ESS Design and Planning
90 Avaya Enterprise Survivable Servers (ESS) Users Guide
Centralized Attendant Service (CAS)
For a CAS Main system calls from a Branch will be processed if the Port Networks under the
control of the ESS server contain the incoming trunks and attendant consoles.
For a CAS Branch, calls are routed as if Night Service mode was activated. Calls are routed
only if the trunks to the CAS Main are under control of the ESS server controlling the Port
Network where attendant seeking calls arrive for service.
Crisis Alert
Crisis alerting calls can only be routed to endpoints under the control of the ESS server that
controls the originator.
CVLAN links
The ESS server will only have access to CVLAN links in Port Networks under its control.
Facility Busy Indication
Facility Busy Indicators can only track the endpoints that are under the control of the same ESS
server as the endpoint with the facility busy indicator button or display.
Hunt Groups
Hunt Group calls can be directed to hunt group members in Port Networks under the control of
that ESS server.
Leave Word Calling
When an ESS server takes control of a Port Network, all previous Leave Word Calling
messages are lost. The same is true when control is returned to the Main server(s).
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