Have a control room on a site and they have a DR site that they test monthly. So they go to the DR location and login the phones and test all is good, then they go back to the main site and try to login the normal phones and the IP Addresses get blacklisted and phones (J179) just display “Acquiring Service” after first attempt of logging back in. Clear the blacklist on the service status and the phone comes straight up. The IPO LAN 1 is set for default "Block blacklist only" and both sets of phones are on customer LAN/WAN so no remote users. Any way to stop this, is it possible to white list the phone Voice VLAN subnet(s) or just individual IP's?