This capability eliminates the dial tone that the user usually hears while the user adds the participants to the conference call. A user uses the No Dial Tone Conferencing capability to add existing calls to a conference call. The user does not need to select a line appearance if there is someone on hold, or if the system is alerting a line appearance.

For example, a user places a call on hold, and talks to another party. When the user presses the conf button and then presses the button of the call on hold, the party on hold joins the conference without hearing a dial tone.