WO2006116920A1 - Système et procédé de communication assurant une interconnexion à travers les domaines ip par le biais d’une passerelle de supports marginale - Google Patents

Système et procédé de communication assurant une interconnexion à travers les domaines ip par le biais d’une passerelle de supports marginale Download PDF

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Publication number
WO2006116920A1
WO2006116920A1 PCT/CN2006/000820 CN2006000820W WO2006116920A1 WO 2006116920 A1 WO2006116920 A1 WO 2006116920A1 CN 2006000820 W CN2006000820 W CN 2006000820W WO 2006116920 A1 WO2006116920 A1 WO 2006116920A1
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WIPO (PCT)
Prior art keywords
media gateway
media
calling
called
edge
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PCT/CN2006/000820
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English (en)
French (fr)
Inventor
Yangbo Lin
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from CN2005100698423A external-priority patent/CN1859339B/zh
Priority claimed from CNB2005100703614A external-priority patent/CN100479442C/zh
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to EP06722411.3A priority Critical patent/EP1804429B1/en
Publication of WO2006116920A1 publication Critical patent/WO2006116920A1/zh
Priority to US11/688,577 priority patent/US8774163B2/en

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Classifications

    • 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
    • H04L65/1023—Media gateways
    • H04L65/1026—Media gateways at the edge
    • 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
    • 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
    • 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
    • H04L65/1104—Session initiation protocol [SIP]

Definitions

  • the present invention relates to network communication technologies, and more particularly to a communication system and method for implementing IP inter-domain interworking through an edge media gateway. Background of the invention
  • FIG. 1 is a schematic diagram of a single network of a next generation network.
  • a Media Gateway Controller (MGC) and a Media Gateway (MG) are two key components in a Next Generation Network (NGN).
  • the MGC is responsible for the call control function.
  • the MG is responsible for the service bearer function to separate the call control plane from the service bearer plane, thereby fully sharing network resources, simplifying equipment upgrades 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.248/MeGaCo and MGCP protocols there are two widely used H.248/MeGaCo and MGCP protocols.
  • a Real-Time Transport Protocol (RTP) media stream is usually established between the MG and the MG for communication.
  • RTP Real-Time Transport Protocol
  • the MG can have two functions depending on the location of the network.
  • One is to carry the media stream in the single IP domain as the user network interface (UNI), also called the ordinary MG, for example, interworking in the same IP network of a single carrier;
  • Network node interface (NNI) carries media streams across IP domains, also known as edge MGs or IP-IP MGs, for example, interworking between different IP networks of different operators, or interworking between different IP networks of a single carrier, typical Such as between the enterprise network and the core network.
  • UNI user network interface
  • NNI Network node interface
  • the main purpose of the present invention is to provide a communication system and method for implementing IP inter-domain interworking through an edge media gateway, which can implement interworking of different IP networks.
  • a communication system for inter-domain interworking of IPs through an edge media gateway includes: an adjacent IP domain, each IP domain includes:
  • a media gateway used for media bearer, and creating a media stream between the user side and the network side under the control of the media gateway controller
  • the edge media gateway is configured to process and forward the media stream of the ordinary MG in the adjacent IP network to implement inter-domain interworking of the IP i or.
  • the edge media gateway is a pair
  • the pair of edge media gateways are respectively located in the adjacent IP domain, and are used for processing and forwarding the media stream of the media gateway in the network and the media stream to the edge media gateway in the adjacent network, and the media gateway in the adjacent network is created based on Media streams enable cross-domain interworking.
  • the edge media gateway is one;
  • the edge media gateway belongs to the network of one of the adjacent IP domains, and is used for processing and forwarding the media stream of the media gateway in the neighboring network.
  • the media gateway in the adjacent network implements inter-domain interworking based on the created media stream.
  • a communication method for implementing inter-domain IP interworking through an edge media gateway includes: When the calling media gateway and the called media gateway that are not in the same IP domain need to communicate, the calling media gateway and the called media gateway respectively perform call connection with the edge media gateway under the control of the media gateway controller of the respective network.
  • the media stream is created; the calling media gateway and the called media gateway pass the edge media gateway to perform cross-domain communication based on the created media stream.
  • the edge media gateway is one.
  • the method specifically includes:
  • the calling media gateway initiates a call request, and the media gateway controller forwards the call request to the called media gateway.
  • the called media gateway accepts a call request, and respectively creates a calling media gateway and an edge media under the control of a media gateway controller, a calling network media gateway controller, and a called network media controller that are responsible for the edge media gateway.
  • the media stream between the gateway and the called media gateway, the called media gateway and the calling media gateway perform cross-domain communication based on the created media stream.
  • the media gateway controller responsible for the edge media gateway is: a media gateway controller of the edge media gateway that spans one of the adjacent IP networks.
  • the media gateway controller responsible for the edge media gateway is a called network media gateway controller
  • the step B specifically includes:
  • the called network media gateway controller instructs the edge media gateway to create a media stream of the edge media gateway to the calling media gateway and the called media gateway respectively;
  • the edge media gateway reports the media stream settings of the calling media gateway and the called media gateway to the called network media gateway controller, and forwards the message to the called network media gateway controller respectively.
  • the calling media gateway and the called media gateway implement cross-domain communication according to the obtained media stream settings of the edge media gateway to the calling media gateway and the called media gateway.
  • the media gateway controller responsible for the edge media gateway is called the network media gateway control Controller
  • the step B specifically includes:
  • the calling network media gateway controller instructs an edge media gateway to create a media stream of the edge media gateway to the calling media gateway and the called media gateway respectively.
  • the edge media gateway reports the media stream settings of the calling media gateway and the called media gateway to the calling network media gateway controller, and forwards the message to the calling network media gateway controller respectively.
  • the calling media gateway and the called media gateway implement cross-domain communication according to the obtained media stream settings of the edge media gateway to the calling media gateway and the called media gateway.
  • the method for creating the media stream of the edge media gateway to the calling media gateway and the called media gateway in step B is as follows:
  • the media gateway controller responsible for the edge media gateway sends the IP domain information of the calling media gateway and the IP domain information of the called media gateway to the edge media gateway.
  • the edge media gateway creates a media stream that is respectively sent to the calling media gateway and a media stream to the media gateway according to the IP domain information of the calling media gateway and the IP domain information of the called media gateway.
  • the edge media gateway includes a calling edge media gateway and a called edge media gateway; the calling edge media gateway and the called edge media gateway are respectively located in the calling network and the called network, and are received by the media gateway of the network to which they belong. Controller control.
