CN104703049A - Network address translation (NAT) traversal method for media stream message, media distribute unit (MDU) and internet protocol television (IPTV) system - Google Patents

Network address translation (NAT) traversal method for media stream message, media distribute unit (MDU) and internet protocol television (IPTV) system Download PDF

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Publication number
CN104703049A
CN104703049A CN201310661435.6A CN201310661435A CN104703049A CN 104703049 A CN104703049 A CN 104703049A CN 201310661435 A CN201310661435 A CN 201310661435A CN 104703049 A CN104703049 A CN 104703049A
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China
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stb
information
network
nat
yuan
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CN201310661435.6A
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Chinese (zh)
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丁向军
董红
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中兴通讯股份有限公司
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Publication of CN104703049A publication Critical patent/CN104703049A/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00Network arrangements or network protocols for addressing or naming
    • H04L61/25Network arrangements or network protocols for addressing or naming mapping of addresses of the same type; address translation
    • H04L61/2503Internet protocol [IP] address translation
    • H04L61/256Network address translation [NAT] traversal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements or protocols for real-time communications
    • H04L65/60Media handling, encoding, streaming or conversion
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/647Control signaling between network components and server or clients; Network processes for video distribution between server and clients, e.g. controlling the quality of the video stream, by dropping packets, protecting content from unauthorised alteration within the network, monitoring of network load, bridging between two different networks, e.g. between IP and wireless
    • H04N21/64707Control signaling between network components and server or clients; Network processes for video distribution between server and clients, e.g. controlling the quality of the video stream, by dropping packets, protecting content from unauthorised alteration within the network, monitoring of network load, bridging between two different networks, e.g. between IP and wireless for transferring content from a first network to a second network, e.g. between IP and wireless

Abstract

The invention provides a network address translation (NAT) traversal method for a media stream message, a media distribute unit (MDU) and an internet protocol television (IPTV) system. The method comprises the steps of sending binary information of a second network corresponding to the MDU to a set top box (STB) through a signal when the STB in a first network and the MDU of the second network transmits data mutually through the NAT; acquiring binary information of the second network corresponding to the STB through an NAT message from the STB, wherein the binary information comprises an IP address and port information; and sending the media stream message to the STB through the NAT, wherein the destination address information of the media stream message is the binary information of the second network corresponding to the STB. Through adoption of the method, the MDU can establish a media stream with the STB of a private network, so that NAT traversal of the media stream is realized, and normal operation of the IPTV system is guaranteed.

Description

媒体流报文的NAT穿越方法、MDU及IPTV系统 Media stream packet NAT traversal methods, MDU and IPTV systems

技术领域 FIELD

[0001] 本发明涉及通信领域,具体而言,涉及一种媒体流报文的网络地址转换(NetworkAddress Translat1n,简称为NAT)穿越方法、媒体分发单兀(Media Distribute UNIT,简称为MDU)及网络协定电视(Internet Protocol Televis1n,简称为IPTV)系统。 [0001] The present invention relates to communication field, particularly, to a packet of the media stream network address translation (NetworkAddress Translat1n, referred to simply as NAT) traversal method, a single media distribution Wu (Media Distribute UNIT, abbreviated as MDU) network, and Agreement on TV (Internet Protocol Televis1n, referred to as IPTV) system.

背景技术 Background technique

[0002] 由于公网IP地址已经成为一种稀缺资源,现有的企业级应用多采用组建自己的私有网络,企业内部的网络设备全部隐藏在私网后面。 [0002] Since the public IP address has become a scarce resource, existing enterprise applications to use more set up their own private network, internal corporate network devices are all hidden behind the private network. 企业内部的网络采用私有编址并通过NAT/防火墙来控制与公共网络的通信。 Internal corporate network using private addressing and to control communications with the public network through NAT / firewall. NAT/防火墙能够完成私有编址与公网编址的相互转化,并设置相应的包过滤规则,让不满足条件的IP包不能够穿透NAT/防火墙。 NAT / firewall into each other to complete the private and public network addressing addressing, and set the appropriate packet filtering rules to allow IP packet does not meet the criteria can not penetrate NAT / firewall. NAT/防火墙对超文本传输协议(Hypertext transfer protocol,简称为HTTP)、实时流传输协议(Real Time Streaming Protocol,简称为RTSP)等端口固定的一般应用协议,只需要转换IP/传输控制协议(Transmiss1n Control Protocol,简称为TCP)/用户数据报协议(UserDatagram Protocol,简称为UDP)头,即可很好地实现穿透,但在控制信息中的媒体流端口是动态协商的,信令协议里面的IP地址也是私有的,而私有IP地址在公网上是不能路由的。 NAT / firewall Hypertext Transfer Protocol (Hypertext transfer protocol, referred to as HTTP), Real Time Streaming Protocol (Real Time Streaming Protocol, referred to as RTSP) and other port fixed general application protocol, only need to convert IP / Transmission Control Protocol (Transmiss1n control protocol, abbreviated as TCP) / user datagram protocol (UserDatagram protocol, abbreviated as UDP) header, to achieve a good penetration, but the media stream port in the control information is dynamic negotiation, the signaling protocol inside IP address is private, but private IP address is not in the public internet routing.

[0003] 在相关技术的IPTV系统中,大量的机顶盒(Set Top Box,简称为STB)也可能隐藏在私有网络的后面。 [0003] In the IPTV system of the related art, a large number of set top boxes (Set Top Box, referred to as STB) may also be hidden behind the private network. 在这种情况下,由于在信令建链时由私网中的STB主动向IPTV系统发起,会打通通道,因此,在STB与IPTV系统交互操作时信令流链路可以正常建立。 In this case, since actively initiate a private network to the IPTV STB system when a signaling link set, the channel will be open, therefore, normal signaling flow link established when interacting with the IPTV STB system operation. 图1是根据相关技术的媒体流建立失败的示意图,如图1所示,在建立媒体流时,由于STB的地址为私有地址,媒体分发单元根据STB的私有地址将无法正常建立媒体流。 FIG 1 is a schematic flow setup failed media according to the related art, as shown, when creating a media stream, since the address of the STB private address, a media distribution unit according to the private address of the STB can not establish a normal media stream.

