We changed the IPs on our sip servers last night. A few days before we changed them we made the following change in our TA900s: voice trunk T01 type sip sip-server primary 216.x.x.x registrar primary 216.x.x.x to voice trunk T01 type sip sip-server primary sip3.atlga.domain.com registrar primary sip3.atlga.domain.com Then we changed the A record from the old IP to the new IP. We run a pretty low TTL on that domain and flushed the DNS servers that the TA900s look to. After several hours about 60% of the TA900s required a reboot to resolve the hostname to the new IP and the other 40% won't do it no matter how many times your reboot. The only fix is to change everything back to IP based using the new IPs. The oldest firmware we are running is T900G2A-A4-02-00-E.biz upto the most recent. Has anyone else run into this kind of trouble with the TA900s? Richey