How should an administrator configure Cisco Meeting Server to limit the number of participants of all conferences to 10?

Refer to the exhibit. What does this notification indicate about activity over the last 90 days?
In a cluster of Cisco Meeting Servers, one of the peer servers has the FQDN CMS1.local, and the web admin is running on 445. Which server address must be configured in the clustered Call Bridges page?
What is the purpose of the Call Bridge service within Cisco Meeting Server?