To add my 2c, if the performance is a **really big** concern, the solution with transaction flags as mentioned by Alex is one of the best.

In request route test for to-tag and then setflag(x). Then in onreply_route[...] or failure_route[...] test if isflagset(x).

The other suggestions are also very fast, but not as fast as with transaction flags.

On the other hand -- some details about avp names -- i: for avp names is saying that the name has to be treated as integer id, which is not the case for your example with:

$avp(i:is_reinvite) = 1;

After i: must be a number up to 2^16. Or just remove the i: and let it be string name.

Cheers,
Daniel


On 12/07/16 15:55, Olle E. Johansson wrote:

On 12 Jul 2016, at 15:18, Grant Bagdasarian <gb@cm.nl> wrote:

Hi,
 
Is it possible in Kamailio, or SIP in general, to detect if a 200 OK is for a ReINVITE?
 
Not from the 200 OK, but the matching INVITE you can check if there’s a to-tag in Kamailio and SIP.

In Kamailio, if you are stateful, you can use the TMX module pseudovariables to check the request
matching the response and check if there’s a to-tag. Check the cookbook for 

$T_req(pv)

http://www.kamailio.org/wiki/cookbooks/4.4.x/pseudovariables

/O


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