SIP respone 503 instead of 480

I’m newbie of freepbx. I have faced an issue with sip respone code. When use not answer, i got sip 503 instead of 480.
I got sip SIP/2.0 503 Service Unavailable but in
sip message said:“X-Asterisk-HangupCause: No user responding, X-Asterisk-HangupCauseCode: 18”
how can i remapping the cause code or fix that issue

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