Which three of these are characteristics of multicast music on hold? (Choose three.)

A.
It uses one-way RTP point-to-point.

B.
There is a single user per audio stream.

C.
Networks and devices have to support multicast.

D.
It increments by IP address for different audio sources.

E.
It uses the multicast group address 239.1.1.1 to 239.255.255.255.

F.
It uses enterprise parameters to set the codec type or types used by music on hold services

Explanation:
Incorrect Answer : ABF

66
Cisco 642-447 Exam

Explanation : In multicast scenario A& B is absolutely wrong. Cisco recommends using an IP address in the range that is reserved for administratively controlled applications on private networks (239.0.0.0 to 239.255.255.255)
Link : http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/8_5_1/ccmfeat/fsmoh.html Reference : Cisco Unified Communications Manager Features and Services Guide for Cisco Unified communications Manager Release 8.5(1), page-1002