“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.
Coolwave Communications BV is a Netherlands-based telecom operator serving the rapidly growing market for voice,voice-mobile, VOIP, internet, data and fiber services.