“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.
Cierra Communications LLC
Cierra Communications LLC broadens executive bandwidth by providing results oriented professional services, marketing communications, carrier services and products to the telecom, networking and enterprise industries.
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