I have DHCP enabled on a polycom 321 and it keeps reporting a duplicate IP address. DHCP is run by a sonic wall (with a recent firmware update). No other devices (printers, computers, etc) on the network are having this issue. If I manually set all the DCHP information the phone works fine.
Phones are running BootROM 4.3.1, BootBlock 2.8.1. This happens with multiple phones.
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I would suggest to do a wireshark trace when the phone boots via DHCP as the Phone will probe the DHCP Server / Network for the given address and should show you that there is something in the network with this address already.
I am not aware of a Firmware Bug or anything at present causing this to happen.
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