Cisco TelePresence Administrator's Manual page 159

Clustering and peers
About clusters
Secure communication between peers
The VCS uses IPsec (Internet Protocol Security) to enable secure communication between each cluster
peer. Authentication is carried out through the use of a pre-shared access key.
Each peer in the cluster must be individually configured with the IP address and associated access key of
every other peer in that cluster.
Cisco VCS Administrator Guide (X8.1.1) Page 159 of 507