This master's thesis is focused on VoIP communications. It describes deploy of the operating system OpenWRT, analog interface of router Gigaset SX762 and GSM gateway for receiving or place calls. The paper describes the protocols involved in the communication and basic configuration elements. Deploying IP telephony enables to reduce the cost of operation and provides a number of additional functions.

O presente trabalho teve como objetivo propor e testar uma metodologia para a realização de bindings dinâmicos na tecnologia LonWorks®, com a finalidade de permitir que um Sistema Distribuído de Comunicação Telefônica Privada (SDCTP), também desenvolvido com a tecnologia LonWorks®, realizasse seus enlaces telefônicos. Para tal, utilizou-se uma metodologia voltada para equipamentos embarcados e a visão de agentes reativos no desenvolvimento de cada dispositivo de rede, oferecendo uma solução única, prática e totalmente inédita na tecnologia LonWorks® e nos dispositivos de PABX. Essa visão resultou no desenvolvimento de dispositivos inteligentes e totalmente autônomos, no que diz respeito aos seus processos internos, gerando resultados satisfatórios e mais eficientes do que se esperava com base nos requisitos levantados para o sistema SDCTP. Este trabalho é o ponto de partida e oferece uma base para o desenvolvimento de novas funcionalidades, tanto nos sistemas de telefonia atuais, quanto nas redes de controle. / This presentation has the goal to propose and test a new method to implement dynamic bindings in LonWorks® technology, allowing a new Private Telephony Comunication Distributed System (SDCTP), also developed with LonWorks® technology, to make their telephone links. In order to do this, a method for developping embedded systems and the reactive agent view was applied for each different devices in this new system, thus offering a unique, practical and innovative solution for both, LonWorks® and PBX systems. This view allowed the implementation of intelligent and autonomous devices, specially in their internal process, thus granting satisfactory and more efficient results based on the SDCTP requirements. This work is the kick-off and the basis for developing new functions for telephone systems and control networks.

O presente trabalho teve como objetivo propor e testar uma metodologia para a realização de bindings dinâmicos na tecnologia LonWorks®, com a finalidade de permitir que um Sistema Distribuído de Comunicação Telefônica Privada (SDCTP), também desenvolvido com a tecnologia LonWorks®, realizasse seus enlaces telefônicos. Para tal, utilizou-se uma metodologia voltada para equipamentos embarcados e a visão de agentes reativos no desenvolvimento de cada dispositivo de rede, oferecendo uma solução única, prática e totalmente inédita na tecnologia LonWorks® e nos dispositivos de PABX. Essa visão resultou no desenvolvimento de dispositivos inteligentes e totalmente autônomos, no que diz respeito aos seus processos internos, gerando resultados satisfatórios e mais eficientes do que se esperava com base nos requisitos levantados para o sistema SDCTP. Este trabalho é o ponto de partida e oferece uma base para o desenvolvimento de novas funcionalidades, tanto nos sistemas de telefonia atuais, quanto nas redes de controle. / This presentation has the goal to propose and test a new method to implement dynamic bindings in LonWorks® technology, allowing a new Private Telephony Comunication Distributed System (SDCTP), also developed with LonWorks® technology, to make their telephone links. In order to do this, a method for developping embedded systems and the reactive agent view was applied for each different devices in this new system, thus offering a unique, practical and innovative solution for both, LonWorks® and PBX systems. This view allowed the implementation of intelligent and autonomous devices, specially in their internal process, thus granting satisfactory and more efficient results based on the SDCTP requirements. This work is the kick-off and the basis for developing new functions for telephone systems and control networks.

