Has anyone been able to get this to work. I have been working on this for quite some time and haven't been able to get the remote 9508 phones to register. They either stay in "Discovery", or "registering". I have had the customer check the firewall, forward ports 1718-1720,49152-53247 to the IPO. STUN reports "Blocking Firewall" when I run it. I have also tries to set the STUN fields manually to all the different firewall/NAT options.