Currently an error is given when trying to send from a Non USA number internationally - EG try to send from AU mobile to any international mobile gives this error in the conversation screen:

"The +16514XXXXXX phone number is currently not reachable using the +61483XXXXXX phone number, instead use US number."

There are a whole bunch of error codes in the Trigger "Messaging Error - SMS", but not one for this specific error.

Please add a Messaging Error Trigger for the error "The +16514XXXXXX phone number is currently not reachable using the +61483XXXXXX phone number, instead use US number."