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Communication systems based on IP telephony
Zimek, Josef ; Kapoun, Vladimír (referee) ; Herman, Ivo (advisor)
My master’s thesis is focused on designing and creating communication network, which provides communication between two independent networks through encrypted tunnel. My solution is based on routers formed by older personal computers with FreeBSD like a operating system. Between routers is created static encrypted tunnel by using IPSec protocol. Voice services provides packet oriented exchange Asterisk with support of signaling protocol SIP. This solution can be used eg. for connecting remote branch to headquarters of company and then can branch utilize shrared resources. To headquarters can connect also remote workers from their home. In this case are used SSL certificates to authentication of user. This scenario is very required today.
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Management and configuration of Asterisk VoIP exchange
Binder, Tomáš ; Krajsa, Ondřej (referee) ; Číka, Petr (advisor)
This diploma dissertation is dealing with the VoIP software exchange Asterisk. In the dissertation there are described its abilities and possible ways of its configuration. Special attention is given to the signalling protocol SIP, which is described in one of the chapters. Within this dissertation a dial plan, which demonstrates the technique of dial plan creating, was created. Within the boundaries of the dialplan following services could be found: a voicemail, conference, Interactive Voice Response and call queues. Configuration files, with the help of which the exchange is configurated, are described in my dissertation as well. Finally, three laboratory assignments for purposes of the subject Multimedia Services are mentioned. Their main aim is to familiarise students with the creation of SIP accounts in the exchange, their mutual connections, defining the Interactive Voice Response and forming a new call centre.
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Design of variable snow plow
Hrůza, Michal ; Klapka, Milan (referee) ; Dvořáček, Jiří (advisor)
This bachelor thesis deals with construction draft of a variable snowplough as an additional device to Spider 3Rider machine. The content of the thesis is a research study of snowploughs construction types, their operation and ensuring safety. Based on information gained are designed construction solutions of a given snowplough, comparison of their construction and usage suitability. The result of the thesis is a construction solution of a variable snowplough, solidity control of critical places and a drawing documentation of the set.
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Economic and technical aspects of the use of IP telephony in the segment of small and medium-sized businesses
Holásek, Lukáš ; Doležel, Michal (advisor) ; Buchalcevová, Alena (referee)
This work is focused on the introduction of VoIP technology in the environment of small and medium-sized company from techno-economic perspective. The work introduces the VoIP technology in terms of functionality, but also with economic aspects of IP telephony. The aim is to determine whether the transition to VoIP technology may reduce corporate telecommunication costs while contributing to the development of corporate communications. Readers are shown the advantages, but also what the limitations and difficulties are associated with the transition to VoIP technology. The beginning is devoted to basic characterization of classical phone technology, which is good to know when deciding if one should migrate to VoIP. The work also describes the development of the telecommunications market in the Czech Republic in the context of the payment of charges for telecommunications. The practical part analyzes the specific deployment of a VoIP solution to one of Czech companies.
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Autoconfiguration of IP phone
PANUŠKA, Václav
The main topic of this bachelor thesis is Autoconfiguration of IP telephones in a business environment based on open-source software. The advantage of this solution is lower financial burden on the company and easier management of IP phones. The theoretical part is a description of the basic resources VoIP telephony and autoconfigu-ration system of IP phones. The practical part describes the practical configuration of the servers that are used in VoIP and practical verification of autoconfiguration system with IP phone Cisco SPA 502.
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VoIP - new way of communication
Černý, Jan ; Pavlíček, Antonín (advisor) ; Škop, Miroslav (referee)
The subject of this bachelor thesis is IP telephony as a new way of communication capable of replacing the current analogue telephony adequately. The aim is to introduce the VoIP environment, principles and also its real use. The thesis is divided into three parts. The first part is focused on the above mentioned environment as well as on used layers and protocols of OSI and TCP/IP models. The second part looks into the VoIP technology itself, from voice digitalization to voice transfer using various protocols. Discussed is older signalization protocol H.323 and its successor SIP. Furthermore the chapter examines various VoIP types and threads to VoIP as well as terms like QoS or ENUM. The third part contains a case study of implementing VoIP in practise. The case study shows matters that need to be taken into consideration when implementing this technology but mainly reveals how much can be saved per month, how big is the initial investment and its rate of return.
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VoIP- IP network voice communication
BERAN, Václav
The possibility for using the VoIP technology as an alternative solution for the te-lephone system is very attractive. The main reason is the widely expanded computer sites and also their higher effectiveness. The main goal of the work is to describe the VoIP technology and create the first publication in Czech republic which deals with this theme in details. First of all I concentrate on the explanation of the basic words, conceptions and principles necessary to fully understand the whole field. The main scope of the work is VoIP technology which is described in third chapter. There are described also the methods of voice coding, signalling protocols (SIP, H.323, MGCP, IAX) and issues related with QoS. The work also covers the Skype program with descriptions of it's principles, installation and control.
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IP telephony for medium and large companies
Jirák, Tomáš ; Pokorný, Pavel (advisor) ; Jelínek, Jiří (referee)
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.
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Security of Enterprise VoIP Telephony Networks
Šolc, Jiří ; Pavlíček, Luboš (advisor)
This thesis focuses on enterprise VoIP telephony network security. Introduces brief comparison of old analog and digital voice networks and IP telephone networks with special focus on VoIP system security. The goal of the thesis is to identify the risks of implementation and operation of VoIP technologies in enterprise environment and so thesis brings some conclusion how to minimalize or avoid these risks. First two chapters briefly introduce the development of telephony technologies with differentiation of enterprise telephone network from public telephone networks. Further it describes individual technologies, digitalization of voice, processing the signal and VoIP protocols and components. Third chapter focuses on infrastructure of telephony networks with special interest for architecture of IP telephony and ways of establishing call processing. It describes data flows for further security risk analysis, which this technology came with. Fifth chapter is about enterprise security standards in common and is trying to describe information security management system (ISMS) adopting VoIP technology. Individual security threats and risks are described in sixth chapter, along with known methods how to avoid them. Final parts of thesis concludes of two real situation studies of threats and risks of VoIP technologies implemented in environment of small commercial enterprise and medium size enterprise, in this example represented by University of economics. These chapters conclude theoretical problems shown on practical examples.
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Technologie VoIP
Stieranka, Michal ; Šalamon, Tomáš (advisor) ; Eyberger, Milan (referee)
Práce nabízí principy moderních telekomunikačních technologií, zejména se zaměřuje na technologii VoIP (Voice over IP), neboli na Internetovou telefonii. První dvě části se soustředí na popis klasických telekomunikačních a datových technologií. Čtenář tak získá či si prohloubí znalosti principů klasické telefonie, seznámí se zde například s funkcí telefonních ústředen a telefonních linek, s různými technologiemi přenosu hlasu po pevných linkách apod. Dále čtenář získá nezbytný základ principů datových sítí. Třetí část je plně věnována technologii VoIP. Poslední část přináší praktické zkušenosti s používáním VoIP telefonů.
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