I have a customer that has been plagued with an annoying problem for a couple months now. We have had a TAC case open with Cisco and haven't been able to get anywhere with them. Here is the issue.
Periodically (at least once a day), a small group of phones registered to CUCM 7.0.2 reboot themselves with no administrator involvment. Now at first I thought it was a network problem (missing keepalives), but further investigation into the QoS configuration showed that there were no packet drops in the priority or call control queues and that MOS scores throughout the network were averaging 4.43 with a low score of 4.3. Second I considered the possibility of a firmware bug (8-5-2s) however the issue happens to different phones everyday and not necessarily the SAME phones. The issue moves around the network affecting different phones one day and other phones another day. The only thing that we have been able to identify is that the syslogs show transient connection errors and it seems to be around 9:00AM and 9:00PM when the phones lose connection. Any ideas that anyone might have are GREATLY appreciated. Thanks for taking the time to read and consider.
Brandon - I didn't even think about that as a possible cause. I will look into it and post my findings. Thanks for the input!
P.S - should I be looking for anything particular in the command output of the switch? I'm not real familiar with the PoE configuration in the switch...just know that they will only provide as much power as the device needs.
Also if you need to change the POE Wattage used by the phone you can do this below:
A powered device might use more power than set by the power inline consumption command, so you must carefully make adjustments to the power budget. An accurate power budget protects the switch from an overcurrent condition.
In this example, the power budget is manually adjusted to 4 W on a specific port. When a Class 3 phone was connected, it required more power than 4 W:
Thank you for your input. I carefully looked at the configuration of the PoE switches and found that the IP phones were always drawing the correct amount of power according to Cisco documentation. I took your recommendation and used the "power inline never" interace command to shut off PoE on non IP phone ports.
I'm currently experiencing the same issue running off of CUCM Business Edition version 7.1(5). We've checked the network, CUCM configurations, power, etc. I notice that about 6 random phones reboot once or twice sporadically within the span of about 2 hours. This happens once every couple of days. We are currently running packet captures and have a TAC case open.
Did you happen to find the cause of this issue?? Thanks!
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 ...
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