[SR-Users] tm module question

[Klaus Darilion]

Am 14.01.2011 16:52, schrieb Prelle, Stefan:
> Hi folks,
>
> I have a problem with a scenario where an incoming INVITE is forwarded to a redirect server
> which responds with 302 and a new target in the Contact header (B). The call is being forwarded
> to the new contact correctly. All responses from B that are either provisional or a 200 OK
> are being routed back to the caller. If B responds with any code>=400 the 302 from the
> redirect server is being returned to the caller instead of the received code.
>
> A          B          C
> |--INVITE->|          |
> |          |--INVITE->|
> |          |<---302---|   D
> |          |----INVITE--->|
> |          |<-----404-----|
> |<---302---|
>
> Is this intended? And if so, is there any way to change this behaviour so the latest received
> response is returned?

Yes - it is intended. The lowest response code of all branches will used 
(RFC conform).

You can change this behavior by either (I think b is what you look for).

a) load another failure route in the existing failure route. in the new 
failure route use t_reply() to set a proper failure route

b) play around with tm module parameters, especially failure_reply_mode():
http://www.kamailio.org/docs/modules/3.1.x/modules/tm.html#failure_reply_mode

regards
klaus