To start with you will need the phone console logs from the 9971 first to look at any suspicious messages corresponding to the time stamp of the phone losing registration with the callmanager. A parallel packet capture from the 9971 and the Callmanager to which it is registered , covering a duration of a few minutes before the issue until the issue occurs will help as it will let us know if there are any packets which are failing to be delivered from IP phone to the CUCM or vice versa.
Its difficult to predict the cause of an issue without proper analysis of traces or captures. However, in this case we can most likely rule out CUCM as it would have affected 7962 as well in case something was wrong on CUCM. In such a situation if we can not reproduce the issue on demand to collect the packet captures from IP phone and CUCM then I would start looking at the ASA first for any dropped packets or errors.
I discovered this is happened a location only and other location Internet make the SSL VPN, then the 9971 SSL VPN would not have the problem .... The problem include "SSL VPN reconnection" and "One way audio" .... That maybe two issues ...
Otherwises, I discovered the ASA fw keep to showed the error in the logs as "asa nat/pat pool exhausted. unable to create connection"
One important point is I replace the 9971 to the 7975. The 7975 phone would not happen the two issues as the same environment.
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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 ...