Made available in DSpace on 2016-04-18T21:39:45Z (GMT). No. of bitstreams: 4 Antonio Carlos GIANOTO1.pdf: 620239 bytes, checksum: aa779772dff23531ab717870d36823d3 (MD5) Antonio Carlos GIANOTO2.pdf: 1522259 bytes, checksum: 928d1a566cc9977b69a13b358fe13a50 (MD5) Antonio Carlos GIANOTO3.pdf: 2036577 bytes, checksum: 4ef7b886a0d20792d494deb085435041 (MD5) Antonio Carlos GIANOTO4.pdf: 1519186 bytes, checksum: cce13633bbc1cf7d5714a8dd727dd008 (MD5) Previous issue date: 2006-06-29 / Fundo Mackenzie de Pesquisa / The aim of this elaboration is to present a study of the migration process involved transforming the digital PBX (Private Branch Exchange), TDM (Time Division Multiplex), SPC (Stored Program Control) based platforms of corporate communications on technology to converged IP (Internet Protocol) systems supported by the TCP/IP (Transmission Control Protocol/Internet Protocol) protocol. This proposal analyzes the necessary interventions in order to preserve the investments made in these platforms, integrating them to existent data networks. Beside other benefits presented in this work, one key advantage is the possibility to transport voice over an existing data infrastructure, optimizing usage of carrier connections. / O objetivo desta dissertação é o de apresentar um estudo do processo de migração de plataformas de voz PABX (Private Automatic Branch Exchange) TDM (Time Division Multiplex) de comunicações corporativas baseadas na tecnologia CPA-T (Controle por Programa Armazenado estágio de comutação temporal digital), para sistemas convergentes suportados pelo protocolo TCP/IP (Transmission Control Protocol/Internet Protocol). São analisadas as intervenções necessárias para esta migração, preservando ao máximo os investimentos efetuados nestas plataformas, integrando-as as redes de dados existentes. Dentre outras vantagens apresentadas no texto, destaca-se a otimização dos acessos fornecidos pelas operadoras de telecomunicações pelo compartilhamento da infra-estrutura da rede de dados para o tráfego de sinais de voz.

Projektet har till syfte att undersöka den revolutionerande tekniken bakom IP-telefoni. Eftersom tekniken är relativt ung så finns det fortfarande mycket att lära om hur det fungerar och hur den används. Projektet behandlar fördelar och nackdelar samt vilka hot som finns och hur man kan känna sig säker när man använder IP-telefoni till vardags. Det primära objektivet med projektet är att få en helhetsbild och förstå hur tekniken verkligen fungerar. Vidare behandlas telefonens historia då det är viktigt att se var tekniken har sina rötter och hur den utvecklats sedan dess. Som en röd tråd från telefonens teknologi och det publika telefonnätets rötter görs en jämförelse mellan de två teknologierna för att se skillanderna och förmodade fördelar och nackdelar med de båda systemen. Olika sorters protokoll som har ett nära förhållande till IP-telefoni så som SIP, RTP, UDP och IP behandlas. För att få en sanningsenlig bild över hur vardagliga användare upplever IP-telefoni så har en enkätundersökning angående vanor och möjliga problem gjorts hos de anställda på Region Skåne.

This master’s thesis dissertate the possibilities of the linkage between Asterisk softswitch and the 4th generation private branch exchange. This should create a new generation’s network, so-called NGN, by the convergence of existing telecommunication networks with an IP computer network. This master’s thesis is divided into several chapters. In introduction is described the evolution of the private branch exchanges as well as the principles of the voice digitizing, codecs and signaling commonly used in both TDM and VoIP networks. The main aim of this project is the configuration of Asterisk software exchange for connection with PBX Alcatel 4400 as well as public phone network PSTN. Another goal of this master’s thesis was the configuration of Alcatel PBX and diagnostics of CCS and CAS signaling on E1 interface. In conclusion there are summarized advantages of NGN networks and their utilization in the future.

This thesis contains description of the present methods and algoritms for measuring the quality of telephone call on the PBX Asterisk. Further develop the concept of a system for measuring and implementing the call embbeded system VOIPAC PXA270M. Based on theoretical analysis is carried out discussions between C, Java and PHP,which results in the selection of appropriate programming language suitable for implementation in embedded system. The concept is realized by creating an application written in a particular programming language. Part of this work is verification created application using experimental measurments of telecommunications system. The results of experimental measurements are discussed in the final evaluation.

