[Users] Problems with DNS.

I'm trying to get my machine ready to work externally, with public Ip addresses. I believe I've got all the pieces ready for the domain. I have the PTR records published for my server's public IP address. I have the .sip_.udp.mobilia.it. 0 0 5060 sipserver.mobilia.it. record (I tried it with and without the .mobilia.it added to the udp) published, I tell the server to listen on the IP addresses which maps it's name in DNS, I have a line after listen : alias="mobilia.it" (I've tried both FQDN and this) I've exported the domain both as the command export SIP_DOMAIN="mobilia.it" and in the openserctlrc (does it need to be the FQDN or just the domain, again, neither seem to make a difference..) however, I still can't get the machine to believe that it is actually responsible for this domain. When I register I have errors along this line: (it registers, obviously, but the logic is wrong, since he thinks the user is coming from another domain). grep_sock_info - checking if host==us: 10==13 && [mobilia.it] == [89.202.252.16] Nov 3 10:13:34 sipserver /usr/local/sbin/openser[3193]: grep_sock_info - checking if port 5060 matches port 5060 Nov 3 10:13:34 sipserver /usr/local/sbin/openser[3193]: grep_sock_info - checking if host==us: 10==13 && [mobilia.it] == [89.202.252.16] Nov 3 10:13:34 sipserver /usr/local/sbin/openser[3193]: grep_sock_info - checking if port 5060 matches port 5060 Can anyone venture a guess as to what I might be missing???