WO2006017969A1 - A method for ip fax implement synchronous switch - Google Patents

A method for ip fax implement synchronous switch Download PDF

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Publication number
WO2006017969A1
WO2006017969A1 PCT/CN2005/000868 CN2005000868W WO2006017969A1 WO 2006017969 A1 WO2006017969 A1 WO 2006017969A1 CN 2005000868 W CN2005000868 W CN 2005000868W WO 2006017969 A1 WO2006017969 A1 WO 2006017969A1
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WO
WIPO (PCT)
Prior art keywords
fax
media gateway
event
notification message
network
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2005/000868
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English (en)
French (fr)
Inventor
Yi Wang
Xiaoqu Zhang
Xin Lu
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ZTE Corp
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ZTE Corp
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Filing date
Publication date
Application filed by ZTE Corp filed Critical ZTE Corp
Priority to US11/573,778 priority Critical patent/US9131081B2/en
Priority to EP05757369.3A priority patent/EP1780956B1/en
Publication of WO2006017969A1 publication Critical patent/WO2006017969A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Definitions

  • the present invention relates to an IP (Internet Protocol) network based facsimile technology, and more particularly to an IP network fax reliability assurance technique.
  • IP Internet Protocol
  • IP FAX IP-based fax
  • PSTN Public Switched Telephone Network
  • NGN Next Generation Network
  • Whether the fax can be successfully completed depends on the compatibility of the fax machine itself. Due to the diversity of the fax machine, the prior art cannot complete the 100% compatibility coverage test for all fax machines, and it is impossible to foresee the performance parameters of the future fax machine.
  • the IP FAX has a media switching process due to its own implementation mechanism. Therefore, how to ensure the synchronization of the MG (Media Gateway) media switching between the fax sender and the receiver becomes a key technology for improving the fax success rate, and the existing IP FAX technology switching method.
  • the object of the present invention is to provide a method for synchronously switching a fax based on an IP network, which realizes successful switching and synchronous switching of media gateways of both faxes.
  • the present invention provides a method for synchronously switching a fax based on an IP network, including the following steps: First, the media gateway that detects the user side fax event sends a fax event notification message to the peer media gateway;
  • the media gateway that detects the user side fax event switches to the fax mode
  • the peer media gateway After receiving the fax event notification message, the peer media gateway switches to the fax mode.
  • the foregoing method for implementing the synchronous switching of the IP network-based fax, wherein the step of sending the fax event notification message to the peer media gateway specifically includes the following steps:
  • the media gateway detects the occurrence of a fax event
  • the foregoing method for synchronously switching an IP network-based fax wherein the sender media gateway and the receiver media gateway detect the occurrence of a fax event by using a calling fax tone signal and a called party fax identification tone signal, respectively.
  • the receiving media gateway will notify the sending media gateway of the called party's fax identification tone signal; or .
  • the sending media gateway will notify the sending media gateway of the calling fax tone signal.
  • the foregoing method for synchronously switching an IP network-based fax wherein the media gateway switches the fax mode to a voice in-band data mode or a third-type fax machine based on an IP-based real-time fax process standard mode.
  • the foregoing method for synchronously switching an IP network-based fax wherein the format of the fax event notification message is a well-known telephone event RTP payload definition standard format or an event notification message packet format.
  • the foregoing method for synchronously switching an IP network-based fax wherein the fax event notification message simultaneously uses a real-time transmission protocol payload of redundant voice data to define redundancy in a standard format.
  • the foregoing method for synchronously switching an IP network-based fax wherein the media gateway switches to a fax mode according to a V.21 preamble signal.
  • the method for implementing synchronous switching by the IP network-based fax of the present invention is that the sender or receiver media gateway sends a fax event notification message to the peer media gateway, so that the media gateways at both ends can perform fax switching simultaneously, thereby enabling the IP network-based fax.
