Moving phone to another jack will provide DHCP address

[demanding]

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!

 

[BIS]

You would need to check the other end? What does the DHCP server tell you. How about the arp cache on the switches?

 

[gwebster]

FWIW, the firmware on 9641G (6.2209) is quite old. It is possible that current versions may not experience the same issue.

 

[demanding]

I figured the firmware being old would come up but the issue was there even when we first put these phones out a few years ago and it is not the 9641s having the problem now - it is the 1692 Polys and yes, that is old too. Thanks for the feedback!

 

[wpetilli]

Not sure what your AVAYA footprint is, but if you are using h.248 GW's, clear the arp cache on those too and apply the 'no arp inspection' on it as well. Had a similar issue, but not exactly yours.

 

[demanding]

I'll make a note of that. The last occurrence of this was in an office with no gateway. Thanks for the follow-up!