Exam 350-801 topic 1 question 171 discussion

D Drop Ad Hoc Conference, prevents toll fraud (where an internal conference controller disconnects from the conference while outside callers remain connected). The service parameter settings specify conditions under which an ad hoc conference gets dropped.

D is correct

ad hoc conf restriction prevents Toll Fraud

D is the right answer

I would say D. Configuring drop ad hoc prevents toll fraud. https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/12_0_1/featureConfig/cucm_b_cucm-feature-configuration-guide_1201/cucm_b_cucm-feature-configuration-guide_1201_chapter_010000.html

Drop Ad Hoc Conference, prevents toll fraud (where an internal conference controller disconnects from the conference while outside callers remain connected). The service parameter settings specify conditions under which an ad hoc conference gets dropped. Never—The conference does not get dropped. (We recommend that you use the default option to avoid unintentional termination of a conference). When No OnNet Parties Remain in the Conference—The system drops the active conference when the last on-network party in the conference hangs up or drops out of the conference. Unified Communications Manager releases all resources that are assigned to the conference. Note Drop Ad Hoc Conference feature in an ILS deployment will not drop the parties when it set at When No OnNet Parties Remain in the Conference because the route patterns learned are classified as On Net. When Conference Controller Leaves—The active conference terminates when the primary controller (conference creator) hangs up. Unified Communications Manager releases all resources that are assigned to the conference.