【整理】什么是IBCF CBGF SBC

• interconnection相关
• II-NNI=Inter-IMS-NNI
• IBCF=Interconnection Border Control Function

• I-CSCF=Interrogating-CSCF=询问-CSCF
• 概述
• 是另一个位于管理域边缘的功能组
• 它的IP地址通过DNS发布，所以远程服务器可以查找到它，并把它作为向它所在的域传递SIP包的跳点
• 功能
• 它查询HSS，获取S-CSCF的地址并且分派给用户以完成SIP注册。
• 它也为S-CSCF传递SIP请求和回应
• 直到IMS第6版，它是可以用来把内网隐藏起来，使外部网络无法获取内部网络的信息（加密部分SIP信息）。这里称之为THIG
• THIG=Topology Hiding Inter-network Gateway=隐藏内部网络拓扑网关
• 从第7版开始，这个功能从I-CSCF移走，作为IBCF的一部分。IBCF被用作外部网络的网关，提供NAT和防火墙功能。IBCF实际上是NNI的会谈边界控制器的裁剪版本。
• IBCF=Interconnection Border Control Function=互联边界控制功能组

• 名词
• IR=Information Retrieval
• CF=Collaborative Filtering
• CBF=Content-Based Filtering
• RAVEL=Roaming Architecture for Voice over LTE with Local Breakout
• LBO=Local Brakeout
• TRF=Transit and Roaming Function
• IBCF=Interconnection Border Control Function
• SBG=Session Border Gateway
• SCTP=Stream Control Transport Protocol
• SGC=Session Gateway Controller
• SME=Small Medium Enterprise
• BGF=Border Gateway Function
• C-BGF=CBGF=Core – Border Gateway Function
• 是什么：一种访问网关access gateway
• 位置：介于某种访问网络access network和IMS核心网络（core network）之间
• I-BGF=IBGF=Interconnection Border Gateway Function
• 是什么：NNI的其中一种
• 位置：介于core(可信的）和 外部网络
• SBC=Session Border Controller=会话边界控制器
• 是什么：一个 控制器=网络节点=网络元素
• 位置：
• 位于IMS系统中
• 介于2个网络之间的
• 作用：控制所有的数据传输
• 包括
• 信号signalling
• （媒体）数据media
• 协议
• https://tools.ietf.org/html/rfc5853
• 用于解决各种问题
• 多种（访问 接入）网络multiple access networks
• IPv4/IPv6
• SIP normalization
• VPNs
• 安全问题security issues
• DOS attacks
• topology hiding
• 加密
• 信号：TLS和IPSec
• 媒体数据：SRTP
• legislative issues=Regulatory=管制
• emergency calls
• legal intercept
• interworking
• 媒体相关问题media related problems
• QoS
• transcoding
• media security
• 实际作用
• 最早：作为NAT
• SBC as a NAT
• 
• 具体例子
• VoLTE Call – Data Path
• 
• 现状
• 各种类型SBC
• A-SBC
• I-SBC
• ICS-SBC
• Enterprise SBC
• Trunking SBC
• WebRTC GW
• 功能重叠或独立
• 某些功能可以独立出其他模块
• 比如
• P-CSCF
• E-CSCF
• 最新：把SBC理解为负责 安全 和 连接 方面的功能
• 其他一些也可以被视为SBC的
• CBGF
• E-CSCF
• ATCF
• ATGW
• EATF
• WebRTC GW
• ICE
• 从IMS角度
• 2种类型SBC
• 包含
• A-SBC=Access-SBC
• 架构
• 
• 相关内容=对应功能
• P-CSCF=Proxy Call Session Control Function
• IMS-ALG=IMS Application Level Gateway
• IMS-AGW=IMS Access Gateway
• I-SBC=Interconnecting-SBC
• 相关内容=对应功能
• IBCF=Interconnection Border Control Function
• TrGW=Translation Gateway
• THIG=Topology Hiding Interwork Gateway
• IWF
• 对比
• A-SBC and I-SBC
• 
• 稍微复杂点的情况
• Call Forwarding and LI and Interconnect
• 
• 漫游往往涉及到SBC
• 可能方案1
• 
• 可能方案2
• 
• 可能方案3
• 
• LBO-VR with  OMR
• 
• LBO-HR
• 
• 其他相关架构
• Logical Position of D-SBC and SmartEdge BGF in IMS or Other Multimedia Networks
• 
• IMS Protocol Stack协议栈
• 
• Transport level interworking – Protocol Stack
• 
• Service level interworking – Protocol Stack
• 
• IMS架构
• 
• 
• IMS architecture for SBC
• 
• UNI
• 
• NNI
• 
• Reference Points
• 
• IMS架构
• 架构图
• 
• 核心元素和简介
• AS=Application Server
• Executes service logic associated with value-added services
• Provides enhanced and intelligent services to subscribers
• CSCF=Call Session Control Function
• P-CSCF=Proxy CSCF
• is the first point of contact and the control point for the User Equipment (UE) within the Service Provider network. It forwards session requests from the UE to the S-CSCF
• S-CSCF=Serving CSCF
• has access to the user subscription data and actually handles the session request
• I-CSCF=Interrogating CSCF
• is the first contact point within a Service Provider network for all incoming session requests from another Service Provider
• BGCF=Breakout Gateway Control Function
• Identifies the network that will be used for connecting IP sessions to the PSTN
• HSS=Home Subscriber Server
