Cannot Connect to hosted VoIP Server

Hi,

I have a new RB2011 configured to default NAT and firewall. Now my problem is that whenever I try to connect to a public VoIP server 5060 i get RTO / filtered (nmap scan). But from my friend’s PC / online scan tools it says 5060 is open. Why is this so??

Regards,
Srijit B

What is your firewall printout?