I have configured kamailio (192.168.56.102) and freeswitch(192.168.56.103) in separate virtualboxes

when making a call, the invite goes to proxy and it is forwarded to freeswitch but 
response from freeswitch is "unreachable port" attached the wireshark trace:

I don't why 10.0.2.15 is making the Invite to freeswitch, i was expecting 192.168.56.102 to do that.

UA -> 192.168.56.102 -> 192.168.56.103


Any suggestions on this?

Inline image 1

Thanks,
Surya