WO2006108343A1 - Procede pour une passerelle de supports controlant les evenements et les rapportant - Google Patents
Procede pour une passerelle de supports controlant les evenements et les rapportant Download PDFInfo
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- WO2006108343A1 WO2006108343A1 PCT/CN2006/000556 CN2006000556W WO2006108343A1 WO 2006108343 A1 WO2006108343 A1 WO 2006108343A1 CN 2006000556 W CN2006000556 W CN 2006000556W WO 2006108343 A1 WO2006108343 A1 WO 2006108343A1
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- media gateway
- event
- preset
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000004044 response Effects 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 4
- 230000004913 activation Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
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- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/66—Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
- H04L43/0817—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking functioning
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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
- H04L65/1023—Media gateways
- H04L65/103—Media gateways in the network
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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
- H04L65/1033—Signalling gateways
- H04L65/104—Signalling gateways in the network
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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
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/1066—Session management
- H04L65/1101—Session protocols
Definitions
- the present invention relates to a network communication technology, and in particular, to a method for a media gateway to monitor and report an event.
- the Media Gateway Controller MCC: Media Gateway Control
- the Media Gateway MG: Media Gateway
- NTN Next Generation Network
- the MGC is responsible for the call control function
- the MG is responsible for the service bearer function, thereby separating the call control plane and the service bearer plane, thereby fully sharing network resources, simplifying equipment upgrade and service expansion, and greatly reducing development and maintenance costs.
- the media gateway control protocol is the main protocol for communication between the MG and the MGC.
- H. 2 4 8/MeGaCo various resources on the MG are abstractly represented as terminals (Termination).
- the terminal is further divided into a physical terminal and a temporary terminal.
- the former represents some semi-permanent physical entities, such as TDM channels, and the latter represents public resources released after temporary application, such as RTP flows.
- the combination between terminals is abstracted as a context (Context).
- Context can contain multiple terminals, so Topology can be used to describe the interrelationship between terminals.
- connection of the call is actually the operation of the terminal and context. This is done through commands and responses between the MGC and the MG.
- the parameters carried by the command also called descriptors (Descriptor) are divided into categories such as property, signal, event, and statis tic.
- Descriptor descriptors
- the parameters with business relevance are logically aggregated into a package.
- the signal is used by the MGC to instruct the MG to perform operations on the corresponding resources, such as placing a dial tone, ring back tone, busy tone, etc. to the user.
- the event is used by the MGC to instruct the MG to monitor the corresponding status, such as monitoring whether the user is off-hook, hanging up, dialing content, or whether to shoot the fork. Events are generally triggered by a change in state and may result in corresponding response actions, such as placing a dial tone to the user after the user picks up the phone.
- the event must first be sent by the MGC to the MG.
- the MG can then initiate monitoring of the corresponding state changes.
- this mechanism is suitable for the usual situation.
- this mechanism has some drawbacks. For example, after the MG successfully registers with the MGC, it needs to immediately start monitoring the MGC activation status. This can be reported by the MG to report the inactivity timeout (Inact ivi ty Timeout, which means that the MG detects that the silent period of the message from the MGC exceeds the predetermined time). Trigger the MGC reply response to achieve.
- an object of the present invention is to provide a method for a media gateway to monitor and report an event, thereby solving the problem that the media gateway fails to obtain an event sent by the media gateway controller in some special cases.
- the resulting system problems improve the stability of the network system.
- the present invention provides a method for a media gateway to monitor and report an event, including:
- the media gateway monitors the preset events and reports the monitoring results to the media gateway controller.
- the event preset on the media gateway conforms to an agreement between the media gateway controller and the media gateway.
- the agreement of the media gateway controller and the media gateway for the preset event includes the use of the same parameters and the same request identifier.
- the event is an event that the media gateway can monitor.
- the step B further includes: when the media gateway sends the event and related parameters and the request identifier preset on the media gateway to the media gateway during the preset event monitoring by the media gateway, the media gateway The event and related parameters and request identifiers sent by the media gateway controller are monitored.
- the media gateway monitors the event and related parameters and the request identifier sent by the media gateway controller during the life cycle.
- the media gateway monitors the event preset by the media gateway and related parameters and request identifier.
- the media gateway continuously monitors the events and related parameters and request identifiers sent by the media gateway controller.
- the method of preset events on the media gateway includes automatic mode or manual mode.
- Methods for pre-setting events on the media gateway include: Software coded inline or console operations or network management operations.
- the event preset on the media gateway is a timer timeout event.