[0004] 针对相关技术中媒体分发单元无法与私网中的STB建立媒体流的问题,目前尚未提出有效的解决方案。 [0004] for media distribution unit can not establish a stream of questions from the media and the private network in the STB related art, we have not yet come up with effective solutions.

发明内容 SUMMARY

[0005] 本发明提供了一种媒体流报文的NAT穿越方法、MDU及IPTV系统,以至少解决上述问题。 [0005] The present invention provides a media stream message NAT traversal method, and an MDU IPTV system to at least solve the above problems.

[0006] 根据本发明的一个方面,提供了一种媒体流报文的NAT穿越方法,第一网络中的STB通过NAT与第二网络的MDU交互数据,该方法包括:通过信令将所述MDU对应的第二网络二元信息发送给所述STB ;通过来自所述STB的NAT报文获取所述STB对应的第二网络二元信息,其中,二元信息包括:IP地址和端口信息;将目的地址信息为所述STB对应的第二网络二元信息的媒体流报文经由所述NAT发送至所述STB。 [0006] In accordance with one aspect of the present invention, there is provided a method of NAT traversal of the media stream packet, the first network through the STB NAT MDU interaction data and the second network, the method comprising: signaling by the MDU two yuan second network information is sent to the corresponding STB; two yuan obtaining information of the second network through the STB corresponding to the packet from the NAT STB, wherein binary information includes: IP address and port information; two yuan media information of the second network destination address information corresponding to the STB via the NAT stream message sent to the STB.

[0007] 优选地,在通过所述NAT报文获取所述STB对应的所述第二网络二元信息之前,所述方法还包括:所述NAT接收所述STB发送的源地址信息为所述STB在所述第一网络中的第一网络二元信息的所述NAT报文;所述NAT转化所述NAT报文的源地址信息为所述STB对应的所述第二网络二元信息;所述NAT发送转化后的所述NAT报文至所述MDU,其中,所述MDU通过转化后的所述NAT报文的源地址信息获取所述STB对应的所述第二网络二元信肩、O Before [0007] Preferably, in the NAT packet acquired by the STB corresponding to the second two yuan network information, the method further comprising: receiving the source address of the NAT information sent to the STB the first NAT packet STB two yuan network information in said first network; transforming the source address of the NAT NAT information packet to the second network to the STB corresponding to two yuan information; after transmitting the converted packet to the NAT NAT MDU, wherein said MDU obtaining the STB corresponding to the shoulder of the second channel by two yuan network after conversion of the NAT information packet source address , O

[0008] 优选地,所述方法还包括:根据所述NAT报文中携带的鉴权信息,对所述STB进行鉴权;其中,在对所述STB的鉴权成功的情况下,所述MDU执行获取所述STB对应的所述第二网络二元信息之后的步骤。 [0008] Preferably, the method further comprising: the authentication information carried in the packet to the NAT, and authenticating the STB; wherein the authentication is successful in the case of STB, the MDU step after acquiring the second network corresponding to two yuan STB information.

[0009] 优选地,在对所述STB的鉴权成功的情况下,在通过所述NAT报文获取所述STB对应的所述第二网络二元信息之后,所述方法还包括:发送所述STB对应的第二网络二元信息和用于指示对所述STB的鉴权为成功的鉴权成功响应至主控处理单元(Main ProcessorUnit,简称为MPU);根据所述MPU响应于所述鉴权成功响应的、用于指示将所述STB创建为用户的指示信息,确定发送所述媒体流报文至所述STB,其中,在所述指示信息中指示所述媒体流报文的目的地址信息为所述STB对应的第二网络二元信息。 After [0009] Preferably, the authentication is successful in the case of STB, by acquiring the NAT packet corresponding to the STB two yuan second network information, the method further comprising: transmitting the STB corresponding to said second network information for two yuan STB indicating the successful authentication is an authentication success response to the main processing unit (main ProcessorUnit, abbreviated as MPU); in response to the MPU according to the authentication success response for creating the STB indicating the user indication information, determining to send the media stream message to the STB, which indicates the media stream message object in said indication information two yuan network address information of the second information corresponding to the STB.

[0010] 优选地,将目的地址信息为所述STB对应的第二网络二元信息的所述媒体流报文经由所述NAT发送至所述STB包括:发送所述媒体流报文至所述NAT ;所述NAT转化所述媒体流报文的目的地址信息为所述STB在所述第一网络中的第一网络二元信息;所述NAT发送转化后的所述媒体流报文至所述STB。 [0010] Preferably, the second media information, two yuan network destination address information corresponding to the STB via the NAT stream message sent to the STB comprises: sending the media stream message to the NAT; destination address information into the packet of the media stream to the STB NAT two yuan first network information in said first network; the media stream message sent after the conversion to the NAT said STB.

[0011] 根据本发明的另一个方面,还提供了一种MDU,位于第二网络中,通过NAT与第一网络中的STB交互数据,所述MDU包括:第一发送模块,用于通过信令将所述MDU对应的第二网络二元信息发送给所述STB ;获取模块,用于通过来自所述STB的NAT报文获取所述STB对应的第二网络二元信息,其中,二元信息包括:IP地址和端口信息;第二发送模块,用于将目的地址信息为所述STB对应的第二网络二元信息的媒体流报文经由所述NAT发送至所述STB。 [0011] According to another aspect of the present invention, there is provided an MDU, located in the second network by the first NAT with the STB interaction data network, said MDU includes: a first sending module, configured by the letter transmitting a second network so that the two yuan MDU information corresponding to the STB; obtaining module, a second two yuan network NAT information packet from the STB, the STB acquired by a corresponding, wherein the binary information includes: IP address and port information; and a second transmitting module, a second network for two yuan media information and destination address information corresponding to the STB via the NAT stream message sent to the STB.

