Tài liệu Voice over IP Open-Source Platforms and the Session Initiation Protocol pptx

... reserved.Page 11 Voice over IP Open-Source Platforms and the Session Initiation Protocol 1-800-COURSESwww.globalknowledge.comExpert Reference Series of White PapersIntroduction Voice over IP (VoIP) communications ... before the steady improvement of these software plat-forms will threaten the equipment vendor’s market share of large businesses. The Impact of Voice over IP (VoIP) in TelecomVoIP: the Early ... experience.Donald Hill, Global Knowledge Course Developer and Instructor Voice over IP Open-Source Platforms and the Session Initiation Protocol Copyright ©2006 Global Knowledge Training LLC....

... identifier):identifies the virtual channel between ATM switch nodesVoIP (Voice over Internet Protocol) : routing of voice conversations over the Internet or through anyother IP- based network; also ... BRI)Process and application layer: Part of the TCP /IP model that performs the same functions as the applica-tion, presentation, and session layers of the OSI modelProcessor:brain of the computer ... equipment used forrouting T1 lines; can cross-connect any T1 line in the system with any other T1 line in the systemData: information manipulated inside the computer in the form of bits and...

... respectively • the tiering of the public Internet, in which users will be required to pay for the specific service levels they require On the other hand, FAXoIP products and services via the public ... software; the server configures the private branch exchange (PBX) to digitize the upcoming call. User A then dials the number of the London office, and the gateway server transmits the (digitized, IP packetized) ... Internet and corporate Intranet, first through FAXoIP gateways and then via IP capable fax machines. Standards for IP based fax transmission will be in place by the end of this year. Throughout the...

... respectively • the tiering of the public Internet, in which users will be required to pay for the specific service levels they require On the other hand, FAXoIP products and services via the public ... software; the server configures the private branch exchange (PBX) to digitize the upcoming call. User A then dials the number of the London office, and the gateway server transmits the (digitized, IP packetized) ... Internet and corporate Intranet, first through FAXoIP gateways and then via IP capable fax machines. Standards for IP based fax transmission will be in place by the end of this year. Throughout the...

... with the null session vulnerability that violates the confidentiality of the system.1 - 19Defense in Depth - SANS ©200119Null Session net use \\172.20.244.164\IPC$ “” /USER:”” The null session ... can think of these as the “primary colors” of information assurance. By mixing and matching these and we do mix and match, because they are interrelated we are able to develop either a very ... on Friday, others over the weekend, and of course still others found out Monday morning, so that March 29 was indeed a challenging day. By late Friday, an excellent description of the virus,...

... 1700, 2500 and 2600 routers, or a combination. Refer to the chart at the end of the lab to correctly identify the interface identifiers to be used based on the equipment in the lab. The configuration ... on the remote router a. Enter show interface at the router prompt. b. List the interfaces, their IP address and subnet masks: Interface IP Address Subnet mask Step 6 Display the protocols ... router. If the ping is not successful, return to step one and troubleshoot the configuration. Step 3 Use help with the telnet command a. Enter telnet ? at either the user exec or the privileged...

... nameSpecifies the language used in this element src = urlURL for the location of the script filetype = encodingSpecifies the MIME type of the scriptcite = urlSpecifies the URL for the content of the ... usage. Then the tables on the left show the possible values the property can take,along with the first versions of IE, Netscape, and Firefox to support these properties. The table on the right ... the URL of the objectcodebase = urlSpecifies the URL of the code required to run the objectcodetype = MIME-typeSpecifies the MIME type of the code basedata = urlSpecifies the data for the...

... 1-15, Firefox gives the <abbr> and <acronym> elements a dashed-underline, and when you hover your mouse over the word, the value of the title attribute shows as a tooltip. InternetExplorer ... represents the year.❑MM represents the month.❑DD represents the day of the month.❑T is just a separator between the date and time.❑hh is the hour.❑mm is the number of minutes.❑ss is the ... note that this makes the gap between the first line and the second line oftext larger than the gap between the second and third lines of text (as the superscript letters poke above43Chapter 1:...

... respondents howthey perceived the programme and its pros and cons, which the success factors are, if and whythey have succeeded, their view on the nature ofknowledge, the way they manage the system ... later in the overallcomparison between empirical findings and theory.Local perceptions The way that local managers and workers viewed the programme, in terms of their associations and the extent ... margin. The planthas not done too many changes over the years—corporate ideas and ventures are taken in slowly. The workforce as well as the management teamhas been very stable over the years. Their...

... RelationshipbetweentheContinuousandDiscreteTimeSpectraBecauseDTsignalsoftenoriginatebysamplingCTsignals,itisimportanttodeveloptherelationshipbetweentheoriginalspectrumoftheCTsignalandthespectrumoftheDTsignalthatresults.First,c1999byCRCPressLLCtheCTFTisappliedtotheCTsamplingmodel,andthepropertieslistedaboveareusedtoproducethefollowingresult:F{sa(t)}=Fs(t)∞n=−∞δ(t−nT)= ... (1.17b)whereCisacounterclockwisecontourofintegrationwhichisaclosedpathcompletelycontainedwithintheregionofconvergenceofS(z).RecallthattheDTFTwasobtainedbytakingtheCTFouriertransformoftheCTsamplingmodelrepresentedbysa(t).Similarly,thebilateralz-transformresultsbytakingthebilateralLaplacetransformofsa(t).Ifthelowerlimitonthesummationof(1.17a)istakentoben=0,then(1.17a )and( 1.17b)becometheone-sidedz-transform,whichistheDTequivalentoftheone-sidedLTforCTsignals.ThehierarchicalrelationshipamongthesevariousconceptsforDTsystemsisdiscussedlaterinthischapter,whereitwillbeshownthatthefamilystructureoftheDTfamilytreeisidenticaltothatoftheCTfamily.ForeveryCTtransformintheCTworldthereisananalogousDTtransformintheDTworld,andviceversa.c1999byCRCPressLLCTABLE1.3 ... (1.19b)whereω=ωTisthenormalizedDTfrequencyaxisexpressedinradians.NotethatS(ejωT)=S(ejω)consistsofaninfinitenumberofreplicasoftheCTspectrumS(jω),positionedatintervalsof(2π/T)ontheωaxis(oratintervalsof2πontheωaxis),asillustratedinFig.1.8.NotethatifS(jω)isbandlimitedwithabandwidthωc,andifTischosensufficientlysmallsothatωs>2ωc,thentheDTspectrumisacopyofS(jω)(scaledby1/T)inthebaseband.Thelimitingcaseofωs=2ωciscalledtheNyquistsamplingfrequency.WheneveraCTsignalissampledatorabovetheNyquistrate,noaliasingdistortionoccurs(i.e.,thebasebandspectrumdoesnotoverlapwiththehigher-orderreplicas)andtheCTsignalcanbeexactlyrecoveredfromitssamplesbyextractingthebasebandspectrumofS(ejω)withanideallow-passfilterthatrecoverstheoriginalCTspectrumbyremovingallspectralreplicasoutsidethebasebandandscalingthebasebandbyafactorofT.1.5...