VoIP/SIP/IMS

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In our daily life, economic activities, and national security highly depend on stability, safely, and resilient cyberspace. A network brings communications and transports, power to our homes, run our economy, and provide government with various services.
However it is through the same cyber networks which intrude and attack our privacy, economy, social life in a way which is harmful. Some scholars have interestingly argued that, “in the Internet nobody knows you are a dog”.  This raises some legal issues and concerns.
This paper presents important issues on the Security, Prevention, and Detection of Cyber Crime. The paper consists of four parts in Romanic Numbers.
In Part I, the attempt here is simply to familiarize the reader with a careful understanding of the Cyber Crimes. The author will trace back the meaning, history, and types of Cyber Crimes
In Part II, one has to know the concept of Cyber Security; this will include meaning, background, types if any and important of Cyber Security.
Part III will explain on Cyber Prevention and Detection the same will include meaning and history, Cyber Prevention and Detection Methodologies and Legal Instruments.
And Part IV, Personal Assessment basically in Tanzanian Laws.
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With cybercrime’s yearly revenues estimated at $1 trillion and national security networks probed daily and often breached, cyber security is a vital concern for public and private organizations globally. This research ponders the problem of improving information security by looking at organizations under the lens of Socio-technical systems. The main objective of this study is to ascertain if Net Assessment, one of the principal frameworks for analyzing the United States’ national security strategy, can be used to improve an organization’s capabilities in the field of information and cyber security through its multidisciplinary and holistic approach. To reach this goal, the study identifies and analyzes the aspects Net Assessment offers which are not
included in current information security risk management and assessment methodologies.
The research follows an inductive process, designed using a qualitative approach which makes use of content analysis, comparative analysis and purposive sampling. The first step drafts
a list of current information security risk assessment and risk management methodologies, and then isolates a representative sample. The second step identifies and analyzes existing metaanalytical methods and models devoted to the appraisal, selection, and indexing of risk management and assessment methods. It then defines a categorization framework capable of
accurately capturing the different risk management and assessment method’s functionalities. A third step maps the coverage of the two selected methodologies (NIST and ISO) against the identified functionality categories. After a critical analysis of Net Assessment, and a reasoned estimate of its main differences and capabilities in the context of information security, Net Assessment’s features are mapped in the category list.
The comparison of the features of the three methodologies identifies Net Assessment as a very credible avenue for improving multiple aspects currently neglected by the International
Organization for Standardization (ISO) and National Institute of Standards and Technology (NIST) frameworks. The study results maintain that, if implemented as a companion to these standards, Net Assessment may improve an organization’s security strategy, its allocation of funding for security, provide more accurate estimates of risks and threats, better alignment between potential risks and countermeasures, and improve the inputs for real time and automatic tools.

In this paper we address the problem of generating a candidate role set for an RBAC configuration that enjoys the following two key features: it minimizes the admin-istration cost; and, it is a stable candidate role-set. To achieve these goals, we implement a three steps methodology: first, we associate a weight to roles; second, we identify and remove the user-permission assignments that can not belong to a role having a weight ex-ceeding a given threshold; third, we restrict the problem of finding a candidate role-set for the given system configuration using only the user-permission assignments that have not been removed in step two (that is, user-permission assignments that belong to roles having a weight exceeding the given threshold). We formally show —proof of our results are rooted in graph theory — that this methodol-ogy achieves the intended goals. Finally, we discuss practical applications of our approach to the role mining problem. 1

Resumen El presente trabajo es una implementación de una aplicación para un centro de contacto. Consiste en la distribución de las llamadas entrantes al mismo, en base a parámetros estadísticos obtenidos de los registros de las llamadas realizadas al mismo centro de contacto. La implementación se la realizara mediante Asterisk, una PBX implementada en software y de código abierto. Además se utilizaran programas adicionales como motores de bases de datos, códigos en PHP, servidores web, entre otros. El proyecto busca mejorar la calidad del servicio de un centro de contacto, usando recursos eficientemente. Implementando características diferentes a las que se encuentran disponibles en Asterisk por defecto, con el objetivo de poder brindar servicios a usuarios con privilegios, minimizar tiempo de espera de clientes y dirigir las llamadas a los agentes más idóneos. Palabras Claves: callcenter, VoIP, distribución automática de llamadas, agentes, políticas de redireccionamiento, colas, bases de datos, MySQL, Asterisk. Abstract This paper is an implementation of an application for a callcenter. It consists of the distribution of incoming calls, based on statistical parameters obtained from the details of calls made to the callcenter. The implementation will be using Asterisk software implemented PBX and also open source. Also additional programs were used like database engines, PHP code, and Web servers, among others. The project aims to improve the quality of service of a callcenter, using resources efficiently. Implementing different characteristics from those that are available in Asterisk by default, in order to provide services to privileged users, minimize customer wait time and direct calls to the most appropriate agents.

