Hello,

indeed, the docs for it were outdated, the code evolved and the docs were not updated. I tried to bring them correlated with the code, hope I haven't missed anything in the code:

  * https://www.kamailio.org/wiki/cookbooks/devel/pseudovariables#t_branch_idx

Cheers,
Daniel

Hello.

We faced an issue that $T_branch_idx called from failure_route returned a strange result.

Few words about our setup. 

We use branch indexes like key in avp when we store via-branch value for rtpengine.

route[RTPMANAGE]

...

if ( is_request() and is_method("INVITE") and !has_totag() and t_is_branch_route() )
{
$avp(viabranch$T_branch_idx) = $branch_str;
}

$avp(extra_branch_id) = $avp(viabranch$T_branch_idx);

$var(rtpkey) = $var(rtpkey) + " via-branch=extra";

......

rtpengine_manage($var(rtpkey));

Call this route in branch_route and in failure_route. 

In branch_route T_branch_idx is 0, in failure_route is 1. 

In documentation:

the index (starting with 1 for the first branch) of the branch for which is executed the branch_route[]. If used outside of branch_route[] block, the value is '0'.

But in source code behavior is different. (modules/tmx/t_var.c:480):

for BRANCH_FAILURE_ROUTE and BRANCH_ROUTE it is idx = tcx->branch_index, but for FAILURE_ROUTE it is idx = t->nr_of_outgoings + nr_branches; 

Can you describe why for failure_route it is different and what we can do in our case? And can you update documentation for this variable if it is wrong?

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Daniel-Constantin Mierla -- www.asipto.com
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