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Cross-platform performance testing of open source PBX FreeSWITCH
Melichar, Ondřej ; Kováč, Dominik (referee) ; Šilhavý, Pavel (advisor)
This bachelor’s thesis deals with the open source private branch exchange FreeSWITCH. The thesis describes the process of installation and consecutive configuration of the telephone system on various distributions of platforms Windows and Linux. Emphasis is placed on comparison of the performance between these systems and also the quality of calls as well as transcoding functionality. Specifically, the performance of the telephone system is tested while using the SIP protocol. Thesis also contains an introduction into the subject and a brief description of the FreeSWITCH architecture and its functions and capabilities.
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Securing IP PBX against attacks and resistance testing
Kakvic, Martin ; Šedý, Jakub (referee) ; Šilhavý, Pavel (advisor)
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.
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Performance limits, reliability and security of open source PBX
Bednár, Jakub ; Šedý, Jakub (referee) ; Šilhavý, Pavel (advisor)
The aim of this thesis is to install and to configure three Open source PBXes Asterisk, Freeswitch and YATE. Furthermore, the aim is to realize the performance test and stability tests on three different HW configurations with the tester Spirent Abacus 5000. The scripts in bash were created to monitor PBX performance. Another part of the study is to analyze and to compare PBX security and to compare the Open Source PBX with a proprietary PBX Alcatel-Lucent OXE.
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Securing IP PBX against attacks
Hynek, Luboš ; Krajsa, Ondřej (referee) ; Šilhavý, Pavel (advisor)
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.
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Testing of IP PBX resistance against attacks using Spirent Avalanche tester
Zelenay, Martin ; Šedý, Jakub (referee) ; Šilhavý, Pavel (advisor)
This work explores, analyzes and rate infuence of VoIP attacks on open source pbx functionality. It describes how voice over IP attacks are achieved according to security standards. There are described concepts and basics of VoIP networks with orientation on facts necessary to understand analyzed actions and measurements in theoretical part. In practical part, there is described realization of attack tests according to instructions with first orientation on initial checking of testing device, pbx’s and security attack possibilities and then complex creation and testing of attack scenarios types such as fuzzing and denial of service attacks.
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Grammar Based Automatic Speech Recognizer
Škorvaga, Vojtěch ; Karafiát, Martin (referee) ; Schwarz, Petr (advisor)
This work describes a development of system for network compilation for speech recognition based on Speech Recognition Grammar Specification (SRGS) grammar defined by W3C consortium. Together with the new module, the recognizer was integrated to the FreeSwitch software phone switch using a combination of MRCPv2/SIP/RTP networks protokols and tested.
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Open source PBX FreeSWITCH
Hynek, Luboš ; Daněček, Vít (referee) ; Šilhavý, Pavel (advisor)
This bachelor thesis focuses on the possibilities of using alternative soft-switch FreeSWITCH. It is verified the possibilities and difficulties of the installation (including expansion cards) onto the most popular Linux distribution, Ubuntu, in practice. The installation is described in such a way that we can get a functional PBX with secure communication using the SIP protocol, the routing of the analog phone and the primary circuit E1, if the procedure is followed. Emphasis is placed on communication security against eavesdropping on the route. It also contains a comparison of their options with the most Asterisk PBX software. It also includes a brief history and division of telephone exchange and transmission systems into generations. Finally there are two laboratory tasks designed to focus on the configuration of the SIP protocol PBX and the use of secure protocols during communication.
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Testing of SIP implementations in open source PBX's
Papež, Nikola ; Krajsa, Ondřej (referee) ; Šilhavý, Pavel (advisor)
This diploma thesis examines and compares several selected libraries of SIP protocol, performance, stability, security and impact of their configuration. The main functions of the signalling protocol are briefly named at the beginning. The following chapters describe the tested PBXs and several stacks for SIP protocol are theoretically compared. The practical part deals with measurements conducted on the load generator Spirent TestCenter C1 which is used for all the performed tests on exchanges. All the mentioned SIP libraries, PBXs and the operating system on which the PBXs were running are open source software.
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WebRTC implementation in Open-source PBX's
Šalko, Jaroslav ; Papež, Nikola (referee) ; Šilhavý, Pavel (advisor)
The topic of this work is verification of support WebRTC communication through selected Open Source PBX. This work examine demands for WebRTC communications and describes configuration of branch centers for this type of communication. In the theoretical part is reader acquainted with the term WebRTC and with protocols related to this kind of communications. The purpose of this part of the work is to bring the reader closer look to the principles of functioning to ensuring support for this kind of communications. This is also connected with Description of basic interfaces of WebRTC applications. Further the reader finds the configuration of the selected Open Source PBX so that they can make audio-video call between WebRTC clients. This section is divided into three subchapters, each of it deals with the same problems for one of the aforementioned PBX. At the end of each chapter where the PBX PBX is configured step-by-step, test calls are made. These calls are captured by the Wireshark packet analyzer and serve as a demonstration of the WebRTC configuration functionality. At the end of this section, PBXs are compared against each other about WebRTC support. Practical part is dealing with laboratory task for students which are studying subject telecommunication and information systems. In the task students will be configuring WebRTC for PBX Asterisk. The task contains brief description of WebRTC and comments for all steps for configuration. All steps and facts are demonstrated by exemplary configuration files.
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Grammar Based Automatic Speech Recognizer
Škorvaga, Vojtěch ; Karafiát, Martin (referee) ; Schwarz, Petr (advisor)
This work describes a development of system for network compilation for speech recognition based on Speech Recognition Grammar Specification (SRGS) grammar defined by W3C consortium. Together with the new module, the recognizer was integrated to the FreeSwitch software phone switch using a combination of MRCPv2/SIP/RTP networks protokols and tested.
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