WO2007041910A1 - Procede et systeme de transmission de donnees - Google Patents

Procede et systeme de transmission de donnees Download PDF

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Publication number
WO2007041910A1
WO2007041910A1 PCT/CN2006/001311 CN2006001311W WO2007041910A1 WO 2007041910 A1 WO2007041910 A1 WO 2007041910A1 CN 2006001311 W CN2006001311 W CN 2006001311W WO 2007041910 A1 WO2007041910 A1 WO 2007041910A1
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Prior art keywords
calling
media gateway
called
message packet
packet
Prior art date
Application number
PCT/CN2006/001311
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English (en)
French (fr)
Inventor
Futao Xiao
Original Assignee
Huawei Technologies Co., Ltd.
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Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to CN200680012136.8A priority Critical patent/CN101160882A/zh
Publication of WO2007041910A1 publication Critical patent/WO2007041910A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/14—Systems for two-way working
    • H04N7/141—Systems for two-way working between two video terminals, e.g. videophone
    • H04N7/148—Interfacing a video terminal to a particular transmission medium, e.g. ISDN
    • 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
    • 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
    • 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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0435—Details
    • H04Q11/0471—Terminal access circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges
    • H04Q3/0029—Provisions for intelligent networking
    • H04Q3/0045—Provisions for intelligent networking involving hybrid, i.e. a mixture of public and private, or multi-vendor systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13196—Connection circuit/link/trunk/junction, bridge, router, gateway
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13209—ISDN
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13296—Packet switching, X.25, frame relay
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13389—LAN, internet

