CMS HA servers do not have to be physically located in the same building, or even in the same city.

CMS HA computers can collect data from up to eight different ACD Communication Manager systems. The server does not support mixed ACD links that combine single ACD links with HA dual links. Mixed ACD links can cause significant call data loss and fill system error logs with meaningless data.

All link connections operate through the TCP/IP over Ethernet LAN protocol. Ensure that connections run over LAN facilities that are local to the Communication Manager system.

Connect each CMS HA server to a separate UPS on a separate protected power circuit.

Dual control C-LAN circuit packs or Ethernet ports on the Communication Manager system handle ACD traffic routing. Administer the Communication Manager system to enable the dual control C-LAN circuit packs or Ethernet ports. For details about the administration of dual ACD links on HA configurations, see the section on administering a Communication Manager system link in Avaya Call Management System and Communication Manager Connections, Administration, and Troubleshooting.