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 increase employee efficiency and productivity, and provide a more cost-effective way to hold business meetings. A variety of Conference Call features include individual management of conference call activity, integrated audio and web conferencing, multiple conference rooms, call record history and online call scheduler.

VoIP conferencing is an ideal way for people to meet and collaborate when face-to-face meetings are not practical, cost-effective or feasible.

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.