- the state of the event is automatically monitored after the MG is started, and the monitoring result is reported to the MGC, thus avoiding the MGC failing to issue an event to the MG for various reasons.
- System problems which improve the stability of the system. DRAWINGS
- FIG. 1 is a schematic diagram showing networking of MGC and MG in a next generation network
- FIG. 2 shows a flow chart of the method of the present invention.
- the event is sent by the MGC to the MG.
- an event to be monitored is preset on the MG, so that the MG can monitor the corresponding state according to the event, such as monitoring whether the user picks up the phone, whether to hang up, whether the content is dialed, whether the fork is taken, whether the network is faulty, or the quality. Whether the alarm, timer expires, etc.
- a request identifier (Reques t ID) and parameters that may be needed are required. This kind of issued event is also called a request (Reques ted) event.
- the event is reported to the MGC with the same request identifier as above and the parameters that may be required. This reported event is also called an Observed event. Request events and observation events are associated by the same request identifier. The parameters accompanying the request and observation events may be different.
- the present invention provides a method for an MG to automatically monitor an event and report it to the MGC. The basic idea is to: preset an event to be monitored on the MG; when the MG is running, the MG automatically monitors the preset event and monitors it. The result is reported to the MGC.
- step 1 the user can preset any event on the MG as needed, such as the user picking up the phone, hang up, dialing, flashing, network fault, quality alarm, timer timeout, etc. event.
- step 2 these preset events are started simultaneously while the MG is running.
- step 3 the MG monitors these preset events.
- step 4 the MG reports the result of the monitoring to the MGC.
- step 5 the MG waits for the response of the MGC and processes it according to the response.
- Preset events on the MG should conform to the agreement between the MGC and the MG, such as using the same parameters and the same request identifier. In this way, the MGC will not respond incorrectly to the receipt of an event that is preset on the MG.
- Now use the Inact ivi ty Timeout event this event is used for a timer timeout event
- the MG monitors the MGC state) as an example to specifically illustrate the effects of the present invention.
- the Inact ivi ty Timeout event and its parameter Maximum Inact ivi ty Time value (for example, 30 seconds) and the clearing identifier (for example, 0) are first preset on the MG.
- the Inact ivi ty Timeout event is started, that is, the value of the parameter Maximum Inact ivi ty Time is used as the duration of the timer, and the message from the MGC is started to be monitored.
- the MGC fails, the MG cannot obtain the MGC message to reset the timer.
- the timer expires, the MG will be identified by the preset request.
- the Timeout event is given to the MGC. If the MGC does not respond to the event reported by the MG, the MG initiates an exception handling mechanism, such as re-registering with the backed-up MGC. This eliminates the possibility that the MG will not be able to initiate the event monitoring because the MGC did not issue the event, and it is impossible to know the hidden danger of the system caused by the MGC failure. Preset events on the MG can be automated or manual, such as software code embedding, console operations, network management operations, and so on.
- the relevant parameters and the request identifier carried by the MGC when the event is sent shall be taken as the MGC.
- the event and related parameters and request identifiers are monitored. If the event has a life cycle, the MG monitors the event and related parameters and request identifiers sent by the MGC during the life cycle. Outside the life cycle, the MG identifies the event and related parameters and request identifiers preset by the MG. Monitor. If the event has no life cycle, the monitoring of the event by the MG continues to be based on the event and related parameters and request identifiers issued by the MGC.
- the state of the event is automatically monitored after the MG is started, and the monitoring result is reported to the MGC, thereby preventing the MGC from failing to issue an event to the MG for various reasons.
- the resulting system problems increase the stability of the system. While the invention has been described by the embodiments of the present invention, it will be understood by those skilled in the art The claims are limited.
