abc.com’s Bicycles has three manufacturing plants and 145 retail stores. Each of the manufacturing plants has a Cisco Unified CallManager cluster. The retail stores use a mix of Cisco Unified CallManager Express and key systems with gateways. What is the recommended trunk type to use on the Cisco Unified CallManager clusters for full intersite calling capability?

A.
gatekeeper-controlled interclustertrunks

B.
gatekeeper-controlled H.225 trunks

C.
non-gatekeeper-controlled intercluster trunks

D.
SIP trunks

Explanation: