“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.
AirTouch WiFiVoIP enable you can enjoy the best of both world, seamlessly. Enjoy the affordable AirTouch WiFiVoIP network when you are within WiFi range and automatic forward calls to your GSM network otherwise. In fact both WiFiVoIP and GSM will work at