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Voice Over IP (VoIP)

Voice Over IP (VoIP). Understanding VoIP. Concepts Components Functionality Protocols Challenges Demo. Why VoIP?. Economy Mobility Local Numbers. VoIP Overview. ATA (analog telephone adapter). Provides Dial tone Provides Ring Signal for incoming calls

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Voice Over IP (VoIP)

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  1. Voice Over IP(VoIP)

  2. Understanding VoIP • Concepts • Components • Functionality • Protocols • Challenges • Demo Boyapati, Roopesh

  3. Why VoIP? • Economy • Mobility • Local Numbers Boyapati, Roopesh

  4. VoIP Overview Boyapati, Roopesh

  5. ATA (analog telephone adapter) • Provides Dial tone • Provides Ring Signal for incoming calls • Analog to Digital conversion (Outgoing calls) • Digital to Analog (Incoming calls) • 2 Types Boyapati, Roopesh

  6. CODEC • Audio Signal Conversion • G.711: 64000/ second • G.729A: 8000/ second Boyapati, Roopesh

  7. Soft Switches • Call Processor • Phone number associated with that end point • End point’s current IP address • Specialized database/ mapping program. Boyapati, Roopesh

  8. Calling Process • Pick Receiver, this sends signal to ATA • ATA checks n/w connectivity and sends dial tone • Dial Phone Number • Phone number sent to VoIP service providers call processor • Soft switch connects both ends • Signal sent to receiver’s ATA to ring Boyapati, Roopesh

  9. Protocols • H.323 • Session Initiation Protocol • RTP • RTCP Boyapati, Roopesh

  10. H323 • Developed by ITU • Uses signaling messages Boyapati, Roopesh

  11. SIP • Defined by RFC 3261 • Application Layer Protocol • Used to initiate, maintain and terminate sessions • Independent of underlying transport protocol Boyapati, Roopesh

  12. RTP • Real Time Transport Protocol • By IETF, 1996 • Works with all signaling protocols • Operates at transport layer • Independent of transport protocols used • Transports real time data Boyapati, Roopesh

  13. RTP (contd.) • Contains incrementing sequence number in each packet • Contains a sync source identifier and a time stamp Boyapati, Roopesh

  14. Real Time Control Protocol • Works hand in hand with RTP • RTP does data delivery while RTCP sends control packets • Ensure QoS to sender • Reports percentage of packet loss and jitter Boyapati, Roopesh

  15. DEMO Boyapati, Roopesh

  16. Challenges • Available bandwidth • Delay/Network Latency • Packet loss • Jitter • Echo • Security • Reliability • Pulse dialing to DTMF translation • Emergency 911 Calls Boyapati, Roopesh

  17. References • http://www.compare-voip.net/articles/voip-adapters.php • http://communication.howstuffworks.com/ip-telephony7.htm • www.protocols.com/pbook/VoIPFamily.htm • http://communication.howstuffworks.com/ip-telephony6.htm • www.wikipedia.org Boyapati, Roopesh

  18. Thank You ! Boyapati, Roopesh

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