  • the utility model has the characteristics of strong compatibility, high reliability, and switching synchronization, and overcomes the deficiencies of the prior art, in particular, avoids the problem of fax failure caused by the difference of the routing of the bearer network and the cross-domain.
  • FIG. 1 is a network diagram of a system to which the method of the present invention is applied;
  • FIG. 2 is a flow chart showing the implementation of the receiving fax machine of the present invention when the fax is first started
  • FIG. 3 is a flowchart of an implementation when the sending fax machine of the present invention first starts a fax
  • a method for implementing a method for synchronously switching a fax based on an IP network includes at least an IP network 10, a media gateway controller 20 connected to the IP network 10 and communicating with each other, and two media gateways.
  • the media gateway controller 20 is configured to control the establishment and release of the call by the two media gateways 301 and 302.
  • the sender media gateway 301 or the receiver media gateway 302 is configured to detect The fax event occurs, the fax event notification message is sent in time, and the media switching is completed;
  • the peer media gateway is the media gateway that first detects the fax event, the sender media gateway 301 or the receiver media gateway 302 is used to receive the fax event.
  • the notification message, and the fax switching, that is, the media switching, is completed in time; the sending fax machine 401 is connected to the sender media gateway 301 for transmitting the fax; and the receiving fax machine 402 is connected to the receiving media gateway 302 for receiving the fax.
  • the markings at which the fax event begins to occur include: CNG (Calling Fax Tone) signal, CED (Called Fax Tone Recognition) signal and V.21 preamble. Since the CNG signal and the CED signal cannot uniquely identify the beginning of the fax, and both signals are easily misdetected, it is not suitable as the best identifier for fax switching, and the V.21 preamble is the most fax switching. Good logo.
  • the method for realizing synchronous switching of the fax based on IP network of the present invention with reference to FIG. 1 and FIG. 2
  • the implementation process is illustrated by an example.
  • the method of synchronously switching the IP network-based fax of the present invention includes the following steps:
  • the media gateway that first detects the user-side fax event passes the detected fax event.
  • the fax event notification message in the RFC2833 format is sent to the peer media gateway;
  • the media gateway that detects the user-side fax event switches to the fax mode VBD (in-band data) or T.38 (the third-class fax machine based on the IP-based real-time fax process standard);
  • the peer media gateway After receiving the fax event notification message in RFC2833 format, the peer media gateway switches to the fax mode VBD or T.38.
  • the sender media gateway or the receiver media gateway can be used as the media gateway that first detects the user-side fax event, depending on who initiates the fax in the sending fax machine or the receiving fax machine.
  • the receiving media gateway 302 first detects the occurrence of the fax event by receiving the CED signal sent by the fax machine, and sends the fax event through the CED message in RFC2833 format.
  • the peer media gateway is advertised as the sender media gateway 301; the receiving fax machine 402 then sends a V.21 preamble signal, and the receiver media gateway 302 performs fax switching, and notifies the sender media gateway 301 to perform the fax by using the V.21 message in the RFC2833 format. Switch.
  • the sender media gateway 301 first detects the occurrence of the fax event by transmitting the CNG signal sent by the fax machine, and transmits the fax event through the CNG message in the RFC2833 format.
  • the peer media gateway is advertised as the receiver media gateway 401; then the sending fax machine 401 sends a V.21 preamble, the sender media gateway 301 performs fax switching, and notifies the receiving media gateway 302 to fax through the V.21 message in RFC2833 format. Switch.
  • the fax event notification message can use the redundancy of RFC2198 (RTP payload definition standard for redundant voice data) to avoid network impact, especially in the case of poor network conditions, such as when the packet loss rate is greater than 5%.
  • RFC2198 RTP payload definition standard for redundant voice data
  • the method for implementing the synchronous switching of the IP network-based fax of the present invention includes The following steps: The media gateway that first detects the user-side fax event passes the detected fax event.
