mmm i gotta be honest, at least i've never heard that it would go from unregistered to unknown after X time. You might be right but it would take some time to go into the lab and see if it happens overnight.
If someone else has witnessed that behavior feel free to comment.
Hope you are all doing well! I have seen phones transition from Unregistered to Not Found/Unknown many times. It does take a fair amount of time after being disconnected for this to happen. How long is "fair", I'm not really sure either ;-)
It's cetainly not overnight, but it may be the length of the DHCP lease. I just checked on a phone I disconnected about 3 weeks ago and it now shows the Unknown state. I believe if CUCM is re-booted when the phone is disconnected it changes state as well.
Maybe we should all do a test and report back. I just unplugged one of my Lab phones, so I'll keep an eye on it and see when it changes.
Just to update, the 7942 that I unplugged on August 20th has now transitioned to "Not Found". Our DHCP lease is one week so I'm guessing that if the IP Phone is unplugged when the renewal comes up it moves to Not Found/Unknown.
A phone that has never been registered to call manager would definitely be in Unknown status. But, a phone that was registered to the call manager at some point of time can be in Unregistered or Unknown status depending on a service parameter in the "RIS Data collector" service.
This parameter specifies the RIS database information storage period for any unregistered or rejected device information from the Cisco CallManager service. After the time specified in this parameter expires, Cisco CallManager removes the expired entries during the next RIS database cleanup time (specified in the RIS Cleanup Time of the Day parameter)
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The short answer is that you don't.... That isn't entirely true while at
the same time it kind of is, but for the most part you don't configure
the softkeys. You enable or disable them via TCL. Here is the long
answer. Be sure to read the whole thing or e...
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 ...