A conference call is a telephone call in which the person speaks to various people at the scheduled time. The conference calls are designed in two ways: one the called party can participate in the call and the other, the call is set in such a way that the party can only listen to the call and cannot speak. It is also called as ATC (audio teleconference). The conference calls are also designed in such a way that the calling party can call the other participants and add them into the call.
The companies use specialized service provider which maintains the conference bridge. The service provider can dial to the participants, connects them to the call and introduce to the parties. The operators can take the information and can also enable and disable the conference features like muting participants and muting lines. The operator can also enable the recorder feature during the conference call.