  • a fax event notification message in the format of a NoticePacket is sent to the peer media gateway;
  • the media gateway detecting the user side fax event is switched to the fax mode VBD or T.38; after receiving the fax event notification message in the NoticePacket format, the peer media gateway switches to the fax mode VBD or T.38;
  • This embodiment is the same as the first embodiment except that the format of the fax event notification message is the same as that of the first embodiment, and the same features will not be described again.
  • the format of the NoticePacket can be RTP (Real-Time Transport Protocol), RTCP (Real-Time Transport Control Protocol), UDPTL (User Datagram Protocol Transport Layer Protocol), but since RTP and UDPTL are carriers for constructing media streams, they are not suitable for control. Purpose, so the above message interaction is more suitable for using APP (application custom RTCP packet) message in RTCP.
  • APP application custom RTCP packet
  • the advantage of using RTCP is that the structure of the APP message can be customized, which can fully meet the implementation requirements of this function. At the same time, the APP message does not affect the use of the MG that does not support APP sending, and the risk of fax failure can be minimized.
  • the reliability of the fax synchronous switching is 100%, and the false detection probability is zero; even if the user environment is seriously deteriorated In the case of the case (for example, in a severe packet loss environment), the reliability of the system can still reach this level, that is, the probability of introducing false detection is zero.
  • the reliability of the fax synchronous switching is 100%, and the false detection probability is zero; even if the user environment is seriously deteriorated In the case of the case (for example, in a severe packet loss environment), the reliability of the system can still reach this level, that is, the probability of introducing false detection is zero.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • General Engineering & Computer Science (AREA)
  • Computing Systems (AREA)
  • Human Computer Interaction (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Medical Informatics (AREA)
  • Facsimile Transmission Control (AREA)
  • Facsimiles In General (AREA)
  • Telephonic Communication Services (AREA)

Description

基于 IP网络的传真实现同步切换的方法 技术领域
本发明涉及基于 IP (互联网协议） 网络的传真技术， 尤其涉及 IP网络传 真的可靠性保证技术。 背景技术
IP FAX (基于 IP网络的传真）相比传统的 PSTN (公共电话交换网）传 真， 可以节省长途电话费， 由于 NGN (下一代网络） 的普及， IP FAX也将迅 速普及。 现有 IP FAX技术存在一个无法避免的环节， 即从语音向传真的媒体 切换过程，该媒体切换过程的同步性影响传真的正常流程， 因此如何合理、彻 底的解决同步切换问题， 将直接影响到 IP FA 的实用性。
传真能否顺利完成还取决于传真机自身的兼容性， 由于传真机的多样性， 现有技术无法完成对所有传真机的 100%兼容性覆盖测试， 更无法预见未来传 真机的性能参数， 加上 IP FAX由于本身实现机制存在媒体切换的过程， 所以 如何保证传真发送方和接收方两端的 MG (媒体网关）媒体切换的同步成为提 高传真成功率的关键技术， 现有 IP FAX技术的切换方法包括以下两种方案： 通过检测 TDM (时分多工）侧传真事件作为切换的唯一条件， 但由于传 真信号耦合性问题， 即发送传真机在没有收到接收传真机的完整 V.21 (基于 300 bps的传真操作标准， ITU-T V.21 )信号之前不会主动产生 V.21信号， 存 在发送方或接收方媒体网关无法检测到传真事件的可能， 造成切换失败； 受控于 MGC (媒体网关控制器） 的切换， 该方案存在以下问题： 这种方 案只能保证 MGC下发给两个媒体网关的信令是同时的， 但是由于 MGC与接 收方、 发送方媒体网关之间的路由不同， 造成两个媒体网关无法同步切换。 发明内容
本发明的目的在于提供一种基于 IP网络的传真实现同步切换的方法， 实 现传真双方的媒体网关的成功切换和同步切换。
为了实现上述目的， 本发明提供了一种基于 IP网络的传真实现同步切换 的方法， 包括以下步骤： 首先检测到用户侧传真事件的媒体网关发送传真事件通知消息到对端媒 体网关；
首先检测到用户侧传真事件的媒体网关切换到传真模式；
所述对端媒体网关收到所述传真事件通知消息后， 切换到传真模式。 上述的基于 IP网络的传真实现同步切换的方法， 其中， 所述发送传真事 件通知消息到对端媒体网关的步骤具体包括以下步骤：
媒体网关检测到传真事件的发生；
将传真事件通知对端媒体网关；
将传真事件通知消息发送到对端媒体网关。
上述的基于 IP网络的传真实现同步切换的方法， 其中， 发送方媒体网关 和接收方媒体网关分别通过主叫传真音信号和被叫端传真识别音信号检测传 真事件的发生。
上述的基于 IP网络的传真实现同步切换的方法， 其中， 将传真事件通知 对端媒体网关的步骤具体为：
若接收传真机先启动传真，接收方媒体网关将被叫端传真识别音信号通告 发送方媒体网关； 或 .
