vb.net barcode generator Functional Planes in Software

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Functional Planes
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The functional planes represent the broadest level of separation between the functional entities in VoIP network. There are four distinct functional planes employed by the ISC to describe the functioning of an end-to-end VoIP network: Transport, Call Control & Signaling, Service & Application, and Management (see Figure 14-1).
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Figure 14-1 Functional planes for ISC Reference Architecture (Source: ISC)
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Service & Application Plane Management Plane
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Application Signaling (SIP) Application/Feature Servers (SCP, service logic, LDAP servers) IN/AIN
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Open APIs & Protocols (JAIN, Parlay, CAMEL, SIP, AIN/INAP)
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Call Control &
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Signaling Plane
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Call Agents, MGC, Softswitch, GK
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SIP/SIP-T; BICC; H.323
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Inter-Network Switch
Subscriber & Service Provisioning, Network Management, Operational Support, Billing Support
Bearer Signaling Signaling (ISUP, MAP, RANAP, MGCP, H.248, SIP) (MGCP, H.248, SIP)
Transport Plane
Media Server IP Transport Domain: IP Backbone, Routers, Switches, BGs QoS Mechanisms (RSVP, DiffServ, MPLS ), MS (Bearer Portion) Interworking Domain: TG (MG), SG, Interworking Gateway
SS7; TDM/ATM
PSTN/SS7/ ATM Networks
IP Other VoIP Networks
Non-IP Access Domain: Wireline Access (AG, Access Proxies) Mobile Access (RAN AG) Broadband Access (IADs, MTAs)
IP Phones (H.323, SIP, MGCP, ), IP Terminals, IP PBXs
Non-IP Terminals/ Mobile Networks
Available at the ISC s web site at www.softswitch.org/educational/reference.asp.
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Past, Present, and Future of Softswitch
Transport Plane
14
The Transport Plane is responsible for the transport of messages across the VoIP network. These messages may be for call signaling, call and media setup, or media. The underlying transport mechanism(s) for these messages may be based on any technology that satisfies the requirements for carrying these types of traffic. The Transport Plane also provides access for signaling and media with external networks, or terminals to VoIP networks. Often the Transport Plane devices and functions are controlled by functions in the Call Control & Signaling Plane. The Transport Plane is further divided into three domains: IP Transport Domain, Interworking Domain, and Non-IP Access Domain. IP Transport Domain The IP Transport Domain provides the transport backbone and routing/switching fabric for transporting packets across the VoIP network. Devices like routers and switches belong to this domain. Devices that provide Quality of Service (QoS) mechanisms and policies for the transport also belong to this domain. Interworking Domain The devices in the Interworking Domain are primarily responsible for the transformation of signaling or media received from external networks into a form that can be sent among the various entities in the VoIP network and vice versa. It consists of devices like Signaling Gateways (signaling transport conversion between different transport layers), Media Gateways (media conversion between different transport networks and/or different media), and Interworking Gateways (signaling interworking on the same transport layer but with different protocols). Non-IP Access Domain The Non-IP Access Domain applies primarily to non-IP terminals and wireless radio networks that access the VoIP network. It consists of Access Gateways or Residential Gateways for non-IP terminals or phones, ISDN terminals, Integrated Access Devices (IADs) for DSL networks, Cable Modem/Multimedia Terminal Adapters (MTAs) for HFC networks, and Media Gateways for a GSM/3G mobile radio access network (RAN). Note that the IP terminals, like a SIP phone, will directly connect to the IP Transport Domain, without going through an Access Gateway.
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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Past, Present, and Future of Softswitch
Call Control & Signaling Plane
The Call Control & Signaling Plane controls the major elements of the VoIP network, especially in the Transport Plane. The devices and functions in this plane carry out call control based on signaling messages received from the Transport Plane, and handle establishment and teardown of media connections across the VoIP network by controlling components in the Transport Plane. The Call Control & Signaling Plane consists of devices like the Media Gateway Controller (a.k.a. Call Agent or Call Controller), Gatekeepers and LDAP servers.
Service & Application Plane
The Service & Application Plane provides the control, logic and execution of one or more services or applications in a VoIP network. The devices in this plane control the flow of a call based on the service execution logic. They achieve this by communication with devices in the Call Control & Signaling Plane. The Service & Application Plane consists of devices like Application Servers and Feature Servers. The Service & Application Plane may also control specialized bearer components, such as Media Servers, that perform functions like conferencing, IVR, tone processing, and so on.
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