Hi Henning,

I used xavp_params_implode() and xlog() to log the contents of the XAVP

You can see the contents of the XAVP in the previously provided log lines (showing the contents before and after the ds_next_dst() call):

FAILURE ROUTE: Already have replies on this transaction. Selecting next destination from: [grp=3;uri=sip:127.0.0.1:7012;transport=udp;]
FAILURE ROUTE: Next destination selected: [sip:127.0.0.1:7011;transport=udp] from [grp=3;uri=sip:127.0.0.1:7011;transport=udp;]

FAILURE ROUTE: Already have replies on this transaction. Selecting next destination from: [grp=3;uri=sip:127.0.0.1:7011;transport=udp;]
FAILURE ROUTE: Next destination selected: [sip:127.0.0.1:7010;transport=udp] from [grp=3;uri=sip:127.0.0.1:7010;transport=udp;]

FAILURE ROUTE: Already have replies on this transaction. Selecting next destination from: [grp=3;uri=sip:127.0.0.1:7010;transport=udp;]
FAILURE ROUTE: Next destination selected: [sip:127.0.0.1:5072;transport=udp] from [grp=2;uri=sip:127.0.0.1:5072;transport=udp;]

FAILURE ROUTE: Already have replies on this transaction. Selecting next destination from: [grp=2;uri=sip:127.0.0.1:5072;transport=udp;]
FAILURE ROUTE: Next destination selected: [sip:127.0.0.1:5072;transport=udp] from [grp=2;uri=sip:127.0.0.1:5072;transport=udp;]

FAILURE ROUTE: Already have replies on this transaction. Selecting next destination from: [grp=2;uri=sip:127.0.0.1:5072;transport=udp;]
FAILURE ROUTE: Next destination selected: [sip:127.0.0.1:5071;transport=udp] from [grp=1;uri=sip:127.0.0.1:5071;transport=udp;]

Thanks,

  

 
  

GEOFF GOAS
Manager
Application Engineering  

 
  

T: +1 239-425-9132 (Florida)
F: +1 239-425-6845
Skype: GeoffGoas  

  

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From: Henning Westerholt <hw@gilawa.com>
Sent: Wednesday, September 27, 2023 13:51
To: Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.org>; Patrick Karton <patrickarton@hotmail.com>
Cc: Geoff Goas <Geoff.Goas@interoptechnologies.com>
Subject: RE: [SR-Users] Re: What is the expected behavior for dispatcher's ds_next_dst?
 

Hello,

 

have not checked the code, but the ds_next_dst() should just get the next destination from the configured XAVP.

 

Have you tried to print it e.g. with pv_xavp_print() to see if there is maybe too much or wrong content inside?

 

Cheers,

 

Henning

 

--

Henning Westerholt – https://skalatan.de/blog/

Kamailio services – https://gilawa.com

 

From: Geoff Goas via sr-users <sr-users@lists.kamailio.org>
Sent: Mittwoch, 27. September 2023 19:03
To: Patrick Karton <patrickarton@hotmail.com>; sr-users@lists.kamailio.org
Cc: Geoff Goas <Geoff.Goas@interoptechnologies.com>
Subject: [SR-Users] Re: What is the expected behavior for dispatcher's ds_next_dst?

 

Hi Patrick,

 

That's exactly the workaround that I have in my back pocket - I tested it and it works well. I am still interested in getting some clarification, though.

 

Thanks

From: Patrick Karton <patrickarton@hotmail.com>
Sent: Wednesday, September 27, 2023 12:37
To: sr-users@lists.kamailio.org <sr-users@lists.kamailio.org>
Cc: Geoff Goas <Geoff.Goas@interoptechnologies.com>
Subject: RE: [SR-Users] What is the expected behavior for dispatcher's ds_next_dst?

 

Hi, 

 

before using t_relay you can probably check if next hop uri is still in the target group with

 

ds_is_from_list([groupid [, mode [, uri] ] ])

 

 

for example ds_is_from_list("3","3","$du"); all parameters can be variables too.

 

you can check on documentation the mode parameter to see how comparison is done.

 

 

De : geoff.goas--- via sr-users <sr-users@lists.kamailio.org>
Envoyé : mardi 26 septembre 2023 21:02
À : sr-users@lists.kamailio.org <sr-users@lists.kamailio.org>
Cc : geoff.goas@interoptechnologies.com <geoff.goas@interoptechnologies.com>
Objet : [SR-Users] What is the expected behavior for dispatcher's ds_next_dst?

