VIP and NAT64 - SIP problem.

Hello all,

We have one Fortigate 60D configured with some VIP to our internal service and this is working ok. All services are using IPv4, including our SIP server.

Recently I configured IPv6 to all our services, using NAT64 and VIP (ipv6). All services are working very well, like HTTP, SMTP, ICA, DNS. But, with SIP don't.

Tried nmap to sip service and it's port are filtering and open with IPv4 but only filtering with IPv6. I can't get the issue here.

Any help here? Some tips or how-to?

Thank you,