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Description
一种媒体网关监测并上报事件的方法
技术领域
本发明涉及一种网络通信技术, 尤其涉及一种媒体网关监测并上报 事件的方法。
背景技术
如图 1所示, 媒体网关控制器 ( MGC: Media Gateway Control ler ) 和媒体网关(MG: Media Gateway )是下一代网络 ( NGN: Next Generat ion Network ) 中的两个关键构件。 MGC负责呼叫控制功能, MG负责业务承载 功能, 藉此实现呼叫控制平面和业务承载平面的分离, 从而可充分共享 网络资源, 并简化了设备升级和业务扩展, 大大降低了开发和维护成本。
媒体网关控制协议是 MG和 MGC之间通信的主要协议, 目前应用较为广 泛的有 H. 248/MeGaCo和 MGCP两种协议。 以 H. 248协议为例, MG上的各种资 源被抽象表示为终端(Termination )。终端又分为物理终端和临时终端, 前者代表一些具有半永久存在性的物理实体, 例如 TDM通道等, 后者代表 一些临时申请用后释放的公共资源, 例如 RTP流等。 终端之间的组合被抽 象表示为上下文(Context ) 。 上下文可以包含多个终端, 因而可以用拓 朴 ( Topology ) 来描述终端间的相互关系。
基于协议的这种抽象模型, 呼叫的接续实际上就是对终端和上下文 的操作。 这种操作通过 MGC和 MG之间的命令 ( Command )请求和响应来完 成。 命令所携带的参数, 也称为描述符 ( Descriptor ) , 这些描述符被 划分为属性(Property )、信号(Signal )、事件(Event )、统计( Statis t ic ) 等类别。 具有业务相关性的参数逻辑上聚合成为包(Package ) 。
信号被 MGC用来指示 MG进行相应资源的操作, 例如向用户放拨号音、 回铃音、 忙音等。 事件被 MGC用来指示 MG进行相应状态的监测, 例如监测 用户是否摘机、 是否挂机、 拨号的内容、 是否拍叉等。 事件一般是受某 种状态变化所触发并可能产生相应的响应操作, 例如用户摘机后才向用 户放拨号音。
然而, 在 H. 248协议的既有定义中, 事件必须首先由 MGC下发给 MG,
然后 MG才能对相应的状态变化启动监测。 尽管从 MGC和 MG是控制者和 被控制者的角度看来, 这种机制对于通常情况是适合的。 然而, 针对一 些特定情况, 这种机制就存在一些缺陷。 例如, MG在向 MGC注册成功后, 需要立即启动对 MGC 激活状态的监测, 这可通过 MG 上报休止超时 (Inact ivi ty Timeout, 指 MG监测到来自 MGC的消息的静默期超过了预 定时间)事件触发 MGC回复响应来实现。 然而按照协议现有的定义, 如果 MGC 因为没有配置、 突然故障或传输失败等等原因没有将该事件下发到 MG, MG就不对 MGC的激活状态进行监测。从而导致 MG可能因失去 MGC的 控制而不能正常工作, 使网络系统的某个部分在特定的情况下处于瘫痪 状态, 从而降低了网络系统的稳定性。 发明内容 针对现有技术的上述缺陷, 本发明的目的是提供一种媒体网关监测 并上报事件的方法, 从而解决了在某些特殊情况下媒体网关未能得到媒 体网关控制器下发的事件而产生的系统问题, 提高了网络系统的稳定性。
为实现本发明的目的, 本发明提供了一种媒体网关监测并上报事件 的方法, 包括:
在媒体网关上预置需要监测的事件;
当媒体网关运行时, 媒体网关对预置的事件进行监测, 并将监测结 果上报给媒体网关控制器。
其中所述在媒体网关上预置的事件符合媒体网关控制器和媒体网关 之间的协定。
媒体网关控制器和媒体网关对所述预置事件的协定包括使用相同的 参数和相同的请求标识。
其中所述事件为媒体网关可监测的事件。
所述的步骤 B还包括: 在媒体网关对预置的事件监测期间, 当媒体网 关控制器向媒体网关下发已在媒体网关上预置的事件及相关参数和请求 标识时, 所述媒体网关对媒体网关控制器下发的事件及相关参数和请求 标识进行监测。
当媒体网关控制器下发的已在媒体网关上预置的事件具有生命周 期, 在所述的生命周期内, 媒体网关对媒体网关控制器下发的事件及相 关参数和请求标识进行监测。
当媒体网关控制器下发的已在媒体网关上预置的事件具有生命周 期, 在所述的生命周期之外, 媒体网关以媒体网关所预置的事件及相关 参数和请求标识进行监测。
当媒体网关控制器下发的已在媒体网关上预置的事件没有生命周 期, 媒体网关持续对媒体网关控制器下发的事件及相关参数和请求标识 进行监测。
在媒体网关上预置事件的方法包括自动方式或人工方式。
