IP Telephony Based Danger Alert Communication System and Its Implementation

Filip Rezac,Karel Tomala,Jakub Safarik,Jan Rozhon,Jiri Vychodil,Filip Kolenovsky,Martin Mikulec,Miroslav Voznak

doi:10.15598/aeee.v10i4.711

Abstract

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.

Highlights

Our system is based on using SIP call generator to generate and distribute voice messages directly to the end device (IPphone, cellphone, fixed line, etc.), [1]
The output of the application are SIP messages which are sent into communication server, it can be based on opensource softswitch, such as Asterisk or OpenSIPS [2], [3]
We developed a system which can distribute voice messages in the form of telephone calls using VoIP technology and SIP protocol fast and efficiently

Summary

Introduction

Our system is based on using SIP call generator to generate and distribute voice messages directly to the end device (IPphone, cellphone, fixed line, etc.), [1]. The benefit of such communication compared to others is the fact that it uses a phone call and it is possible to get feedback who accepted the message and to improve efficiency of alert system. A staff member logs into the system created by us, loads the prerecorded alert and other parameters and sends the request. The softswitch processes the messages and starts initiating calls to the end users according to the predefined parameters. If the end user does not answer the call (missed call, phone switched off), the system arranges to re-send the message and re-initiate the call with the end user concerned

Technology

Method

Features

Conclusion