It is very well collected project on Cloud Computing. no need to wandering on internet to search about Cloud computing, Just download it. thanxx
A very New Technology In I.T. Industry & Very Important for Everyone i.e. For individuals As Well As Big Corporations .Even Very Big Companies like GOOGLE; FACEBOOK; APPLE; AMAZON; MICROSOFT etc. etc. are investing In Cloud Computing... Do Get This Stuff....

In this paper, we aim to perform a SWOT analysis of Voice over Internet Protocol (VoIP) Technology. SWOT analysis is a powerful evaluation framework that is data-driven and fact-based and specifically useful for planning and informed decision making. This study, through a critical evaluation of previous literature, seeks to identify the various positive attributes of VoIP technology as compared to traditional PSTN technology. The study also examines the weaknesses associated with VoIP technology where possible improvements are necessary. The potentials for growth and Threats to VoIP were also discussed in the study.

"Internet Protocol Television (IPTV) has gained an enormous growth rate by revolutionizing personal entertainment. High data rates with increased coverage radius of IEEE 802.11n Wireless Local Area Networks (WLANs) motivate the concept of wireless IPTV. Focusing on wireless IPTV, our work deals with the capacity evaluation of IPTV users over IEEE 802.11n. We first present an upper capacity limit for supporting maximum number of users over IEEE 802.11n. We then propose that 4-times packet size is the optimal frame aggregation size for IPTV which maximizes users capacity and QoS. Moreover, we suggest the use of Datagram Congestion Control Protocol (DCCP) at transport layer for IPTV. We show that DCCP increases capacity upto 35% for IPTV by reducing packet losses at Access Point (AP), compared to User Datagram Protocol (UDP). We further evaluate fairness of IPTV traffic in the presence of Transmission Control Protocol (TCP) traffic in the network. Our study concludes that IPTV using DCCP over IEEE 802.11n not only provides increased user’s capacity but also co-exists fairly with TCP traffic. Transmission of combined IPTV and VoIP over a wireless network is a challenging task. We evaluate capacity of combined IPTV and VoIP over IEEE 802.11n. We then evaluate the use of DCCP at transport layer of IPTV. Our study shows that DCCP(TFRC) can provide 25% additional IPTV users. Our results suggest that performance of DCCP is worst in presence of any other UDP flow because of congestion-less mechanism of UDP. Our fairness analysis with TCP traffic shows that IPTV and VoIP using TFRC provide fair share in bandwidth to TCP with 19% increase in combined capacity. We evaluate optimal parameters of IEEE 802.11n AP for running IPTV and VoIP. We show the optimal values and trends of AP parameters including queue size, transmission opportunity, aggregation and block acknowledgement etc. Our study shows that nearly 9 more VoIP users are supported with a queue size of 70 packets and transmission opportunity of 9. Our study concludes that selection of DCCP and optimized parameters over IEEE 802.11n can enhance capacity of IPTV and VoIP by at-least 19% than use of UDP."

—Denial of Service (DoS) or Distributed Denial of Service (DDoS) is a powerful attack which prevents the system from providing services to its legitimate users. Several approaches exist to filter network-level attacks, but application-level attacks are harder to detect at the firewall. Filtering at application level can be computationally expensive and difficult to scale, while still creating bogus positives that block legitimate users. In this paper, authors show application layer DoS attack for SIP server using some open source DoS attack tools and also suggest a mechanism that can protect a given SIP server from application-level DoS attacks especially the attacks targeting the resources including CPU, sockets, memory of the victim server. In this paper author's attempt to illustrate application layer distributed denial of Service (DDoS) attack on SIP Server such as SIP flooding attack, real time transport (RTP) flooding attack using open source DDoS attack tools. We propose a new DDoS defence mechanism that protects SIP servers from application-level DDoS attacks based on the two methodologies: IPtables and fail2ban detection. The attack flow detection mechanism detects attach flows based on the symptom or stress at the server, since it is getting more difficult to identify bad flows only based on the incoming traffic patterns. A popular software known as Wireshark which is a network protocol analyzer is used to capture the packets during DoS attack from the victim server Ethernet interface to detect the attacking host IP address and analysis the types of attack. We evaluate the performance of the proposed scheme via experiment.