Definitions

  • the present invention relates to the field of data communications, and more particularly to a method and system for transmitting data over an IP network in a next generation network.
  • Next Generation Network is a public telecommunication network based on IP technology. It can accommodate various forms of information and realize the transmission and management of audio, video and data signals under a unified management platform. Providing various broadband applications and traditional telecommunication services, it is an integrated service network that truly realizes broadband narrowband integration, wired and wireless integration, active and passive integration, and transmission access integration.
  • the next generation network supports ISDN (Integrated Services Digital Network) access and application.
  • ISDN Integrated Services Digital Network
  • the ISDN terminal accesses the media gateway, and the media gateways are connected through the IP network.
  • IP IP network
  • an IP connection is established for each circuit, and the data packets of each calling circuit are transparently transmitted to the corresponding through the corresponding IP connection.
  • the called circuit The format of the packet is H.221 message packet.
  • H.221 protocol refer to LC-Text: Recommendation H.221 "Frame Structure for a 64 to 1920 Kbit/s Channel in Audiovisual Teleservices", which is hereby incorporated by reference.
  • the IP network has a large delay, and multiple IP links may take different routes. Therefore, the data of multiple IP links may be inconsistent. Affects normal communication. At the same time, if the network communication quality is unreliable, if a link loses heavily, it affects the data aggregation of other links, causing data packets of other links to be lost.
  • the object of the present invention is to solve the problem that the data is not synchronized and the communication quality is affected due to inconsistent routing of multiple IP links in the ISDN data transmission process.
  • the present invention provides a data transmission method for calling media
  • the data is transmitted between the gateway and the called media gateway through the IP bearer link, and the method includes the following steps:
  • the calling media gateway receives the message packet transmitted by the calling ISDN terminal through multiple calling circuits, and converts the message packet into a data packet suitable for transmission by a single IP bearer link;
  • the calling media gateway transmits the data packet to the called media gateway through only one IP bearer link
  • the called media gateway parses the data packet, and transmits the parsed data packet to the called ISDN terminal through a plurality of called circuits.
  • the method further comprises the steps of:
  • the calling media gateway receives the message packet transmitted by the calling ISDN terminal through multiple calling circuits, and parses the message packet to obtain audio and video streams;
  • the calling media gateway transmits the audio and video stream to the called media gateway only through a bearer link;
  • the called media gateway repackages the audio and video stream into a message packet of the same format as the message packet sent by the calling ISDN terminal, and transmits the repackaged message packet to the called ISDN terminal through a plurality of called circuits. .
  • the method further comprises the steps of:
  • the calling media gateway receives the message packet transmitted by the calling ISDN terminal through multiple calling circuits, adds circuit markings on the message packets from different calling circuits, and marks the calling circuit to which each message packet belongs;
  • the calling media gateway transmits the circuit tagged message packet to the called media gateway through only one IP bearer link;
  • the called media gateway parses the message packet, and according to the circuit tag in the message packet, transmits the message packet to the called ISDN terminal through a plurality of called circuits corresponding to the corresponding calling circuit.
  • the IP bearer link further includes a standby IP bearer link
  • the calling media gateway periodically checks the status of the current IP bearer link, and when the current IP bearer link is found to be unavailable, the message packet is transmitted to the called media gateway through the standby IP bearer link.
  • the message packet is in the H.221 format.
  • the present invention further provides a data transmission system, the system
  • the system includes a calling media gateway and a called media gateway, and the data is transmitted between the calling media gateway and the called media gateway through an IP bearer link, where the calling media gateway is used to:
  • the called media gateway is used to:
  • the data packet is parsed, and the parsed data packet is transmitted to the called ISDN terminal through a plurality of called circuits.
  • the calling media gateway is further configured to:
  • the called media gateway is further used to:
  • the audio and video streams are repackaged into a message packet of the same format as the message packet sent by the calling ISDN terminal, and the re-encapsulated message packet is transmitted to the called ISDN terminal through a plurality of called circuits.
  • the calling media gateway is further configured to: receive a message packet transmitted by the calling ISDN terminal through multiple calling circuits, and add a circuit marking on the message packet from different calling circuits. Marking the calling circuit to which each message packet belongs, and transmitting the circuit tagged message packet to the called media gateway through only one IP bearer link; the called media gateway is further used to:
  • the message packet is parsed, and according to the circuit tag in the message packet, the message packet is transmitted to the called ISDN terminal through a plurality of called circuits corresponding to the corresponding calling circuit.
  • the IP bearer link further includes a standby IP bearer link
  • the calling media gateway periodically checks the status of the current IP bearer link, and when the current IP bearer link is found to be unavailable, the message packet is transmitted to the called media gateway through the standby IP bearer link.
  • the message packet is in the H.221 format.
  • the data of multiple links passes through the IP network, and the delay is fixed.
  • multiple IP addresses are avoided.
  • the data caused by inconsistent link routes is out of sync.
  • FIG. 1 is a schematic diagram of an implementation of transmitting data over an IP network in the prior art
  • FIG. 2 is a schematic diagram of an implementation of transmitting data over an IP network provided by the present invention.
  • the calling media gateway and the called media gateway transmit data only through one IP link, preventing data transmission through multiple IP links, due to IP routing. Inconsistent, the data aggregation of the called ISDN terminal fails, affecting normal communication.
  • the calling media gateway after receiving the H.221 message packet transmitted by the calling ISDN terminal through multiple circuits, the calling media gateway terminates the H.221 protocol process, and performs a single circuit.
  • the transmitted H.221 message packet is parsed into an audio and video stream according to a frame header search, and the audio and video streams are sent to the called media gateway through a single IP link.
  • the called media gateway After receiving the audio and video streams sent by the calling media gateway, the called media gateway repackages the frame format into H.221, and then transmits the repackaged H.221 message packet to the called ISDN terminal through multiple circuits.
  • the calling media gateway does not parse the H.221 message packet sent by the calling ISDN terminal through multiple circuits, and adds the circuit to the H.221 message packet received from different circuits. Marking, marking the calling circuit to which each message packet belongs, for example, adding a circuit flag 1 before the H.221 message packet received from the circuit 1, adding a circuit flag 2 before the message packet received from the circuit 2, and the like. Then, the calling media gateway transmits the circuit-marked H.221 message packet to the called media gateway through an IP link.
  • the called media gateway After receiving the H.221 message packet sent by the calling media gateway, the called media gateway analyzes the circuit tag in the message packet, and sends the message packet to the called circuit corresponding to the circuit tag, such as the message packet marked with 1 through the chain. Road 4 is sent to the called ISDN terminal.
  • the media gateway does not need to perform specific protocol processing, but only plays a role of forwarding, which reduces the complexity of the media gateway.
  • a standby IP link is established between the media gateways for each call, and the calling media gateway periodically detects the status of the primary IP link, and when the primary IP link is found to be unavailable. , the data is sent to the called media gateway through the alternate IP link.
  • the delay of the data transmitted from the multiple links through the IP network is fixed, and multiple IPs are avoided.
  • the data caused by inconsistent link routes is out of sync.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Communication Control (AREA)

