Conference calls can be designed so that the calling party calls the other participants and adds them to the call; however, participants are usually able to call into the conference call themselves by dialing a telephone number that connects to a "conference bridge" (a specialized type of equipment that links telephone lines). Conference calls are used by nearly all United States public corporations to report their quarterly results. These calls usually allow for questions from stock analysts and are called earnings calls. A standard conference call begins with a disclaimer stating that anything said in the duration of the call may be a forward-looking statement, and that results may vary significantly. The CEO, CFO, or investor relations officer then will read the company's quarterly report. Lastly, the call is opened for questions from analysts. Conference calls are increasingly used in conjunction with web conferences, where presentations or documents are shared via the internet. This allows people on the call to view content such as corporate reports, sales figures and company data presented by one of the participants. The main benefit is that the presenter of the document can give clear explanations about details within the document, while others simultaneously view the presentation. Care should be taken not to mix video and audio source on the same network since the video feed can cause interruptions on sound quality It is important to pay attention to conference call etiquette when participating; for example, one should refrain from shouting, multitasking in certain cases, and using an unpleasant tone. Care should also be taken to schedule a call at a convenient time. Business conference calls are usually hosted or operator-assisted, with a variety of features. Conference calls are also beginning to cross over into the world of podcasting and social networking, which in turn fosters new kinds of interaction patterns. Live streaming or broadcasting of conference calls allows a larger audience access to the call without dialing in to a bridge. In addition, organizers of conference calls can publish a dial-in number alongside the audio stream, creating potential for audience members to dial in and interact. A conference call is a telephone call in which someone talks to several people at the same time. The conference calls may be designed to allow the called party to participate during the call, or the call may be set up so that the called party merely listens into the call and cannot speak. It is sometimes called ATC (audio tele-conference). In the case of free conference calling, the conferencing company strikes an agreement with the local phone company that hosts the conferencing bridge to receive a share of the terminating access charge received for connecting the call. At large carriers such as AT&T and Verizon, they keep these access charges for their own conferencing services in addition to charging the customer for the conference service. With free conference calling, as mentioned above, there are no organizer fees so these services do not double-dip: the consumer pays for a regular call with the same three components – origination, transport, and termination – of any call. In other words, the call costs the same as any other call under the customer's calling plan, but the conferencing is included for free to the host and participants of the conference call. This added competition in the conferencing market has brought average rates down from over 20 cents per minute to under 10 cents per minute. In addition, it is more efficient and less expensive to speak to many people on one call (a conference call) than on multiple person-to-person calls.

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