Another vendor did the implementation IPCCX Express version 5.0.X and after to do the Window maintenance I verified that the redundancy didn´t work. Are there the specific configuration to do in IPCCX to redundancy to work? I verified that when I disconnect the cable The IPCCX Principal the IPCCX Backup work. This behaviour is normal? The redundancy only work when there is physical down the IPCCX Principal?
If it's a network issue, then no, the Engine will continue to think that it's the master, and the secondary node will then elect itself master. They call this island mode. A proper failover scenario is when one engine stops/crashes, and the other node detects this, then the secondary node becomes master. When the primary node recovers, it remains inactive until you force it, or the secondary engine stops/crashes.
If in the Control Center you see both nodes listed, then more than likely the vendor set it up correctly.
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The short answer is that you don't.... That isn't entirely true while at
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Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...