“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.
TELTUB Inc. is a provider of unprecedented phone services to consumers and small businesses. TELTUB phone services can interact, in real-time, with other messaging technologies and platforms.