Phones rebooting constantly

Good thought but we have no control over the DHCP lease time - It is coming from a Linksys firewall/router which is providing IP's to the rest of the network - without problems and certainly longer than a few seconds.

We also tried setting a static IP address, but that didn't make any difference, as even with the static address, as soon as we connected the network cable it rebooted.

We did track the issue down to potentially being a switch issue - if we plugged the phones directly into the main switch, they would not reboot, if we plugged them into a secondary switch, hanging off the main one, they rebooted.

I've never seen anything like this before on a network though, but it must be some funky packet that is causing the units to reboot. Not sure if this is a firmware issue or something that Aastra should be looking into..

You'll need to gather the following information and open a ticket with support. I know you probably don't need such

1. Switch model and firmware version
2. Any pertinent switch configuration - network related settings
2. A simple diagram of your network configuration - showing how the various boxes are connected on your network (eg if the phone is connected directly to the problematic switch)
3. An Ethernet capture of the the messages that are being sent to the phone on startup
(a) Install Wireshark on a PC
(b) Find a hub and connect your PC and phone to it and plug the uplink into the problematic switch
(c) If you don't have a hub, just plug the PC directly into the switch and capture the packets when it gets a DHCP address (this might help a bit but not overly likely)
4. Any configuration settings your using on the phone. After the factory default did you point the phone back at your configuration server?
5. Details of when in the startup process the phone reboots - ie what's displaying on the screen
6. Any changes that could have triggered the reboots starting - eg network changes, configuration changes, firmware upgrades, etc.
7. Now that you've got the phone connected again, are there any crashes reported on the troubleshooting page? If so, then include the crash log file.

Once you've done that, PM me the ticket number and I'll have a look.

FYI the DHCP issue that nizon mentioned only happens if the lease time is really huge (in the region of 10 years+) and I've never see a lease like that from you basic home router/firewall.