i was trying to implement IMS platform in separated servers, i used ubuntu server 16.04 LTS, and ng-voice repository (Kamailio 5.1) with the installation wizard and minimum Conf

i also choose FHoSS as HSS

bind9 as DNS 

When i tried to register the Proxy-CSCF is not responding to any request, even no timeout, or error massage, and of course the request is not handled to I-CSCF.

The client perform 11 tries, and got no respond

Previously i had success with the one image IMS vm, and tried it on separated servers (kamailio version 4.2.4)

Am i missing something ? how can i start troubleshoot as there is no error massages ?

Is it because i'm using ubuntu 16 instead of 14?

your help is highly appreciated !

attached is my configuration files 

Thanks in Advance

Amar