  • the method specifically includes:
  • the calling media gateway initiates a call request, and the media gateway controller forwards the call request to the called media gateway;
  • the called media gateway accepts the call request, and under the control of the media gateway controller, respectively creates a media stream between the calling media gateway, the calling edge media gateway, the called edge media gateway, and the called media gateway, called The media gateway and the calling media gateway are based on the created media stream Cross-domain communication.
  • the step b specifically includes:
  • the called edge media gateway creates, under the control of the media gateway controller of the called network, media stream settings of the called edge media gateway to the calling edge media gateway and the called media gateway, respectively, and forwards them to the calling party respectively.
  • the calling edge media gateway establishes a media stream setting of the calling edge media gateway to the called edge media gateway and the calling media gateway under the control of the media gateway controller of the calling network, and forwards the media stream to the called party respectively.
  • the calling media gateway creates a media stream from the calling media gateway to the calling edge media gateway according to the media stream setting of the calling edge media gateway to the calling media gateway; the called media gateway according to the called edge media The media stream setting of the gateway to the called media gateway creates a media stream of the called media gateway to the called edge media gateway;
  • the calling media gateway and the called media gateway according to the media stream of the calling media gateway to the calling edge media gateway, the media stream of the calling edge to the called edge media gateway, and the called media gateway to the called edge
  • the media stream of the media gateway enables cross-domain communication.
  • the step bl specifically includes:
  • the called network media gateway controller sends the IP address information of the calling edge media gateway, the IP domain information of the called media gateway, and the media stream setting of the called media gateway to the called edge media gateway, indicating the called edge
  • the media gateway creates a media stream to the calling edge media gateway and to the called media gateway respectively;
  • the called edge media gateway sets its own media stream to the calling edge media gateway and the called media gateway, and reports it to the called network media gateway controller, and respectively through the called network media gateway controller
  • the edge media gateways are respectively set to the media stream settings of the calling edge media gateway and the called media gateway, and are forwarded to the calling edge media gateway and the called media gateway.
  • the step b2 specifically includes:
  • the calling network media gateway controller sends, to the calling edge media gateway, the IP domain information of the called edge media gateway and the media stream setting of the called edge media gateway, the IP domain information of the calling media gateway, and the calling media. a media stream setting of the gateway, instructing the calling edge media gateway to create a media stream to the called edge media gateway and the calling media gateway respectively;
  • the calling edge media gateway sets its own media stream settings to the called edge media gateway and the calling media gateway, and reports the data to the calling network media gateway controller, and respectively, through the calling network media gateway controller.
  • the media stream setting of the edge media gateway to the called edge media gateway and the calling media gateway is forwarded to the called edge media gateway and the calling media gateway.
  • the step A or the step a specifically includes:
  • the calling media gateway carries the calling media stream setting, the called party information and the calling information of the calling user in the call request, and reports the message to the calling network media gateway controller through the media gateway control protocol;
  • the calling network media gateway controller forwards the received call request to the called network media gateway controller
  • the called network media gateway controller sends the calling information in the call request to the called media gateway through the media gateway control protocol.
  • the present invention enables the calling media gateway and the called media gateway to be controlled by respective media gateway controllers when the calling media gateway and the called media gateway that are not in the same IP domain need to communicate.
  • communication between two different IP networks can be achieved by a single or multiple edge media gateways.
  • 1 is a schematic diagram of networking of a single network of a next generation network
  • FIG. 2 is a schematic diagram of networking of Embodiment 1 of a communication system according to the present invention.
  • FIG. 3 is a flowchart of a communication method of a networking shown in Embodiment 1 of the present invention.
  • Embodiment 4 is a schematic diagram of networking of Embodiment 2 of the communication system of the present invention.
  • FIG. 5 is a flowchart of a communication method of a networking shown in Embodiment 2 of the present invention. Mode for carrying out the invention
  • the core idea of the present invention is: when the calling media gateway and the called media gateway that are not in the same IP domain need to communicate, the calling media gateway and the called media gateway are respectively controlled by their respective media gateway controllers, respectively The media gateway performs call connection and media stream creation; the calling media gateway and the called media gateway pass the edge media gateway to perform cross-domain communication based on the created media stream.
  • FIG. 2 is a schematic diagram of a networking diagram of the first embodiment of the communication system of the present invention.
  • the first embodiment is a schematic diagram of the networking of the IP interworking based on the MGC-MG control mode.
  • the communication system uses two domains IPa, IPb.
  • IPa, IPb may be heterogeneous or homogeneous IP networks, and/or may communicate using different protocols in their respective domains.
  • homogeneity or heterogeneity refers to whether the composition of two adjacent IP domains is the same, for example, whether the same transmission protocol is used, whether the same address is used, whether the same codec type is used, whether the same encryption is used, or Authentication algorithms and so on.
  • MGCa and MGCb are media gateway controllers in the IPa domain and the IPb domain, respectively, which are used to control ordinary MGs of the IPa domain and the IPb domain, respectively.
  • MGi is an edge MG, which is used to process and forward media streams to ordinary MGs in adjacent IP networks, and implements between media gateways in adjacent IP networks. W communication, and protocol conversion between IPa and IPb.
  • MGa and MGb are Goetham MGs, which are used to perform call connection on behalf of the user, and can create a media stream between the user side and the network side under the control of the MGC.
  • a physical gateway can be divided into multiple logical gateways or virtual gateways from a resource perspective, and multiple logical gateways are respectively controlled by multiple MGCs, MGi and MGa and MGb shown in FIG. 2 are logical entities, and That is, the virtual gateway.
  • TDM-RTP time division multiplexing-real time transmission protocol
  • FIG. 3 is a flow chart of a communication method of the networking shown in the first embodiment of the present invention.
  • a user on the MGa in the IPa domain is used as a calling party to initiate a call request to the MGb as a called user.
  • This section describes how to implement IP inter-domain communication through a single edge media gateway. The method includes the following steps:
  • Step 300 The MGa reports the call request of the calling user through the media gateway control protocol, such as H.248, to the MGCa responsible for the MG management in the IPa domain.
  • the media gateway control protocol such as H.248,
  • the call request carries the calling media stream setting, that is, the MGa media stream setting, the called information such as the called number or the called name, and the calling information such as the calling number or the calling name.
  • Step 301 The MGCa analyzes the called information in the call request and finds that the called party is in the IPb domain, and forwards the call request to the MGCb responsible for the MG management in the IPb domain by using a call control protocol such as Session Initiation Protocol (SIP).
  • SIP Session Initiation Protocol
  • Step 302 The MGCb passes the media gateway control protocol, such as H.248, in the call request.
  • the calling information is sent to the MGb.
  • Step 303 If the called user on the MGb accepts the call request of the calling user according to the obtained calling information, the MGb performs setting of the called media stream, that is, the MGb media stream setting, and carries the setting of the called media stream in the call receiving. Reported to MGCb.
