Identification of Peer-To-Peer Voip Sessions Using Entropy and Codec
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Master's Thesis Electronic Gatekeeper Using ETHERNET
University of West Bohemia Faculty of Applied Sciences Department of Computer Science and Engineering Master’s thesis Electronic Gatekeeper using ETHERNET Plzeň 2019 Hamza Elghoul Místo této strany bude zadání práce. Declaration I hereby declare that this master’s thesis is completely my own work and that I used only the cited sources. Plzeň, 2 May 2018 Hamza Elghoul Abstract The aim of this thesis is the analysis and the realization of a budget 2-way communication system using ETHERNET connection, more specific- ally a door intercom station (hereinafter ”Bouncer” or "Gatekeeper"), where it is possible to make voice calls between two CLIENTS, a CALLER and a CALLEE with an acceptable to minimal delay. There are many alternative methods available for implementing such sys- tems, this project will try to compare some of these solutions and choose the most convenient platform according to a number of factors, such as band- width, processing power needed and communication protocols in question. Keywords: VoIP, SIP,SDP, server, client, LAN, ethernet, embedded, audio, raspberry pi Contents Page List of Figures7 1 Preface 10 2 Analysis 11 2.1 Objectives and Requirements................. 11 2.2 Hardware............................ 12 2.2.1 Arduino......................... 12 2.2.2 RaspberryPi 3 Model B................ 13 2.2.3 Banana Pi........................ 14 2.2.4 Orange Pi........................ 15 2.2.5 CubieBoard 2...................... 16 2.2.6 Beagle Bone Black................... 16 2.3 Application........................... 18 2.4 Audio capture and digitalisation................ 19 2.4.1 Signaling Protocols................... 20 2.5 Communication Protocol.................... 23 2.5.1 Session Initiation Protocol............... 23 2.5.2 Real Time Protocol.................. -
Universidad Pol Facultad D Trabajo
UNIVERSIDAD POLITÉCNICA DE MADRID FACULTAD DE INFORMÁTICA TRABAJO FINAL DE CARRERA ESTUDIO DEL PROTOCOLO XMPP DE MESAJERÍA ISTATÁEA, DE SUS ATECEDETES, Y DE SUS APLICACIOES CIVILES Y MILITARES Autor: José Carlos Díaz García Tutor: Rafael Martínez Olalla Madrid, Septiembre de 2008 2 A mis padres, Francisco y Pilar, que me empujaron siempre a terminar esta licenciatura y que tanto me han enseñado sobre la vida A mis abuelos (q.e.p.d.) A mi hijo icolás, que me ha dejado terminar este trabajo a pesar de robarle su tiempo de juego conmigo Y muy en especial, a Susana, mi fiel y leal compañera, y la luz que ilumina mi camino Agradecimientos En primer lugar, me gustaría agradecer a toda mi familia la comprensión y confianza que me han dado, una vez más, para poder concluir definitivamente esta etapa de mi vida. Sin su apoyo, no lo hubiera hecho. En segundo lugar, quiero agradecer a mis amigos Rafa y Carmen, su interés e insistencia para que llegara este momento. Por sus consejos y por su amistad, les debo mi gratitud. Por otra parte, quiero agradecer a mis compañeros asesores militares de Nextel Engineering sus explicaciones y sabios consejos, que sin duda han sido muy oportunos para escribir el capítulo cuarto de este trabajo. Del mismo modo, agradecer a Pepe Hevia, arquitecto de software de Alhambra Eidos, los buenos ratos compartidos alrrededor de nuestros viejos proyectos sobre XMPP y que encendieron prodigiosamente la mecha de este proyecto. A Jaime y a Bernardo, del Ministerio de Defensa, por haberme hecho descubrir las bondades de XMPP. -
Can Skype Be More Satisfying? a Qoe-Centric Study of the FEC
HUANG LAYOUT 2/22/10 1:14 PM Page 2 Could Skype Be More Satisfying? A QoE-Centric Study of the FEC Mechanism in an Internet-Scale VoIP System Te-Yuan Huang, Stanford University Polly Huang, National Taiwan University Kuan-Ta Chen, Academia Sinica Po-Jung Wang, National Taiwan University Abstract The phenomenal growth of Skype in recent years has surpassed all expectations. Much of the application’s success is attributed to its FEC mechanism, which adds redundancy to voice streams to sustain audio quality under network impairments. Adopting the quality of experience approach (i.e., measuring the mean opinion scores), we examine how much redundancy Skype adds to its voice streams and systematically explore the optimal level of redundancy for different network and codec settings. This study reveals that Skype’s FEC mechanism, not so surprisingly, falls in the ballpark, but there is surprisingly a significant margin for improvement to ensure consistent user satisfaction. here is no doubt that Skype is the most popular VoIP data, at the error concealment level. service. At the end of 2009, there were 500 million Hereafter, we refer to the redundancy-based error conceal- users registered with Skype, and the number of concur- ment function of the system as the forward error correction rent online users regularly exceeds 20 million. Accord- (FEC) mechanism. There are two components in a general Ting to TeleGeography, in 2008 8 percent of international FEC mechanism: a redundancy control algorithm and a redun- long-distance calls were made via Skype, making Skype the dancy coding scheme. The control algorithm decides how largest international voice carrier in the world. -
