Audio conferencing is by far the most common method of telecommunication conferencing worldwide. Audio conferencing allows workers and bosses in charge to collaborate with each other on each day’s tasks or conduct an important business meeting between the associates of the corporation through a simple communication method. These can be toll free between two or more exclusive phone lines previously selected, local dial in conferences which are conducted through a complete hall of reunited people dialing to another hall on another place in the same city and international, to any part of the world. These can be or not be controlled by an operator.