• Stores all the static and dynamic information for a subscriber
• Maintains a list of features and services associated with a user, and also the location and means of access to the user
• Provides user profile information
• SLF=Subscription Locator Function
• Queried during Registration and Session Setup to get the name of the HSS containing the required subscriber specific data
• MGCF=Media Gateway Control Function
• Controls the parts of the call state that pertain to connection control for media channels in a T-MGF MGW
• Selects the CSCF depending on the routing number for incoming calls from legacy networks
• Performs protocol conversion between ISUP and call control protocols (e.g., SIP) and maintains call states
• MRFC=Multimedia Resource Function Controller
• Controls the media stream resources in the MRFP under direction from an S-CSCF or Application Server
• Interprets information coming from an AS or S-CSCF (e.g., session identifier) and controls MRFP accordingly
• MRFP=Multimedia Resource Function Processor
• Provides media resources under the direction of MRFC
• May generate media streams (e.g., multimedia announcements), mix incoming media streams for multiple parties, or process media streams (e.g., audio trans-coding, media analysis)
• PDF=Policy Decision Function
• 简介：Provides management of network QoS resources, authorization of resource allocations, and makes policy decisions with regard to use of network QoS resources
• SPDF=Service Policy Decision Function
• T-MGF=Trunk Media Gateway Function
• Terminates bearer channels from a switched circuit network and media streams from a packet network (e.g., RTP streams in an IP network)
• Establishes and releases connections between these channels under control of the MGCF in support of calls between PSTN and IP network
• SGF=Signaling Gateway Function
• Acts as a gateway between the IP call/session control signaling and the SS7-based PSTN signaling
• May provide signaling translation, for example between SIP and SS7 or simply signaling transport conversion e.g., SS7 over IP to SS7 over TDM
• A-BGF=AccessBorderGatewayFunction
• Packet gateway between an access network and a core network used to mask a service provider’s network from access networks, through which UE accessing packet-based services (e.g., IMS, Internet)
• Functions may include Opening and closing gate, Traffic classification and marking, Traffic policing and shaping, Network address and port translation, and Usage information
• Under control of the PDF
• I-BGF=Interconnection Border Gateway Function
• Packet gateway used to interconnect a service provider’s core network with another service provider’s core network supporting the packet-based services
• Functions may be the same as that of the A-BGF
• I-BCF=Interconnection Border Control Function
• Controls I-BGF to interwork with other packet-based networks
• May support the following functions (not limited to)
• Inter-domain protocol normalization and/or repair
• Inter-domain protocol interworking
• Interaction with PDF for resource reservation, resource allocation, and/or other resource related information
• MRB=Media Resource Broker
• Assigns specific media server resources to incoming calls at the request of service applications (i.e., an AS)
• Acquires knowledge of media server resources utilization and reservation requests that it can use to help decide which media server resources to assign to resource requests from applications
• Employs methods/algorithms to determine media server resource assignment

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