Icaeyeblinkmetrics() Version 3.2
Documentation for: icaeyeblinkmetrics() Version 3.2 This EEGLAB toolbox is designed for automated/semi-automated selection of ICA components associated with eye- blink artifact using time-domain measures. The toolbox is based on the premises that 1) an ICA component associated with eye blinks should be more related to the recorded eye blink activity than other ICA components, and 2) removal of the ICA component associated with eye blinks should reduce the eye blink artifact present within the EEG following back projection. Other than the EEG input, the only required input for the function is specification of the channel that exhibits the artifact (in most cases the VEOG electrode). This can either be stored within the EEG.data matrix or within EEG.skipchannels. It will then identify eye-blinks within the channel to be used for computation of the metrics listed below. If you are not sure what channel to choose, you can let the function determine the channel where the artifact maximally presents but this does slow the function down. The toolbox does not change the data in any way, it only provides an output stored in ‘EEG.icaquant’ providing: 1. Metrics: a. The correlation between the measured artifact in the artifact channel and each ICA component. (i.e. how similar the ICA component is to the eye blink) b. The adjusted normalized convolution of the ICA component activity with the measured artifact in the artifact channel. (i.e., how well does the ICA component overlap with the eye blink) c. The percent reduction in the artifact present in the EEG for each ICA component if it was removed. -
Polycom Realpresence Trio ™ Hands-On Testing of an All-In-One Audio, Content, and Video Conferencing Device for Small Meeting Rooms
June 2017 Evaluation of Polycom RealPresence Trio ™ Hands-on testing of an all-in-one audio, content, and video conferencing device for small meeting rooms. This evaluation sponsored by: Background Founded in 1990 and headquartered in San Jose, California, Polycom is a privately-held 1 company that develops, manufactures, and markets video, voice, and content collaboration and communication products and services. The company employs approximately ~ 3,000 people and generates more than $1B in annual revenue. Polycom has been in the conference phone business since the early 1990s2, and to date has shipped more than six million analog and digital conference phones – all with the familiar Polycom three-legged “starfish” design (see images below). In October 2015, Polycom announced the RealPresence Trio 8800 – a multi-function conferencing device intended for use in small, medium, and large meeting rooms. Figure 1: Polycom SoundStation IP4000 (L) and Polycom RealPresence Trio 8800 (R) In April 2017, Polycom commissioned members of our South Florida test team to perform a third-party assessment of the RealPresence Trio 8800 solution. This document contains the results of our hands-on testing. Note – For readability and brevity’s sake, throughout this document we will refer to the Polycom RealPresence Trio 8800 as the Trio 8800 or simply Trio. 1 Polycom was acquired by private equity firm Siris Capital in September 2016 2 Source: https://en.wikipedia.org/wiki/Polycom#Polycom_audio_and_voice © 2018 Recon Research | www.reconres.com | Page 2 Understanding -
Client-Side Name Collision Vulnerability in the New Gtld Era: a Systematic Study
Session D5: Network Security CCS’17, October 30-November 3, 2017, Dallas, TX, USA Client-side Name Collision Vulnerability in the New gTLD Era: A Systematic Study Qi Alfred Chen, Matthew Thomas†, Eric Osterweil†, Yulong Cao, Jie You, Z. Morley Mao University of Michigan, †Verisign Labs [email protected],{mthomas,eosterweil}@verisign.com,{yulongc,jieyou,zmao}@umich.edu ABSTRACT was recently annouced (US-CERT alert TA16-144A), which specif- The recent unprecedented delegation of new generic top-level do- ically targets the leaked WPAD (Web Proxy Auto-Discovery) ser- mains (gTLDs) has exacerbated an existing, but fallow, problem vice discovery queries [79, 87]. In this attack, the attacker simply called name collisions. One concrete exploit of such problem was needs to register a domain that already receives vulnerable internal discovered recently, which targets internal namespaces and en- WPAD query leaks. Since WPAD queries are designed for discover- ables Man in the Middle (MitM) attacks against end-user devices ing and automatically conguring web proxy services, exploiting from anywhere on the Internet. Analysis of the underlying prob- these leaks allows the attacker to set up Man in the Middle (MitM) lem shows that it is not specic to any single service protocol, but proxies on end-user devices from anywhere on the Internet. little attention has been paid to understand the vulnerability status The cornerstone of this attack exploits the leaked service dis- and the defense solution space at the service level. In this paper, covery queries from the internal network services using DNS- we perform the rst systematic study of the robustness of internal based service discovery. -
