Hello all. I am experiencing a situation where all of my phones in my CUCM environment randomly reset with call manager yesterday. I opened a TAC case regarding this but the only thing we see in the event logs are phones had to register back with CUCM because of Reason=16. According to cisco this is the definition:
ReasonCode 16: DuplicateRegistration. This means that Cisco Unified CallManager detected that the same device was registered on two nodes at the same time. When this happens, Cisco Unified CallManager sends a restart request to the phone to force the phone to register with only one Cisco Unified CallManager
I cannot figure out why this happened. In our environment we have one CUCM server and a 2911 gateway that acts as a SRST box. We did shut the gateway down to install a FXS card the evening before this started happening. This box also acts as the DHCP server for the phones as well. Call manager did not go down during this install but could this have triggered the phones to register with the SRST box somehow? It has not happened again since the restart yesterday.
I have seen cases where too much broadcast traffic choked out the keep alive by the phones. Then random phones at random times would reset. This could have been similar to your issue, when you brought the SRST router back up.
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 ...
This document describe how DST changes and how time changes are
implemented in DST. Daylight Saving Time (DST) is the practice of
setting the clocks forward 1 hour from standard time during the summer
months, and back again in the fall, in order to make b...