The implementation of the Session Initiation Protocol (SIP)-based Voice over Internet Protocol (VoIP) and multimedia over MANET is still a challenging issue. Many routing factors affect the performance of SIP signaling and the voice Quality of Service (QoS). Node mobility in MANET causes dynamic changes to route calculations, topology, hop numbers, and the connectivity status between the corres...

The Session Initiation Protocol (SIP) server overload management has attracted interest since SIP is being widely deployed in the Next Generation Networks (NGN) as a core signaling protocol. Yet all existing SIP overload control work is focused on SIP-over-UDP, despite the fact that TCP is increasingly seen as the more viable choice of SIP transport. This paper answers the following questions: ...

Software implementing open standards like SIP evolves over time, and often during the first years of deployment, products are either immature or do not implement the whole standard but rather only a subset. As a result, messages compliant to the standard are sometimes wrongly rejected and communication fails. In this paper we describe a novel approach called Babel-SIP for increasing the rate of...

We investigate the structural and vibrational properties of Si:P thin films obtained by co-evaporation Si P in ultrahigh vacuum at room temperature followed rapid thermal annealing. The crystallization was Raman spectroscopy. Annealing temperatures larger than 950 °C leads to formation crystalline phases. Density functional theory calculations modes allow us identify orthorhombic SiP. Electron ...

This paper explores the problem of signalling efficiency of the Session Initiation Protocol in a cellular network. We present performance metrics on SIP and compare SIP signalling efficiency with ISDN Q.931. We present recent measurement results on SIP and SigComp performance and conclude that optimisation of SIP beyond SigComp is necessary for cellular access. We suggest an optimisation proces...

The calcyclin binding protein and Siah-1 interacting protein (CacyBP/SIP) protein was shown to play a role in the organization of microtubules. In this work we have examined the neuronal distribution and possible function of CacyBP/SIP in cytoskeletal pathophysiology. We have used brain tissue from Alzheimer's disease (AD) patients and from transgenic mice modeling 2 different pathologies chara...

A SIP server may be overloaded by emergency-induced call volume, “American Idol” style flash crowd effects or denial of service attacks. The SIP server overload problem is interesting especially because the cost of serving and rejecting a SIP session could be in the same neighborhood. For this reason, the built-in SIP overload control mechanism based on generating rejection messages could not p...

Ubiquitous worldwide broadband Internet access as well the coming of age of VoIP technology have made Voice-over-IP an increasingly attractive and useful network application. Currently the “human-readable” Session Initiation Protocol (SIP) which is based on a simple HTTP-like request/response exchange is steadily gaining headway against the considerably more complex ASN.1 encoded H.323 Multimed...