Alex Robar wrote:
Hi everyone,
I've got a couple of remote phones (Polycom SPIP 501's) that are causing
me headaches today. The IP address of the Asterisk box they register to
has just changed. The DNS entry they were using has changed to reflect
the new IP. For some reason or another, using the old A record doesn't
work anymore. If I change the registration server to the IP instead of
the DNS name, it works fine, so I know the phone is OK. If I query DNS
from whatever upstream provider the phone is on, it correctly returns
the new IP. It seems to me that these phones have got to be caching the
DNS record. Even doing a file system format on the phone didn't clear it
out! The TTL on the record was only 4 hours, so at this point I know
that any cached copied _should_ have expired.
Are you sure you remembered to change the record serialnumber in the DNS
data? That has to be one of the favorite all-time ways to get the
behaviour you're describing (voice of experience :-)).
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