Which Cisco Unified Communications Manager device report provides key information to determine if an additional gateway is needed?

The Gateway Utilization report displays the ratio of busy channels to total available channels on each gateway across a selected time period. Because it directly reveals how close a gateway is to its capacity ceiling, it provides the essential data point - utilization percentage - needed to make a justified decision about deploying an additional gateway.

Gateway Summary provides a high-level overview of call counts and durations per gateway but does not express utilization as a percentage of total capacity.

Gateway Detail lists individual call records passing through a gateway, which is useful for troubleshooting specific calls but does not indicate overall capacity utilization.

Gateway and Line Group Utilization focuses on trunk groups and line group capacity rather than providing the gateway-level utilization percentage needed for gateway capacity planning.