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A conference call is a telephone call in which the calling party wishes to have more than one called party listen in to the audio portion of the call. 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 often referred to as an ATC (Audio Tele-Conference).

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 into a special telephone number that connects to a "conference bridge" (a specialized type of equipment that links telephone lines).

Companies commonly use a specialized service provider who maintains the conference bridge, or who provides the phone numbers and PIN codes that participants dial to access the meeting or conference call.

Three-way calling is available (usually at an extra charge) for many customers on their home or office phone line. To three-way call, the first person, who is the one who someone wishes to talk to is dialed. Then the Hook flash button (known as the recall button in the UK and elsewhere) is pressed and the other person's phone number is dialed. While it is ringing, flash / recall is pressed again to connect the three people together. This option allows callers to add a second outgoing call to an already connected call. <<>                                                                                                                Businesses use conference calls daily to meet with remote parties, both internally and outside of their company. Common applications are client meetings or sales presentations, project meetings and updates, regular team meetings, training classes and communication to employees who work in different locations. Conference calling is viewed as a primary means of cutting travel costs and allowing workers to be more productive by not having to go out-of-office for meetings.

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.

Business conference calls are usually hosted or operator-assisted, with a variety of features. Billing is is done through a variety of billing options.

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 if and when they wish to interact.

Party line
Conference calls can also be used for entertainment or social purposes, such as the party line or a group call. Such entertainment-based conference calls are used to provide a break from boredom as well as a way to socialize with others. People call in to a specified telephone number and are connected to conversations with other callers. This serves as a way to talk to and perhaps, subsequently, meet new people.

In the "early" days (up to 1950's-1970's in some parts of Australia) a "party line" was the only way a community could make calls. Everyone was connected to the same line and all you had to do was pick up the handset and you would be connected. In some areas, the local operator could connect you by simply plugging in the lead to your house and you could join in the conversation. Interestingly the operator was able to listen to all calls, they would cut in and tell a caller if they were approaching their allocated time for a call. The operator was often a good source of information about the community.

Flat Rate Conferencing
Flat rate conferencing services are now being offered which enable conference call users to have unlimited access to a conference bridge at a fixed monthly cost. Because telecommunication carriers offer free long distance bundled with local service, this alternative is gaining widespread popularity for budget conscious businesses and non-profits.

In the UK, there are conference services offered on a pay as you go basis where the cost of the phone calls (using 0844, 0870 or 0871 numbers) from each of the participants covers the cost of the conference service. With this service type there is no monthly charge and usually no contracts to sign.

Prepaid conference calls
Prepaid conference call services allow businesses and individuals to purchase conferencing services online, and conduct conference calls on a pay-as-you-go basis. Typically, a conference call PIN and its associated calling instructions are displayed immediately online after being purchased and/or sent via email. Generally, prepaid conference call services are used with a landline telephone, mobile phone, or computer, and there is no need to buy additional expensive telecommunications hardware or add/switch long distance service. Some services allow you to start or join a conference call from virtually any country worldwide—with appropriate telephone access.

Large telecommunications providers such as AT&T, Embarq (formerly Sprint), Verizon and other large to medium conferencing service providers maintain a dominant position in the conferencing niche; servicing many of the World's biggest brands. However, the Internet and improved global VoIP networks have helped to significantly reduce the barrier of entry into this niche.

Free conference calling
Free conference calling is the same service, with the same or better features, but without an additional fee. Free conference calling is different from traditional conference calling in that it has no organizer fees and allows for multiple people to meet for the price of their long distance connections.

How does it work? On every long distance call in the United States including toll conference calls, the consumer is paying for origination (dial tone), transport, and termination (connecting the call). Each of these phone companies share a piece of the cost of the call. This is known as Intercarrier Compensation and is intended to keep the telecommunications system functioning by having every phone company receive compensation for using their network. If it is the same phone company performing all three tasks (most likely by the two largest phone companies - AT&T and Verizon), they keep all of the charge.

In the case of conference calling (free or fee), the conferencing company receives a share of the termination fee that the local phone company receives for connecting the call. This compensation structure is used in almost every country in the world (except China, Singapore, New Zealand, Sri Lanka and a few others). More importantly, by not charging organizer fees ranging from 7 to 50 cents per minute, the free conference calling services have driven down the cost of conference calling during less than 15 years of competing with the large phone companies. ,

The Federal Communications Commission (FCC) adopted an Order on October 27, 2011 (ppg 209-226) which restructures Intercarrier Compensation and reiterates that conference calling (free or fee) is a legal service, while reducing the termination charge for high volume services such as conference calling, voice mail, call forwarding, etc. along with other changes. Under this Order and for the foreseeable future, free conference calling will continue as a legitimate and needed telecommunications service.

In most countries outside of the United States, free conference calling is done through a similar structure, or through "non-geographic" phone numbers that cost slightly more to use. In either case, there is no additional fee or charge for the conference call itself no matter how many people are on the call.

Premium conferencing
Here participants dial in on a premium-rate number such as a toll free number in the US. The conference is typically hosted by the party that perceives value in the call in order to justify the cost: this could be a business owner, a non-profit board member, an educator, lawyer, or expert in any given field. That person then usually pays for the cost of the call. Premium conferencing can also be used for charitable fundraisers.

Premium Conferencing Feature Sets
 * Reservationless or operator assisted conferencing
 * Host pin's
 * Name announce
 * Roll-call (unique and superior)
 * Moderator/participant codes
 * Live web-based call management with mute/unmute, drop one/all, and dial out
 * Recording with .wav file access through your online account
 * High-quality on-demand transcriptions (with 4-hour turnaround on request)
 * Customizable, "branded" greetings(unique)
 * Broadcast mode
 * Q&A facilitation
 * Polling and polling reports
 * Sub-conferencing
 * Dial-out with or without requested response

Common causes of poor conference calls
There are several common causes of poor quality conference calls:


 * People simply not showing up.
 * Lack of familiarity with behaviour and protocol.
 * Lack of familiarity with equipment and technology.
 * Background noise and disturbances.
 * Poor coordination by call-initiator.
 * Lack of moderator

Each of these causes requires a different kind of corrective action. However, there is usually one primary root cause; for example, people may not be showing up because the technology does not work, or the technology may not work because people are not familiar with it.

Technology problems tend to fall into two kinds: lack of bandwidth and poor equipment. Again, it is worth checking which of these apply in the case of technology problems.