Refer to the exhibit. An administrator has configured a SIP trunk between two Cisco UCM clusters. For calls that should use the trunk, the calls fail with a fast busy. The administrator checks the Cisco CallManager SDL traces and found that the cluster to which the calling device is registered never sends an INVITE to the destination cluster. The administrator also verifies that all nodes from both clusters are powered on, and the CallManager service is running. How is this issue resolved?
A. The administrator must associate the route pattern with a calling search space the device can dial.
B. The administrator needs to enable OPTIONS pings on the SIP trunks for both clusters.
C. The administrator must allow connectivity so that TCP connections do not fail between the nodes.
D. The administrator needs to disable OPTIONS pings on the SIP trunks for both clusters.
