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Accounting and Inspecting IP Telephony Traffic
Sivák, Vladimír ; Ryšavý, Ondřej (referee) ; Matoušek, Petr (advisor)
This thesis describes architecture of IP telephony networks based on signaling protocol SIP and transport protocol RTP. Also tools used for analyzing VoIP traffic are described. Main objective is to design and implement a system for the detection of calls and extraction of voice payloads from the captured packets. The system first recognizes the signaling messages of SIP protocol. These messages are analyzed afterwards. Output statistics are generated based on gathered data. Voice data will be stored in form, which is suitable for further processing.
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Analyzing IP Telephony over H.323
Karpíšek, Filip ; Ryšavý, Ondřej (referee) ; Matoušek, Petr (advisor)
This thesis describes protocols from H.323 standard. Tools used for analyzing VoIP calls over H.323 are described. The main object is to describe a design and implementation of a tool for analyzing IP telephony over H.323. The tool seeks and decodes signaling messages. These messages are analyzed for information about call itself (time of beginning and end of a call, call numbers of participants, etc.) and for information necessary for capturing multimedia data. When captured, multimedia data are exported for proper post-processing. Call information are exported as XML structures.
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Design of a virtual local computer network for educational purposes
Janošík, Martin ; Polívka, Michal (referee) ; Škorpil, Vladislav (advisor)
The master’s thesis focuses on the virtual local computer network for laboratory usage. It aims to propose and realize proper network connection in order to monitor expected data flow. Thanks to the network analysers (software ClearSight and hardware NetTool Series II) it plans to pursue in detail the used transmission protocols of TCP/IP layers. The most decisive feature happens to be the right choice of appropriate network components and their precise configuration. Consequently, the thesis formulates a proposal of a laboratory task for the needs of students, which is also closely related to the actual problems. The assignment of the task will serve the teachers as a test pattern for measurement. The results elaborated in the form of the model protocol should enable later comparison of the recorded data. Another part of the diploma thesis is the working-out of well arranged manuals for the network analysers involved.
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Security of VoIP protocols
Novotný, František ; Číka, Petr (referee) ; Krajsa, Ondřej (advisor)
This bachelor dissertation deals with the VoIP (Voice over Internet Protocol) safety. The most used transport and signal protocols employing this technology are presented first. Two extended protocols, SIP (Session Initiation Protocol) and IAX (Inter-Asterisk eXchange Protocol), as well as open source Asterisk, which is closely connected with these protocols, are shown in detail. After that, methods, attacks and threats able to assure secure transfer in the use of VoIP among users are described. Afterwards the practical part of this essay, divided into two parts, is presented. In the first part, a passive attack in the form of tapping is demonstrated, and in the second, active attacks are described which take the form of forced cancellations and forwarded calls between two communicating users. With both attacks, safety measures that could effectively prevent against their potential attacking are proposed. In the closing part, the VoIP safety is evaluated for securing a quality connection between users communicating through it.
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Security of real time multimedia data transmission
Otoupalík, Petr ; Koutný, Martin (referee) ; Hošek, Jiří (advisor)
This thesis deals with technology and security of real-time multimedia data transmission. The possibilities of the security of a multimedia data transfer and the mechanisms defined for the security of the signaling protocols SIP and H.323 are described with the view of security. The possible attacks on the real-time transfers are also mentioned. The basic requirements on the safe and reliable data transfer are specified. The main part of this thesis is focused on the security analysis of the data transmission of the selected communication clients, which use different security methods. The last part of the thesis deals with realization of simple attacks on multimedia data transmission and also on the SIP protocol.
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IP Television
Mašek, Pavel ; Fojtová, Lucie (referee) ; Číka, Petr (advisor)
The main objective of thesis is proposal and realization programme, which can be able to receive and play up multimedia stream broadcasted from server via packet networks. Protocol for transmission multimedia data is used to join connection between server and end point. And therefore protocols which handle data transmission like RTP/RTCP, RTSP and also SDP and SAP are described in thesis. Description mentioned records isn't effected to the smallest details, but acts about acquaint with problems. Further be brief described libraries that the stand by drafting application in view as well as used application that the function as the source of transmission multimedia. Than follows proposal solving and single step description of programme design in thesis. Analysis of working programme is performed in the last part of thesis.
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Transmission of Audio Data Using RTP Protocol
Novotný, Roman ; Atassi, Hicham (referee) ; Kouřil, Jiří (advisor)
This project is about technology of multimedia transmission in the real time. Introduction of this work narrate model TCP/IP. Next the bachelor´s thesis is principally aimed on theoretical design of application, which is minimally able to transfer audio data between two computers by the help of the protocol RTP. This part is included in protocols for transmission of data in the real time, especially protocol RTP and then freely accessible libraries, which are written in language C and C++, in which is RTP protocol just implemented. End of this work comes out from these knowledges, in which is realized theoretical design and it is in developmental environment of Borland Builder C++.
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Signalling Transmission for Internet Television
Burget, Radim ; Makáň, Florian (referee) ; Vodrážka,, Jiří (referee) ; Komosný, Dan (advisor)
A signalization in an Internet protocol environment is commonly used for monitoring quality of service and other parameters of a network. This thesis is involved in transmission of signalization through internet protocol networks and proposes scalable solution for small and even for large-scale internet television broadcasting. The main contribution of this thesis lies in design and validation of optimal hierarchical tree on the basis of resources assigned. This is done in respect to geographical distance, network distance of each particular member of the hierarchical structure. For the design of algorithms simulations and global experimental network were used.
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Real-time protocol implementation
Procházka, Jan ; Skořepa, Michal (referee) ; Burget, Radim (advisor)
Thesis deals with multicast broadcasts, discusses the type of ASM and SSM. Also deals with the principle of RTP / RTCP protocol for large multicast groups, for example, broadcasting IPTV. It was created a model for simulating the behavior of the network load in a large number of receivers. The application was developed in Java and uses the recommendations of RFC3550. There are also analysed processes of communication, initialization, log out, the structure of the data packets and signaling packets. The system is designed that can simulate multicast network and obtain the estimated parameters of the operation, or can operate in real traffic, for example, as a third-party monitor. In both modes, the measurement was carried out model situations. The results of the measurements were then compared. Principle and system control was described in detail. Output measurements are graphically processed and included in the work.
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Location of VoIP caller in emergency
Mrník, Martin ; Krajsa, Ondřej (referee) ; Komosný, Dan (advisor)
This master thesis deals with the problem of localization of the caller to the emergency line with focus on VoIP calls. It contains general description of the main active and passive geolocation methods, and explains their function. The paper analyzes market share of different VoIP clients and describes the program Skype. The focus of this work is to create an application for geolocation of the caller using analysis of VoIP transmission. The application gains IP address of the caller by capturing packets and displays his/her location on the map. The coordinates are obtained from the MaxMind GeoLite City database which been chosen by evaluating objective parameters as the most suitable for desired use.
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