When many people are on the line at once, it is termed a conference call (also known as an audio teleconference, or ATC). The conference call may be set up so that the called party can take part in the call or so that they can just listen in and not take part in the conversation. It is. On residential and business phone lines, three-way calling is restricted and often costs more. Dialing the first party in a three-way call is standard practice. Pressing the hook flash button (also known...
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