[asterisk-dev] Forwarding of SIP response codes

[Deti Fliegl]

Hi,

it seems that SIP response codes are not forwarded thoroughly back to an 
SIP-UA. This happens for example in a call setup like this:

SIP-Phone -> Asterisk -> SIP-Gateway

If the SIP gateway answers 404 asterisk converts this into 503 and sends 
it to the calling SIP phone. The additional header 
"X-Asterisk-HangupCause: Unallocated (unassigned) number" is nice but 
does not help the SIP phone to display the correct hangup cause.
Is there any way to just forward the original response code? Did I miss 
something in the documentation to get this working?

Deti