Drop Ad Hoc Conference: This parameter determines how an Ad Hoc conference terminates. This is an important toll-fraud prevention setting, because inside facilitators can set up a conference call to expensive international numbers and then drop out of the call. Valid values are as follows:

- Never (default): The conference remains active after the conference controller and all on-net parties hang up. This default setting could result in potential toll fraud.

- When Conference Controller Leaves: Terminate the conference when the conference controller hangs up.

- When No On-Net Parties Remain in the Conference: Terminate the conference when there are no on-net parties remaining in the conference. This distinction is important because the conference controller might have to drop out of the call, but other business partners on the call should continue the conference. The When Conference Controller Leaves option hangs up the call when the conference controller leaves the conference