You support a Microsoft Lync Server 2013 on-premise environment that includes the following:
• An Enterprise Edition Front End Pool with three Front End Servers
• A mirrored back-end SQL database
• Both the Front End Pool and Edge Pool use hardware load balancers (HLBs)
• An Edge Server pool with two servers in perimeter network
The Lync environment supports 10,000 users in High Availability mode.
Some users report that they are unable to make outbound calls to specific public switched telephone
network (PSTN) numbers. When they attempt to do so, the call appears to be connected but then
drops with a reorder tone, and then they receive the following error message: “Due to network error
your call cannot be completed at this time. Please try your call again.”
You need to troubleshoot the issue. Which centralized logging scenario should you use?

A.
HybridVoice

B.
incomingAndOutgoingCall

C.
LYSSAndUCS

D.
MediaConnectivity