Phone Rebooting

[pakman]

I have several phones that reboot when someone logs into their PC for the day or logs off at the end of the day. Has anyone else come across this before and found a solution?

Thanks,

[jrg0852]

Are the PCs/laptops tethered to the back of the phones, or separate network?

[ralph]

I've never heard of this.
Does it happen every time?

What type of phones are they using?
Are they on the same VLAN?
Are you using any apps such as UCA?

You may have to do a wireshark capture on that one to see what's really going on.

Ralph

[pakman]

The PC's do connect through the phones.
They are 5330's and 5340's
it's everytime according to the end user.
The phones sit on a different VLAN than the pc. The phone's receive their IP via the PBX and PC's through another DHCP server.
They do use applications but not UCA as I'm not sure what this is. They use are core applications but those are used everywhere and this is happening at only a few sites.

Thanks,

[jrg0852]

I know certain switches have a security feature on the ports that if you connect a PC to the back of the phone, it locks out that port in the switch. Could this be what is happening?

[lundah]

I remember reading something over on Tek-Tips about certain PC's (I think there were a handful of specific HP and/or Dell models) that send out a blast of IPV6 traffic on sleep/shutdown which goofs up either the L2 switch embedded in the phone or the network switch the phone is connected to. The fix was a firmware update on the PC. Maybe use WireShark to see what the PC is putting out on shutdown and startup and see if that's what's happening for you.

[pakman]

Thanks for the responses. I don't think it's a switch issue as it's not happening to all PC's at the site and they all ride the same switch. Now we did get some newer laptops and PC's and will look into the IPv6 function. Once I figure it out I will post back.

Thanks,

[jrg0852]

I uncheck the IPv6 always as it isn't deployed yet and may cause issues. Thanks.