Quizz et notions générales portant sur les réseaux et protocoles TCP UDP, kerberos protocole voieIP Ethernet, Wifi, support de transmissions, Cryptographie , cheval de Troie, ver et virus, attaques web , intrusions, pare-feu
http://www.quizz.biz/quizz-802325.html

“Human behaviour and lifestyle continue to change at a rapid pace, increasing over the past few years fuelled by the introduction of digital media and new technologies which have become embedded in the western culture to the degree that the average person now has a need to be able to understand and relate to them in order to function effectively at work, in the community and within intimate relationships”. Krawford, 2012

CYBER PSYCHOLOGY
Historical technology effects and consequences
Claude Steiner’s view of Psychological effects
Television
Effects on Mental Health
Memory & Brain
Cyber Bullying
Empathy
Internet Addiction
Passive/Active Ratio

CYBER SOCIOLOGY
Historical
Social Movements
Twitter
Walling off the Internet
Organisations
Apple
Power
Facebook
Net Neutrality
Politial control
Free speech
Website attacks
China
Web Filtering
Future of the Internet
Security
Transperancy
Virtual Reality
Nanotechnology
Nano ethics
Debates
Future Plans
Gamification

Il lavoro esposto in questo elaborato si è focalizzato sull’analisi di sicurezza di cinque instant messaging app (Signal, WhatsApp, Telegram, Viber e LINE) ed è frutto dell’attività svolta durante il tirocinio interno all'Università degli Studi di Milano supervisionato dal Prof. Stelvio Cimato. Le applicazioni sono state selezionate secondo questi tre criteri: reputazione e popolarità, registrazione al servizio tramite numero telefonico e pubblicazione di documenti ufficiali sulla crittografia implementata.
Il testo vuole svelare al lettore la capacità degli applicativi di proteggere le proprietà della sicurezza informatica indagandoli da quattro prospettive: il protocollo crittografico implementato, le dichiarazioni sui metadati raccolti, le informazioni estraibili da un’intercettazione passiva e la solidità contro un’intercettazione attiva.

"In today’s information-driven business environment, enterprise systems and processes capture an ever-increasing amount of data. To derive meaningful and actionable information from this data, businesses are compelled to commit significant resources to perform the necessary analysis. While all business areas are impacted to varying degrees, few face a greater challenge than the information security department. To support its mission to protect critical information assets, the information security department must maintain an ongoing process to capture, analyze and subsequently act on log and alert information collected from a wide array of systems across the enterprise.
Typically, these data must be analyzed and actionable.... Joey Hernandez worked as a SME Reviewer for this ISACA effort"

This review focuses on instructional design literature for the MACE project. It shows the plenty of research in instructional design era for more than 20 years, and offers various approaches, concepts and models in this field. The findings relate to the following keywords: Instructional design in teaching, design architecture, and construction engineering. This report is divided in four sections: “Literature Reviews”, “Articles, Book Chapters and Studies”, “Books”, and “Web Resources”, and is organized in a schedular view. Each section implicates the information about literature reference or website title, keywords, abstract and URL/resource if available.

