We have had a few instances of the last few years where a phone will not get a DHCP address after an outage or some reboot reason. A lot of phones will boot up just fine and then you may have one or 2 (even Polycoms will do it) where they go into Discover or get some other error. Clearing the phone will not produce success. Moving the phone to another jack will give the phone an IP address, then you can move the phone back to the original jack and it will boot up. We have CM6.2 and the telephones are 9641Gs (on 6.2209). The Polys are 1692 and on FW 1.4. What are your thoughts on why moving a phone or Poly to another jack will work and then moving it back to the original jack it will boot up successfully? We also had one Poly where moving it did nothing, so we static IPd the phone, it booted up fine and then we removed the static information - it rebooted and grab an address...insane!