How disable IVR messages for errors 503, etc?

Is there any solution how to disable voice messages that caller hear when call failed for example because all routes is busy now?
Main reason why I need to do it is asterisk answer the call in any case (to playback these messages) and after this call is canceled. But I need to give only error code to my sip trank.
Thank you!
P.S. FreePBX 12.0.53