Advanced concept of voice communication server on embedded platform

The paper deals with a design of an embedded Voice communication server which was developed within the scope of the BESIP project (Bright Embedded Solution for IP Telephony). The project brings a modular architecture with additional functionality such as a speech quality monitoring and a protection against security threats.The speech quality assessment is carried out in a simplified computational E-model and we implemented our proposal into the BESIP as an optional component. In the security module. We applied a standard approach to the intrusion detection and protection and in addition to the mentioned modules we come up with an idea of unified configuration based on the NETCONF protocol. We implemented ntegrated the complex support of NETCONF configuration protoco into OpenWRT and our modifications were accepted by OpenWRT community. The paper describes the inidvidual modules, their features and entire BESIP concept.Scopus892b23322

Interactive VoiceXML module into SIP-based warning distribution system

This article discusses the use of the Voice Extensible Markup Language (VoiceXML, VXML) to create a complex voice menu in danger alert communication system. The system was created as a part of research at Department of Telecommunications at the VSB - Technical University of Ostrava. Creating a voice menu provides end-users more information about the impending danger as well as instructions on how to behave in a given situation. If users receive a pre-recorded warning message in the form of a phone call, it will provide a telephone number on which they can obtain more information. In order to achieve the desired functionality, we had to use open-source PBX Asterisk, the VoiceGlue package which features both the VoiceXML interpreter and the Text-to-Speech (TTS) moduleScopus14934433

IP telephony based danger alert communication system and its implementation

The paper deals with development of a web application allowing to deliver pre-recorded voice messages by using SIP generator. The developed application is a part of complex system, which has been evolved in Dpt. of Telecommunications, Technical University of Ostrava for last three years. Our intent is focused on disaster management, the message, which should be delivered within specified time span, is typed in the application and text-to-speech module ensures its transormation to a speech format, after that a particular scenario or warned area is selected and a target group is automatically unloaded. For this purpose, we have defined XML format for delivery of phone numbers which are located in the target area and these numbers are obtained from mobile BTS's (Base transmission stations). The advantage of this aproach lies in controlled delivery and finally the list of unanswered calls is exported and these users are informed via SMS. In the paper, the core of the danger alert system is described including algorithms of the voice message delivery

Persistent homology approach for human presence detection from 60 GHz OTFS transmissions

Orthogonal Time Frequency Space (OTFS) is a new, promising modulation waveform candidate for the next generation integrated sensing and communication (ISAC) systems, providing the environment-awareness capabilities together with high speed wireless data communications. This paper presents original results of OTFS-based person monitoring measurements in the 60 GHz millimeter-wave frequency band under realistic conditions, without the assumption of an integer ratio between the actual delays and Doppler shifts of the reflected components and the corresponding resolution of the OTFS grid. As the main contribution of the paper, we propose the use of the persistent homology technique as a method for processing of gathered delay-Doppler responses. We highlight the advantages of persistence homology approach over the standard constant false alarm rate target detector for selected scenarios

Monitoring of SIP Infrastructure.

Cílem práce je popsat SIP protokol, vytvořit skript pro validaci ENUM záznamů a realizovat monitorovací systém SIP infrastruktury. První kapitola práce stručně popisuje SIP protokol a komponenty SIP sítě a představuje SIP ústřednu Asterisk. Další část poskytuje návod k použití testovacích nástrojů SIPp a SIPSAK, které jsou užitečné pro vývojáře SIP aplikací a pro testování SIP infrastruktury. Dále se zabývá popisem ENUM a SRV záznamů. Skript, který jsem vytvořil, validuje ENUM záznamy. V další částí práce je popsán systém Nagios a jeho nádstavba Centreon. Je zde uvedeno jednoduché nastavení sytému pro sledování SIP komponent v síti.The purpose of this thesis is to describe SIP protocol, to create a script for validating ENUM records and to realize monitoring system of a SIP infrastructure. The first chapter shortly describes SIP protocol and components of a SIP network and introduce a SIP exchange Asterisk. Next part brings manual for using test tools SIPp and SIPSAK, which are useful for developers of SIP aplications and for testing a SIP infrastructure. Further the work describes ENUM and SRV records. A script which i created validates ENUM records. Next part a system Nagios and its system upgrade Centreon are described. A simple setup of this system for testing SIP components in a network is written.Prezenční456 - Katedra informatikyvýborn

Systém pro sledování požadavků

Import 26/09/2007Prezenční454 - Katedra elektroniky a telekomunikační technik

Posouzení faktorů k oživení podnikatelského potenciálu firmy TATRA, a.s. Kopřivnice

Import 20/04/2006Prezenční výpůjčkaVŠB - Technická univerzita Ostrava. Ekonomická fakulta. Katedra (152) podnikohospodářsk

Improvement of network efficiency on the grounds of change communication protocol

This article deals with both theoretical and practical application of Extensible Messaging and Presence Protocol instead of different solution described detailed in the article. It uses periodically HTTP method POST to gain information about a state, which a client stands in. During this process a new connection is created and closed, what enormously makes network traffic mote intensive. Instead of this we used XMPP, this technology eliminates disadvantages of synchronous HTTP connection by its adapting for real time connection. It uses stable connection, what does not need to create it any time any information needs to be sent. It decreased amount of transported data through a network and a time, in which is a client informed about an event due to a fact, that the new solution works in real time