sr-users December 2024

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3 weeks, 3 days

registrar / usrloc / tm => 'load balanced' serial forking?

by Benoit Panizzon

Hi List With the dispatcher module, you can use different ways of load balanced and weighted serial or parallel forking. Is there a corresponding way to achieve load balanced serial forking to a destination set loaded from registered locations? Use case: Customer with a high availability set-up has two redundant PBX registered to the same AoR. Calls can not be sent in parallel as this would generate two concurrent calls to the end device but call should be distributed evenly between the two contacts registered with that AoR. Mit freundlichen Grüssen -Benoît Panizzon- -- I m p r o W a r e A G - Leiter Commerce Kunden ______________________________________________________ Zurlindenstrasse 29 Tel +41 61 826 93 00 CH-4133 Pratteln Fax +41 61 826 93 01 Schweiz Web http://www.imp.ch ______________________________________________________

3 weeks, 3 days

HTTP_CLIENT timeout

by Sergio Charrua

Hello all! For a STSH project, kamailio is making HTTP requests to a middleware (REST API) using HTTP_CLIENT module. I have set the parameter "timeout" to 2 second, but this increases PDD to too high levels, so I have set it to 1 second. Problem is that 1sec is also too high! The parameter only accepts integer values, so no way to set this to 0.5sec. I thought of having a way for kamailio to be aware that HTTP node #1 is down, so next request it will use HTTP node #2 instead. And once in a while, say, every 60 seconds, kamailio would check status of HTTP node #1 and, if OK, then it will switch back to HTTP node #1 and failover to node #2 when required. The HTTP_CLIENT, as far as I know, doesn't do that. So the question is: what would be the best approach to have this feature on Kamailio? i thought about using HTable and have a flag with value of the HTTP connection to use by default. At worst, only the 1st failover request would take 1 or 2 seconds to timeout....then the subsequent HTTP requests would use node #2. Any ideas? Atenciosamente / Kind Regards / Cordialement / Un saludo, *Sérgio Charrua*

3 weeks, 3 days

How to inspect/dump a stacked xavp? / How to stack two xavp on each other?

by Benoit Panizzon

Hi List I'm trying to inspect the content of the $xavp(tm_contacts) to figure out how t_load_contacts exactly behaves when called multiple times. $var(k) = 0; while ($xavp(tm_contacts[$var(k)]) != $null) { $var(out) = "nothing"; xavp_params_implode("tm_contacts[$var(k)]", "$var(out)"); xlog("L_INFO", "$cfg(route): tm_contacts idx: $var(k) => $var(out)\n"); $var(k) = $var(k) + 1; } My stack contains multiple entries. Unfortunately I struggle to access the lower entries. xavp_params_implode("tm_contacts[$var(k)]", "$var(out)"); does nothing when $var(k) > 0 What is the best way to dump a complete xavp stack? I suspect t_load_contacts does flush the complete stack. Is there a way to stack an xavp on top of another one? Something like: xavp_rm("contact_stack"); # Initialize Stack lookup("location", "sip:alice@example.com"); t_load_contacts(0); $xavp(contact_stack) = $xavp(tm_contacts); lookup("location", "sip:bob@example.com"); t_load_contacts(0); $xavp(contact_stack) = $xavp(tm_contacts); # contact_stack now contains alice + bob lookup("location", "sip:carlie@example.com"); t_load_contacts(0); # $xavp(tm_contacts) now contains only charlie. $xavp(tm_contacts) = $xavp(contact_stack); # $xavp(tm_contacts) now contains only alice, bob + charlie. t_next_contacts(); # Push contacts to destination list creating branches. t_relay(); # Invite all contacts Mit freundlichen Grüssen -Benoît Panizzon- -- I m p r o W a r e A G - Leiter Commerce Kunden ______________________________________________________ Zurlindenstrasse 29 Tel +41 61 826 93 00 CH-4133 Pratteln Fax +41 61 826 93 01 Schweiz Web http://www.imp.ch ______________________________________________________

