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IP Telephony Systems
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The Internet telephony system consists of call terminating devices, gateways, gatekeepers or proxies and multi-point conference units. Call terminating devices can be traditional telephones or audio-equipped computers. Gateways are used for transmission conversion of calls into a format transportable over the Internet. Gatekeepers provide centralized call management functions such as call admission, bandwidth management, address translation, and call authentication and user location. Multi-point conference units manage multi-party conferences. The functions of the above components may be met through software or hardware and may be integrated into single units. These components communicate with each other using voice-transporting protocols.
Read more at: http://ezinearticles.com/?IP-Telephony-Systems&id=270165.
 
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