We just added an IP phone system to our network (NW6.5sp3) and now we're
getting squirlly issues with the phones dropping off. The error on the
phone is that they can't obtain an IP address from the DHCP server.

Our leases are set to expire 15 hours after getting it. The range for
both CPUs and phones is enough. I have 120 availible addresses, but only
90 devices needing DHCP addressing.

The phone tech said that it appears that DHCP is set to change addresses
upon getting a new lease and not just giving out the old one. Is there a
way to make sure that DHCP is sticking with the same IP address as they

thanks in advance for your help!