network protocols handbook.pdf

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136Protocols GuideVoice Over IP(VOIP) - Signalling0x01060x1070x01080x1090x01100x01110x01120x01130x01140x01150x01160x01170x118Station Close Receive Channel MessageStation Connection Statistics Request MessageStation Soft Key Template Respond MessageStation Soft Key Set Respond MessageStation Select Soft Keys MessageStation Call State MessageStation Display Prompt MessageStation Clear Prompt MessageStation Display Notify MessageStation Clear Notify MessageStation Activate Call Plane MessageStation Deactivate Call Plane MessageStation Unregister Ack MessageRelated protocolsRTP, RTSP, SIP, H.323, Megaco, H.248Sponsor SourceSCCP/Skinny is a Cisco protocol.
137Protocols GuideVoice Over IP(VOIP) - SignallingProtocol NameT.120: Multipoint Data Conferencingand Real Time CommunicationProtocolsProtocol DescriptionThe ITU T.120 standard is made up of a suite of communicationand application protocols. T.120 protocols are designed formultipoint Data Conferencing and real time communication includingmultilayer protocols which considerably enhance multimedia,MCU and codec control capabilities. Depending on thetype of T.120 implementations, the resulting product can makeconnections, transmit and receive data, and collaborate usingcompatible data conferencing features, such as program sharing,whiteboard conferencing, and file transfer. The key functionalitiesof T.120 are:• Establish and maintain conferences without any platformdependence.• Manage multiple participants and programs.• Send and receive data accurately and securely over avariety of supported networking connections.The T.120 protocol suite includes the following protocols:T.121 provides a template for T.120 resource management thatdevelopers should use as a guide for building application protocols.T.121 is mandatory for standardized application protocolsand is highly recommended for non-standard applicationprotocols. The template ensures consistency and reduces thepotential for unforeseen interaction between different protocolimplementations.T.122 defines the multi-point services available to the developer.Together with T.125, it forms MCS, the multi-point “engine” ofthe T.120 conference. MCS relies on T.123 to actually deliverthe data. MCS is a powerful tool that can be used to solve virtuallyany multi-point application design requirement. MCS is anelegant abstraction of a rather complex organism. Learning touse MCS effectively is the key to successfully developing realtimeapplications.T.123 specifies transport profiles for each of the following: 1)Public Switched Telephone Networks (PSTN) 2) IntegratedSwitched Digital Networks (ISDN); 3) Circuit Switched DigitalNetworks (CSDN); 4)Packet Switched Digital Networks (PSDN);5) Novell Netware IPX (via reference profile); and 6) TCP/IP(via reference profile). T.120 applications expect the underlyingtransport to provide reliable delivery of its Protocol Data Units(PDUs) and to segment and sequence that data.T.124 specifies the Generic Conference Control (GCC), whichprovides a comprehensive set of facilities for establishing andmanaging the multi-point conference. It is with GCC that we firstsee features that are specific to the electronic meeting.T.125 describes the Multipoint Communication Service Protocol(MCS). It defines: 1) Procedures for a single protocol for thetransfer of data and control information from one MCS providerto a peer MCS provider; and 2) The structure and encoding ofthe MCS protocol data units used for the transfer of data andcontrol information.T.126 defines a protocol for viewing and annotating still imagestransmitted between two or more applications. This capabilityis often referred to as document conferencing or shared whiteboarding.T.127 specifies a means for applications to transmit files betweenmultiple endpoints in a conference. Files can be transferred toall participants in the conference or to a specified subset of theconference. Multiple file transfer operations may occur simultaneouslyin any given conference and developers can specifypriority levels for the file delivery. Finally, T.127 provides optionsfor compressing files before delivering the data.Protocol StructureThe T.120 architecture relies on a multi-layered approach withdefined protocols and service definitions between layers. Eachlayer presumes the existence of all layers below. The lower levellayers (T.122, T.123, T.124, and T.125) specify an application-independentmechanism for providing multi-point data communicationsservices to any application that can use these facilities.The upper level layers (T.126 and T.127) define protocols forspecific conferencing applications, such as shared whiteboardingand binary file transfer. These “standardized applications”can co-exist in the same conference with “non-standardized”applications such as a business card exchange program or atextual chat application. The following figure represent the architectureof the T.120.
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ITable of ContentsTable of Contents
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2Network Communication Architecture
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12Protocols GuideTCP/IP Protocolspo
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14Protocols GuideTCP/IP - Applicati
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52Protocols GuideTCP/IP - Session L
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54Protocols GuideTCP/IP - Transport
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64Protocols GuideTCP/IP - Network L
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188Protocols GuideWAN - Other WAN P
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196Protocols GuideLAN - Ethernet Pr
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204Protocols GuideLAN - Virtual LAN
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210Protocols GuideLAN - Wilress LAN
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216Protocols GuideLAN - Other Proto
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222Protocols GuideMAN ProtocolsProt
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224Protocols GuideMAN Protocols(0).
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226Protocols GuideStorage Area Netw
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228Protocols GuideSAN ProtocolsProt
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230Protocols GuideSAN ProtocolsThe
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232Protocols GuideSAN Protocols•
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234Protocols GuideSAN ProtocolsSpon
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240Protocols GuideISO Protocols in
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242Protocols GuideISO Protocols - A
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262Protocols GuideISO Protocols - N
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268Protocols GuideCisco ProtocolsPr
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278Protocols GuideCisco Protocolsti
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280Protocols GuideNovell NetWare an
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288Protocols GuideIBM ProtocolsSNAT
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292Protocols GuideIBM ProtocolsSNA
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300Protocols GuideAppleTalk: Apple
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302Protocols GuideDECnet and Protoc
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304Protocols GuideSS7 / C7 Protocol
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318Protocols GuideOther Protocols
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320Protocols GuideOther ProtocolsPr
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324Network Protocols Dictionary: Fr
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342Network Communication Protocols
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