Description

一种数据传输方法及系统
技术领域 本发明属于数据通信领域，尤其涉及在下一代网络中通过 IP网络传输 数据的方法和系统。
背景技术
下一代网络（NGN, Next Generation Network )是一个建立在 IP技术 基础上的公共电信网络， 能够容纳各种形式的信息， 在统一的管理平台下， 实现音频、 视频、 数据信号的传输和管理， 提供各种宽带应用和传统电信 业务， 是一个真正实现宽带窄带一体化、 有线无线一体化、 有源无源一体 化、 传输接入一体化的综合业务网络。
下一代网络支持 ISDN ( Integrated Services Digital Network, 综合业务 数字网）接入和应用， 如图 1所示， ISDN终端之间具有多个电话号码， 每 个电话号码对应一个或两个 64K的电路， 实现多种速率的视频通话， 带宽 从 128k ~ 2M及以上。 ISDN终端接入媒体网关， 媒体网关之间通过 IP网 络进行连接， 在软交换的控制下为每条电路建立一个 IP连接， 每条主叫电 路的数据包通过对应的 IP 连接透传到相应的被叫电路。 数据包的格式为 H.221消息包。 有关 H.221协议的详细内容参见 LC-Text: Recommendation H.221 "Frame Structure for a 64 to 1920 Kbit/s Channel in Audiovisual Teleservices" , 本发明在此引用， 不再赘述。
在这种接入方式下， 由于 IP网络的延迟比较大， 多条 IP链路可能走 不同的路由， 因而多条 IP链路的数据到达对端的时间会不一致， 导致对端 电路数据聚合失败， 影响正常的通信。 同时， 在网络通信质量不可靠的情 况下， 如果某一链路丟包严重， 影响其他链路的数据汇聚， 造成其他链路 的数据包丟失。
发明内容
本发明的目的在于解决在 ISDN数据传输过程中， 由于多条 IP链路路 由不一致， 导致数据不同步， 影响通信质量的问题。
为了实现发明目的， 本发明提供了一种数据传输方法， 用于主叫媒体 网关与被叫媒体网关之间通过 IP承载链路传送数据， 所述方法包括下述步 骤：
A.主叫媒体网关接收主叫 ISDN终端通过多条主叫电路传送的消息包， 将所述消息包转换为适合于单条 IP承载链路传输的数据包；
B.主叫媒体网关仅通过一条 IP承载链路将所述数据包传送到被叫媒体 网关；
C.被叫媒体网关对所述数据包进行解析处理， 将解析处理后的数据包 通过多条被叫电路传送到被叫 ISDN终端。
在本发明的一个实施例中， 所述方法进一步包括下述步骤：
A1.主叫媒体网关接收主叫 ISDN终端通过多条主叫电路传送的消息 包， 解析所述消息包得到音频和视频流；
B1.主叫媒体网关仅通过一奈 ΪΡ承载链路将所述音频和视频流传送到 被叫媒体网关；
C1.被叫媒体网关将所述音频和视频流重新封装成与主叫 ISDN终端发 送的消息包格式相同的消息包， 通过多条被叫电路将重新封装后的消息包 传送给被叫 ISDN终端。
在本发明的另一个实施例中， 所述方法进一步包括下述步骤：
A2.主叫媒体网关接收主叫 ISDN终端通过多条主叫电路传送的消息 包， 在来自于不同主叫电路的消息包上添加电路标记， 标记每个消息包所 属的主叫电路；
B2.主叫媒体网关仅通过一条 IP承载链路将添加电路标记的消息包传 送到被叫媒体网关；
C2.被叫媒体网关解析所述消息包， 根据消息包中的电路标记， 将消息 包通过多条与相应主叫电路对应的被叫电路传送给被叫 ISDN终端。
所述 IP承载链路进一步包括一条备用 IP承载链路；
主叫媒体网关周期性检当前 IP承载链路的状态， 当发现当前 IP承载 链路不可用时， 通过所述备用 IP承载链路将消息包传送给被叫媒体网关。
所述消息包为 H.221格式。
为了实现发明目的， 本发明进一步提供了一种数据传输系统， 所述系 统包括一个主叫媒体网关和被叫媒体网关， 主叫媒体网关与被叫媒体网关 之间通过 IP承载链路传送数据， 所述主叫媒体网关用于：
接收主叫 ISDN终端通过多条主叫电路传送的消息包， 将所述消息包 转换为适合于单条 IP承载链路传输的数据包， 并仅通过一条 IP承载链路 将所述数据包传送到被叫媒体网关；
