Network Performance- SIP Overload Project

Network Performance- SIP Overload Project - UNIVERSITETI I...

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1 Project : SIP Overload Professor: David Tipper – Network Performance University of Pittsburgh, USA & University of Prishtina -Network Performance Students: Ekrem Fejzullahu, Xhevdet Shala, Artan Grabanica,Mimoza Hema January 2011, Prishtina, Kosovo UNIVERSITETI I PRISHTINËS UNIVERSITAS STUDIORUM PRISHTINIENSIS University of Prishtina Fakulteti i Inxhinierise Elektrike dhe Kompjuterike Faculty of Electrical and Computer Engineering Telecommunication - Master studying
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2 Contents 1. Abstract……………………………………………………………………. ..2 2. Overload Control…………………………………………………………….4 3. Implicit/Explicit Overload Control………………………………………….4 4. Overload Control Model…………………………………………………….5 5. Hop-by-hop overload control………………………………………………. .6 6. End-to-end overload control…………………………………………………6 7. Local Overload Control………………………………………………. .…….7 8. Server-to-Server Communication……………………………………….…. .8 9. Client-to-Server Communication………………………………………. .…. .9 10.Rate-based Overload Control…………………………………………. .……9 11. Loss-based Overload Control………………………………………….…. .10 12. Window-based Overload Control………………………………………….10 13. Signal-based Overload Control………………………………………. .…. .11 14. Message Prioritization………………………………………………. .……11 15. Conclusion……………………………………………………………. .…. .12
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3 1. Abstract As with any network element, a Session Initiation Protocol (SIP) server can suffer from overload when the number of SIP messages it receives exceeds the number of messages it can process. Overload is said to occur when a SIP server does not have sufficient resources to complete the processing of all incoming SIP messages within the required time. These resources can include CPU, memory, network bandwidth, input/output, or disk resources. Overload can pose a serious problem for a network of SIP servers. During periods of overload, a network of SIP servers can be significantly degraded with regard to "goodput" (effective application throughput, not counting the overhead of retransmission and redundant data). In fact, overload may lead to a situation in which the goodput drops down to zero or a small fraction of the original processing capacity. The objective of a SIP overload control mechanism is to enable SIP servers to operate close to their capacity limit during times of overload. The SIP protocol provides a limited mechanism for overload control through its 503
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Network Performance- SIP Overload Project - UNIVERSITETI I...

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