Almost caught you on IRC Mike.Our server is in a NAT'd network and all agents registered in the same LAN. I can remotely register by using the public IP and the contact string is right.Call-ID: ZTZhMGJkZTE0NzNjZTlmZTkxYmU5NWRlZTU1MzJlYTE.User: 637@192.168.1.16Contact: "user" <sip:637@210.73.8.180:5090;rinstance=9fc589bbc407518f>Agent: Zoiper rev.1809So it's like only happens on our LAN and where there's a fs_path present.Just curious, why agents registered on a local LAN has param fs_nat=yes; (default internal profile, port 5060) ?Seems our time doesn't match, I'm generally available in office 9:00AM-6:00PM GMT+0800, so will try to catch you tomorrow.Thank you.