Voice over IP (VoIP), a modern form of telecommunications, requires real-time transmission.  However, there are limitations (e.g., packet loss and delay) which result in degradation in quality of voice transmission over an IP network.  ITU-T, a sector of the International Telecommunication Union, has issued recommendations for VoIP quality based on a Mean Opinion Score (MOS) derived primarily from studies on European languages.  ITU-T has acknowledged that there is an issue related to dependence on language/culture/nationality and the Quality of Experience (QoE) of multimedia, including MOS.  Because ITU-T standards have yet to be adopted for measurement of voice quality for tonal languages (e.g. Thai), the research in this thesis has several aims as follows. First, it is to carry out detailed assessment of subjective voice quality for the standard spoken Thai language and for native Thai speakers in a Thai environment.  Second, to compare voice quality perceived by Thai users of four VoIP codecs, G.729, G.711A-law, G.722 and G.723.1 (at 5.3 kbps). It has been found that Thai users found no significant difference between three of the codecs with a slight preference for G.722 over G.711A-law over G.729 codec. However, they ranked G.723.1 as having significantly poorer voice quality than the others. Therefore G.729 is recommended as the best choice because it has MOS in the range 4.13- 4.18 but requires a lower bandwidth than G.722 or G.711A-law. Third, it is to propose acceptable voice quality standards for VoIP services for Thai language and for native speakers of Thai.  It has been found that, on average, Thai users expected VoIP quality equivalent to a MOS of 3.41, i.e., fair quality. Finally, this thesis proposes two new models for Thai languages and Thai users, namely a Thai subjective-VoIP Quality Evaluation (ThaiVQE) model and an Enhanced E-model  (E2-model), an objective method. The ThaiVQE model focused on two major network parameters, packet loss and packet delay, and a G.711A-law codec. The E2-model was obtained by including a subjective Thai bias factor in a standard E-model.  The results showed that both models gave significant accuracy and reliability improvements compared to the standard E-model, with error reduction more than 20%. Therefore, both of the new models can support voice quality measurement in Thai environments with high accuracy, reliability and confidence.
(Total 169 pages) 

Keywords  :  VoIP, MOS, E-model, packet loss, packet delay, codec, Thai

Depuis les années 1990, Internet a été utilisé afin de diminuer les coûts des communications téléphoniques. Les communications ainsi établies coûtent seulement le prix de deux communications locales (une communication locale à chaque extrémité).

Toutefois, les enjeux de la voix sur IP sont aussi techniques et dépassent la simple idée de la communication téléphonique à moindre coût. Du fait de la convergence voix, données et images, il devient plus facile de gérer un support de transmission unique pour l'ensemble des services (tout sur IP).

This article is an exploration of the recent phenomenon of " lottery scam-ming " in Jamaica. By using black market data to identify targets and presenting as call center employees, scammers subversively manipulate the development apparatuses of information communication technologies and business process outsourcing. The victimization the scam produces creates new circuits of interaction with North Americans that invert long-defined relations of capital between the United States and Jamaica and reconfigures transnational connections of commerce and labor. The article demonstrates how scammers, through criminal manipulations of development , are able to reconcile longer histories and broader circuits of inequality through contemporary gain, producing a novel sense of postcolonial repair. [

"It's a Microcontroller Based DIY Electronics Project. Named Wireless RF Module Using PIC Microcontroller. The RF module is a small electronic circuit used to transmit, receive, or transceive radio waves on one of a number of carrier frequencies. RF modules are widely used in consumer applications such as garage door openers, wireless alarm systems, industrial remote controls, smart sensor applications, weather monitoring system, RFID, wireless mouse technology and wireless home automation systems. They are often used instead of infrared remote controls as they have the advantage of not requiring line-of-sight operation. Thanxx.
"

Tahun Baru 2015 Masehi di bulan januari ini kita mulai mendalami tentang VoIP biar bisa telponan hemat biaya bahkan bisa di bilang bisa gratis.  Kali ini kita coba bahas tentang cara menggunakan VoIP Client contohnya ZoIPer, cek aja di website nya www.zoiper.com

The International Journal of Computer Networks & Communications (IJCNC) is a bi monthly open access peer-reviewed journal that publishes articles which contribute new results in all areas of Computer Networks & Communications.The journal focuses on all technical and practical aspects of Computer Networks & data Communications. The goal of this journal is to bring together researchers and practitioners from academia and industry to focus on advanced networking concepts and establishing new collaborations in these areas.

In this project study of the LTE and its architecture is considered and understand the mechanism of QoS deployment in LTE which introduce the main concept of traffic classification.
A simulation based study is performed in OPNET by deploying a WiMAX network model that performs the same mechanism of QoS in LTE. The simulation considers a simple network topology with three traffic source and destination each of them uses different application the QoS configuration is applied by defining three different classes that are Gold, Silver, Bronze. And the applications used is the HTTP, VoIP, and Video conference. And then the evaluation is performed by comparing the result with QoS and without. And from the simulation result it's obvious that QoS mechanism represent the solution of future needs of networking and communication.