  • the called user determines whether to accept the calling party's call request rule according to the calling information such as the calling number or the calling name, etc., and may operate manually or in a preset manner.
  • the manual mode is that after the called user terminal displays or even plays the calling information, the called user decides whether to answer or not.
  • the preset mode is to set the whitelist or the blacklist to directly accept or reject the specific calling party.
  • the call is terminated.
  • Step 304 If the MGI that implements IP interworking is controlled by the MGCb, the MGCb may send, by using a media gateway control protocol, such as H.248, the IP domain information of the calling media gateway and the calling media stream setting, and the called media gateway.
  • the interworking request of the IP domain information and the called media stream is set, and the edge media gateway is instructed to create a media stream to the calling media gateway and the called media gateway respectively;
  • the MGi respectively sets the sum according to the received IP domain information, the calling media stream, and
  • the called media stream is set up to create its own media streams RTPa and RTPb with MGa and MGb respectively.
  • MGi will also set its own media stream RTPa and RTPb settings as MGi media stream settings in the interworking response.
  • MGCb MGCb will send the received interworking responses to MGa (via MGCa forwarding) and MGb respectively.
  • the MGCb forwards the received call admission to the MGCa.
  • the MGCa After obtaining the called media stream setting from the received call admission, the MGCa sends the IP domain to which the calling media gateway belongs.
  • the information and the calling media stream setting, the IP domain information of the called media gateway, and the interworking request set by the called media stream, and the MGi respectively create their own according to the received IP domain information, the calling media stream setting, and the called media stream setting respectively.
  • MGi will bring its own settings for media stream RTPa and RTPb
  • the band returns MGCa in the interworking response; MGCa sends the received interworking responses to MGa and MGb (for forwarding by MGCb).
  • MGi is controlled by MGCa or MGCb is implemented by configuration. In fact, this also determines which IP domain operation the MGi belongs to, and the other IP domain is interoperable by means of the other party's MGi.
  • Step 305 After receiving the settings of the media streams RTPa and RTPb, the MGa and the MGb respectively communicate with the MGi through the media streams RTPa and RTPb.
  • the media stream RTPa and RTPb in the IPa domain and the IPb domain are interconnected by the MGi, and the calling user on the MGa and the called user on the MGb communicate through the MGi.
  • communication between two different IP networks can be realized through a single edge media gateway.
  • the invention can also implement IP inter-domain interworking by using multiple edge media gateways. The following is described by taking two edge MGs as an example.
  • FIG. 4 is a schematic diagram of networking of the second embodiment of the communication system of the present invention. As shown in FIG. 4, FIG. 4 is a schematic diagram of networking in which IP interworking based on the MGC-MG control mode uses multiple edge MG interconnections.
  • the communication system uses two domains IPa, IPb.
  • IPa, IPb may be heterogeneous or homogeneous IP networks, and/or may communicate using different protocols in their respective domains.
  • MGCa and MGCb are the media gateway controllers in the IPa domain and IPb domain, respectively called the calling MGC and the called MGC, which are used to control the MG of the IPa domain and the IPb domain respectively.
  • MGia and MGib are edge MGs, which are respectively called calling edge MG and called edge MG, and are used for processing and forwarding media streams of common media gateways in the network and media streams to edge media gateways in adjacent networks to implement adjacent Communication between the domain media gateways, and protocol conversion between IPa and IPb.
  • MGa and MGb are ordinary MGs, which are used to represent call connections with ⁇ , and can create media streams between the user side and the network side under MGC control.
  • MGia, MGib, MGa, and MGb are logical entities, that is, virtual gateways.
  • FIG. 5 is a flowchart of a communication method of a networking shown in Embodiment 2 of the present invention.
  • IPa is used.
  • the user on the MGA in the domain acts as the calling party and initiates the call request to the MGb as the called user.
  • the method for implementing IP inter-domain communication through a pair of edge media gateways is described in detail. The method includes the following steps:
  • step 500 the MGa reports the call request information of the calling user to the MGCa responsible for the MG management in the IPa domain through the media gateway control protocol, such as H.248.
  • the media gateway control protocol such as H.248.
  • the call request information carries the calling media stream setting, that is, the MGa media stream setting, the called information such as the called number or the called name, and the calling information such as the calling number or the calling name.
  • Step 501 The MGCa analyzes the called information in the call request, and finds that the called party is in the IPb domain, and forwards the call request information to the MGCb responsible for the MG management in the IPb domain by using a call control protocol such as SIP.
  • a call control protocol such as SIP.
  • Step 502 The MGCb sends the calling information in the call request information to the MGb through a media gateway control protocol, such as H.248.
  • a media gateway control protocol such as H.248.
  • Step 503 If the called user on the MGb accepts the call request of the calling user according to the obtained calling information, the MGb performs setting of the called media stream, that is, the MGb media stream setting, and carries the setting of the called media stream in the call receiving. Reported to MGCb.
  • the called user determines whether to accept the calling party's call request rule according to the calling information such as the calling number or the calling name, etc., and may operate manually or in a preset manner.
  • Step 504 The MGCb sends an interworking request carrying the IP domain information of the MGia, the IP domain information of the MGb, and the called media stream setting to the MGib through the media gateway control protocol, such as H.248, instructing the MGib to separately create media to the MGia and the MGb.
  • the media gateway control protocol such as H.248, instructing the MGib to separately create media to the MGia and the MGb.
  • Stream RTPi and RTPb Stream RTPi and RTPb.
  • Step 505 The MGib sends its own settings for the media stream RTPi and RTPb, that is, the MGib media stream settings, to the MGCb in the interworking response.
  • Steps 506 to 507 The MGCb carries the setting of the media stream RTPi of the MGib to the MGia in the interworking response and forwards it to the MGCa.
  • the MGCb carries the setting of the RTPb of the MGib to the MGb in the interworking response and forwards it to the MGb.
  • the media gateway control protocol such as H.248
  • Step 509 The MGia carries the setting of the media stream RTPa and the RTPi, that is, the MGia media stream setting, to the MGCa in the interworking response.
  • Step 510 to step 511 MGCa carries the MGia to MGa media stream RTPa setting and forwards it to the MGa in the interworking response, and the MGCa carries the setting of the MGia to MGib RTPi in the interworking response and forwards it to the MGCb.
  • Step 512 The MGCb carries the setting of the MGia to MGib RTPi in the interworking response and sends it to the MGi.