若发送方传真机先启动传真，发送方媒体网关将主叫传真音信号通告发送 方媒体网关。
上述的基于 IP网络的传真实现同步切换的方法， 其中， 所述媒体网关切 换传真模式为语音带内数据模式或第三类传真机基于 IP的实时传真过程标准 模式。
上述的基于 IP网络的传真实现同步切换的方法， 其中， 所述传真事件通 知消息的格式为知名电话事件 RTP载荷定义标准格式或事件通知消息包格式。
上述的基于 IP网络的传真实现同步切换的方法， 其中， 所述传真事件通 知消息为事件通知消息包格式时，所述传真事件通知消息利用应用自定义的实 时传输控制协议包消息承载。
上述的基于 IP网络的传真实现同步切换的方法， 其中， 所述传真事件通 知消息同时采用冗余语音数据的实时传输协议载荷定义标准格式的冗余。
上述的基于 IP网络的传真实现同步切换的方法， 其中， 所述媒体网关根 据 V.21前导信号切换到传真模式。 本发明的基于 IP网络的传真实现同步切换的方法由于发送方或接收方媒 体网关向对端媒体网关发出传真事件通知消息，使得两端媒体网关得以同步进 行传真切换， 从而使得基于 IP网络的传真具有兼容性强、 可靠性高、 切换同 步的特点，克服了现有技术的不足，尤其是避免了由于承载网路由的差异和跨 域造成的传真失败问题。
以下结合附图和具体实施例对本发明进行详细描述，但不作为对本发明的 限定。 附图说明
图 1是本发明方法应用的系统组网图；
图 2是本发明接收传真机先启动传真时的实现流程图； 及
图 3是本发明发送传真机先启动传真时的实现流程图； 具体实施方式
请参考图 1所示， 本发明基于 IP网络的传真实现同步切换的方法应用的 系统至少包括 IP网络 10，连接到 IP网络 10且互相通讯的媒体网关控制器 20 和两个媒体网关.（包括发送方媒体网关 301和接收方媒体网关 302)， 以及和 发送方媒体网关 301和接收方媒体网关 302分别相连的传真机 401和 402。
其中， 媒体网关控制器 20用于控制两个媒体网关 301和 302完成呼叫的 建立和释放； 当作为首先检测到传真事件的媒体网关时， 发送方媒体网关 301 或接收方媒体网关 302用于检测传真事件的发生， 及时发出传真事件通知消 息，并完成媒体切换； 当作为首先检测到传真事件的媒体网关的对端媒体网关 时， 发送方媒体网关 301或接收方媒体网关 302用于接收传真事件通知消息， 并及时完成传真切换即媒体切换;发送传真机 401与发送方媒体网关 301相连， 用于发送传真； 接收传真机 402与接收方媒体网关 302相连， 用于接收传真。
传真事件开始发生的标识包括： CNG (主叫传真音） 信号， CED (被叫 端传真识别音）信号和 V.21前导信号。 由于 CNG信号、 CED信号无法唯一 标识传真的开始，并且这两个信号都是单频信号易被误检，所以不宜作为传真 切换的最佳标识， 而 V.21前导信号则是传真切换的最佳标识。
下面结合图 1和图 2对于本发明基于 IP网络的传真实现同步切换的方法 的实现流程进行举例说明。
假设媒体网关支持 RFC2833 (知名电话事件 RTP载荷定义标准）格式的 传真事件通知消息的发送、 接收， 假设发送方媒体网关， 则本发明的基于 IP 网络的传真实现同步切换的方法包括以下步骤：
首先检测到用户侧传真事件的媒体网关将检测到的传真事件通过
RFC2833格式的传真事件通知消息发送至对端媒体网关；
