We reset up our 3CX server recently and upgrade the system to version 10 Service Pack 1.1. We reconfigure our VOIP provider: MyNetPhone. However, the Ports/Truncks Status always shows that it's "Not Registered" If check the "Server Activity Log", here is the details: 12:17:18.650 [CM504005]: Registration failed for: 10000@MyNetfone; Cause: 404 Not Found; from IP:220.127.116.11:5060 12:17:18.523 [CM504003]: Sent registration request for 10000@MyNetfone 12:12:18.503 [CM504007]: Next attempt to register 10000@MyNetfone is scheduled in 5 minute From our MyNetfone management site, we already configure the PBX to bind with our 3CX Server's public IP. We can ping through the MyNetFone server below from our 3CX server with no problem: sip00.mynetfone.com.au (10:55:25.442) We can telnet the port 5060 successfully. Anyone can help with the problem? I would be happy to hear from you. Thanks in advance.