  • MGa and MGb respectively receive the settings of media stream RTPa and RTPb by MGia and MGib, and communicate with MGia and MGib through media stream RTPa and media stream RTPb respectively, and MGia and MGib receive each other to set media stream RTPi. Then, the media streams RTPa and RTPb in the IPa domain and the IPb domain are interworked through the media stream RTPi, so that the calling user on the MGa and the called user on the MGb can communicate through the MGia and the MGib.
  • communication between two different IP networks can be implemented through a pair of edge media gateways.
  • the present invention can also implement IP inter-domain interworking by using multiple pairs of edge media gateways.
  • the present invention describes the implementation method of the present invention using only two adjacent IP domains, and the present invention is equally applicable to two adjacent IP domains.

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Description

通过边缘媒体网关实现 IP跨域互通的通信系统和方法 技术领域
本发明涉及网络通信技术，尤指一种通过边缘媒体网关实现 IP跨域 互通的通信系统和方法。 发明背景
图 1是下一代网络的单网络的组网示意图， 如图 1所示， 媒体网关 控制器 （MGC )和媒体网关（MG )是下一代网络（NGN ) 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， 以实现 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。
为了使 MG与 MGC协同工作， 在 MGC与 MG之间需要使用媒体网 关控制协议。 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。
在 MGC的控制下， MG与 MG之间通常建立实时传输协议（RTP ) 媒体流进行通信。
MG因所处网络位置不同可以具备两种功能， 一是作为用户网络 接口 （UNI ) 在单 IP域内承载媒体流， 也称普通 MG, 例如在单一运 营商的同一 IP网络内互通； 二是作为网络节点接口 （NNI )跨 IP域承 载媒体流， 也称边缘 MG或 IP-IP MG, 例如在不同运营商的不同 IP网 络之间互通， 或者单一运营商的不同 IP网络之间互通， 典型的如企业 网与核心网之间。 目前只是提出了不同 IP域间的互通需要借助于边缘 MG来实现， 但是没有给出具 ^实现方法。 目前， 存在许多不同的 IP网络， 不同 IP网絡内的媒体流可能具. 有不同的构成机制 , 如 IP网络的 IP地址子网不同、 IPv4与 v6对接、 媒体编解码算法差异等等， 随着业务的发展， 迫切需要使这些不同 IP 网络中的媒体流互通。 发明内容
有鉴于此， 本发明的主要目的在于提供一种通过边缘媒体网关实现 IP跨域互通的通信系统和方法， 可实现不同 IP网的互通。
为达到上述目的， 本发明的技术方案具体是这样实现的：
一种通过边缘媒体网关实现 IP跨域互通的通信系统， 该系统包括： 相邻的 IP域， 每一 IP域包括：
媒体网关控制器， 用于呼叫控制；
媒体网关， 用于媒体承载， 并在媒体网关控制器的控制下创建用户 侧与网络侧之间的媒体流；
边缘媒体网关， 用于处理并转发到相邻 IP网络中普通 MG的媒体 流， 实现所述 IP i或的跨域互通。
所述边缘媒体网关为一对；
所述一对边缘媒体网关分别位于相邻的 IP域中，用于处理并转发到 本网络中媒体网关的媒体流和到邻接网络中边缘媒体网关的媒体流， 相 邻网络中媒体网关基于创建的媒体流实现跨域互通。
所述边缘媒体网关为一个；
所述边缘媒体网关归属于相邻的 IP域其中之一的网络中，用于处理 并转发相邻网络中媒体网关的媒体流， 相邻网络中媒体网关基于创建的 媒体流实现跨域互通。
一种通过边缘媒体网关实现 IP跨域互通的通信方法， 该方法包括： 当不在同一 IP域中的主叫媒体网关与被叫媒体网关需要进行通信 时， 主叫媒体网关与被叫媒体网关在各自网络的媒体网关控制器控制 下， 分别与边缘媒体网关进行呼叫接续和媒体流创建； 主叫媒体网关与 被叫媒体网关间通过边缘媒体网关， 基于创建的媒体流进行跨域通信。
所述边缘媒体网关为一个。
该方法具体包括：
A、 所述主叫媒体网关发起呼叫请求， 并由媒体网关控制器转发呼 叫请求给所述被叫媒体网关；
B、 所述被叫媒体网关接纳呼叫请求， 在负责边缘媒体网关的媒体 网关控制器、 主叫网络媒体网关控制器和被叫网络媒体控制器的控制 下， 分别创建主叫媒体网关、 边缘媒体网关和被叫媒体网关之间的媒体 流， 被叫媒体网关与主叫媒体网关基于创建的媒体流进行通跨域通信。
所述负责边缘媒体网关的媒体网关控制器为： 所述边缘媒体网关所 跨相邻 IP网络其中之一的媒体网关控制器。
