“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.
R&R Telecom offers carrier-grade switch partition solutions for wholesale resellers since 2003. R&R switch partition service leverages Sonus Networks platform and provides powerful yet intuitive interface to control switch operations.