We’re you able to get it working.
Yes. I wanted to try something out instead of using Internal or External I used Custom in the template for the IP Addresses so I could set a DNS name. I did not put the :84 on the end. The reason they first worked was because of the PnP feature that was recently added. I must have used that when first booting the phones. 
Guess i need to go a few rounds at the rodeo. 
lol
Thanks Tony