[0012] 根据本发明的另一个方面,还提供了一种IPTV系统,包括:NAT、位于第一网络中的STB和位于第二网络中的MDU,其中:所述MDU通过所述NAT与所述STB连接,用于通过信令将所述MDU对应的第二网络二元信息发送给所述STB ;通过来自所述STB的NAT报文获取所述STB对应的第二网络二元信息,其中,二元信息包括:IP地址和端口信息;以及将目的地址信息为所述STB对应的第二网络二元信息的媒体流报文经由所述NAT发送至所述STB。 [0012] According to another aspect of the present invention, there is provided an IPTV system, comprising: NAT, located in a first network and STB MDU in the second network, wherein: the MDU by the NAT and the STB said connection for transmission via the signaling network MDU corresponding to the second information to the STB two yuan; two yuan obtaining information of the second network through the STB corresponding to the packet from the NAT STB, wherein binary information includes: IP address and port information; and the second media information, two yuan network destination address information corresponding to the STB stream message sent to the NAT via the STB.

[0013] 优选地,所述NAT用于接收所述STB发送的源地址信息为所述STB在所述第一网络中的第一网络二元信息的所述NAT报文,转化所述NAT报文的源地址信息为所述STB对应的所述第二网络二元信息,并发送转化后的所述NAT报文至所述MDU,其中,所述MDU通过转化后的所述NAT报文的源地址信息获取所述STB对应的所述第二网络二元信息。 [0013] Preferably, the NAT information for receiving the source address of the STB is transmitted to the STB in a first network two yuan the first network the NAT information packet, the converted packet NAT address information of the source packets to the STB corresponding to the second two yuan network information, and the sending of the packet to the NAT conversion MDU, wherein said MDU after the packets by converting NAT obtaining the source address information of the second network corresponding to two yuan STB information.

[0014] 优选地,所述MDU还用于根据所述NAT报文中携带的鉴权信息,对所述STB进行鉴权。 [0014] Preferably, the MDU further according to the authentication information carried in packet NAT, the STB performs authentication.

[0015] 优选地,所述MDU还用于在对所述STB的鉴权成功的情况下,发送所述STB对应的第二网络二元信息和用于指示对所述STB的鉴权为成功的鉴权成功响应至MPU ;以及根据所述MPU响应于所述鉴权成功响应的、用于指示将所述STB创建为用户的指示信息,确定发送所述媒体流报文至所述STB,其中,在所述指示信息中指示所述媒体流报文的目的地址信息为所述第二网络二元信息。 [0015] Preferably, the MDU further authentication is successful for the case where the STB, the STB corresponding to the second transmission network information, and for two yuan STB indicating the authentication success authentication success response to the MPU; and the MPU according to a response to the authentication success response for creating the STB indicating the user indication information, determining to send the media stream message to the STB, wherein, the destination address information indicating the media stream message indication information in the network for the second two yuan information.

[0016] 优选地,所述MDU还用于发送所述媒体流报文至所述NAT ;所述NAT还用于转化所述媒体流报文的目的地址信息为所述STB在所述第一网络中的第一网络二元信息,并发送转化后的所述媒体流报文至所述STB。 [0016] Preferably, the MDU further configured to send the media stream message to the NAT; for the purposes of further NAT address information into the packet of the media stream to the STB in the first the first two yuan network information on the network, the media stream conversion and transmits the message to the STB.

[0017] 通过本发明,在第一网络中的STB通过NAT与第二网络的MDU交互数据的情况下,采用通过信令将MDU对应的第二网络二元信息发送给STB ;通过来自STB的NAT报文获取STB对应的第二网络二元信息,其中,二元信息包括:IP地址和端口信息;将目的地址信息为STB对应的第二网络二元信息的媒体流报文经由NAT发送至STB的方式,解决了媒体分发单元无法与私网中的STB建立媒体流的问题,实现了媒体流的NAT穿越,保证了IPTV系统的正常运行。 [0017] By the present invention, the first network in the case where the STB via the second network NAT MDU interactive data, by using the corresponding second MDU signaling information to the network two yuan STB; from the STB by NAT packet information obtaining two yuan STB corresponding to the second network, wherein the binary information includes: IP address and port information; and a second network medium two yuan destination address information corresponding to the STB information stream message sent via the NAT to STB way to solve the problem of media distribution unit can not establish a media stream in the STB and the private network, to achieve the NAT traversal media stream, to ensure the normal operation of the IPTV system.

附图说明 BRIEF DESCRIPTION

[0018] 此处所说明的附图用来提供对本发明的进一步理解,构成本申请的一部分,本发明的示意性实施例及其说明用于解释本发明,并不构成对本发明的不当限定。 [0018] The drawings described herein are provided for further understanding of the present invention, constitute a part of this application, exemplary embodiments of the present invention are used to explain the present invention without unduly limiting the present invention. 在附图中: In the drawings:

[0019] 图1是根据相关技术的媒体流建立失败的示意图; [0019] FIG. 1 is a schematic flow setup failed media according to the related art;

[0020] 图2是根据本发明实施例的媒体流报文的NAT穿越方法的流程示意图; [0020] FIG. 2 is a schematic diagram of the embodiment according to the flow of media stream packet The method of NAT traversal of the embodiment of the present invention;

[0021] 图3是根据本发明实施例的媒体分发单元的结构示意图; [0021] FIG. 3 is a schematic view of the distribution unit according to an embodiment of the present invention, the media;

[0022] 图4是根据本发明实施例的IPTV系统的结构示意图; [0022] FIG. 4 is a diagram showing the configuration of an IPTV system according to an embodiment of the present invention;

[0023] 图5是根据本发明优选实施例的IPTV系统的结构示意图。 [0023] FIG. 5 is a schematic structural diagram of an IPTV system according to a preferred embodiment of the present invention.

具体实施方式 Detailed ways

[0024] 需要说明的是,在不冲突的情况下,本申请中的实施例及实施例中的特征可以相互组合。 [0024] Incidentally, in the case of no conflict, embodiments and features of the embodiments of the present application can be combined with each other. 下面将参考附图并结合实施例来详细说明本发明。 Below with reference to accompanying drawings and embodiments of the present invention will be described in detail.

[0025] 在附图的流程图示出的步骤可以在诸如一组计算机可执行指令的计算机系统中执行,并且,虽然在流程图中示出了逻辑顺序,但是在某些情况下,可以以不同于此处的顺序执行所示出或描述的步骤。 [0025] The steps shown in the flowchart drawings can be executed in a computer system, such as a set of computer-executable instructions, and, although in the flowchart shown in a logical order, but in some cases, may be different order of performing the steps shown or described.

