Extentions
“Extension” - is the extension of the telephone line (PBX) or the Centrex system. It works as an association and allows calling to certain telephone sets without the necessity of dialing the telephone number, but only by dialing a short combination of digits, reaching the desired subscriber.
The common name shared by communication protocols, technologies and
methods ensuring the transfer of the voice signal via the Internet network or
by any other IP-networks. The signal is transferred by the communication
channel in the digital form and, as a rule, before transferring compresses in
order to remove abundance.
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