“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.
IPgrade
IPgrade LTD, was formed as a wholesale provider of international voice services specialized in VoIP and advanced telecommunications solutions.IPgrade owns, operates and maintains communications infrastructure worldwide, providing high quality services and
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