首先检测到用户侧传真事件的媒体网关切换至传真模式 VBD (语音带内 数据） 或者 T.38 (第三类传真机基于 IP的实时传真过程标准）；
对端媒体网关收到该 RFC2833格式的传真事件通知消息后， 切换至传真 模式 VBD或者 T.38。
其中，发送方媒体网关或接收方媒体网关均可作为首先检测到用户侧传真 事件的媒体网关， 视发送传真机或接收传真机中谁先启动传真而定。
结合图 1和图 2所示，若接收传真机 402先启动传真，则接收方媒体网关 302通过接收传真机发出的 CED信号首先检测到传真事件的发生， 并通过 RFC2833格式的 CED消息将传真事件通告对端媒体网关即发送方媒体网关 301； 之后接收传真机 402发出 V.21前导信号， 接收方媒体网关 302进行传真 切换， 并通过 RFC2833格式的 V.21消息通知发送方媒体网关 301进行传真切 换。
结合图 1和图 3所示，若发送传真机 401先启动传真，则发送方媒体网关 301 通过发送传真机发出的 CNG信号首先检测到传真事件的发生， 并通过 RFC2833 格式的 CNG消息将传真事件通告对端媒体网关即接收方媒体网关 401； 之后发送传真机 401发出 V.21前导信号， 发送方媒体网关 301进行传真 切换， 并通过 RFC2833格式的 V.21消息通知接收方媒体网关 302进行传真切 换。
另外， 传真事件通知消息可同时采用 RFC2198 (冗余语音数据的 RTP载 荷定义标准）格式的冗余来避免网络影响， 尤其在网络状况较差的情况， 例如 丢包率大于 5%时。
假设媒体网关不支持 RFC2833格式的传真事件通知消息的发送、 接收， 其他条件与支持 RFC2833格式的传真事件通知消息的发送、 接收的相同， 则 本发明的基于 IP网络的传真实现同步切换的方法包括以下步骤： 首先检测到用户侧传真事件的媒体网关将检测到的传真事件通过
NoticePacket (事件通知消息包）格式的传真事件通知消息发送至对端媒体网 关；
首先检测到用户侧传真事件的媒体网关切换至传真模式 VBD或者 T.38; 对端媒体网关收到该 NoticePacket格式的传真事件通知消息后，切换至传 真模式 VBD或者 T.38;
本实施例除传真事件通知消息格式与第一实施例不同外， 其他流程均相 同， 对于相同的特征不再赘述。
NoticePacket的格式可以采用 RTP (实时传输协议）、 RTCP (实时传输控 制协议）、 UDPTL (用户数据报协议传输层协议）， 但由于 RTP、 UDPTL是用 于构成媒体流的载体， 不适合作为控制的用途， 因此上述的消息交互中采用 RTCP中 APP (应用自定义的 RTCP包） 消息更为适宜。 使用 RTCP的优点是 APP消息的结构是可以自定义的，完全可以满足本功能的实现要求，同时采用 APP消息不会影响不支持 APP发送的 MG的使用， 可将传真失败的风险降到 最低。
据大量实验统计表明， 在各种常见用户环境下， 采用本发明基于 IP网络 的传真实现同步切换的方法， 传真同步切换的可靠率为 100%， 误检测概率为 零； 即使在用户环境严重恶化的情况下 （例如丢包严重的环境下）， 本系统的 可靠率仍然能达到这一水平， 即引入的误检测概率为零。
当然，本发明还可有其它多种实施例，在不背离本发明精神及其实质的情 况下，熟悉本领域的技术人员当可根据本发明作出各种相应的改变和变形，但 这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。 工业应用性
