“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.
Many phone companies offer "cheap" long distance call rates. However, Dukatech goes beyond that, by helping individuals, organizations and business clients get the true value of their money.