network protocols handbook.pdf

58Protocols GuideTCP/IP - Transport Layer ProtocolsProtocol NameTALI: Tekelec’s TransportAdapter Layer InterfaceProtocol DescriptionTALI is the interface of a Signalling Gateway, which provides interworkingbetween the Switched Circuit Network (SCN) and anIP network. Since the Gateway is the central point of signallinginformation, not only does it provide transportation of signallingfrom one network to another, but can also provide additionalfunctions such as protocol translation, security screening, routinginformation, and seamless access to Intelligent Network (IN)services on both networks.The Transport Adapter Layer Interface (TALI) protocol providesTCAP, ISUP, and MTP messaging over TCP/IP and is used tosupport reliable communication between the SS7 SignallingNetwork and applications residing within the IP network.This version of TALI provides 3 SS7 signalling transport methodsand provides functionality for MTP over TCP/IP, SCCP/TCAPover TCP/IP and ISUP over TCP/IP.Protocol StructureThe basic TFTP header structure:LengthThe length of the frame. Non-zero if message contains aService or Monitor Socket message.Service message dataThe service message data.Related protocolsTCAP, ISUP, SCCP, TCP, IP, MTP, SS7Sponsor SourceTALI is defined by IETF (http://www.ietf.org) in RFC 3094.Referencehttp://www.javvin.com/protocol/rfc3094.pdfTekelec’s Transport Adapter Layer InterfaceLength16 32bitSYNCOpCodeService message dataSYNCFour bytes must be (54 41 4C 49) TALI in ASCII.OpCodeOperation code are specified as follows:Type of frameTest Service on this Socket testAllow Service messages on this socket alloProhibit Service messages on this socket prohProhibit Service messages Ack proaMonitor Socket message on this socket moniMonitor Socket message Ack monaSCCP Service message sccpISUP Service message isotMTP3 Service message mtp3MTP Primitives mtppSCCP Primitives scppRouting Key Registration rkrgRouting Key De-Registration rkdrSpecial Service Message spcl