This master project focuses on the possibilities of protecting the most common free software PBX Asterisk, FreeSWITCH and YATE. In practice, it was verified the behavior of PBX in the attacks and suggested protection against them on one of the most popular distributions of Linux server on CentOS. Tool was created to simulate several types of attacks targeting denial of service. Both protective options PBX themselves and operating system capabilities are used in this work. Comparison was also the possibility of protection of individual PBX with each other. It also includes a brief description of the protocol, topology attacks and recommendation for the operation of softswitches.

<p>  </p> <p>Polymer bonded explosives (PBX) are a particle reinforced composite containing a high solids loading of explosive particulates bound in a polymer matrix. Commercially produced energetic particulates contain some percentage of flaws in the form of contaminants, porosity, and preexisting fractures. Additional large-scale porosity within the composite is generated during PBX formulation. The introduction of novel additive manufacturing techniques to the energetics field alters the known composite structure and introduces a porosity variable that has not been fully characterized. Porosity collapse during deformation is believed to be a predominant mechanism for hotspot formation, which dominates shock initiation behaviors. These phenomena are difficult to experimentally characterize due to inherent small spectral and temporal scales, and as such numerical and computational models are relied upon to inform fundamental physics. Experimental characterization of the behaviors of energetic materials during deformation is necessary to better inform computational studies and improve our understanding of hotspot formation mechanisms. </p> <p>This dissertation experimentally evaluates the high-rate deformation of porosity in individual explosive particulates and within the overall composite structure. This has included the development of a novel micromachining technique for pore generation in energetic single crystals using the focused ion beam (FIB), resulting in precise and controllable porosity generation that is easily reproducible in collaboration with computational studies. FIB was shown to be an effective pore generation technique, verified by assessing surface roughness and pore quality compared to contemporary manufacturing methods. Three experimental subsets are evaluated: surface cracks in HMX single crystals, polygonal pores in HMX single crystals, and large-scale porosity variations in mock vibration assisted print (VAP) produced composites of borosilicate glass beads and Sylgard 184® binder. A single stage light gas gun was used to impact the samples at 400 m/s and the impact event and resultant material response were observed in real time using x-ray phase contrast imaging (PCI). Machined surface cracks were shown to have negligible effect on the final fracture behaviors of HMX crystals. In polygonal pores fractures were shown to originate due to stress concentration during impact followed by otherwise expected brittle fracture behaviors. For wedge-like pores, the shockwave culminates on the front face of the pore and contributed to early fracture in some samples as well as a consistent open fracture opposite the impact along the shockwave direction in later stages of impact. For the blunt rectangular-like pores two differing behaviors were observed, wherein either the pore condensed and fracture at the pore was not seen during the impact event or large open fractures formed at the pore corners opposite the shockwave. The variance in response is attributed to the energy of fracture dissipating somewhere else in the material bulk, like the behaviors observed in the milled slot samples. Finally, additively manufactured PBX deformation behaviors were observed to be dominated by the collapse of the existing ordered porosity in the bulk which occurred at an increased rate relative to the bulk material compression. This resulted in a three-stage progression of deformation, consisting of a rapid collapse of large-scale ordered porosity, followed by the densification of the remaining features, and ultimately ending in compaction of the bulk as the impact projectile fully compressed the samples. Future work includes exploration of further FIB produced pore effects on dynamic fractures, evaluation of printed material deformation behaviors at additional rates, as well as application and evaluation of additional VAP printed material formulations.  </p>

The thesis deals with the numbering plan, PBX, tariffs, draft disable tariff system and its possible extensions. Within numbering plans work deals with shapes of national and international figures, describes different types of these numbers, description of the structure and definition of fields, including the length of these fields. Within countries and regions of the Czech Republic are given individual prefix for both fixed and mobile networks. There are mentioned special shapes that are different in length compared to standard types. All these types of shapes are listed according to ITU-T. Within the exchanges are given generation switches, PBXs use within the telephone network and a description of the selected functions. Furthermore, there are kinds of pricing and options of valuation call. The work contains a description of automated acconting system, according to the principle of work of the program and a description of the individual steps and functions that thanks to the cooperation process individually each calls, convert numbers to international form, assigns the call tariff and appreciate the call according to the tariff. Finally, there are described possible extensions of this automated acconting system.