[SR-Users] Branch feedback behaviour

[Alex Balashov]

Hello,

I've got a situation like this:

    UAC ---> (Kamailio)
                 ----------> 1. redirect server on branch 1
                 <---------- 2. 302 redirect
                 ----------> 3. ACK
                ----------------------------> UAC B

Problem is, if CANCEL comes in at the exact moment that the INVITE to 
the redirect server (#1) is "in flight", i.e. has not returned a 302 
yet, then the transaction gets cancelled and 302 is fed back to the 
calling UAC.

Having the 302 fed back to the calling UAC in any circumstances is quite 
undesirable. I just need to drop it. Problem is, in all other 
situations, I need to use it--I consume it in a failure_route and create 
new branches based on it.

What's the best way to accomplish this? I'm concerned that if I use a 
global onreply_route to filter all 302s going back to callers, that will 
prevent it from percolating down to the failure_route.

Suggestions appreciated, and thanks!

-- Alex

-- 
Alex Balashov - Principal
Evariste Systems LLC
Tel: +1-678-954-0670
Web: http://www.evaristesys.com/, http://www.alexbalashov.com/

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