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VOIP
VoIP stands for Voice Over Internet Protocol. As the term says VoIP tries to let go voice (mainly human) through IP packets and, in definitive through Internet. VoIP can use accelerating hardware to achieve this purpose and can also be used in a PC environment.
Many years ago we discovered that sending a signal to a remote destination could have be done also in a digital fashion: before sending it we have to digitalize it with an ADC (analog to digital converter), transmit it, and at the end transform it again in analog format with DAC (digital to analog converter) to use it.
VoIP digitizes voice in data packets, sending them and reconverting them in voice at destination. Digital format can be better controlled: we can compress it, route it, convert it to a new better format, and so on; also we saw that digital signal is more noise tolerant than the analog one (see GSM vs TACS). TCP/IP networks are made of IP packets containing a header (to control communication) and a payload to transport data: VoIP use it to go across the network and come to destination.
Voice (source) >> ADC >>> Internet >>> DAC >>> Voice (dest)
When you are using PSTN line, you typically pay for time used to a PSTN line manager company: more time you stay at phone and more you'll pay. In addition you couldn't talk with other that one person at a time.
With VoIP you can talk all the time with every person you want (the needed is that other person is also connected to Internet at the same time), as far as you want (money independent) and, in addition, you can talk with many people at the same time. VOIP is also being used in conjunction with HotSpots and Interactive Games such as Xbox.
The Toronto Wireless User Group is a member of the Oreilly User Group Program.
Vist the Oreilly site for a 20% discount on any title.
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2006 Wireless & Mobile Expo & Conference
June 7-8, 2006, National Trade Centre, Toronto, Canada
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The 2006 Wireless & Mobile Expo and Conference attracts key decision-makers to learn and purchase the latest products and solutions, offered by innovative technology vendors and service providers. Focusing on the latest wireless and mobile technologies and their enterprise applications, the 2006 Wireless & Mobile Expo and Conference will focus on many hot topics, including Wi-Fi, RFID, Wireless Broadband, Mobile Computing, VoIP, WiMax, Wireless Security, Mobile Devices and many others.
To qualify for FREE Passes, please contact 1-416-292-0038 ext. 821 or visit:
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