Allworx 9204 Phone Guide
Allworx® Phone Guide 9204 No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopy, recording, or otherwise without the prior written permission of Allworx. © 2009 Allworx, a wholly owned subsidiary of PAETEC. All rights reserved. Allworx is a registered trademark of Allworx Corp. All other names may be trademarks or registered trademarks of their respective owners. Phone Guide – 9204 Table of Contents 1 GETTING STARTED.....................................................................................................................................................1 1.1 WHAT IS IN THE BOX? ...............................................................................................................................................1 1.2 CONNECTING THE PHONE .........................................................................................................................................1 2 ADJUSTING YOUR PHONE.........................................................................................................................................3 2.1 BASE ASSEMBLY AND ADJUSTING THE ANGLE OF THE PHONE.....................................................................................3 2.2 VOLUME...................................................................................................................................................................3 3 INTRODUCTION TO YOUR ALLWORX PHONE ........................................................................................................4 -
A Fully Automated Unsupervised Algorithm for Eye-Blink Detection in EEG Signals
2019 57th Annual Allerton Conference on Communication, Control, and Computing (Allerton) Allerton Park and Retreat Center Monticello, IL, USA, September 24-27, 2019 Blink: A Fully Automated Unsupervised Algorithm for Eye-Blink Detection in EEG Signals Mohit Agarwal Raghupathy Sivakumar Electrical and Computer Engineering Electrical and Computer Engineering Georgia Institute of Technology Georgia Institute of Technology [email protected] [email protected] Abstract— Eye-blinks are known to substantially contaminate measurements. The presence of eye-blink artefacts in the EEG signals, and thereby severely impact the decoding of EEG EEG signal leads to confused or possibly false EEG inter- signals in various medical and scientific applications. In this pretations. Hence, the detection and removal of eye-blink work, we consider the problem of eye-blink detection that can then be employed to reliably remove eye-blinks from EEG components can be significantly useful in any EEG analysis. signals. We propose a fully automated and unsupervised eye- Several algorithms have been proposed in the literature to blink detection algorithm, Blink that self-learns user-specific identify eye-blinks, but they are characterized by one or brainwave profiles for eye-blinks. Hence, Blink does away more of the following limiting requirements - (i) a partly with any user training or manual inspection requirements. manual inspection for thresholds or template selection, (ii) Blink functions on a single channel EEG, and is capable of estimating the start and end timestamps of eye-blinks in a a user training phase, (iii) a high number of EEG channels, precise manner. We collect four different eye-blink datasets and (iv) Electrooculography (EOG) data requiring additional and annotate 2300+ eye-blinks to evaluate the robustness electrodes above and below the eyes. -
Mehrwerte Via IP Videokonferenztechnik Hält Einzug in Voip-Systeme
KOMMUNIKATIONSMANAGEMENT Mehrwerte via IP Videokonferenztechnik hält Einzug in VoIP-Systeme Kai-Oliver Detken VoIP-Systeme (Voice over IP) werden von Microsoft übernommen, eroberte normalerweise dazu genutzt, Telefon- als kostenloser Chat-Dienst die Welt. gespräche über IP-basierte Infrastruk- Nach und nach kamen Funktionen wie Nach wie vor tut sich in Deutschland turen zu führen. Dabei steht die Tele- Telefonie, Videounterstützung und fonie klar im Vordergrund. Videokon- Mehrpunktkonferenzen hinzu. Skype die Videokonferenztechnik schwer, ferenzsysteme entwickelten sich un- lässt sich mittels einer Applikation wenn es um Einsatz und Verbreitung abhängig von VoIP und werden oft nutzen, die inzwischen auf vielen Be- parallel dazu eingesetzt. triebssystemen erhältlich ist. Aller- geht. Allerdings haben inzwischen Aufgrund der Sicherheitsproblematik dings basiert die Datenübertragung – kein externer Anrufer darf direkt auf auf einem proprietären Protokoll. Sky- auch die IP-Telefonhersteller diese einen internen Rechner von außen zu- pe konnte sich maßgeblich durchset- Möglichkeit zur Kommunikation greifen – konnten sich Desktop-Video- zen, weil die Anwendung einfach ge- konferenzsysteme bislang nicht eta- nutzt werden kann und sich automa- entdeckt und setzen vermehrt blieren. Sie fristeten ein Nischendasein tisiert den Weg zum Zielrechner im Low-Budget-Bereich (wie z.B. Net- bahnt, d.h., die Software arbeitet hin- Bildtelefonie auf ihren Systemen ein. Meeting von Microsoft). Hinzu kam, ter den meisten Firewalls und NAT- Zudem kommt aus dem Instant- dass zentrale Server im Internet po- Routern problemlos. tenzielle Videoteilnehmer zwecks Na- Das damit vorhandene systemimma- Messaging-Lager eine mens- und IP-Adressenauflösung spei- nente Sicherheitsproblem scheint aber chern mussten, damit ein entspre- vielen Unternehmen nichts auszuma- Wiederbelebung des Themas. NET chender Videokonferenzanruf über- chen – sie nutzen Skype aufgrund der zeigt, welche Möglichkeiten es gibt, haupt abgesetzt werden konnte. -
