Running IP phones with inline power (6.3v from the switchports i believe).
It's only the 7960 phones which seem to reboot at random.
Recent change to Callmanager v3.3 settings was to set 'MaxLoginTime' for Extension Mobility to 'False' - thus allowing Ext Mob users to remain logged into an IP phone for eternity (theoretically :) Issues with the reboots seem to have happened after this (if i am to believe the users!)
The local switch shows a few ports with tx and rx errors, and some runts. However, several phones have been reported as having 'rebooted' yet only two ports have these tx/rx errors.
Cisco support site lists some vulnerabilities for IP phones when XML is pushed to them/hackers causing DOS attacks etc. Given that all our kit is behind firewalls (and we are on a later version of CallManager that the DOS issue apparently doesnt affect) then i'm not so sure the DOS issue is relevant.
Any thoughts...? Seems a bit odd and random - the worst type of possible network/phone issue!! lol
I would go to the phones menu -> Setting->status-> and check status and Networkstatistic after or during the Phone is rebooting. Second thing is to activate traces on CCM (SDI,SDL) and see what s causing this problem.
If you have a POE switch, try using a power supply with the 7960 that is having an issue just to see that its not a power issue. I have also had an issue with CAT cables being the issue. (bad patch cables, etc) The phone will try and negociate a switch port speed (10/100) when the port is set to Auto and phone on auto. IF the there is confussion between with the switch or lost packets, the switch may try and re-negociate a connection with the phone port, hence the POE drops, reboots the phone and reconnects.
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