Cisco TelePresence Administrator's Manual page 251

Recommendations
VCS Expressway and VCS Control: the recommended configuration for a VCS Expressway when
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acting as a traversal server for a VCS Control is to enable the PUA and disable the Presence Server on the
VCS Expressway, and enable the Presence Server on the VCS Control. This will ensure that all PUBLISH
messages generated by the PUA are routed to the VCS Control.
VCS neighbors: if you have a deployment with two or more VCSs neighbored together, you are
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recommended to enable only one presence server per domain. This will ensure a central source of
information for all presentities in your network.
VCS clusters: for information about how Presence works within a VCS cluster, see
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Presence.
Note: any defined transforms
Presence Services.
Cisco VCS Administrator Guide (X7.2)
also apply to any Publication, Subscription or Notify URIs handled by the
Applications
Clustering and
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