You need to recommend a solution for routing calls made to unassigned numbers. The solution must meet the companys voice requirements. What should you include in the recommendation?

A.
registrar authentication and PSTN Usage records

B.
PSTN re-routing and monitoring

C.
the Announcement application

D.
workflow agents and call detail records

Explanation:
The new Announcement application in Microsoft Lync Server 2010 makes it possible to configure how phone calls are handled if the dialed number is valid but is not assigned to a user or common area. Such calls can be transferred to a predetermined destination, or they can be answered with a recorded announcement, or both. (http://technet.microsoft.com/en-us/library/gg412802.aspx)