在媒体网关上预置事件的方法包括: 软件编码内嵌或控制台操作或 网管操作。
所述在媒体网关上预置的事件是定时器超时事件。
根据本发明, 通过在 MG上预置事件, 在 MG启动后自动地监测事件 的状态, 并将监测结果上报 MGC, 这样, 就避免了 MGC因各种原因未能下 发事件给 MG而产生的系统问题, 从而提高了系统的稳定性。 附图说明
图 1示出了在下一代网中 MGC和 MG的组网示意图;
图 2示出了本发明的方法流程图。 具体实施方式 为了便于本领域一般技术人员理解和实现本发明, 下面参照附图详 细描绘本发明的实施例。
通常情况, 事件由 MGC下发给 MG。 本发明中, 在 MG上事先预置需要监 测的事件, 使 MG可根据事件对相应的状态进行监测, 例如监测用户是否 摘机、 是否挂机、 拨号的内容、 是否拍叉、 网络是否故障、 质量是否告 警、 定时器是否超时等。 当事件由 MGC下发给 MG时, 需要附带请求标识 ( Reques t ID ) 以及可能需要的参数。 这种下发的事件也称请求 ( Reques ted )事件。 一旦 MG监测到这些事件发生某些变化, 就将相应的
事件上报给 MGC, 并附带有上述相同的请求标识以及可能需要的参数。 这 种上报的事件也称观测 (Observed )事件。 请求事件和观测事件通过相 同的请求标识来关联。 请求事件和观测事件附带的参数可能不同。 本发明提供了一种 MG自动监测事件并上报 MGC的方法, 其基本思想 是: 在 MG上预置所需监测的事件; 当 MG运行时, MG对预置的事件进行自 动监测, 并将监测结果上报给 MGC。
如图 1所示, 在步骤 1中, 用户根据需要在 MG上可以预置任意的事件, 如用户摘机、 挂机、 拨号、 拍叉、 网络故障、 质量告警、 定时器超时等 媒体网关可监测的事件。 在步骤 2中, 当 MG运行时, 同时启动这些预置的 事件。 在步骤 3中, MG对这些预置的事件进行监测。 在步骤 4中, MG把监 测的结果上报给 MGC, 在步骤 5中, MG等待 MGC的响应, 并根据响应做出处 理。 在 MG上预置事件应符合 MGC和 MG之间协定, 如使用相同的参数和相同 的请求标识。 这样, MGC将不会对收到预置在 MG上的事件上报做出错误的 响应。 现以 Inact ivi ty Timeout事件(该事件为一个定时器超时事件用于
MG监测 MGC状态 ) 为例来具体说明本发明的作用。 首先介绍该定时器作用。 当在 MG上启动该定时器后, MGC发往 MG的任 何消息都将会使 MG复位该定时器, 从而使该定时器不会超时, 如果一直 得不到 MGC的消息而最终导致 MG上该定时器超时, 那么 MG将向 MGC上报该 事件。 MGC若对该上 ^艮有响应则可认为 MGC仍然正常, MG继续按上述流程 检测 MGC状态, 反之则可认为 MGC不再正常, MG需要启动异常处理机制, 例如重新向备份的 MGC注册。
利用本发明, 首先在 MG上预置 Inact ivi ty Timeout事件及其参数 Maximum Inact ivi ty Time值(例如 30秒)和清求标识 (例如 0 ) , 当 MG 启动并向 MGC注册成功后, MG将启动 Inact ivi ty Timeout事件, 也即以参 数 Maximum Inact ivi ty Time的值作为定时器的时长, 并对 MGC来的消息 开始进行监测。 这时若 MGC出现故障, 则 MG无法得到 MGC来的消息以复位 该定时器, 一旦该定时器超时 MG就将以预置的请求标识上^艮111&01: ^ 3^7
T imeout事件给 MGC。 如果 MGC对 MG上报的该事件没有响应, MG就会启动异 常处理机制, 例如重新向备份的 MGC注册。 这样就消除了可能因 MGC没有 下发该事件而使 MG无法启该事件的监测, 也就无法知道 MGC故障而导致系 统瘫痪的隐患。 在 MG上预置事件可以有自动或人工方式, 如软件编码内嵌、 控制台 操作、 网管操作等。 在 MG对预置的事件进行监测期间, 这时若 MGC向 MG下发已在 MG上预置 的事件,以 MGC下发该事件时所携带的相关参数和请求标识为准,即以 MGC 下发的该事件及相关参数和请求标识进行监测。 若该事件存在有生命周 期, 在生命周期内, MG以 MGC下发的该事件及相关参数和请求标识进行监 测, 在生命周期之外, MG以 MG预置的该事件及相关参数和请求标识进行 监测。 若该事件没有生命周期, MG对该事件的监测持续以 MGC下发的该事 件及相关参数和请求标识为准。 因此, 根据本发明, 通过在 MG上预置事件, 在 MG启动后自动地监测 事件的状态, 并将监测结果上报 MGC , 这样, 就避免了 MGC因各种原因未 能下发事件给 MG而产生的系统问题, 从而提高了系统的稳定性。 虽然通过实施例描绘了本发明, 但本领域普通技术人员知道, 在不 脱离本发明的精神和实质的情况下, 就可使本发明有许多变形和变化, 本发明的保护范围由所附的权利要求来限定。
