Hi, I have set everything up and everything is working great. Inbound calls and outbound calls, except for 1 specific number we are trying to call. Not entirely sure where to look. At first i thought it would be outbound rule but that won't explain why only this number is not working. Activity log is showing this: Call or Registration to 003348xxxxxxx@(Ln.10000@Maarten Test) has failed. x.x.x.x replied: 404 Not Found; from IP:x.x.x.x:5060 Anyone has any hints as to why this is not working?