My wife has a Moto X and I have a Moto G. Both phones get a fast busy, but using a friend cell from our house goes through.
If this is just one phone number, then open a support request. Use the chat line for faster service. Republic Help
Since you mention that you are at your house…are your own calls going through WiFi or cellular?
If WiFi, have you tried calling on cellular? Do you get the same result?