media Gateway Controller when there is disaster tolerance, the user resources state taken is reported to Media Gateway Controller based on H.248 agreement, concrete, reported the user resources state taken to Media Gateway Controller by servicechange demand signalling, described servicechange request message represents by the parameter value in subsidiary expansion x signaling parameter the user resources state taken; When respective user releasing resource, media gateway reports the user resources state of release to Media Gateway Controller.
Media Gateway Controller, for arranging according to the user resources state taken and preserve the state information of respective user, the Current resource that described user is audited in timing takies situation, if described user resources are still occupied, then continue timing examination & verification, if described user resources are released, then Media Gateway Controller removes the state information of the respective user of preserving.
Adopt the method for media gateway generation disaster tolerance dynamic resource management in H.248 agreement of the present invention, after media gateway generation disaster tolerance, without the need to initialization resource status, the state taking resource is reported by signaling specific in H.248 agreement, the state of respective user is set up by Media Gateway Controller, these resource statuss can be maintained like this, avoid again selecting next time to select these occupied resources during resource simultaneously.Further, for avoiding these resource exceptions, being in false seizure condition always, can regularly issuing examination & verification signaling, auditing the state of these resources, if state has change, then remove these states at once.Thus provide a kind of mechanism, achieve the management function of media gateway disaster tolerance dynamic resource efficiently and accurately.
By the explanation of embodiment, should to the present invention for the technological means reaching predetermined object and take and effect be able to more deeply and concrete understanding, but appended diagram be only to provide with reference to and the use of explanation, be not used for being limited the present invention.
Claims (6)
1. realize the method that user dynamic resources is synchronous, it is characterized in that, comprising:
Carry out after disaster tolerance logs in and enter service to Media Gateway Controller during media gateway generation disaster tolerance, described media gateway reports the user resources state taken to described Media Gateway Controller;
When the user resources taken are released, described media gateway reports d/d user resources state to described Media Gateway Controller;
Described Media Gateway Controller arranges according to the described user resources state taken and preserves the state information of the user taken;
The current resource status of described user is audited in described Media Gateway Controller timing, upgrade described state information with this, the current resource status that described user is audited in described Media Gateway Controller timing specifically refers to: described Media Gateway Controller regularly sends the AuditValue demand signalling of the described user's current resource status of examination & verification to described media gateway; Described media gateway replys AuditValue response signaling, is reported the current resource status of described user by the event descriptor eventsDescriptor in the examination & verification return parameters auditReturnParameter parameter of carrying in AuditValue response signaling.
2. realize the synchronous method of user dynamic resources according to claim 1, it is characterized in that, described media gateway reports the user resources state taken specifically to refer to described Media Gateway Controller: the user resources state taken described in described media gateway to be reported to described Media Gateway Controller by the parameter value in the method signaling parameter of the H.248 servicechange request message of agreement and reason signaling parameter;
Or, the user resources state taken described in described media gateway to be reported to described Media Gateway Controller by the parameter value in the expansion x signaling parameter of the H.248 servicechange request message of agreement.
3. realize the synchronous method of user dynamic resources according to claim 1, it is characterized in that, when the user resources taken are released, described media gateway, to after described Media Gateway Controller reports d/d user resources state, comprises: described Media Gateway Controller removes the state information of described user further.
4. realize the device that user dynamic resources is synchronous, it is characterized in that, comprise following part:
Media gateway, after disaster tolerance logs in and enter service, reports the user resources state taken for carrying out to Media Gateway Controller when there is disaster tolerance to described Media Gateway Controller;
Media Gateway Controller, for arranging according to the described user resources state taken and preserve the state information of the user taken, when described user resources are released, removes the state information of the respective user of preserving;
Described Media Gateway Controller, the current resource status of described user is also audited for timing, upgrade described state information with this, concrete, described Media Gateway Controller regularly sends the AuditValue demand signalling of the described user's current resource status of examination & verification to described media gateway;
Described media gateway, also for replying AuditValue response signaling, reported the current resource status of described user by the event descriptor eventsDescriptor in the examination & verification return parameters auditReturnParameter parameter of carrying in AuditValue response signaling.
5. realize the synchronous device of user dynamic resources according to claim 4, it is characterized in that, described media gateway is further used for:
The user resources state taken described in being reported to described Media Gateway Controller by the parameter value in the method signaling parameter of the H.248 servicechange request message of agreement and reason signaling parameter,
Or, the user resources state taken described in being reported to described Media Gateway Controller by the parameter value in the expansion x signaling parameter of the H.248 servicechange request message of agreement.
6. realize the system that user dynamic resources is synchronous, it is characterized in that, media gateway is connected with Media Gateway Controller by IP network, and is subject to the management of affiliated Media Gateway Controller, is connected with user below media gateway, wherein:
Media gateway, after disaster tolerance logs in and enter service, reports the user resources state taken for carrying out to Media Gateway Controller when there is disaster tolerance to described Media Gateway Controller;
Media Gateway Controller, for arranging according to the described user resources state taken and preserve the state information of the user taken, when described user resources are released, removes the state information of the respective user of preserving;
Described Media Gateway Controller, the current resource status of described user is also audited for timing, upgrade described state information with this, concrete, described Media Gateway Controller regularly sends the AuditValue demand signalling of the described user's current resource status of examination & verification to described media gateway;
Described media gateway, also for replying AuditValue response signaling, reported the current resource status of described user by the event descriptor eventsDescriptor in the examination & verification return parameters auditReturnParameter parameter of carrying in AuditValue response signaling.
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| PCT/CN2011/071898 WO2011120384A1 (en) | 2010-03-30 | 2011-03-17 | Method, device and system for achieving synchronization of user dynamic resources |
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| CN108322918B (en) * | 2017-01-18 | 2021-06-18 | 普天信息技术有限公司 | Resource information checking method |
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| CN101155407A (en) * | 2006-09-29 | 2008-04-02 | 中兴通讯股份有限公司 | Mobile switching centre imitated disaster tolerance recovery method based on visit position register |
| CN101355804A (en) * | 2008-09-01 | 2009-01-28 | 中兴通讯股份有限公司 | System and method for seamless disaster-containing switching next generation network medium gateway |
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| KR20080068989A (en) * | 2007-01-22 | 2008-07-25 | 삼성전자주식회사 | Apparatus and method for controlling media gateway of termination resource in communication system |
| CN101094274A (en) * | 2007-07-16 | 2007-12-26 | 中兴通讯股份有限公司 | Method for realizing disaster tolerated uninterrupted call in media gateway of next generation of network |
| CN101808136B (en) * | 2010-03-30 | 2015-02-25 | 中兴通讯股份有限公司 | Method, device and system for realizing synchronization of user dynamic resources |
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| CN101155407A (en) * | 2006-09-29 | 2008-04-02 | 中兴通讯股份有限公司 | Mobile switching centre imitated disaster tolerance recovery method based on visit position register |
| CN101355804A (en) * | 2008-09-01 | 2009-01-28 | 中兴通讯股份有限公司 | System and method for seamless disaster-containing switching next generation network medium gateway |
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