“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.
InfiniRoute Networks Inc. provides fully managed Voice over IP (VoIP) peering services for wireline and wireless carriers who need PSTN-quality VoIP connections to high-growth traffic regions worldwide.