1. Performance over Different Protocols

2. 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?? Computer to ComputerComputer to PhoneSIP to SIPPhone to Phone

3. http://bgnentrepreneur.net/wp-content/uploads//2009/05/voip.jpg

4. 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) Reference APA:

5. 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.)

6. 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 [Cisco’s Proprietary])

7. 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

8.  Terminology  DV – Distance Vector  LS – Link State  Hops – Measure of Distance in IP Based Network  MTU – Maximum Transmission Unit

9. 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.

10. 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.

11. 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)