所述被叫媒体网关用于：
对所述数据包进行解析处理， 将解析处理后的数据包通过多条被叫电 路传送到被叫 ISDN终端。
在本发明的一个实施例中， 所述主叫媒体网关进一步用于：
接收主叫 ISDN终端通过多条主叫电路传送的消息包， 解析所述消息 包得到音频和视频流， 并仅通过一条 IP承载链路将所述音频和视频流传送 到被叫媒体网关；
所述被叫媒体网关进一步用于：
将所述音频和视频流重新封装成与主叫 ISDN终端发送的消息包格式 相同的消息包，通过多条被叫电路将重新封装后的消息包传送给被叫 ISDN 终端。
在本发明的另一个实施例中， 所述主叫媒体网关进一步用于： 接收主叫 ISDN终端通过多条主叫电路传送的消息包， 在来自于不同 主叫电路的消息包上添加电路标记， 标记每个消息包所属的主叫电路， 并 仅通过一条 IP承载链路将添加电路标记的消息包传送到被叫媒体网关； 所述被叫媒体网关进一步用于：
解析所述消息包， 根据消息包中的电路标记， 将消息包通过多条与相 应主叫电路对应的被叫电路传送给被叫 ISDN终端。
所述 IP承载链路进一步包括一条备用 IP承载链路；
主叫媒体网关周期性检当前 IP承载链路的状态， 当发现当前 IP承载 链路不可用时， 通过所述备用 IP承载链路将消息包传送给被叫媒体网关。
所述消息包为 H.221格式。
在本发明中， 由于两个媒体网关之间只有一条 IP链路' 多个链路的数 据通过 IP 网时时延是固定的， 对于多链路的 ISDN呼叫， 避免了多条 IP 链路路由不一致造成的数据不同步。
附图说明
图 1是现有技术中通过 IP网络传送数据的实现原理图；
图 2是本发明提供的通过 IP网络传送数据的实现原理图。
具体实施方式
为了使本发明的目的、 技术方案及优点更加清楚明白， 以下结合附图 及实施例， 对本发明进行进一步详细说明。 应当理解， 此处所描述的具体 实施例仅仅用以解释本发明， 并不用于限定本发明。
在本发明中， 无论主叫 ISDN终端采用多大带宽进行呼叫， 主叫媒体 网关与被叫媒体网关之间只通过一条 IP链路传送数据， 防止通过多条 IP 链路传输数据时， 由于 IP路由不一致，造成被叫 ISDN终端数据聚合失败， 影响正常通信。
如图 2所示， 作为本发明的一个实施例， 主叫媒体网关在接收到主叫 ISDN终端经多条电路传送过来的 H.221消息包后， 终结 H.221协议过程， 对从单个电路发送的 H.221消息包按照帧头搜索的方式解析得到音频和视 频流， 将音频和视频流通过单条 IP链路发送到被叫媒体网关。 被叫媒体网 关收到主叫媒体网关发送过来的音频和视频流后， 重新封装成 H.221 的帧 格式， 然后通过多条电路将重新封装的 H.221消息包传送到被叫 ISDN终 端。
在本发明的另一个实施例中， 主叫媒体网关对主叫 ISDN终端经多条 电路发送的 H.221消息包不进行解析处理， 将从不同电路上接收的 H.221 消息包加上电路标记， 标记每个消息包所属的主叫电路， 例如在从电路 1 接收到的 H.221消息包前加电路标记 1 , 在从电路 2接收到的消息包前加 电路标记 2等。 然后， 主叫媒体网关通过一条 IP链路将进行电路标记后的 H.221消息包传送到被叫媒体网关。 被叫媒体网关接收到主叫媒体网关 发送的 H.221消息包后， 分析消息包中的电路标记， 将消息包发送到电路 标记对应的被叫电路， 如将标记为 1的消息包通过链路 4发给被叫 ISDN 终端。 在本实施例中，媒体网关不需要做具体协议的处理， 只是起一个 转发的作用， 减少了媒体网关的复杂度。 为了提高数据传输的可靠性， 在本发明中在媒体网关之间为每个呼叫 建立一条备用 IP链路， 主叫媒体网关周期性检测主 IP链路的状态， 当发 现主 IP链路不可用时， 则通过备用 IP链路将数据发送到被叫媒体网关。
在本发明中 , 由于主叫媒体网关和被叫媒体网关之间通过一条 IP链路 传输数据， 因此从多个链路传送的数据通过 IP网时的时延是固定的， 避免 了多条 IP链路路由不一致造成的数据不同步。
以上所述仅为本发明的较佳实施例而已， 并不用以限制本发明， 凡在 本发明的精神和原则之内所作的任何修改、 等同替换和改进等， 均应包含 在本发明的保护范围之内。

