Hello, the 477 error code is a specific one for Kamailio. There is currently no way to change it over the configuration, but you can change it in the code. In the past it was not possible to catch this internal 477 internally in a failure_route or similar. I have not tested it if this is still the case, probably yes. One way to work around it would be to use the "0x02" flag in t_relay(..) and then generate another reply by directly in the configuration. Cheers, Henning From: Patrick Karton <patrickarton(a)hotmail.com> Sent: Sonntag, 12. Februar 2023 17:02 To: sr-users(a)lists.kamailio.org Subject: [SR-Users] change default 477 response code per case Hello , i would like to know if there is a way to change the default 477 response code generated by kamailio in some cases. for example if kamalio generates 477 because its not able to reach a peer i would like to change it to another code before to forward it. Thanks.