[SR-Users] tm response issue

[Iñaki Baz Castillo]

2010/4/14 Klaus Darilion <klaus.mailinglists at pernau.at>:
> Hi!
>
> Kamailio does not forward the received 503 response but instead generates a
> new 500 response. Failure routes are not activated.
>
> Is this a feature or a bug?


A RFC 3261 feature:


16.7 Response Processing

      6.  Choosing the best response  (page 110)

         A proxy which receives a 503 (Service Unavailable) response
         SHOULD NOT forward it upstream unless it can determine that any
         subsequent requests it might proxy will also generate a 503.
         In other words, forwarding a 503 means that the proxy knows it
         cannot service any requests, not just the one for the Request-
         URI in the request which generated the 503.  If the only
         response that was received is a 503, the proxy SHOULD generate
         a 500 response and forward that upstream.



-- 
Iñaki Baz Castillo
<ibc at aliax.net>