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 service allows the user defining the criteria, by which the signal of a certain incoming calls will sound different from the standard signal of the telephone call.
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