Voice%20over%20IP%20VoIP

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Voice over IP VoIP

• Performance over Different Protocols

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Introduction Overview of VoIP

• In my words,
• A system to convert analogue signals to digital
  so that telephone calls made over the internet.
• How its possible??

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http//bgnentrepreneur.net/wp-content/uploads//200
9/05/voip.jpg
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The next slides are largely taken from the journal
Reference APA
Che, X.,  Cobley, L.. (2009). VoIP Performance
over Different Interior Gateway
Protocols. International Journal of Communication
Networks and Information Security, 1(1), 34-41. 
Retrieved July 27, 2010, from ProQuest Computing.
(Document ID 1746855051)
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Technical Content (Related to Distributed System)

• Routing is an essential data networking function
  that provides an efficient real-time data
  delivery VoIP requires.
• VoIP as a real-time application brings new
  challenges for service providers and enterprises.
  Networks need to be more intelligent, secure, and
  have a higher level of performance.

• Routing is an essential data networking function
  that provides an efficient real-time data
  delivery VoIP requires.
• The operations of routing protocols rely on two
  sets of information routing tables and
  distribution of knowledge.
• (Routing tables are the mechanism that a router
  uses to locate other networks.)

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Technical Content... Contd.....

• Performance of VoIP can be affected by different
  routing behaviours which include the most widely
  used protocols such as
• RIP (Routing Information Protocol)
• OSPF (Open Shortest Path First)
• EIGRP (Enhanced Interior Gateway Protocol
  Ciscos Proprietary)

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VoIP in Enterprise Networks

• A PBX (Private Branch Exchange) that provides
  VoIP
• The main challenges facing the deployment of VoIP
  in large enterprise networks are the
• Interoperability
• Security
• Bandwidth Management

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• Terminology
• DV Distance Vector
• LS Link State
• Hops Measure of Distance in IP Based Network
• MTU Maximum Transmission Unit

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Performance Evolution

• The VoIP performance metrics include delay,
  jitter, packet loss and Mean Opinion Score (MOS).
• Delay is the time that elapses between when an
  utterance is spoken and when it is played back at
  the receiver.
• Jitter is the variability in the delay which is
  computed as expected arrival time minus actual
  arrival time.

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Conclusion

• VoIP offers great benefits for service providers
  and enterprises, challenges to implement VoIP
  application over enterprise network still remain.
• Routing is an essential data networking function
  that provides an efficient real-time data
  delivery required by VoIP.

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Reference

• Che, X.,  Cobley, L.. (2009). VoIP Performance
  over Different Interior Gateway
  Protocols. International Journal of Communication
  Networks and Information Security, 1(1), 34-41. 
  Retrieved July 27, 2010, from ProQuest Computing.
  (Document ID 1746855051)