Wrong SIP to SIP SIP Cause mapping

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I’m using asterisk v1.8 with a standard scenario, A Sip call from A to B through asterisk :


The asterisk extension is :
exten => _X.,1,Dial(SIP/B/${EXTEN},600)
exten => _X.,n,Hangup()

When B send a 404 back to the asterisk, the asterisk sends a 503 to A. It is the same with 403 and some others erroc code.
I think it should send back to A the same error code.

I have done tests with some versions:
– 1.8.11.x : wrong sip cause mapping
– : wrong sip cause mapping
– 1.10.3 : wrong sip cause mapping
– : works good

Do i do something wrong or should i open a bug ?