I've got a Mitel phone that is stuck in DHCP DISCOVERY. It is located in another building. That building is connected to the main building with a fibre link using a fast ethernet media converter The network map is shown below.
I have tried other phones and they dont work however if I take the phone back into the office it works fine.
I've called Mitel themselves and they have no idea what could be causing this. HP advised to try turning spanning tree off but this is all to no avail. The only other intelligent device in between is the Linksys SRW208P. I have upgraded the firmware, reset to factory defaults with no success.