423 research outputs found
Designing and optimization of VOIP PBX infrastructure
In the recent decade, communication has stirred from the old wired medium such as public
switched telephone network (PSTN) to the Internet. Present, Voice over Internet Protocol (VoIP) Technology used for communication on internet by means of packet switching technique. Several years ago, an internet protocol (IP) based organism was launched, which is known as Private Branch Exchange "PBX", as a substitute of common PSTN systems. For free communication, probably you must have to be pleased with starting of domestic calls.
Although, fairly in few cases, VoIP services can considerably condense our periodical phone
bills. For instance, if someone makes frequent global phone calls, VoIP talk service is the
actual savings treat which cannot achieve by using regular switched phone. VoIP talk services strength help to trim down your phone bills if you deal with a lot of long-distance (international) and as well as domestic phone calls. However, with the VoIP success, threats and challenges also stay behind. In this dissertation, by penetration testing one will know that how to find network vulnerabilities how to attack them to exploit the network for unhealthy activities and also will know about some security techniques to secure a network. And the results will be achieved by penetration testing will indicate of proven of artefact and would be helpful to enhance the level of network security to build a more secure network in future
ACUTA Journal of Telecommunications in Higher Education
In This Issue
To VolP or Not to VolP
Preparing Your Campus for a VolP Conversion
Strategic Planning in the College and University Ecosystem: The Common Denominators
Advertorial:
Going Wireless at Fiber Speeds
Open-Source VolP for Colleges and Universities
Institutional Excellence Award Honorable Mention The Naval Postgraduate School
Interview
President\u27s Message
From the Executive Director
Here\u27s My Advic
A methodology for measuring voice quality using PESQ and interactive voice response in the GSM channel designed by OpenBTS
This article discusses a methodology for rating the quality of mobile calls. Majority telecommunications service from the perspective of the whole world is using mobile telephony networks. One of the problems affecting this service and its quality are landscape barriers, which prevent the spread signal. Price and complex construction of classic BTS does not allow their dense distribution. In such cases, one solution is to use OpenBTS technology. Design of OpenBTS is more available, so it can be applied to much more places and more complex points. Purpose of this measurement is a model for effective stations deployment, due to shape and distribution of local barriers that reduce signal power, and thus the quality of speech. GSM access point for our mobile terminals is OpenBTS USRP N210 station. The PESQ method for evaluating of speech quality is compared with the subjective evaluation, which provides Asterisk PBX with IVR call back. Measurement method was taken into account the call quality depending on terminal position. The measured results and its processing bring knowledge to use this technology for more complicated locations with degraded signal level and increases the quality of voice services in telecommunications
ACUTA Journal of Telecommunications in Higher Education
In This Issue
Wireless Outlook 2012
802.11n Wireless in the Enterprise- The Next Big Change
The University of Tulsa: A Wireless Campus
Advertorial: Deploying Media Switching Systems for Educational lnstitutions
Faster Wireless LAN Connections May Help Support Voice & Video Traffic
Wireless at Syracuse
Expectation Versus Experience: The Realities of Life on the Wireless Road
lnstitutional Excellence Award Honorable Mention UC Mobile
Interview
President\u27s Message
From the Executive Directo
Creation of value with open source software in the telecommunications field
Tese de doutoramento. Engenharia Electrotécnica e de Computadores. Faculdade de Engenharia. Universidade do Porto. 200
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