[SR-Users] Re: Skip/discard branch in branch route?

Main request is the first branch. So consider changed $ru after lookup as the first (0) branch. Other branches will be appended as addition.

On Fri, 8 Sept 2023, 14:03 Benoît Panizzon, benoit.panizzon@imp.ch wrote:

Hi Yuriy

...

You also can filter it in the request route and not create branch wich doesn't belong this server ( you can achieve that by verifying ucl variable details), or making it UDP branch being forwarded to proper server which handles the particular connection.

I have started trying to solve this in request route.

I'm still truggling on how to distinguish local and non local registrations.

I have 4 CPE registered to the same AOR.

kamclt ul show [AOR] does show they are registered. 3 on the local registrar (with a socket) and one with socket [not set].

If I repeat on the other registrar I get matching information. One with a socket, the other three are [not set].

So trying to understand the hard way, what happens:

    $var(i)=0;
    while($var(i)<=$branch(count))
    {
            $var(socket) = $(ulc(aor=>socket)[$var(i)]);
            xlog("L_INFO", "$cfg(route): DEBUG BEFORE: IDX: $var(i)

TOTAL: $branch(count) URI: $(branch(uri)[$var(i)]) Socket: $var(socket)\n"); $var(i) = $var(i) + 1; }

    $var(i)=0;
    while($var(i)<=$branch(count))
    {
            $var(socket) = $(ulc(aor=>socket)[$var(i)]);
            xlog("L_INFO", "$cfg(route): DEBUG REMOVE: IDX: $var(i)

TOTAL: $branch(count) URI: $(branch(uri)[$var(i)]) Socket: $var(socket)\n"); if ($var(socket) == 0) { xlog("L_INFO", "$cfg(route): Dropping Branch IDX $var(i) URI: $(branch(uri)[$var(i)]) Socket: $var(socket)\n"); $(branch(uri)[$var(i)]) = $null; } else { $var(i) = $var(i) + 1; # do NOT increment index as the branches got renumbered. } }

    $var(i)=0;
    while($var(i)<=$branch(count))
    {
            $var(socket) = $(ulc(aor=>socket)[$var(i)]);
            xlog("L_INFO", "$cfg(route): DEBUG AFTER: IDX: $var(i)

TOTAL: $branch(count) URI: $(branch(uri)[$var(i)]) Socket: $var(socket)\n"); $var(i) = $var(i) + 1; }

What I did not yet understand.

$branch(count) is 3 !

So, does kamailio only consider the 3 registrations WITH a socket? Or is this the index starting with 0, thus 4 contacts?

When I do $(branch(uri)[$var(i)]) = $null; then $branch(count) is decremented. I suppose because the next contact takes that index, this is why I do NOT increment $var(i).

But I then get no $(branch(uri)[$var(i)]) on the highest index, suggesting that I only see 3 contacts, not all 4 of them.

Indeed, my 'BEFORE' loop did not output the contact registered on the other registrar.

So WHY is there still the INVITE being sent to the fourth, non local contact?

=> Confused!

-- Mit freundlichen Grüssen

-Benoît Panizzon- @ HomeOffice und normal erreichbar

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