On TCP-based SIP server overload control

Shen, Charles; Schulzrinne, Henning

doi:10.1145/1941530.1941541

Cited by 31 publications

(23 citation statements)

References 50 publications

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“…This is a local method that operates without any knowledge about status of the network. Shen et al introduce an explicit algorithm for window adjustment in [10,20], but its results can be optimized by considering delay and loss properties of the links.…”

Section: Related Workmentioning

confidence: 99%

A load scheduler for SIP proxy servers: design, implementation and evaluation of a history weighted window approach

Montazerolghaem

Shekofteh

Yaghmaee

et al. 2015

Int J Communication

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SUMMARYThe widespread use of Session Initiation Protocol as a signalling protocol has created various challenges. An important one is that its throughput can be severely degraded when an overload happens in the proxy server because of several retransmissions from the user agent. One common approach to overcome this problem is 'load balancing'. A balancer needs to know the status of proxy servers, which are continuously gathered implicitly or explicitly. Implicit methods have averagely less overhead than explicit ones. This paper attempts to prevent throughput reduction by balancing the loads among available proxy servers properly using an implicit mechanism called History Weighted Average Response time. The proposed algorithm is robust because it incurs no extra processing to proxy servers. The novelty of the mechanism is making use of 'response time history' to estimate the load being currently processed on servers. By implementing in a real testbed, throughput and scalability are improved compared with an important state-of-the-art similar algorithm. This improvement stems from no need for modification in SIP protocol, easy implementation and application, simple computations for making decision and no need for extra feedback between servers and load balancer.

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Section: Related Workmentioning

confidence: 99%

A load scheduler for SIP proxy servers: design, implementation and evaluation of a history weighted window approach

Montazerolghaem

Shekofteh

Yaghmaee

et al. 2015

Int J Communication

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show abstract

“…Towards this end, it 3 The computational cost of the control action has to be considered as a component of the disturbance. Hence, the simplicity of the control system is a key design requirement.…”

Section: B the Design Of The Proposed Control Systemmentioning

confidence: 99%

“…Overload may be caused by poor capacity planning, component failures, avalanche restart, flash crowds and denial of service attacks [2]. SIP sessions are usually transported over the UDP protocol [3], which is a best effort transport protocol without congestion control and retransmission of packets. For this reason lost packets are recovered by the SIP by means of a retransmissions mechanism.…”

Section: Introductionmentioning

confidence: 99%

Local SIP Overload Control: Controller Design and Optimization by Extremum Seeking

Cicco

Cofano

Mascolo

2015

IEEE Trans. Control Netw. Syst.

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The Session Initiation Protocol (SIP) is a signaling protocol for managing various types of real time sessions between parties over an Internet Protocol network. An open issue is the control of overload situations that occur when the incoming flow of requests to a SIP server overcomes the server processing capacity. In particular, call establishment times increase due to overload, which triggers retransmissions and causes a further increase of the total incoming flow of requests. This paper proposes an overload control system for regulating both the queue length and the CPU load of the SIP server. The proposed control system is made of two PI controllers tuned by minimizing a proper cost function using the Extremum Seeking algorithm. A real working implementation of the SIP overload controller has been made in the open source SIP server Kamailio. A performance evaluation and comparison of the proposed controller with the main proposals existing in literature has been carried out. Results show that the proposed control system counteracts overload situations and provides a goodput close to the optimal while maintaining low call establishment delays and retransmission ratios.

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“…Paper [1] deals with overload control methods in SIP proxy server and uses OPNET software for measuring throughput. In papers [2] and [3] SIP is practically implemented along with TCP and UDP transmission protocol and OpenSER is used to obtain efficiency results. Articles [4] and [5] mention to window-based distributed method and combination of signal and window-based method, respectively.…”

Section: Related Workmentioning

confidence: 99%

SIP Overload Control Testbed: Design, Building and Evaluation

Montazerolghaem¹,

Yaghmaee²

2013

IJASA

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Having facilities such as being in text form, end-to-end connection establishment, and being independence from the type of transmitted data, SIP protocol is a good choice for signaling protocol in order to set up a connection between two users of an IP network. Although utilization of SIP protocol in a wide range of applications has made various vulnerabilities in this protocol, amongst which overload could make serious problems in SIP servers. A SIP is overloaded when it does not have sufficient resources (majorly CPU processing power and memory) to process all messages. In this paper the window-based overload control mechanism which does not require explicit feedback is developed and implemented on Asterisk open source proxy and evaluated. The results of implementation show that this method could practically maintain throughput in case of overload. As we know this is the only overload control method which is implemented on a real platform without using explicit feedback. The results show that the under load server maintains its throughput at the maximum capacity.

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On TCP-based SIP server overload control

Cited by 31 publications

References 50 publications

A load scheduler for SIP proxy servers: design, implementation and evaluation of a history weighted window approach

A load scheduler for SIP proxy servers: design, implementation and evaluation of a history weighted window approach

Local SIP Overload Control: Controller Design and Optimization by Extremum Seeking

SIP Overload Control Testbed: Design, Building and Evaluation

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