[0026] 根据相关技术中的NAT穿越技术,第一网络中的STB可以通过NAT与第二网络的MDU交互数据,其中,STB与MDU之间的信令流可以穿透NAT。 [0026] The NAT traversal related art technology, the first network through the STB may MDU NAT interaction data and the second network, wherein the signaling flow between the STB and the MDU may penetrate NAT. 为了实现媒体流的穿透,本实施例提供了一种媒体流报文的NAT穿越方法,图2是根据本发明实施例的媒体流报文的NAT穿越方法的流程示意图,如图2所示,该流程包括如下步骤: In order to achieve penetration of the media stream, the present embodiment provides a method of NAT traversal of the media stream message, FIG. 2 is a schematic flow diagram of an example of a media stream packet NAT traversal method according to the present embodiment of the invention, shown in Figure 2 , the process comprising the steps of:

[0027] 步骤S202,通过信令将MDU对应的第二网络二元信息发送给STB ; [0027] step S202, the second signaling network via two yuan MDU corresponding information to the STB;

[0028] 步骤S204,通过来自该STB的NAT报文获取STB对应的第二网络二元信息,其中,二元信息包括:ip地址和端口信息; [0028] step S204, the STB acquiring information corresponding to the second network by two yuan NAT packets from the STB, wherein binary information includes: IP address and port information;

[0029] 步骤S206,将目的地址信息为该STB对应的第二网络二元信息的媒体流报文经由NAT发送至STB。 [0029] step S206, the destination address information corresponding to the second media network for the STB two yuan NAT information packet stream transmitted to the STB via.

[0030] 通过上述步骤,采用通过信令将MDU对应的第二网络二元信息传递给STB,从而使得STB向MDU发送可以实现正常穿透的NAT报文将STB对应的第二网络二元信息传递给MDU, MDU可以根据该STB对应的第二网络二元信息建立媒体流,即将媒体报文的目的地址信息设置为STB在第二网络二元信息,从而能够正常将媒体报文发送给STB。 [0030] Through the above steps, by using the signaling network to transmit the second MDU information corresponding to two yuan STB, so that the STB can achieve normal transmitted to the MDU penetrate NAT packets STB information corresponding to the second network two yuan transmitted to the MDU, MDU can create a second network according to the media stream information corresponding to two yuan the STB, destination address information is provided for the upcoming media packets in the second network two yuan STB information can be normal to the media packet to the STB . 在一些优选的实施例中,第一网络可以是局域网(即私网),第二网络可以是互联网(即公网),从而解决了媒体分发单元无法与私网中的STB建立媒体流的问题,保证了IPTV系统的正常运行。 In some preferred embodiments, the first network may be a local area network (i.e., private network), the second network may be the Internet (i.e., the public network), thereby solving the problem of media distribution unit can not establish a media stream in the private network and STB to ensure the normal operation of the IPTV system.

[0031] 其中的二元信息是指:IP地址与端口地址对,例如,私网中的多个STB可以通过:公网IP地址和端口地址来进行标示。 [0031] means wherein binary information: IP address and port address, e.g., a private network by a plurality of STB may: be designated a public IP and port addresses. 例如,对于同一个私网中的多个STB而言,其公网IP地址可以是相同的,但在公网IP地址相同的情况下,不同的STB对应的端口地址可以不相同。 For example, a plurality of the same private network in the STB, its public IP address may be the same, but at the same public IP address, the STB corresponding to different port addresses may not be the same.

[0032] 在下列描述中,以第一网络为私网,第二网络为公网为例进行说明。 [0032] In the following description, the first network is a private network, the second network is a public network as an example.

[0033] 优选地,在步骤S204之前,STB发起与IPTV系统中的MDU或MPU的信令交互,在建立信令流链路使得STB获取MDU对应的第二网络二元地址信息之后,STB向NAT发送源地址为私网地址(即私网二元信息)、目的地址为公网地址(即公网二元信息)的NAT报文;NAT接收到报文之后,根据NAT中预设的转化策略,将NAT报文的源地址转化为STB对应的公网地址,并将转化后的NAT报文发送给MDU。 [0033] Preferably, before step S204, the STB initiates a signaling interaction with the IPTV system MDU or MPU, so that the establishment of a signaling flow link corresponding to the second MDU STB acquired network address information after two yuan, the STB NAT private network address of the transmission source address (i.e., two yuan private information), the destination address is the public address (i.e., two yuan public information) NAT packet; packet after receiving NAT, NAT in accordance with a predetermined conversion strategy, the NAT address of the source packet into a public network address corresponding STB and sends the converted text packet NAT to a MDU. 由于转化后的NAT报文的源地址为STB对应的公网地址,因此,MDU可以根据转化后的NAT报文获取STB的公网地址。 Because the source address of the NAT packets into the public network address corresponding STB, therefore, can get an MDU STB public address based on the NAT packet after conversion.

[0034] 优选地,在NAT报文中还携带有鉴权信息,该鉴权信息可以是STB与MPU之间预先协商的。 [0034] Preferably, the NAT packet further carries authentication information, the authentication information may be pre-negotiated between the STB and the MPU. MDU根据该鉴权信息对STB进行鉴权,例如:MDU接收到NAT穿越报文后,MDU可以根据NAT穿越报文中携带的鉴权信息,以及MPU传递给MDU的相应的鉴权信息,对STB进行鉴权;其中,在对STB的鉴权成功的情况下,MDU执行获取STB对应的公网二元信息之后的步骤,例如,执行步骤S206。 MDU to STB performs authentication based on the authentication information, for example: after receiving the MDU NAT traversal message, MDU can be passed to the appropriate authentication information in accordance with the MDU NAT traversal message carries the authentication information, and an MPU, for STB performs authentication; wherein, in the success of the authentication of the STB case, performing the step of obtaining an MDU two yuan public information corresponding to the STB after, e.g., step S206.

[0035] 又例如执行下列步骤:在对STB的鉴权成功的情况下,MDU发送公网二元信息和用于指示对STB的鉴权为成功的鉴权成功响应至MPU ;MPU根据鉴权成功的响应,向MDU返回用于指示将STB创建为用户的指示信息;MDU根据该指示信息,确定发送媒体流报文至STB,其中,在指示信息中指示媒体流报文的目的地址信息为公网二元信息。 [0035] Another example is performing the following steps: success in authentication of STB case, MDU two yuan public network transmission information for indicating a successful authentication of STB authentication success response to the MPU; MPU according to the authentication a successful response, for indicating to the MDU to return the user creates STB indication information; MDU information according to the indication, determining the media stream message sent to the STB, which indicates the destination address information of the media stream packet in the instruction information is two yuan public information.