所述负责边缘媒体网关的媒体网关控制器为被叫网络媒体网关控 制器；
所述步骤 B具体包括：
Bl l、 所述被叫网络媒体网关控制器指示边缘媒体网关， 创建边缘 媒体网关分别到主叫媒体网关和被叫媒体网关的媒体流；
B12、 所述边缘媒体网关将自身分别到主叫媒体网关和被叫媒体网 关的媒体流设置上报给所述被叫网络媒体网关控制器， 并通过所述被叫 网络媒体网关控制器分别转发给主叫媒体网关和被叫媒体网关；
B 13、 所述主叫媒体网关和被叫媒体网关根据所得到的边缘媒体网 关到主叫媒体网关和被叫媒体网关的媒体流设置实现跨域通信。
所述负责边缘媒体网关的媒体网关控制器为主叫网络媒体网关控 制器；
所述步驟 B具体包括：
B21、 所述主叫网络媒体网关控制器指示边缘媒体网关， 创建边缘 媒体网关分别到主叫媒体网关和被叫媒体网关的媒体流；
B22、 所述边缘媒体网关将自身分别到主叫媒体网关和被叫媒体网 关的媒体流设置上报给所述主叫网络媒体网关控制器， 并通过所述主叫 网絡媒体网关控制器分别转发给主叫媒体网关和被叫媒体网关；
B23、 所述主叫媒体网关和被叫媒体网关根据所得到的边缘媒体网 关到主叫媒体网关和被叫媒体网关的媒体流设置实现跨域通信。
步驟 B中所述创建边缘媒体网关到主叫媒体网关和被叫媒体网关的 媒体流的方法为：
B1、所述负责边缘媒体网关的媒体网关控制器将主叫媒体网关所属 IP域信息和被叫媒体网关所属 IP域信息发给边缘媒体网关；
B2、 所述边缘媒体网关根据主叫媒体网关所属 IP域信息和被叫媒体 网关所属 IP域信息， 创建自身分别到主叫媒体网关的媒体流和到被媒体 网关的媒体流。
所述边缘媒体网关包括主叫边彖媒体网关和被叫边缘媒体网关； 所述主叫边缘媒体网关和被叫边缘媒体网关分别位于主叫网络和 被叫网络中， 受到各自所属网络的媒体网关控制器的控制。
该方法具体包括：
a、所述主叫媒体网关发起呼叫请求，并由媒体网关控制器转发呼叫 请求给所述被叫媒体网关; '
b、 被叫媒体网关接纳呼叫请求， 在媒体网关控制器的控制下， 分 别创建主叫媒体网关、 主叫边缘媒体网关、 被叫边缘媒体网关和被叫媒 体网关之间的媒体流， 被叫媒体网关与主叫媒体网关基于创建的媒体流 进行通跨域通信。
所述步骤 b具体包括：
M、 所述被叫边缘媒体网关在被叫网络的媒体网关控制器控制下， 创建被叫边缘媒体网关分别到主叫边缘媒体网关和被叫媒体网关的媒 体流设置， 并分别转发给主叫边缘媒体网关和被叫媒体网关；
b2、 所述主叫边缘媒体网关在主叫网络的媒体网关控制器控制下， 创建主叫边缘媒体网关分别到被叫边缘媒体网关和主叫媒体网关的媒 体流设置， 并分别转发给被叫边缘媒体网关和主叫媒体网关；
b3、 所述主叫媒体网关根据主叫边缘媒体网关到主叫媒体网关的媒 体流设置， 创建主叫媒体网关到主叫边缘媒体网关的媒体流； 所迷被叫 媒体网关根据被叫边缘媒体网关到被叫媒体网关的媒体流设置， 创建被 叫媒体网关到被叫边缘媒体网关的媒体流；
b4、 所述主叫媒体网关与被叫媒体网关根据主叫媒体网关到主叫边 缘媒体网关的媒体流、 主叫边缘到被叫边缘媒体网关的媒体流， 以及被 叫媒体网关到被叫边缘媒体网关的媒体流， 实现跨域通信。
所述步骤 bl具体包括：
bll、 所述被叫网络媒体网关控制器向被叫边缘媒体网关发送主叫 边缘媒体网关所属 IP域信息、 被叫媒体网关所属 IP域信息和被叫媒体 网关的媒体流设置， 指示被叫边缘媒体网关创建分别到主叫边缘媒体网 关和到被叫媒体网关的媒体流；
Μ2、 所述被叫边缘媒体网关将自身分别到主叫边缘媒体网关和被 叫媒体网关的媒体流设置， 上报给被叫网络媒体网关控制器， 并通过被 叫网络媒体网关控制器分别将被叫边缘媒体网关分别到主叫边缘媒体 网关和被叫媒体网关的媒体流设置， 转发给主叫边缘媒体网关和被叫媒 体网关。 所述步骤 b2具体包括：
b21、 所述主叫网絡媒体网关控制器向主叫边缘媒体网关发送被叫 边缘媒体网关所属 IP域信息和被叫边缘媒体网关的媒体流设置、主叫媒 体网关所属 IP域信息和主叫媒体网关的媒体流设置，指示主叫边缘媒体 网关创建分别到被叫边缘媒体网关和主叫媒体网关的媒体流；
b22、 所述主叫边缘媒体网关将自身分别到被叫边缘媒体网关和主 叫媒体网关的媒体流设置， 上报给主叫网络媒体网关控制器， 并通过主 叫网络媒体网关控制器分别将主叫边缘媒体网关到被叫边缘媒体网关 和主叫媒体网关的媒体流设置， 转发给被叫边缘媒体网关和主叫媒体网 关。
所述步骤 A或步骤 a具体包括：
A1. 所述主叫媒体网关将主叫用户的主叫媒体流设置、 被叫信息和 主叫信息携带在呼叫请求中， 通过媒体网关控制协议上报给主叫网络媒 体网关控制器；
A2. 主叫网络媒体网关控制器将接收到的呼叫请求转发给被叫网 络媒体网关控制器；
A3.被叫网络媒体网关控制器通过媒体网关控制协议， 将呼叫请求 中的主叫信息下发给被叫媒体网关。
由上述技术方案可见， 本发明使得当不在同一 IP域中的主叫媒体网 关与被叫媒体网关需要进行通信时， 主叫媒体网关与被叫媒体网关在各 自的媒体网关控制器控制下， 分别与边缘媒体网关进行呼叫接续和媒体 流创建； 主叫媒体网关与被叫媒体网关间通过边缘媒体网关， 基于创建 的媒体流进行跨域通信。 根据本发明， 可通过单个或多个边缘媒体网关 实现两个不同的 IP网络间的通信。 附图简要说明
图 1是下一代网络的单网络的组网示意图；
图 2是本发明通信系统的实施例一的组网示意图；
图 3是本发明实施例一所示组网的通信方法流程图；
图 4是本发明通信系统的实施例二的组网示意图；
图 5是本发明实施例二所示组网的通信方法流程图。 实施本发明的方式
本发明的核心思想是：当不在同一 IP域中的主叫媒体网关与被叫媒 体网关需要进行通信时， 主叫媒体网关与被叫媒体网关在各自的媒体网 关控制器控制下， 分别与边缘媒体网关进行呼叫接续和媒体流创建； 主 叫媒体网关与被叫媒体网关间通过边缘媒体网关， 基于创建的媒体流进 行跨域通信。
为使本发明的目的、 技术方案及优点更加清楚明白， 以下参照附图 并举较佳实施例， 对本发明进一步详细说明。
