Is this not possible? We have Snom 820 phones and all our employees have 2 extensions each. Registering them manually is fine, but if I try to do remote provisioning, in 3CX I enter the MAC address of the phone under their first extension, but then if I do that on their second extension it says it's already in use and can't use the same MAC address. So I've set them up manually right now. Is it not possible to do it from 3CX?