[0036] 优选地,在步骤S206中,MDU首先发送目的地址为公网二元信息的媒体流报文至NAT ;NAT转化媒体流报文的目的地址信息为STB在私网中的私网二元信息之后,NAT转发转化后的媒体流报文至STB,从而实现了媒体流的建立。 [0036] Preferably, in the step S206, MDU first transmitting destination address information of the public two yuan media stream message to the NAT; NAT conversion media stream message as destination address information in the STB private two private network after the meta information, the media stream packet forwarding NAT conversion to STB, enabling the establishment of a media stream.

[0037] 本实施例还提供了一种MDU,该MDU位于第二网络中的IPTV系统中,该MDU用于实现上述媒体流报文的NAT穿越方法。 [0037] The present embodiment further provides an MDU, the MDU in the second network IPTV system, the MDU NAT traversal method for implementing the above-mentioned media stream packets.

[0038] 其中,该MDU通过NAT与第一网络中的STB交互数据。 [0038] wherein, the MDU by STB interaction data to the first network NAT. 图3是根据本发明实施例的媒体分发单元的结构示意图,如图3所示,该媒体分发单元包括:第一发送模块32、获取模块34和第二发送模块36,其中,第一发送模块32,用于通过信令将MDU对应的第二网络二元信息发送给STB ;获取模块34通过STB耦合至第一发送模块32,用于通过来自STB的NAT报文获取STB对应的第二网络二元信息,其中,二元信息包括:IP地址和端口信息;第二发送模块36耦合至获取模块34,用于将目的地址信息为STB对应的第二网络二元信息的媒体流报文经由NAT发送至STB。 FIG 3 is a schematic structural diagram of a media distribution unit according to the embodiment of the present invention, shown in Figure 3, the media distribution unit comprises: a first sending module 32, an obtaining module 34 and a second sending module 36, wherein the first sending module 32, by the second network for two yuan MDU corresponding signaling information is transmitted to the STB; obtaining module 3432, configured to obtain a second network through a NAT STB corresponding packet from the STB by STB sending module coupled to the first two yuan information, wherein the binary information includes: IP address and port information; a second sending module 36 is coupled to the acquisition module 34, the destination address information for the corresponding media STB two yuan second network via the packet flow information NAT is sent to the STB.

[0039] 本发明的实施例中所涉及到的模块、单元可以通过软件的方式实现,也可以通过硬件的方式来实现。 Example module [0039] The present invention relates to a unit may be implemented by way of software, may be implemented by hardware. 本实施例中的所描述的模块、单元也可以设置在处理器中,例如,可以描述为:一种处理器包括第一发送模块32、获取模块34和第二发送模块36。 The modules described in the present embodiment, the unit may also be provided in a processor, for example, it can be described as: A processor comprising a first sending module 32, an obtaining module 34 and a second sending module 36. 其中,这些模块的名称在某种情况下并不构成对该模块本身的限定,例如,第一发送模块32还可以被描述为“用于通过信令将MDU对应的第二网络二元信息发送给STB的模块”。 Wherein the name of the module, in some cases do not limit the module itself, for example, a first sending module 32 may also be described as a "two yuan for the second network corresponding to information transmitted by the signaling MDU to the STB modules. "

[0040] 优选地,该MDU还用于根据NAT报文中携带的鉴权信息,对STB进行鉴权;其中,在对STB的鉴权成功的情况下,执行第二发送模块36。 [0040] Preferably, the authentication information according to further MDU NAT packet carried in the authentication of the STB; wherein, in the success of the authentication of the STB, the transmission module 36 performs a second.

[0041] 优选地,该MDU还用于在对STB的鉴权成功的情况下,发送STB对应的第二网络二元信息和用于指示对STB的鉴权为成功的鉴权成功响应至MPU ;以及根据MPU响应于鉴权成功响应的、用于指示将STB创建为用户的指示信息,确定发送媒体流报文至STB,其中,在指示信息中指示媒体流报文的目的地址信息为第二网络二元信息。 Authentication [0041] Preferably, the MDU is also used in the successful authentication of the STB, the STB corresponding to the second transmission network information, and for indicating two yuan STB for a successful authentication success response to the MPU ; and the MPU in response to a successful authentication response, for indicating to the user created STB indication information, determining the media stream message sent to the STB, which indicates that the media stream message destination address information in the instruction information for the first two yuan second network information.

[0042] 对应于上述媒体流报文的NAT穿越方法,本实施例还提供了一种IPTV系统,图4是根据本发明实施例的IPTV系统的结构示意图,如图4所示,该系统包括:NAT42、位于第一网络中的STB44和位于第二网络中的MDU46,其中: [0042] The method of NAT traversal corresponds to the media stream packets, the present embodiment also provides an IPTV system, FIG 4 is a schematic structural diagram of an IPTV system according to an embodiment of the present invention, shown in Figure 4, the system comprising : NAT42, located in a first network and in the second STB44 network MDU46, wherein:

[0043] MDU46通过NAT42与STB44连接,用于通过信令将MDU46对应的第二网络二元信息发送给STB44 ;通过来自STB44的NAT报文获取STB44对应的第二网络二元信息,其中,二元信息包括:IP地址和端口信息;以及将目的地址信息为STB44对应的第二网络二元信息的媒体流报文经由NAT42发送至STB44。 [0043] MDU46 by NAT42 and STB44 is connected a second network for transmitting information corresponding to two yuan MDU46 STB44 through signaling; STB44 acquiring information corresponding to a second network by two yuan packet from NAT STB44, wherein two meta information includes: IP address and port information; and the destination address information for the corresponding media stream STB44 packet information via the second network NAT42 two yuan sent to STB44.

