What is the default value for the Drop Ad Hoc Conference service parameter? (Source:Preventing
Toll Fraud)

A.
Never

B.
When No On-Net Parties Remain in the Conference

C.
When No Off-Net Parties Remain in the Conference

D.
Drop Ad Hoc Conference When Creator Leaves

Explanation:
To use the additional functionality that advanced ad hoc conferencing provides, Cisco recommends
that you set this service parameter to Never. Any other setting can result in unintentional
termination of a conference.
Link:
https://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/8_6_1/ccmsys/a05confb.html