Claims

权 利 要 求
1、一种数据传输方法，用于主叫媒体网关与被叫媒体网关之间通过 IP 承载链路传送数据， 其特征在于， 所述方法包括下述步骤：
A.主叫媒体网关接收主叫 ISDN终端通过多条主叫电路传送的消息包， 将所述消息包转换为适合于单条 IP承载链路传输的数据包；
B.主叫媒体网关仅通过一条 IP承载链路将所述数据包传送到被叫媒体 网关；
C.被叫媒体网关对所述数据包进行解析处理， 将解析处理后的数据包 通过多条被叫电路传送到被叫 ISDN终端。
2、 如权利要求 1所述的数据传输方法， 其特征在于， 所述方法进一步 包括下述步骤：
A1.主叫媒体网关接收主叫 ISDN终端通过多条主叫电路传送的消息 包， 解析所述消息包得到音频和视频流；
B1.主叫媒体网关仅通过一条 IP承载链路将所述音频和视频流传送到 被叫媒体网关；
C1.被叫媒体网关将所述音频和视频流重新封装成与主叫 ISDN终端发 送的消息包格式相同的消息包， 通过多条被叫电路将重新封装后的消息包 传送给被叫 ISDN终端。
3、 如权利要求 1所述的数据传输方法， 其特征在于， 所述方法进一步 包括下述步骤：
A2.主叫媒体网关接收主叫 ISDN终端通过多条主叫电路传送的消息 包， 在来自于不同主叫电路的消息包上添加电路标记， 标记每个消息包所 属的主叫电路；
B2.主叫媒体网关仅通过一条 IP承载链路将添加电路标记的消息包传 送到被叫媒体网关;
C2.被叫媒体网关解析所述消息包， 根据消息包中的电路标记， 将消息 包通过多条与相应主叫电路对应的被叫电路传送给被叫 ISDN终端。
4、 如权利要求 1、 2或 3所述的数据传输方法， 其特征在于， 所述 IP 承载链路进一步包括一条备用 IP承载链路；
主叫媒体网关周期性检当前 IP承载链路的状态， 当发现当前 IP承载 链路不可用时 , 通过所述备用 IP承载链路将消息包传送给被叫媒体网关。
5、 如权利要求 1、 2或 3所述的数据传输方法， 其特征在于， 所述消 息包为 H.221格式。
6、 一种数据传输系统， 所述系统包括一个主叫媒体网关和被叫媒体网 关， 主叫媒体网关与被叫媒体网关之间通过 IP承载链路传送数据， 其特征 在于，
所述主叫媒体网关用于：
接收主叫 ISDN终端通过多条主叫电路传送的消息包， 将所述消息包 转换为适合于单条 IP承载链路传输的数据包， 并仅通过一条 IP承载链路 将所述数据包传送到被叫媒体网关；
所述被叫媒体网关用于：
对所述数据包进行解析处理， 将解析处理后的数据包通过多条被叫电 路传送到被叫 ISDN终端。
7、 如权利要求 5所述的数据传输系统， 其特征在于， 所述主叫媒体网 关进一步用于：
接收主叫 ISDN终端通过多条主叫电路传送的消息包， 解析所述消息 包得到音频和视频流， 并仅通过一条 IP承载链路将所述音频和视频流传送 到被叫媒体网关；
所述被叫媒体网关进一步用于：
将所述音频和视频流重新封装成与主叫 ISDN终端发送的消息包格式 相同的消息包，通过多条被叫电路将重新封装后的消息包传送给被叫 ISDN 终端。
8、 如权利要求 6所述的数据传输系统， 其特征在于， 所述主叫媒体网 关进一步用于：
接收主叫 ISDN终端通过多条主叫电路传送的消息包， 在来自于不同 主叫电路的消息包上添加电路标记， 标记每个消息包所属的主叫电路， 并 仅通过一条 IP 载链路将添加电路标记的消息包传送到被叫媒体网关； 所述被叫媒体网关进一步用于：
解析所述消息包， 根据消息包中的电路标记， 将消息包通过多条与相 应主叫电路对应的被叫电路传送给被叫 ISDN终端。
9、 如权利要求 6、 7或 8所述的数据传输系统， 其特征在于， 所述 IP 承载链路进一步包括一条备用 IP承载链路；
主叫媒体网关周期性检当前 IP承载链路的状态， 当发现当前 IP承载 链路不可用时， 通过所述备用 IP承载链路将消息包传送给被叫媒体网关。
10、 如杈利要求 6、 7或 8所述的数据传输系统， 其特征在于， 所述消 息包为 H.221格式。
PCT/CN2006/001311 2005-10-14 2006-06-13 Procede et systeme de transmission de donnees WO2007041910A1 (fr)

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