I have a remote site on which the IP phones keeps rebooting very often, I believe keepalive packets are losing often. Is there any tool where I can check what exactely causing this issue? because my Softphone works fine, but only the hard phones 7940/76960 keeps rebooting in the recent days, I have 15 IP phones in the remote location. Any help would highly appreciated.
I am in a similar position to the original poster of this question. Symptoms seem to only occur when a machine with a 10/100/1000 NIC is also in the loop.
How would you measure whether or not the PoE is overloaded? Do I really need to get the ampmeter out?
Reading around the 802.3af (2005) standard there seems to be a validation by the switch to see if power is needed. Apparently the circuit checks to see if the resistence on the circuit is between 15 and 33 kilo ohms. My current investigations are looking at whether or not the Gb NIC is adding resistence to the circuit.
I would interested to hear from anybody that may have had to measure this
Thanks for the suggestion, but I also did a firmware upgrade but still the phones keeps rebooting. I am using 3Com switch & I have connected a separate power adaptor too for the phones. Below is the output of the debug in the one of the IP phone. Rebooting happens when I try calling some extension or receiving calls, transfer & so on. Rating for the your answer will be depend with the suggestion you provide.
I still suggest that it is PoE related but do not know how to prove it.
In your situation activity on the phone could be putting additional load on the PoE circuit. The additional load then causes the amps, watts, volts, etc.. to drop below a tolerance threshold on the phone causing it to reboot. But this is all theory which I need help in proving/disproving.
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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 ...