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Phones registered properly to Cisco CallManager show the Unknown status in the Attendant Console
This issue can be caused by a firewall installed on the PC that runs Cisco CallManager Attendant Console, or by issues related to Telephony Call Dispatcher (TCD), Computer Telephony Interface (CTI) services, or an improper Attendant Console upgrade.
Use one of these options to resolve this issue:
Verify that there is no firewall installed or running on the Windows PC or the system that also runs Attendant Console.
Execute the ciscocmac-fmu.exe file on every server in the cluster to update the TCD service used through the Attendant Console.
Verify that the CTI Manager is installed and runs on all servers that perform call processing.
Verify that the Attendant Console user has a check next to Enable CTI Super Provider. If not, check Enable CTI Super Provider and click Update.
If these solutions do not help, restart the TCD and CTI services.