[cisco-voip] IP phones and DHCP

[Marc Hering]

I've noticed that behaviour also on my 7960's...

-----Original Message-----

Lastly, one behavior of the phones breaks DHCP altogether.  If a phone
once received an IP address from a dhcp server but then can no longer
talk to the server at renewal time (or at startup if it has an old
network config
stored) it keeps the IP address it once had.  This behavior might or
might not be good for the phone, depending on the circumstances, but it
is certainly bad for the network.  What if that IP address is reassigned
by DHCP to another client?  The correct behavior, as implemented by
every other DHCP client device out there, is to release the IP address
if a renewal is not given by the DHCP server.