[0044] 优选地,NAT42用于接收STB44发送的源地址信息为STB44在第一网络中的第一网络二元信息的NAT报文,转化该NAT报文的源地址信息为STB44对应的第二网络二元信息,并发送转化后的NAT报文至MDU46,其中,MDU46通过转化后的NAT报文的源地址信息获取STB44对应的第二网络二元信息。 [0044] Preferably, NAT42 for receiving the source address information is transmitted STB44 STB44 NAT information packet of the first network two yuan in the first network, the NAT conversion packet source address information corresponding to the second STB44 two yuan network information, and transmits the converted message to the NAT MDU46, wherein, MDU46 two yuan acquiring the second network through the NAT information packet corresponding STB44 the converted source address information.

[0045] 优选地,MDU46还用于根据NAT报文中携带的鉴权信息,对STB44进行鉴权。 [0045] Preferably, MDU46 further configured according to the authentication information carried in the packet NAT, STB44 to authenticate.

[0046] 优选地,MDU46还用于在对STB44的鉴权成功的情况下,发送STB44对应的第二网络二元信息和用于指示对STB44的鉴权为成功的鉴权成功响应至MPU ;以及根据MPU响应于鉴权成功响应的、用于指示将STB44创建为用户的指示信息,确定发送媒体流报文至STB44,其中,在指示信息中指示媒体流报文的目的地址信息为第二网络二元信息。 [0046] Preferably, MDU46 for further authentication is successful in a case of STB44, STB44 corresponding second transmission network information, and two yuan for indicating a successful authentication to the authentication STB44 success response to an MPU; the MPU and a successful response to the authentication response, for indicating to the user created STB44 indication information, determining to send the media stream message STB44, wherein information indicating the destination address in the media stream message is the second indication information two yuan network information.

[0047] 优选地,MDU46还用于发送媒体流报文至NAT42 ;NAT42还用于转化媒体流报文的目的地址信息为STB44在第一网络中的第一网络二元信息,并发送转化后的媒体流报文至STB44。 [0047] Preferably, MDU46 further configured to send the media stream message to NAT42; NAT42 for the purpose of further address information into a media stream message to the first network two yuan STB44 information in the first network, and transmits after conversion the media stream message to STB44.

[0048] 下面结合优选实施例进行描述和说明。 [0048] below with reference to the preferred embodiments described and illustrated.

[0049] 本优选实施例提供了一种IPTV系统中的NAT穿越的处理方法和装置。 [0049] This preferred embodiment provides a method and apparatus for processing in the IPTV system NAT traversal. 以解决媒体分发单元无法与私网中的STB建立媒体流的问题。 To solve the problem of media distribution unit can not establish a media stream and private network STB.

[0050] 图5是根据本发明优选实施例的IPTV系统的结构示意图,如图5所示,该系统包括:机顶盒(STB)、MT/防火墙、交换机(SW)、媒体分发单元(MDU)、主处理单元(MPU)。 [0050] FIG. 5 is a schematic structural diagram of an IPTV system according to a preferred embodiment of the present invention, shown in Figure 5, the system comprising: a set top box (STB), MT / firewalls, switches (SW), a media distribution unit (an MDU), a main processing unit (MPU). 其中,双向箭头表示信令流,可以实现STB和MDU之间的穿透;MDU和MPU之间的步骤S502和步骤S510所对应的箭头表示控制流;其他箭头表示媒体流。 Wherein, the double arrow indicates the signaling flow, penetration may be achieved between the STB and the MDU; MDU and the step between the step S510 and MPU S502 corresponding arrows represent control streams; other arrows indicate the media stream.

[0051] 在本优选实施例中,通过STB、MDU以及MPU之间的相互配合实现NAT穿越。 [0051] In the present preferred embodiment, by the STB, the mutual cooperation between the MPU and implemented MDU NAT traversal.

[0052] 下面结合图5对本优选实施例进行详细阐述。 [0052] FIG. 5 below in connection with the preferred embodiment described in detail. 本优选实施例提供的NAT穿越方法包括如下步骤: NAT traversal method provided in this preferred embodiment comprises the following steps:

[0053] 步骤S502,MPU收到STB发过来的信令后,通过IPTV系统中的内部控制消息通知MDU需要穿越的远端STB的IP/Port及相应的鉴权码;MDU收到MPU穿越请求控制消息后,建立NAT穿越数据区。 After [0053] Step S502, MPU receives signaling sent, STB, IPTV control messages through the internal IP notification system through the distal end of an STB need MDU / Port and corresponding authentication code; MDU request received through the MPU after the control messages to establish NAT traversal data area. 同时MPU会信令回复STB,以使STB获取MDU的外部IP和端口(PORT)。 While the MPU will return signaling STB, STB to allow access to external IP port and an MDU (PORT).

[0054] 步骤S504,STB知道MDU的外口地址信息后,向NAT设备发送NAT穿越媒体报文,其中该NAT穿越媒体报文的源地址为STB的私有地址IPl和Portl,目的地址为MDU的外部IP和PORT,报文中携带有前面给定的鉴权码;这时STB的NAT穿越媒体报文旨在打通MDU到STB之间的媒体链路。 [0054] step S504, the STB knows orifice address information of the MDU, through the media packet to the NAT apparatus NAT, wherein the NAT traversal source address of the media packets to the STB private address IPl and Portl, the destination address is an MDU and external IP PORT, carries a message authentication code given earlier; NAT traversal time STB is intended to open a media packet to a media link between the MDU STB.

[0055] 步骤S506,NAT/防火墙设备将STB的媒体报文源地址的私网地址IPl和Portl转换为公网地址IP2和Port2。 [0055] Step S506, NAT / firewall device private address IPl and Portl STB media packet source address to a public address IP2 and Port2.

[0056] 步骤S508,MDU处理收到的经NAT转化后的STB穿越报文,然后根据前面MPU给的信息进行鉴权,并给STB发送NAT穿越应答包。 [0056] Step S508, STB after MDU by processing the received NAT traversal message conversion, and then performs authentication according to information from the previous MPU and transmits the response packet to the NAT traversal STB.

[0057] 步骤S510,NAT报文鉴权成功,MDU向MPU发送鉴权成功消息,消息中带有STB的公网地址IP2和Port2 ;MPU向MDU下发创建用户的消息,该用户的地址信息就是STB的NAT转换后的公网地址IP2和Port2。 [0057] Step S510, NAT authentication success message, the MPU MDU sends an authentication success message, the message with the public network address IP2 STB and Port2; MPU user created message to send the MDU, the address information of the user STB is after NAT public address IP2 and Port2.