图 2是本发明通信系统的实施例一的组网示意图， 如图 2所示， 实施 例一是基于 MGC-MG控制模式的 IP互通采用单个边缘 MG直接跨域的组 网示意图。 该通信系统采用两个网域 IPa、 IPb。 IPa、 IPb可以为异质或同 质的 IP网， 并且 /或者在各自的网域中可能采用不同的协议进行通信。 这 里， 同质或异质指的是两个相邻 IP域的构成是否相同， 例如是否采用相 同的传输协议、是否采用相同的地址构成、是否采用相同的编解码类型、 是否采用相同的加密或鉴权算法等等。
在图 2中， MGCa和 MGCb分别是 IPa域和 IPb域内的媒体网关控制器， 分别用于控制 IPa域和 IPb域的普通 MG。 MGi为边缘 MG, 用于处理并转 发到相邻 IP网络中普通 MG的媒体流，实现相邻 IP网络中媒体网关之间的 W 通信， 并可在 IPa、 IPb两个网域之间进行协议转换。 MGa和 MGb为哥通 MG, 用于代表用户进行呼叫接续， 并可在 MGC控制下创建用户侧与网 络侧之间的媒体流。 因为一个物理网关从资源角度可以被划分为多个逻 辑网关或称虚拟网关， 而多个逻辑网关分别受控于多个 MGC， 所以图 2 中所示 MGi和 MGa、 MGb均为逻辑实体， 也即虚拟网关。
对于作为 UNI的普通 MG而言， 当 MGC指示该普通 MG创建时分复用 -实时传输协议（ TDM-RTP ) 的媒体流时， 通常需要在指示中给出 IP侧 的 RTP媒体编解码算法、 打包时长等参数， 如果已有媒体流对端 RTP地 址和端口等信息， 也可以给出； 然后由该普通 MG选择合适的媒体流本 端 RTP地址和端口等信息。
对于作为 NN1的边缘 MG而言 , 当 MGC指示该边缘 MG创建 RTP-RTP 媒体流时， 除了需要在指示中给出上述针对普通 MG的信息之外， 还需 要给出相应的 IP域信息。 这些信息都将通过媒体网关控制协议来承载。 图 3是本发明实施例一所示组网的通信方法流程图， 结合图 2, 以 IPa域内 的 MGa上的用户作为主叫，发起到 MGb上作为被叫的用户的呼叫请求为 例， 详细介绍通过单个边缘媒体网关实现 IP跨域互通的通信方法， 该方 法包括以下步骤：
步骤 300: MGa将其上主叫用户的呼叫请求通过媒体网关控制协议 如 H.248上报给负责 IPa域内 MG管理的 MGCa。
呼叫请求中携带有主叫媒体流设置即 MGa媒体流设置、 被叫信息如 被叫号码或被叫姓名等， 和主叫信息如主叫号码或主叫姓名等。
步骤 301： MGCa对呼叫请求中的被叫信息进行分析后发现被叫在 IPb域内， 通过呼叫控制协议如会话起始协议 ( SIP ) 向负责 IPb域内 MG 管理的 MGCb转发该呼叫请求。
步骤 302: MGCb通过媒体网关控制协议如 H.248, 将呼叫请求中的 主叫信息下发给 MGb。
步骤 303: 若 MGb上被叫用户根据获得的主叫信息， 接纳该主叫用 户的呼叫请求， MGb进行被叫媒体流设置即 MGb媒体流设置， 并将被叫 媒体流的设置携带在呼叫接纳中上报给 MGCb。
本步驟中， 被叫用户根据主叫信息如主叫号码或主叫姓名等， 决定 是否接纳主叫用户呼叫请求的规则可以采用人工或预置方式操作。 比如 人工方式就是被叫用户终端显示甚至播放主叫信息后， 由被叫用户决定 是否接听， 预置方式就是设置白名单或黑名单对特定主叫直接接纳或拒 绝。
如果 MGb不接纳呼叫请求， 则结束本次呼叫。
步骤 304: 若实现 IP互通的 MGi受控于 MGCb, 则 MGCb可以通过媒 体网关控制协议如 H.248,向 MGi发送携带主叫媒体网关所属 IP域信息和 主叫媒体流设置、 被叫媒体网关所属 IP域信息和被叫媒体流设置的互通 请求， 指示边缘媒体网关创建分别到主叫媒体网关和被叫媒体网关的媒 体流； MGi分别根据接收到的 IP域信息、 主叫媒体流设置和被叫媒体流 设置， 创建自身分别与 MGa和 MGb的媒体流 RTPa和 RTPb。 MGi将自身 对媒体流 RTPa和 RTPb的设置也称为 MGi媒体流设置携带在互通响应中 返回 MGCb; MGCb将接收到的互通响应分别发送给 MGa(经 MGCa转发） 和 MGb。
若实现 IP互通的 MGi受控于 MGCa,则 MGCb将接收到的呼叫接纳转 发给 MGCa, MGCa从接收到的呼叫接纳中获取被叫媒体流设置后， 向 MGi发送携带主叫媒体网关所属 IP域信息和主叫媒体流设置、 被叫媒体 网关所属 IP域信息和被叫媒体流设置的互通请求， MGi分别根据接收到 的 IP域信息、 主叫媒体流设置和被叫媒体流设置创建自身分别与 MGa和 MGb的媒体流 RTPa和 RTPb。 MGi将自身对媒体流 RTPa和 RTPb的设置携 带在互通响应中返回 MGCa； MGCa将接收到的互通响应分别发送给 MGa和 MGb (经 MGCb转发 ) 。
MGi受控于 MGCa还是 MGCb是通过配置来实现，实际上这也决定了 MGi属于哪个 IP域运营， 而另一 IP域是借助对方的 MGi来实现互通的。
步骤 305: MGa和 MGb各自收到 MGi对媒体流 RTPa和 RTPb的设置 后， 分别通过媒体流 RTPa和 RTPb与 MGi进行通信。
至此， 通过 MGi实现了 IPa域内和 IPb域内的媒体流 RTPa和 RTPb互 通， MGa上的主叫用户和 MGb上的被叫用户通过 MGi实现了通信。
才艮据本发明实施例一， 可通过单个边缘媒体网关实现两个不同的 IP 网的通信。本发明也可利用多个边缘媒体网关实现 IP跨域互通。下面以 通过两个边缘 MG为例进行描述。
图 4是本发明通信系统的实施例二的组网示意图， 如图 4所示， 图 4是基于 MGC-MG控制模式的 IP互通采用多个边缘 MG互联跨域的组 网示意图。 该通信系统采用两个网域 IPa、 IPb。 IPa、 IPb可以为异质或 同质的 IP网，并且 /或者在各自的网域中可能采用不同的协议进行通信。