 

Hello,

I have some questions about dispatcher's behavior. I noticed that when I first ds_select_dst() a specific dispatcher group ID, ds_next_dst() will cycle through the active destinations in that group. When it reaches the end of the destinations in the group, it does not return "false", instead it starts to return destinations that are not a part of that group, ie. those destinations which are listed prior to the selected group in the dispatcher.list file. Is this the expected behavior? I've observed it on kamailio 5.3 and 5.5 releases.

My dispatcher.list:

# Group 1
1 sip:127.0.0.1:5071;transport=udp 8 0
# Group 2
2 sip:127.0.0.1:5072;transport=udp 8 0
# Group 3
3 sip:127.0.0.1:7010;transport=udp 8 0
3 sip:127.0.0.1:7011;transport=udp 8 0
3 sip:127.0.0.1:7012;transport=udp 8 0
# Group 4
4 sip:127.0.0.1:5071;transport=udp 8 0
4 sip:127.0.0.1:5072;transport=udp 8 0

I have the following in failure_route (excerpt):

                    $var(dsFoundDestination) = 0;

                        if (t_any_replied())
                        {
                            xavp_params_implode("_dsdst_", "$var(dsDestinations)");
                            xlog("L_INFO", "FAILURE ROUTE: Already have replies on this transaction. Selecting next destination from: [$var(dsDestinations)]");
                            if (ds_next_dst())
                            {
                                xavp_params_implode("_dsdst_", "$var(dsDestinations)");
                                xlog("L_INFO", "FAILURE ROUTE: Next destination selected: [$du] from [$var(dsDestinations)]");
                                $var(dsFoundDestination) = 1;
                            }
                        }
                        else if (ds_select_dst("3", "8")) // Dispatcher Group 3
                        {
                            xlog("L_INFO", "FAILURE ROUTE: Did not find any replies on this transaction. Selected destination: [$du]");
                            $var(dsFoundDestination) = 1;
                        }
                        if ($var(dsFoundDestination))
                        {
                            $var(logString) = "FAILURE ROUTE: Relayed to [" + $du + "]";
                            if (t_relay())
                            {
                                xlog("L_INFO", "$var(logString)");
                            }
                        }

Produces the following logs:

FAILURE ROUTE: Did not find any replies on this transaction. Selected destination: [sip:127.0.0.1:7012;transport=udp]
FAILURE ROUTE: Relayed to [sip:127.0.0.1:7012;transport=udp]
FAILURE ROUTE: Already have replies on this transaction. Selecting next destination from: [grp=3;uri=sip:127.0.0.1:7012;transport=udp;]
FAILURE ROUTE: Next destination selected: [sip:127.0.0.1:7011;transport=udp] from [grp=3;uri=sip:127.0.0.1:7011;transport=udp;]
FAILURE ROUTE: Relayed to [sip:127.0.0.1:7011;transport=udp]
FAILURE ROUTE: Already have replies on this transaction. Selecting next destination from: [grp=3;uri=sip:127.0.0.1:7011;transport=udp;]
FAILURE ROUTE: Next destination selected: [sip:127.0.0.1:7010;transport=udp] from [grp=3;uri=sip:127.0.0.1:7010;transport=udp;]
FAILURE ROUTE: Relayed to [sip:127.0.0.1:7010;transport=udp]
FAILURE ROUTE: Already have replies on this transaction. Selecting next destination from: [grp=3;uri=sip:127.0.0.1:7010;transport=udp;]
FAILURE ROUTE: Next destination selected: [sip:127.0.0.1:5072;transport=udp] from [grp=2;uri=sip:127.0.0.1:5072;transport=udp;]
FAILURE ROUTE: Relayed to [sip:127.0.0.1:5072;transport=udp]
FAILURE ROUTE: Already have replies on this transaction. Selecting next destination from: [grp=2;uri=sip:127.0.0.1:5072;transport=udp;]
FAILURE ROUTE: Next destination selected: [sip:127.0.0.1:5072;transport=udp] from [grp=2;uri=sip:127.0.0.1:5072;transport=udp;]
FAILURE ROUTE: Relayed to [sip:127.0.0.1:5072;transport=udp]
FAILURE ROUTE: Already have replies on this transaction. Selecting next destination from: [grp=2;uri=sip:127.0.0.1:5072;transport=udp;]
FAILURE ROUTE: Next destination selected: [sip:127.0.0.1:5071;transport=udp] from [grp=1;uri=sip:127.0.0.1:5071;transport=udp;]
FAILURE ROUTE: Relayed to [sip:127.0.0.1:5071;transport=udp]

I want to stop the loop once there are no more active destinations in group 3. Is the solution simply to check that the selected destination is part of the desired group and stop processing if it is not?

Thanks for your time.
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