[0058] 步骤S512,MDU使用经NAT转换后的IP2和Port2作为目的地址向STB发送媒体报文。 [0058] Step S512, MDU used as a destination address to the STB sends the media packets IP2 and via Port2 after NAT.

[0059] 步骤S514,NAT设备收到目的地址为IP2,和Port2的媒体报文后进行转发表查找。 [0059] step S514, NAT If the destination is IP2, and after the Port2 media packet forwarding is performed to find.

[0060] 步骤S516,NAT设备从转发表中查找到STB的私网地址IPl和Portl后,将MDU过来的目的地址为IP2和Port2媒体报文替换为IPl和Portl转发到STB。 [0060] step S516, the NAT device from the forwarding table to find private network address IPl STB and Portl, will come MDU destination address IP2 and Port2 media messages forwarded to the STB replacement for the IPl and Portl.

[0061] 可见,通过上述优选实施例,可使MDU与STB之间通过私有的NAT穿越方法实现媒体的NAT穿越功能,从而解决了隐藏在MT/防火墙后面私网STB不能够接收到MDU发出来的媒体流的问题,实现NAT用户的直播功能。 [0061] Therefore, with the above-described preferred embodiment can achieve medium between the MDU NAT and NAT traversal through the private STB method traversal function, thereby solving the hidden MT / STB private network behind a firewall can not be issued to the received MDU problems media streams, implement NAT users to stream live events.

[0062] 以上所述仅是本发明的具体实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。 [0062] The above are only specific embodiments of the present invention, it should be noted that those of ordinary skill in the art, in the present invention without departing from the principles of the premise, can make various improvements and modifications, such modifications and modifications should also be regarded as the protection scope of the present invention.

[0063] 显然,本领域的技术人员应该明白,上述的本发明的各模块或各步骤可以用通用的计算装置来实现,它们可以集中在单个的计算装置上,或者分布在多个计算装置所组成的网络上,可选地,它们可以用计算装置可执行的程序代码来实现,从而,可以将它们存储在存储装置中由计算装置来执行,或者将它们分别制作成各个集成电路模块,或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。 [0063] Obviously, those skilled in the art should understand that the modules or steps of the present invention described above can be used general-purpose computing device, they can be integrated in a single computing device or distributed across multiple computing devices available on the Internet, optionally, they can be implemented with program codes executable by a computing device, so that, to be performed by a computing device stored in a storage device, or they are made into integrated circuit modules, or they plurality of modules or steps are manufactured into a single integrated circuit module. 这样,本发明不限制于任何特定的硬件和软件结合。 Thus, the present invention is not limited to any particular hardware and software combination.

[0064] 以上上述仅为本发明的优选实施例而已,并不用于限制本发明,对于本领域的技术人员来说,本发明可以有各种更改和变化。 [0064] The above description is only preferred embodiments of the present invention, but not intended to limit the invention to those skilled in the art, the present invention may have various changes and variations of the above. 凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。 Any modification within the spirit and principle of the present invention, made, equivalent substitutions, improvements, etc., should be included within the scope of the present invention.

Claims (11)

