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.
Is a device, which converts telephony traffic into IP for transmission over a data network. It supports real-time audio, video and data information.
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