3 weeks, 6 days

segmentation fault when assigning xavp to another xavp (trying to stack them)

by Benoit Panizzon

Hi version: kamailio 5.7.6 (x86_64/linux) on Ubuntu from the: http://deb.kamailio.org/kamailio57 repository AOR alice has 4 contacts with q=0.5 AOR bob has 1 contact with q=0.5 I can reproduce a crash with this code snipplet: xavp_rm("contact_stack"); # Make sure XAVP does not exist. lookup("location", "sip:alice@example.com"); t_load_contacts(0); # after this, $xavp(tm_contacts) has four elements $xavp(contact_stack) = $xavp(tm_contacts); # Store the four elements on my stack # Verify, $xavp(contact_stack) now has four elements, copy successfull. lookup("location", "sip:bob@example.com"); # after this, $xavp(tm_contacts) has one element $xavp(tm_contacts) = $xavp(contact_stack); # Append the four previously saved contact with the one in $xavp(tm_contacts) if (!t_next_contacts()) { xlog("L_INFO", "$cfg(route): ERROR NO CONTACTS LOADED \n"); sl_send_reply("500", "Server Internal Error - Cannot get contacts"); } # Load contacts into destination set to parallel fork to five contacts. => segmentation fault! Shall I open an issue on github or am I performing a forbidden action? I'm doing some more test to find out where exactly the crash occurs. I'm not sure if it happens when adding to tm_contacts of when calling t_next_contacts. Mit freundlichen Grüssen -Benoît Panizzon- -- I m p r o W a r e A G - Leiter Commerce Kunden ______________________________________________________ Zurlindenstrasse 29 Tel +41 61 826 93 00 CH-4133 Pratteln Fax +41 61 826 93 01 Schweiz Web http://www.imp.ch ______________________________________________________

3 weeks, 6 days

uneven load distribution after gw goes down?

by David Villasmil

Hello guys, I'm seeing the dispatcher module used with ds_select_dst($avp(dsdst), "0") is distributing the calls to a failing gw, to the next available gw instead of distributing it. When a gw fails and has been marked as inactive, shouldn't it be taken out of the list and the list recomputed? is this not the case? Thanks all Regards, David Villasmil email: david.villasmil.work(a)gmail.com

4 weeks

Updated: Online devel meeting on matrix - 15:00 UTC, Dec 9, 2024

by Daniel-Constantin Mierla

Hello, we should consider an online devel meeting sometime soon to summarize what was done at (and still needs to be done after) devel meeting in Dusseldorf and plan a bit the targets for next major release 6.0. If considered useful, I propose Dec 9, 2024 (Monday) at 15:00UTC (16:00 Berlin/Paris/Madrid/Rome), but we can also look for other dates as well. Topics to be discussed can be added at: - https://github.com/kamailio/kamailio-wiki/blob/main/docs/devel/irc-meetings… Pull requests can be made by users without git access. Cheers, Daniel -- Daniel-Constantin Mierla -- www.asipto.com www.twitter.com/miconda -- www.linkedin.com/in/miconda

4 weeks

WS and rtpengine_manage

by Knserbrave

Hi Kamailio Community, When testing rtpengine_manage and websockets, I noticed that if the rtpengine table in the database is not used, a new websocket is created for every call for a given dialog. That is, when an INVITE is received, an offer is sent to rtpengine. When the 200 OK or 18[3|0] is received, an answer is sent. However, the WS identifier often changes and as a result the request is not sent over the same websocket. This is problematic particularly when using FQDNs in the Kamailio configuration. When a load balancer is used between Kamailio and rtpengine, the answer may arrive at a different rtpengine in the cluster. After tracing through the source, I could not find a configuration parameter or set of triggers that I could manipulate to fix this. It leads me to believe it is only possible to reuse the websocket when the rtpengine table is used. Does anybody have more experience than I in this area that may be able to point me in the right direction, making load balancers for rtpengine_manage calls possible?

4 weeks

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