1.一种媒体流报文的网络地址转换器NAT穿越方法,第一网络中的机顶盒STB通过NAT与第二网络的媒体分发单元MDU交互数据,其特征在于包括: 通过信令将所述MDU对应的第二网络二元信息发送给所述STB ; 通过来自所述STB的NAT报文获取所述STB对应的第二网络二元信息,其中,二元信息包括:IP地址和端口信息; 将目的地址信息为所述STB对应的第二网络二元信息的媒体流报文经由所述NAT发送至所述STB。 1. A media stream message to a network address translator NAT traversal method, the first network distribution unit MDU set-top box STB interaction data by the second network NAT medium, characterized by comprising: signaling by the MDU corresponding to the second network transmits information to the STB two yuan; two yuan obtaining information of the second network through the STB corresponding to the packet from the NAT STB, wherein binary information includes: IP address and port information; and STB is the destination address information corresponding to the second media network two yuan information stream message sent via the NAT to the STB.
2.根据权利要求1所述的方法,其特征在于,在通过所述NAT报文获取所述STB对应的所述第二网络二元信息之前,所述方法还包括: 所述NAT接收所述STB发送的源地址信息为所述STB在所述第一网络中的第一网络二元信息的所述NAT报文; 所述NAT转化所述NAT报文的源地址信息为所述STB对应的所述第二网络二元信息;所述NAT发送转化后的所述NAT报文至所述MDU,其中,所述MDU通过转化后的所述NAT报文的源地址信息获取所述STB对应的所述第二网络二元信息。 2. The method according to claim 1, wherein the NAT packet acquired by the STB before the second network corresponding to two yuan information, the method further comprises: receiving the NAT the NAT information packet the source address of the STB transmits the information to the first network two yuan the STB of the first network; transforming the source address of the NAT NAT information packet corresponding to the STB two yuan information of the second network; after the transmitting the converted packet to the NAT NAT MDU, wherein said obtaining the MDU by the STB corresponding to the converted source address NAT information packet the two yuan second network information.
3.根据权利要求2所述的方法,其特征在于,所述方法还包括: 根据所述NAT报文中携带的鉴权信息,对所述STB进行鉴权; 其中,在对所述STB的鉴权成功的情况下,所述MDU执行获取所述STB对应的所述第二网络二元信息之后的步骤。 3. The method according to claim 2, characterized in that, said method further comprising: the authentication information carried in the packet to the NAT, and authenticating the STB; wherein in the STB, authentication is successful, the step after the MDU is acquiring the network corresponding to the second two yuan STB information.
4.根据权利要求3所述的方法,其特征在于,在对所述STB的鉴权成功的情况下,在通过所述NAT报文获取所述STB对应的所述第二网络二元信息之后,所述方法还包括: 发送所述STB对应的第二网络二元信息和用于指示对所述STB的鉴权为成功的鉴权成功响应至主控处理单元MPU ; 根据所述MPU响应于所述鉴权成功响应的、用于指示将所述STB创建为用户的指示信息,确定发送所述媒体流报文至所述STB,其中,在所述指示信息中指示所述媒体流报文的目的地址信息为所述STB对应的第二网络二元信息。 4. After the method of claim 3, wherein the authentication is successful in the case of STB, the NAT packet by acquiring the STB information corresponding to the second network two yuan the method further comprising: sending the second network corresponding to two yuan STB information for the STB indicating successful authentication is an authentication success response to the master processing unit MPU; the MPU responsive to the the authentication success response for creating the STB indicating the user indication information, determining to send the media stream message to the STB, wherein, in said indication information indicates that the media stream packet two yuan second network information and destination address information corresponding to the STB.
5.根据权利要求1至4中任一项所述的方法,其特征在于,将目的地址信息为所述STB对应的第二网络二元信息的所述媒体流报文经由所述NAT发送至所述STB包括: 发送所述媒体流报文至所述NAT ; 所述NAT转化所述媒体流报文的目的地址信息为所述STB在所述第一网络中的第一网络二元信息; 所述NAT发送转化后的所述媒体流报文至所述STB。 5. The method according to claim 4, claim, wherein the media information of two yuan second network destination address information corresponding to the stream STB to send packets via the NAT the STB comprises: sending the media stream message to the NAT; the NAT transforming the media stream message to the destination address information of the first network two yuan STB information in said first network; NAT after the transmission of the media stream message to the conversion STB.
6.一种媒体分发单元MDU,位于第二网络中,通过网络地址转换器NAT与第一网络中的机顶盒STB交互数据,其特征在于包括: 第一发送模块,用于通过信令将所述MDU对应的第二网络二元信息发送给所述STB; 获取模块,用于通过来自所述STB的NAT报文获取所述STB对应的第二网络二元信息,其中,二元信息包括:IP地址和端口信息; 第二发送模块,用于将目的地址信息为所述STB对应的第二网络二元信息的媒体流报文经由所述NAT发送至所述STB。 A MDU an MDU, located in the second network by a network address translator NAT box STB interaction data with a first network, comprising: a first sending module, configured by signaling the MDU two yuan corresponding second network information to the STB; obtaining module, a second two yuan network NAT information packet from the STB, the STB acquired by a corresponding, wherein the binary information includes: IP address and port information; and a second transmitting module, a second network for two yuan media information and destination address information corresponding to the STB via the NAT stream message sent to the STB.
7.一种网络协定电视IPTV系统,其特征在于包括:网络地址转换器NAT、位于第一网络中的机顶盒STB和位于第二网络中的媒体分发单元MDU,其中: 所述MDU通过所述NAT与所述STB连接,用于通过信令将所述MDU对应的第二网络二元信息发送给所述STB ;通过来自所述STB的NAT报文获取所述STB对应的第二网络二元信息,其中,二元信息包括:IP地址和端口信息;以及将目的地址信息为所述STB对应的第二网络二元信息的媒体流报文经由所述NAT发送至所述STB。 An Internet protocol television (IPTV) system, comprising: a network address translation NAT device, set-top box STB located in the first network and the second network is positioned MDU MDU, wherein: the MDU by the NAT the STB is connected to, for transmitting a second signaling network via the two yuan MDU information corresponding to the STB; two yuan obtaining a second network through the STB information corresponding to the packet from the NAT STB, wherein the binary information includes: IP address and port information; and the second media information, two yuan network destination address information corresponding to the STB via the NAT stream message sent to the STB.
8.根据权利要求7所述的系统,其特征在于, 所述NAT用于接收所述STB发送的源地址信息为所述STB在所述第一网络中的第一网络二元信息的所述NAT报文,转化所述NAT报文的源地址信息为所述STB对应的所述第二网络二元信息,并发送转化后的所述NAT报文至所述MDU,其中,所述MDU通过转化后的所述NAT报文的源地址信息获取所述STB对应的所述第二网络二元信息。 8. The system according to claim 7, characterized in that the NAT address of the STB for receiving the transmitted source information for the first network two yuan the STB of the first network NAT packet, the source address information of NAT conversion packets corresponding to the second network to the STB two yuan information, and transmits the packet after conversion to the MDU NAT, wherein said MDU by after conversion of the NAT packet source address of the STB information acquisition corresponding to two yuan second network information.
9.根据权利要求8所述的系统,其特征在于, 所述MDU还用于根据所述NAT报文中携带的鉴权信息,对所述STB进行鉴权。 9. The system of claim 8, wherein said MDU for further authentication information carried in the packet to the NAT, the STB performs authentication.
10.根据权利要求9所述的系统,其特征在于, 所述MDU还用于在对所述STB的鉴权成功的情况下,发送所述STB对应的第二网络二元信息和用于指示对所述STB的鉴权为成功的鉴权成功响应至主控处理单元MPU ;以及根据所述MPU响应于所述鉴权成功响应的、用于指示将所述STB创建为用户的指示信息,确定发送所述媒体流报文至所述STB,其中,在所述指示信息中指示所述媒体流报文的目的地址信息为所述第二网络二元信息。 10. The system according to claim 9, wherein said MDU further authentication is successful for the case where the STB, the second network transmits information of the STB corresponding to two yuan for indicating STB is the successful authentication the authentication success response to the master processing unit MPU; and the MPU according to a response to the authentication success response for creating the STB indicating the user indication information, determining the transmission of the media stream packet to the STB, wherein, in said indication information indicates that the media stream message to the destination address information of the second network information two yuan.
11.根据权利要求7至10中任一项所述的系统,其特征在于, 所述MDU还用于发送所述媒体流报文至所述NAT ; 所述NAT还用于转化所述媒体流报文的目的地址信息为所述STB在所述第一网络中的第一网络二元信息,并发送转化后的所述媒体流报文至所述STB。 11. The system of any one of claims 7 to 10, wherein said MDU further configured to send the media stream message to the NAT; the NAT for further transforming the media stream destination address information of the packet network to the STB two yuan first information in said first network, and after the media stream message sent to the conversion STB.
CN201310661435.6A 2013-12-09 2013-12-09 Network address translation (NAT) traversal method for media stream message, media distribute unit (MDU) and internet protocol television (IPTV) system CN104703049A (en)

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