Pipenightdreams Osgcal-Doc Mumudvb Mpg123-Alsa Tbb
pipenightdreams osgcal-doc mumudvb mpg123-alsa tbb-examples libgammu4-dbg gcc-4.1-doc snort-rules-default davical cutmp3 libevolution5.0-cil aspell-am python-gobject-doc openoffice.org-l10n-mn libc6-xen xserver-xorg trophy-data t38modem pioneers-console libnb-platform10-java libgtkglext1-ruby libboost-wave1.39-dev drgenius bfbtester libchromexvmcpro1 isdnutils-xtools ubuntuone-client openoffice.org2-math openoffice.org-l10n-lt lsb-cxx-ia32 kdeartwork-emoticons-kde4 wmpuzzle trafshow python-plplot lx-gdb link-monitor-applet libscm-dev liblog-agent-logger-perl libccrtp-doc libclass-throwable-perl kde-i18n-csb jack-jconv hamradio-menus coinor-libvol-doc msx-emulator bitbake nabi language-pack-gnome-zh libpaperg popularity-contest xracer-tools xfont-nexus opendrim-lmp-baseserver libvorbisfile-ruby liblinebreak-doc libgfcui-2.0-0c2a-dbg libblacs-mpi-dev dict-freedict-spa-eng blender-ogrexml aspell-da x11-apps openoffice.org-l10n-lv openoffice.org-l10n-nl pnmtopng libodbcinstq1 libhsqldb-java-doc libmono-addins-gui0.2-cil sg3-utils linux-backports-modules-alsa-2.6.31-19-generic yorick-yeti-gsl python-pymssql plasma-widget-cpuload mcpp gpsim-lcd cl-csv libhtml-clean-perl asterisk-dbg apt-dater-dbg libgnome-mag1-dev language-pack-gnome-yo python-crypto svn-autoreleasedeb sugar-terminal-activity mii-diag maria-doc libplexus-component-api-java-doc libhugs-hgl-bundled libchipcard-libgwenhywfar47-plugins libghc6-random-dev freefem3d ezmlm cakephp-scripts aspell-ar ara-byte not+sparc openoffice.org-l10n-nn linux-backports-modules-karmic-generic-pae -
Using Voip Midtveisrapport
INF5261 Using VoIP Midtveisrapport Thomas Bekkeheien, Magnus Lange og Mathias Hagen Innholdsfortegnelse 1 Innledning ............................................................................................................................................. 4 2 Analyse av eksisterende VoIP tilbud .................................................................................................... 4 2.1 Begreper ........................................................................................................................................ 4 2.1.1 VoIP......................................................................................................................................... 4 2.1.2 SIP ........................................................................................................................................... 4 2.1.3 SoftPhone ............................................................................................................................... 5 2.2 Oversikt over tilbydere .................................................................................................................. 5 2.2.1 Shape Services ........................................................................................................................ 5 2.2.2 Barablu ................................................................................................................................... 5 2.2.3 Nimbuzz! ................................................................................................................................ -
Exinda Applications List
Application List Exinda ExOS Version 6.4 © 2014 Exinda Networks, Inc. 2 Copyright © 2014 Exinda Networks, Inc. All rights reserved. No parts of this work may be reproduced in any form or by any means - graphic, electronic, or mechanical, including photocopying, recording, taping, or information storage and retrieval systems - without the written permission of the publisher. Products that are referred to in this document may be either trademarks and/or registered trademarks of the respective owners. The publisher and the author make no claim to these trademarks. While every precaution has been taken in the preparation of this document, the publisher and the author assume no responsibility for errors or omissions, or for damages resulting from the use of information contained in this document or from the use of programs and source code that may accompany it. In no event shall the publisher and the author be liable for any loss of profit or any other commercial damage caused or alleged to have been caused directly or indirectly by this document. Document Built on Tuesday, October 14, 2014 at 5:10 PM Documentation conventions n bold - Interface element such as buttons or menus. For example: Select the Enable checkbox. n italics - Reference to other documents. For example: Refer to the Exinda Application List. n > - Separates navigation elements. For example: Select File > Save. n monospace text - Command line text. n <variable> - Command line arguments. n [x] - An optional CLI keyword or argument. n {x} - A required CLI element. n | - Separates choices within an optional or required element. © 2014 Exinda Networks, Inc.