Configure Asterisk As SIP UA Using NAT

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I have installed Asterisk 11.13.1 on Fedora running in VirtualBox. The VB network interface is configured to use NAT. The host machine is Windows 7 and is connected to a SIP server using a VPN connection.

I have configured ‘externaddr’, ‘localnet’ and ’nat=force_rport,comedia’. Asterisk registration is successful, I see in Wireshark the packets send between Asterisk and SIP server. However, when I try to call using a softphone, installed directly on the Windows host, I see no incoming packets from the SIP server to Asterisk, so it looks like my UA is not accessible from the SIP server.

Could you tell me what I am doing wrong ?

regards Bogdan