[OpenSIPS-Users] I need some help in attr matching while forming the Branch .

[Ben Newlin]

Sasmita,

I can’t provide a working example as I don’t have a use case like this. However, this piece of script you’ve provided does not represent a correct flow. I think you may need to review how the different types of routes, and particularly branch routes, work. [1]

I don’t have any experience with Registrar module, so take all of the following with a grain of salt. Someone with more experience with registrar can maybe keep me honest here.

You should only need to call next_branches() one time, as it already loads all contacts returned by lookup() into parallel branches (assuming you are using the “b” flag for lookup()). This means they are all sent out at once, not serially. So you don’t need to send the next branch in failure_route because they’ve all already been sent.

The branch route is executed as the last route before the message is being sent out. You certainly do not need to call next_branches() there either, in fact its behavior in a branch route is not defined in the docs. Also, I don’t know what your route “1” does, but you likely don’t need it from branch route either. As long as you don’t drop the branch, it will automatically be sent out. Lastly, you have the actual drop() command commented out, so this code won’t work as I described.

Lastly, failure_route is armed for the whole request. In the case of parallel branching, it will only be called once for the request, not once for each branch, and only if all branches receive negative replies.

One thing I’m not clear about is what happens if you end up dropping all the branches. I don’t know if failure_route would be called then, but it would be pretty easy to verify that. I think it would.

Again, I can’t speak to your specific use case, but a representative version of the solution I recommended is below. *I have not tested or verified this code.*

route {
  # all of your normal routing logic

  if (lookup(“<domain>”, “b”)) {
    if (next_branches()) {
      t_on_branch(“check_attrs”);
     t_on_failure(“no_branches”);
    }
    else {
      # handle case of no contacts
      t_reply(404, “Not Found”);
    }
  }
  else {
    # handle case of failed lookup
    t_reply(404, “Not Found”);
  }
}

branch_route[check_attrs] {
  $var(count) = $(hdr(Call-Info){csv.count});

  while($(var(count) >= 0)) {
    if ($(avp(attr){s.index, $(hdr(Call-Info){csv.value,$var(i)})}) == NULL) {
      # as soon as one requirement doesn’t match, you know you don’t want to route
      drop();
    }

    xlog("count: $var(count)\n");
    $var(count) = $var(count) - 1;
  }
}

failure_route[no_branches] {
   # handle case where all branches failed
  t_reply(404, “Not Found”);
}

[1] https://www.opensips.org/Documentation/Script-Routes-3-2

Ben Newlin

From: Users <users-bounces at lists.opensips.org> on behalf of Sasmita Panda <spanda at 3clogic.com>
Date: Thursday, November 2, 2023 at 9:36 AM
To: OpenSIPS users mailling list <users at lists.opensips.org>
Subject: Re: [OpenSIPS-Users] I need some help in attr matching while forming the Branch .
________________________________
Hi Ben ,



failure_route[1] {
   if ( t_check_status("404|477|480|481|408|486|50[234]")){
if (next_branches())
{
    t_on_branch("attr");
         }

    }
}


branch_route[attr]
{
$var(count) = $(hdr(Call-Info){csv.count});

$var(i) = 0;
$var(match-count) = 0;

while($var(i) < $(var(count))){

         if ($(avp(attr){s.index, $(hdr(Call-Info){csv.value,$var(i)})}) != NULL){
          xlog("counter: $var(i)th  index matched in attribute \n");
           $var(match-count)= $var(match-count) + 1;
          }
        xlog("counter: $var(i)\n");
        $var(i) = $var(i) + 1;
}

        if ($var(i) == $var(match-count)){
## Here I want to give call to that contact .. if that fails then again it should come to next branch and again compare
            t_on_failure("1");
            route(1);
      }
      else{
# Here if the condition does not match . then i want to do the comparison again
      if (next_branches()){
             t_on_branch("attr");
           }
  #      drop();
       }
}

As for my expectation, it's not working . How does it work ? Where should I use T_branch_Idx ? Can I get some examples of this ?


Thanks & Regards
Sasmita Panda
Senior Network Testing and Software Engineer
3CLogic , ph:07827611765

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