Conference Call

Conference call is a term used for phone calls that connect three or more phone lines at the same time. Conference Call allows phone users different locations to communicate and exchange information. Conference Call can be arranged so that the parties are called to participate when a phone call made or just listen to the conversation and can not come to speak. Conference Call is often called the ATC (Audio Tele-Conference). Conference Call types included in the teleconference.

How it Works
Conference Call held in the distribution process. In one embodiment, the implementation of the admissions process includes a set of audio signals from the conference call subnodes. Telephone audio signals are then corresponded with the recipient's phone calls so as to produce a set of audio signal output from any telephone call received audio signal, then transmits it to the conference signals a set of subnodes. A node is a conferencing node that can improve the sound quality of each participant phone that is connected by way of eliminating the audio input of the output audio conference call participants [3]. This can improve the clarity of the audio signal and eliminating sources of echo. Public switched telephone networks or dedicated private networks and the central instrument called a bridge used to link participants' Conference Call. Microphones and loudspeakers can be used to make a group call.

How about Quality
Conference call that good quality is often difficult to achieve. The cause of the most significant is the technology. Participants may not turn up in a conference call because the technology impaired. In contrast, the technology would not be effective if the participants do not usually come into contact with technology. Problem about technology tends to come from two things, namely the lack of bandwidth and communication tools that are less qualified.

The Applications
Conference Call main function to help smooth business communication, ranging from corporate business to business import export Syarifah banking. Business people use conference calls to connect with the remote parties, both the internal and external parties. The most common applications are client meetings, sales presentations, project meetings, training, and communication between employees working in different places. Conference Call can also be social and entertainment functions, such as group call and the party line. In Indonesia, conference call services provided by various mobile phone operators such as Telkomsel and Indosat.