在图 4中， MGCa和 MGCb ^别是 IPa网域和 IPb网域内的媒体网 关控制器， 分别称为主叫 MGC和被叫 MGC, 分别用于控制 IPa网域和 IPb网域的 MG。 MGia和 MGib为边缘 MG, 分别称为主叫边缘 MG和 被叫边缘 MG, 用于处理并转发到本网络中普通媒体网关的媒体流和到 邻接网络中边缘媒体网关的媒体流， 实现相邻网域媒体网关之间的通 信， 并可在 IPa、 IPb两个网域之间进行协议转换。 MGa和 MGb为普通 MG,用于代表用 ^进行呼叫接续， 并可在 MGC控制下创建用户侧和网 络侧之间的媒体流。 图 4中所示 MGia、 MGib和 MGa、 MGb均为逻辑 实体， 也即虚拟网关。
图 5是本发明实施例二所示组网的通信方法流程图， 结合图 4, 以 IPa 域内的 MGa上的用户作为主叫，发起到 MGb上作为被叫的用户呼叫请求 为例， 详细介绍通过一对边缘媒体网关实现 IP跨域互通的通信方法， 该 方法包括以下步骤：
步骤 500, MGa将其上主叫用户的呼叫请求信息通过媒体网关控制 协议如 H.248上报给负责 IPa域内 MG管理的 MGCa。
呼叫请求信息携带有主叫媒体流设置即 MGa媒体流设置、 被叫信息 如被叫号码或被叫姓名等， 和主叫信息如主叫号码或主叫姓名等。
步骤 501 : MGCa对呼叫请求中的被叫信息进行分析后发现被叫在 IPb域内 , 通过呼叫控制协议如 SIP向负责 IPb域内 MG管理的 MGCb转发 该呼叫请求信息。
步驟 502: MGCb通过媒体网关控制协议如 H.248将呼叫请求信息中 的主叫信息下发给 MGb。
步骤 503: 若 MGb上被叫用户根据获得的主叫信息， 接纳该主叫用 户的呼叫请求， MGb进行被叫媒体流设置即 MGb媒体流设置， 并将被叫 媒体流的设置携带在呼叫接纳中上报给 MGCb。
本步驟中， 被叫用户根据主叫信息如主叫号码或主叫姓名等， 决定 是否接纳主叫用户呼叫请求的规则可以采用人工或预置方式操作。
步骤 504: MGCb通过媒体网关控制协议如 H.248, 向 MGib发送携带 有 MGia所属 IP域信息、 MGb所属 IP域信息和被叫媒体流设置的互通请 求， 指示 MGib分别创建到 MGia和 MGb的媒体流 RTPi和 RTPb。
步骤 505: MGib将自身对媒体流 RTPi和 RTPb的设置即 MGib媒体流 设置携带在互通响应中上报给 MGCb。
步骤 506〜步骤 507: MGCb将 MGib到 MGia的媒体流 RTPi的设置携带 在互通响应中转发给 MGCa, MGCb将 MGib到 MGb的 RTPb的设置携带在 互通响应中转发给 MGb。 步骤 508: MGCa通过媒体网关控制协议如 H.248, 向 MGia发送携带 有 MGa所属 IP域信息和主叫媒体流设置、 MGib所属 IP域信息和 MGib媒 体流设置的互通请求， 指示 MGia分别创建到 MGa和 MGib的媒体流 RTPa 和 RTPi。
步骤 509: MGia将自身对媒体流 RTPa和 RTPi的设置即 MGia媒体流 设置携带在互通响应中上报给 MGCa。
步驟 510〜步骤 511： MGCa将 MGia到 MGa的媒体流 RTPa的设置携带 在互通响应中转发给 MGa, MGCa将 MGia到 MGib的 RTPi的设置携带在 互通响应中转发给 MGCb.
步骤 512: MGCb将 MGia到 MGib的 RTPi的设置携带在互通响应中发 送给 MGi
至此， MGa和 MGb各自收到 MGia和 MGib对媒体流 RTPa和 RTPb的 设置后， 分别通过媒体流 RTPa和媒体流 RTPb与 MGia和 MGib进行通信， MGia和 MGib在收到彼此对媒体流 RTPi的设置后，通过媒体流 RTPi使 IPa 域内和 IPb域内的媒体流 RTPa和 RTPb互通， 于是 MGa上的主叫用户和 MGb上的被叫用户可通过 MGia和 MGib进行通信。
根据本发明实施例二， 可通过一对边缘媒体网关实现两个不同的 IP 网的通信。 本发明也可利用多对边缘媒体网关实现 IP跨域互通。
需要说明的是， 本发明仅用两个相邻的 IP域描述了本发明的实现方 法， 本发明同样适用于两两相邻的 IP域。
以上所述， 仅为本发明的较佳实施例而已， 并非用于限定本发明的 保护范围， 凡在本发明的精神 ^原则之内所做的任何修改、 等同替换、 改进等， 均应包含在本发明的保护范围之内。

Claims

权利要求书
1、一种通过边缘媒体网关实现 IP跨域互通的通信系统 ,其特征在于， 该系统包括： 相邻的 IP域， 每一 IP域包括：
媒体网关控制器， 用于呼叫控制；
媒体网关， 用于媒体承载， 并在媒体网关控制器的控制下创建用户 侧与网络侧之间的媒体流；
边缘媒体网关， 用于处理并转发到相邻 IP网络中普通 MG的媒体 流， 实现所述 IP域的跨域互通。
2、 根据权利要求 1 所述的通信系统， 其特征在于， 所述边缘媒体 网关为一对；
所述一对边缘媒体网关分别位于相邻的 IP域中，用于处理并转发到 本网络中媒体网关的媒体流和到邻接网络中边缘媒体网关的媒体流， 相 邻网络中媒体网关基于创建的媒体流实现跨域互通。
3、 根据权利要求 1 所述的方法， 其特征在于， 所述边缘媒体网关 为一个；
所述边缘媒体网关归属于相邻的 IP域其中之一的网络中，用于处理 并转发相邻网络中媒体网关的媒体流， 相邻网络中媒体网关基于创建的 媒体流实现跨域互通。
4、 一种通过边缘媒体网关实现 IP跨域互通的通信方法， 其特征在 于， 该方法包括：
当不在同一 IP域中的主叫媒体网关与被叫媒体网关需要进行通信 时， 主叫媒体网关与被叫媒体网关在各自网络的媒体网关控制器控制 下， 分别与边缘媒体网关进行呼叫接续和媒体流创建； 主叫媒体网关与 被叫媒体网关间'通过边缘媒体网关， 基于创建的媒体流进行跨域通信。
5、 根据杈利要求 4所述的通信方法， 其特征在于， 所述边缘媒体 网关为一个。
6、根据权利要求 5所述的通信方法，其特征在于， 该方法具体包括：
A、 所述主叫媒体网关发起呼叫请求， 并由媒体网关控制器转发呼 叫请求给所述被叫媒体网关；
B、 所述被叫媒体网关接纳呼叫请求， 在负责边缘媒体网关的媒体 网关控制器、 主叫网络媒体网关控制器和被叫网络媒体控制器的控制 下， 分别创建主叫媒体网关、 边缘媒体网关和被叫媒体网关之间的媒体 流， 被叫媒体网关与主叫媒体网关基于创建的媒体流进行通跨域通信。
