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VoIP

VoIP. Tom Behrens Adam Muniz. Overview. What is VoIP SIP Sessions H.323 Examples Problems. What is VoIP. Voice Over IP Internet as Telephone Network Converts Analog Audio to Digital Audio Eliminates Circuit Switched Network Communicates over Packet-Switched Internet

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VoIP

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  1. VoIP Tom Behrens Adam Muniz

  2. Overview • What is VoIP • SIP • Sessions • H.323 • Examples • Problems

  3. What is VoIP • Voice Over IP • Internet as Telephone Network • Converts Analog Audio to Digital Audio • Eliminates Circuit Switched Network • Communicates over Packet-Switched Internet • SIP & H.323 Protocols

  4. SIP – Session Initiation Protocol • Designed by IETF • Application Layer • Established, Manages, and Terminates a Multimedia Session • Two-Party, Multiparty, Multicast Sessions • Independent of the Transport Layer • Runs on UDP, TCP, or SCTP • SIP Messages • INVITE, ACK, BYE, OPTIONS, CANCEL, & REGISTER

  5. SIP Addresses • sip:address • Telephone • Email • IP

  6. Simple Session using SIP • Establishing a Connection • Three-Way Handshake • INVITE, Reply Message, ACK • Communicating • Use Two Temporary Ports • Terminating a Connection • BYE

  7. Simple Session using SIP

  8. Tracking the Callee • Callee is at a Different Location • Registrar Server knows Callee Location • Email Address • INVITE -> Proxy Server • Proxy Server Sends INVITE to Callee

  9. Tracking the Callee

  10. H.323 • Allows Telephones on the Public Telephone Network to talk to Computers • Gateway • Connects the Internet to the Telephone Network • Translates Messages • Gatekeeper • Registrar Server on a LAN

  11. H.323

  12. H.323 Operation • Terminal sends a broadcast message to the Gatekeeper • Gatekeeper responds with its IP address • Terminal and Gatekeeper negotiate bandwidth • Terminal, Gatekeeper, Gateway, and Telephone negotiate compression method • Terminal, Gatekeeper, Gateway, and Telephone exchange audio • Terminal, Gatekeeper, Gateway, and Telephone terminate communication

  13. H.323 Operation

  14. Examples • Skype • Vonage • Cisco Systems Telephones

  15. Problems • No Power or No Internet, No Phone • Poor Internet connection leads to a poor phone connection • Security Threats • Identity/Service Theft • Viruses, malware, spamming, and phishing attacks

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