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VoIP Presentation

Great Idea of Computing

Khanh Nguyen

on 13 November 2012

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Transcript of VoIP Presentation

IP Phones
Computer-to-computer VoIP Connections How does VoIP work? A technology that enables one to make and receive phone calls through the Internet instead of using the traditional analog PSTN (Public Switched Telephone Network) lines. What is VoIP ? VoIP
Disadvantages Future of VoIP of VoIP Nowadays Started in Feb 1995
in Isreal -
Vocaltech, Inc Late 2001 Runs on home PC,
Only computer-to-computer calling

Low quality customers had to listen to advertisements before and after the call In 1998, entrepreneurs saw potential in VoIP technology Offered computer-to-phone and phone-to-phone calling 2000 VoIP Switching Hardware invented
Route and switch VoIP traffic --> VoIP hardware less computer dependent Established firms able to set up VoIP on their internal IP networks Better quality for VoIP calls Reduces voice delay Better audio codec transfer Runs concurrently with web browser VoIP companies charge users flat monthly subscription fee

Calling cards are available three two one Dependence on Electricity Emergency Calls Quality room for development Innovation Vo4G VoWi-Max VoLTE Language Interpreter Authentication 3D Hologram Chatting (cc) photo by theaucitron on Flickr (cc) photo by theaucitron on Flickr HISTORY HISTORY HISTORY HISTORY HISTORY HISTORY HISTORY HISTORY EVOLUTION HISTORY Future of VoIP Future of VoIP Future of VoIP Future of VoIP Future of VoIP Future of VoIP Security four Need power by battery, electricity, PoE

Vulnerable when blackout occurs Cannot be traced geographically by IP address Affected by latency, noise, packet loss

Device dependent Viruses, trojans

Hacking, sniffing Towards
BUSINESS enhanced connectivity and changes the way we communicate add an addition dimension for social networking
(more interactiveness) provide much richer features than conventional PSTN cheaper when compared to oversea calling via PSTN accessible to individual like you and me For small business: virtual PBX For large companies: PSTN with VoIP The 1-2-3s of VoIP working are:
Compression: The analog signals from recorded voice are digitized and compressed using CODEC into many sound samples.
Encapsulation /Packetization: These compressed sound samples are collected together and packed into data packets.
Routing: The encapsulated data packets are routed through different routers to their respective.
After reaching the destination the data packets are then decoded and converted back to analog sound. BASIC UNDERSTANDING Virtual PBX Save on hardware VoIP & PSTN Hybrid Cross-region 1995 1998 Started in Feb 1995 in Israel
Vocaltech, Inc
VocalTec Internet Phone slow internet connection poor audio codecs Broadband Connection Flexible Thank you! 2000 2001 1 2 3 4 5
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