据大量实验统计表明， 在各种常见用户环境下， 采用本发明基于 IP网络 的传真实现同步切换的方法， 传真同步切换的可靠率为 100%， 误检测概率为 零； 即使在用户环境严重恶化的情况下 （例如丢包严重的环境下）， 本系统的 可靠率仍然能达到这一水平， 即引入的误检测概率为零。

Claims

权利要求书
1、 一种基于 IP网络的传真实现同步切换的方法， 包括以下步骤： 首先检测到用户侧传真事件的媒体网关发送传真事件通知消息到对端媒 体网关；
首先检测到用户侧传真事件的媒体网关切换到传真模式；
所述对端媒体网关收到所述传真事件通知消息后， 切换到传真模式。
2、根据权利要求 1所述的基于 IP网络的传真实现同步切换的方法，其特 征在于，所述发送传真事件通知消息到对端媒体网关的步骤具体又包括以下步 骤：
媒体网关检测到传真事件的发生；
将传真事件通知对端媒体网关；
将传真事件通知消息发送到对端媒体网关。
3、 根据权利要求 1或 2所述的基于 IP网络的传真实现同步切换的方法， 其特征在于，发送方媒体网关和接收方媒体网关分别通过主叫传真音信号和被 叫端传真识别音信号检测传真事件的发生。
4、根据权利要求 2所述的基于 IP网络的传真实现同步切换的方法，其特 征在于， 将传真事件通知对端媒体网关的步骤具体为：
若接收传真机先启动传真，接收方媒体网关将被叫端传真识别音信号通告 发送方媒体网关； 或
若发送方传真机先启动传真，发送方媒体网关将主叫传真音信号通告发送 方媒体网关。
5、 根据权利要求 1、 2或 4所述的基于 IP网络的传真实现同步切换的方 法，其特征在于，所述媒体网关切换传真模式为语音带内数据模式或第三类传 真机基于 IP的实时传真过程标准模式。
6、 根据权利要求 1、 2或 4所述的基于 IP网络的传真实现同步切换的方 法， 其特征在于， 所述传真事件通知消息的格式为知名电话事件 RTP载荷定 义标准格式或事件通知消息包格式。
7、根据权利要求 6所述的基于 IP网络的传真实现同步切换的方法，其特 征在于，所述传真事件通知消息为事件通知消息包格式时，所述传真事件通知 消息利用应用自定义的实时传输控制协议包消息承载。
8、 根据权利要求 1、 2或 4所述的基于 IP网络的传真实现同步切换的方 法，其特征在于，所述传真事件通知消息同时采用冗余语音数据的实时传输协 议载荷定义标准格式的冗余。
9、 根据权利要求 1、 2或 4所述的基于 IP网络的传真实现同步切换的方 法， 其特征在于， 所述媒体网关根据 V.21前导信号切换到传真模式。
10、 根据权利要求 5所述的基于 IP网络的传真实现同步切换的方法， 其 特征在于， 所述媒体网关根据 V. 21前导信号切换到传真模式。
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EP1780956B1 (en) 2018-08-22
CN1738245A (zh) 2006-02-22
CN100502287C (zh) 2009-06-17
EP1780956A4 (en) 2009-11-11
EP1780956A1 (en) 2007-05-02
US20070211302A1 (en) 2007-09-13
US9131081B2 (en) 2015-09-08

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