In this graduation thesis wants introduce possibilities of voice transportation in IP networks like Internet. There are described behaviors of IP network, internet connectivity possibilities, voice protocols included Skype and economical outputs. There are mapped positives and negatives of technology including implementation issues. All economic comparisons are made to Telefonica O2 Czech Republic Inc., which is still telecommunication company with majority in the Czech Republic. There are compared samples of VoIP providers with preferences like company live time, lowest cost and guaranteed quality. Description starts with model situation and continues to real case studies. Case studies describe economic calculation, implementation and target analysis. There are three case studies: small company with fast migration in one time, medium company witch accelerated migration in two steps and large company with conservative and control migration in three steps.

En stor andel av de med missbruksproblematik har visats ha samtidig psykisk ohälsa.Individer med samsjuklighetsproblematik är en sårbar grupp. De löper exempelvis större risk för suicid jämfört med de med endast missbruksproblematik eller psykisk ohälsa, och de har även försämrad tillgång till vård. För att dessa individer ska tillförsäkras adekvat vård och stöd krävs insatser från både kommunal och regional verksamhet. Upprättandet av en samordnad individuell plan (SIP) är en lagstadgad skyldighet i såväl hälso- och sjukvårdens som socialtjänstens verksamheter men studier har pekat på ett ojämnt användande av SIP. Syftet med den här studien är att identifiera och förstå hinder för samverkan i form av SIP kring personer med samsjuklighetsproblematik utifrån de yrkesverksamma inom områdets berättelser. Data samlades in genom 10 semistrukturerade intervjuer med yrkesverksamma som arbetar med personer med samsjuklighet. Data analyserades utifrån ett teoretiskt ramverk som bestod av: Socialkonstrutionism, Luhmanns systemteoretiska perspektiv och i synnerhet hans begrepp funktionell differentiering samt inslag av den nyinstitutionella teoribildningen. Resultatet visar att (1) yrkesverksamma inom hälso- och sjukvården respektive från socialt arbete definierar orsaker, pekar på konsekvenser, formulerar lösningar samt vilka värden som motiverar stöd och hjälp på skilda sätt. Jag menar därför att samsjukligheten konstrueras olika av de olika aktörerna eftersom de anlägger olika perspektiv: ett medicinskt och ett som utgår från socialt arbete. (2) Informanternas tolkningar av samsjuklighetsproblematiken påverkas av organisationens behov av att legitimera sitt handlande. (3) Hinder för samverkan uppstår när SIP används som ett forum för att kompensera för bristfälliga insatser; skilda perspektiv i frågan när en individ är behandlingsbar; professionella från de olika verksamhetsområdena tolkar varandras agerande utifrån sina egna referensramar.

This master’s thesis delves into the possibilities of the open-source Private Branch Exchange Asterisk, elaborates on its features and compares it with several other distros. The term SIP stack is explained here with the mention of two of its representatives. Further in the thesis, the security risks of the VoIP technology are explained, and specific attacks are described and then realized. As a part of the testing process, the possibilities of a custom module and its following implementation are explored, as well as the portability between the individual distros and its proper functioning.

This project consists of three parts. The first part is aimed to summarize list of actual packaging systems and especially systems using 3D construction. Project continues in the second part, which is more practical and contains design and production of organic and inorganic testing substrates for lead-free soldered 3D structures. Last experimental part is about tests performed on soldered substrates and evaluation of results of these practical tests.

The goal of the master’s thesis was to propose two laboratory exercises, integrating newly purchased devices HTC Desire and Nokia N900. Designed tasks bring new technologies and services to education process. The first task examines the configuration of branch exchange Asterisk PBX and analyzes SIP protocol. Part of exercise is concentrated on high-speed data transmission in mobile and wireless networks, regarding to usability of VoIP technology. The second exercise introduces to vulnerability of VoIP technology. It contains simulations of attacks on branch exchange Asterisk, DoS attack and discusses methods to secure VoiP communication. The part of this exercise examines usage of HTC Desire phone, instead of ordinary Wi-Fi access point.

The aim of this diploma thesis is 3D package design study and elaboration of rules for effective thermal and electrical design. There are recommendations and equations for calculating parameters affecting design of modern SOP and SIP packages mentioned in this thesis. Advantages of modern technologies in thermal management of packages are demonstrated in the second part of thesis using ANSYS workbench.

This study examines the use of SS7 signaling system over IP networks by using the open source PBX YATE. At first it starts with describing the SS7 followed by an explanation of the function of each of its levels and the messages that are used within the SS7 network. The study then sheds some light on the ways of using SS7 inside IP network with the use of some protocols. It also discusses the architecture of YATE and its files, and how it is installed in Linux operating system. Finally, it describes the important files for delivering this task. The study was commenced by using two virtual machines that have two different open source PBX's which are YATE and Asterisk, and after acquiring some results by establishing communication between them via the means of SIP trunk, furthermore the study was extended to the laboratory in order to test it over real servers that have TDM cards, in order to apply the study by the means of SS7 protocols, SIGTRAN, MGCP gateway and SIP-T. The experiments have almost delivered successful communications after conducting a configuration for the files on multiple sides.

This diploma thesis focuses on attacks on PBX Asterisk, FreeSWITCH and Yate in LTS versions. In this work was carried out two types of attacks, including an attack DoS and the attack Teardown. These attacks were carried out using two different protocols, SIP and IAX. During the denial of service attack was monitored CPU usage and detected if its possible to establish call and whether if call can be processed. The Security of PBX was build on two levels. As a first level of security there was used linux based firewall netfilter. The second level of security was ensured with protocols TLS and SRTP.

Práce se zabývá možnostmi implementace VoIP do existujícího XMPP programu se sdílenou tabulí. Analyzuje možnosti využití současných technologií pro podporu VoIP.  Cílem je nahrazení stávajících komunikačních knihoven klienta za telepathy. Dále také přidání VoIP.

Diplomová práce popisuje VoLTE službu, vývoj a nasazení LTE (zaváděcí fázi, skutečný LTE stav a výhledy do budoucna atd.), EPC-IMS architekturu (popis funkce uzlu, rozhraní atd.) Komunikace mezi uzly a funkce, rozhraní a protokoly jsou používány v průběhu signalizace (SIP SDP) a datový tok (RTCP RTP). Práce stručně popisuje základní toky hovorů, typy nosičů (GBR and N-GBR), a to vytvoření / mazaní nosičů během komunikace. Další část diplomové práce o implementaci volte, instalace a konfigurace IMS. Závěrečná část diplomové práce popisuje zkoušky sítě a, analýzu protokolu.