I'm trying to setup Kamailio everything install correctly but I can't connect to my server with the users created. Not even in my local network it seems like the machine doesn't respond to the packets or maybe the packets are not delivery to my server but when I ping the machine everything is good I'm redirecting the port 5060 to my server same as range  ports from 10000 to 20000 but can't connect Any one knows which is the problem here?

I'm using Kamailio 4.0 on a virtual machine with virtual box.

A copy of the same machine its running a web server of course with a different mac and IP and everything works fine.