Quote
However, I am still unable to add the device to my ObiTalk dashboard
Why not, specifically? What, exactly, happens? What error message do you get, etc?
Is this a brand new device, or one that's been resold or otherwise used?
What is the firmware version installed on it?
You should not have to put the device in the DMZ, nor change any firewall settings at all. If the device is running the current firmware, (update it manually if necessary), then it should have no trouble being added to the dashboard.