“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.
Internet Solutions Alliance
Internet Solutions Alliance Inc., in Ontario, Canada, is an international communication provider over a foremost Voice over Internet Protocol (VoIP) technology. Using an existing high-speed Internet connection, ISAs technology enables anyone to make and r
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