Cant make a call via public IP to HDX 8000 after integrating with CUCM

Dear Support,

i was using Polycom HDX 8000 standlone system to make a call to our other branch office vua the public IP but recently we integrated HDX 8000 with our existing CUCM after that we can able to make calls to other cisco endpoints which is also registered with CUCM but unable to make calls to other branch office via the internet which is not registered with CUCM

my question is after integrating with CUCM i cant make calls via the internet to other standalone video endpoints uisng the public IP?

Regards

Awad