Tom Behrens Adam Muniz. Overview What is VoIP SIP Sessions H.323 Examples Problems.
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Transcript of Tom Behrens Adam Muniz. Overview What is VoIP SIP Sessions H.323 Examples Problems.
![Page 1: Tom Behrens Adam Muniz. Overview What is VoIP SIP Sessions H.323 Examples Problems.](https://reader035.fdocuments.net/reader035/viewer/2022081512/56649c895503460f9494199e/html5/thumbnails/1.jpg)
Tom BehrensAdam Muniz
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OverviewWhat is VoIPSIPSessionsH.323ExamplesProblems
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What is VoIPVoice Over IPInternet as Telephone
NetworkConverts Analog
Audio to Digital AudioEliminates Circuit
Switched NetworkCommunicates over
Packet-Switched Internet
SIP & H.323 Protocols
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SIP – Session Initiation ProtocolDesigned by IETFApplication LayerEstablished, Manages, and Terminates a
Multimedia SessionTwo-Party, Multiparty, Multicast SessionsIndependent of the Transport Layer
Runs on UDP, TCP, or SCTPSIP Messages
INVITE, ACK, BYE, OPTIONS, CANCEL, & REGISTER
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SIP Addressessip:addressTelephoneEmailIP
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Simple Session using SIPEstablishing a Connection
Three-Way HandshakeINVITE, Reply Message, ACK
CommunicatingUse Two Temporary Ports
Terminating a ConnectionBYE
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Simple Session using SIP
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Tracking the CalleeCallee is at a Different LocationRegistrar Server knows Callee Location
Email AddressINVITE -> Proxy ServerProxy Server Sends INVITE to Callee
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Tracking the Callee
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H.323Allows Telephones on the Public Telephone
Network to talk to ComputersGateway
Connects the Internet to the Telephone Network
Translates MessagesGatekeeper
Registrar Server on a LAN
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H.323
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H.323 OperationTerminal sends a broadcast message to the
GatekeeperGatekeeper responds with its IP addressTerminal and Gatekeeper negotiate bandwidthTerminal, Gatekeeper, Gateway, and
Telephone negotiate compression methodTerminal, Gatekeeper, Gateway, and
Telephone exchange audioTerminal, Gatekeeper, Gateway, and
Telephone terminate communication
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H.323 Operation
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ExamplesSkypeVonageCisco Systems Telephones
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ProblemsNo Power or No Internet, No PhonePoor Internet connection leads to a poor
phone connectionSecurity Threats
Identity/Service TheftViruses, malware, spamming, and phishing
attacks