7、 根据权利要求 6 所述的通信方法， 其特征在于， 所述负责边缘 媒体网关的媒体网关控制器为：所述边缘媒体网关所跨相邻 IP网络其中 之一的媒体网关控制器。
8、 根据权利要求 6 所述的通信方法， 其特征在于， 所述负责边缘 媒体网关的媒体网关控制器为被叫网络媒体网关控制器；
所述步骤 B具体包括：
Bl l、 所述被叫网络媒体网关控制器指示边缘媒体网关， 创建边缘 媒体网关分别到主叫媒体网关和被叫媒体网关的媒体流；
B12、 所述边缘媒体网关将自身分别到主叫媒体网关和被叫媒体网 关的媒体流设置上报给所述被叫网络媒体网关控制器， 并通过所述被叫 网络媒体网关控制器分别转发给主叫媒体网关和被叫媒体网关；
B13、 所述主叫媒体网关和被叫媒体网关根据所得到的边缘媒体网 关到主叫媒体网关和被叫媒体网关的媒体流设置实现跨域通信。
9、 根据权利要求 6所述的通信方法， 其特征在于， 所述负责边缘 媒体网关的媒体网关控.制器为主叫网络媒体网关控制器；
所述步驟 B具体包括： B21、 所述主叫网络媒体网关控制器指示边缘媒体网关， 创建边缘 媒体网关分别到主叫媒体网关和被叫媒体网关的媒体流；
B22、 所述边缘媒体网关将自身分别到主叫媒体网关和被叫媒体网 关的媒体流设置上报给所述主叫网络媒体网关控制器， 并通过所述主叫 网络媒体网关控制器分别转发给主叫媒体网关和被叫媒体网关；
B23、 所述主叫媒体网关和被叫媒体网关根据所得到的边缘媒体网 关到主叫媒体网.关和被叫媒体网关的媒体流设置实现跨域通信。
10、 根据权利要求 6、 8或 9所述的通信方法， 其特征在于， 步骤 B中 所述创建边缘媒体网关到主叫媒体网关和被叫媒体网关的媒体流的方 法为：
B 1、所述负责边缘媒体网关的媒体网关控制器将主叫媒体网关所属 IP域信息和被叫媒体网关所属 IP域信息发给边缘媒体网关；
B2、 所述边缘媒体网关根据主叫媒体网关所属 IP域信息和被叫媒体 网关所属 IP域信息， 创建自身分别到主叫媒体网关的媒体流和到被媒体 网关的媒体流。
11、 根据权利要求 4所述的通信方法， 其特征在于， 所述边缘媒体 网关包括主叫边缘媒体网关和被叫边缘媒体网关；
所述主叫边缘媒体网关和被叫边缘媒体网关分别位于主叫网络和 被叫网络中， 受到各自所属网络的媒体网关控制器的控制。
12、 根据权利要求 11 所述的通信方法， 其特征在于， 该方法具体 包括：
a、所述主叫媒体网关发起呼叫请求，并由媒体网关控制器转发呼叫 请求给所述被叫媒体网关；
b、 被叫媒体网关接纳呼叫请求， 在媒体网关控制器的控制下， 分 別创建主叫媒体网关、 主叫边缘媒体网关、 被叫边缘媒体网关和被叫媒 体网关之间的媒体流， 被叫媒体网关与主叫媒体网关基于创建的媒体流 进行通跨域通信。
13、 根据权利要求 12所述的通信方法， 其特征在于， 所述步骤 b 具体包括：
M、 所述被叫边缘媒体网关在被叫网络的媒体网关控制器控制下， 创建被叫边缘媒体网关分别到主叫边缘媒体网关和被叫媒体网关的媒 体流设置， 并分别转发给主叫边缘媒体网关和被叫媒体网关；
b2、 所述主叫边缘媒体网关在主叫网络的媒体网关控制器控制下， 创建主叫边缘媒体网关分别到被叫边缘媒体网关和主叫媒体网关的媒 体流设置， 并分别转发给被叫边缘媒体网关和主叫媒体网关；
b3、 所述主叫媒体网关根据主叫边缘媒体网关到主叫媒体网关的媒 体流设置， 创建主叫媒体网关到主叫边缘媒体网关的媒体流； 所述被叫 媒体网关^^据被叫边缘媒体网关到被叫媒体网关的媒体流设置， 创建被 叫媒体网关到被叫边缘媒体网关的媒体流；
b4、 所述主叫媒体网关与被叫媒体网关根据主叫媒体网关到主叫边 缘媒体网关的媒体流、 主叫边缘到被叫边缘媒体网关的媒体流， 以及被 叫媒体网关到被叫边缘媒体网关的媒体流， 实现跨域通信。
14、 根据权利要求 13所述的通信方法， 其特征在于， 所述步驟 bl 具体包括：
bll、 所述被叫网络媒体网关控制器向被叫边缘媒体网关发送主叫 边缘媒体网关所属 IP域信息、 被叫媒体网关所属 IP域信息和被叫媒体 网关的媒体流设置， 指示被叫边缘媒体网关创建分别到主叫边缘媒体网 关和到被叫媒体网关的媒体流；
bl2、 所述被叫边缘媒体网关将自身分别到主叫边缘媒体网关和被 叫媒体网关的媒体流设置， 上报给被叫网络媒体网关控制器， 并通过被 叫网络媒体网关控制器分别将被叫边缘媒体网关分别到主叫边缘媒体 网关和被叫媒体网关的媒体流设置， 转发给主叫边缘媒体网关和被叫媒 体网关。
15、 根据权利要求 13所述的通信方法， 其特征在于， 所述步骤 b2 具体包括：
b21、 所述主叫网络媒体网关控制器向主叫边缘媒体网关发送被叫 边缘媒体网关所属 IP域信息和被叫边缘媒体网关的媒体流设置、主叫媒 体网关所属 IP域信息和主叫媒体网关的媒体流设置，指示主叫边缘媒体 网关创建分别到被叫边缘媒体网关和主叫媒体网关的媒体流；
b22、 所述主叫边缘媒体网关将自身分别到被叫边缘媒体网关和主 叫媒体网关的媒体流设置， 上报给主叫网络媒体网关控制器， 并通过主 叫网络媒体网关控制器分别将主叫边缘媒体网关到被叫边缘媒体网关 和主叫媒体网关的媒体流设置， 转发给被叫边缘媒体网关和主叫媒体网 关。
' 16、 根据权利要求 6或 12所述的通信方法， 其特征在于， 所述步 骤 A或步骤 a具体包括：
A1. 所述主叫媒体网关将主叫用户的主叫媒体流设置、 被叫信息和 主叫信息携带在呼叫请求中， 通过媒体网关控制协议上报给主叫网络媒 体网关控制器；
A2. 主叫网络媒体网关控制器将接收到的呼叫请求转发给被叫网 络媒体网关控制器；
A3. 被叫网络媒体网关控制器通过媒体网关控制协议， 将呼叫请求 中的主叫信息下发给被叫媒体网关。
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EP1804429A1 (en) 2007-07-04
EP1804429B1 (en) 2017-07-26

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