Claims
1. 一种媒体网关监测并上报事件的方法, 其特征在于, 包括: 在媒体网关上预置需要监测的事件;
当媒体网关运行时, 媒体网关对预置的事件进行监测, 并将监测结 果上报给媒体网关控制器。
2. 根据权利要求 1所述的媒体网关监测并上报事件的方法, 其特征 在于, 所述在媒体网关上预置的事件符合媒体网关控制器和媒体网关之 间的协定。
3. 根据权利要求 2所述的媒体网关监测并上报事件的方法, 其特征 在于, 媒体网关控制器和媒体网关对所述预置事件的协定包括使用相同 的参数和相同的请求标识。
4. 才 居权利要求 1所述的媒体网关监测并上报事件的方法, 其特征 在于, 所述在媒体网关上预置的事件为媒体网关可监测的事件。
5. 根据权利要求 1所述的媒体网关监测并上报事件的方法, 其特征 在于, 在媒体网关对预置的事件监测期间, 当媒体网关控制器向媒体网 关下发已在媒体网关上预置的事件及相关参数和请求标识时, 所述媒体 网关对媒体网关控制器下发的事件及相关参数和请求标识进行监测。
6. 根据权利要求 5所述的媒体网关监测并上报事件的方法, 其特征 在于, 当媒体网关控制器下发的已在媒体网关上预置的事件具有生命周 期, 在所述事件的生命周期内, 所述媒体网关对媒体网关控制器下发的 事件及相关参数和请求标识进行监测。
7. 根据权利要求 5所述的媒体网关监测并上报事件的方法, 其特征 在于, 当媒体网关控制器下发的已在媒体网关上预置的事件具有生命周 期, 在所述事件的生命周期之外, 所述媒体网关对媒体网关所预置的事 件及相关参数和请求标识进行监测。
8. 根据权利要求 5所述的媒体网关监测并上报事件的方法, 其特征 在于, 当媒体网关控制器下发的已在媒体网关上预置的事件没有生命周
期, 所述媒体网关持续对媒体网关控制器下发的事件及相关参数和请求 标识进行监测。
9. 根据权利要求 1所述的媒体网关监测并上报事件的方法, 其特征 在于, 在媒体网关上预置事件的方法包括自动方式或人工方式。
10.根据权利要求 1所述的媒体网关监测并上报事件的方法, 其特征 在于, 在媒体网关上预置事件的方法包括: 软件编码内嵌或控制台操作 或网管操作。
11.根据权利要求 1所述的媒体网关监测并上报事件的方法, 其特征 在于, 所述在媒体网关上预置的事件是定时器超时事件。
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AU2006201331B2 (en) | 2008-07-17 |
HK1088465A1 (en) | 2006-11-03 |
US8614953B2 (en) | 2013-12-24 |
AU2006201331A1 (en) | 2006-11-02 |
CA2542088A1 (en) | 2006-10-15 |
JP4372765B2 (ja) | 2009-11-25 |
EP1713229A1 (en) | 2006-10-18 |
US8134926B2 (en) | 2012-03-13 |
CA2830273A1 (en) | 2006-10-15 |
ATE423424T1 (de) | 2009-03-15 |
CN100342693C (zh) | 2007-10-10 |
DE602006005187D1 (de) | 2009-04-02 |
KR100833673B1 (ko) | 2008-05-29 |
BRPI0601591B1 (pt) | 2018-03-13 |
US20060233109A1 (en) | 2006-10-19 |
CA2830273C (en) | 2014-05-27 |
JP2006304298A (ja) | 2006-11-02 |
ES2322714T3 (es) | 2009-06-25 |
KR20060109333A (ko) | 2006-10-19 |
BRPI0601591A (pt) | 2006-12-05 |
CN1794665A (zh) | 2006-06-28 |
US20120057470A1 (en) | 2012-03-08 |
EP1713229B1 (en) | 2009-02-18 |
CA2542088C (en) | 2014-01-07 |
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