To explain: Each ICE candidate is supposed to have a unique priority number associated with it. The ICE code in rtpengine depends on this being true in several places. If it encounters two ICE candidates with the same priority number then it triggers this warning to the log, and ultimately the ICE negotiation is then likely to fail. This can happen if the remote ICE client is buggy (seen this before: duplicate priority numbers in the SDP), or (gods forbid) there's a bug in rtpengine.

Cheers


On 29/10/2021 08.59, [EXT] Stefan-Cristian Mititelu wrote:

Hi,

Out of curiosity, I've been skimming the sipwise rtpengine code about this warning and found out that it happens when "__tree_coll_callback()" callback function is called.

Now, the above callback function is present in different places that all reduce to calling "g_tree_insert_coll()" function in ./include/aux.h.

Next, from what i see in "g_tree_insert_coll()" the above callback is **only** called when there is already an old value for the given (key, value) pair. In other words, there is already an "old ice pair" there.

Hope this helps.

Thank you,
Stefan

From: sr-users <sr-users-bounces@lists.kamailio.org> on behalf of ‪M S‬ <shaheryarkh@gmail.com>
Sent: Friday, October 29, 2021 1:28 PM
To: keffa@alcall.net; Kamailio (SER) - Users Mailing List
Subject: Re: [SR-Users] RTPENGINE [ice] Priority collision between candidate pairs
 
It's just a warning, you can ignore it or explain what is the exact nature of problem you are facing?

--
Muhammad Shahzad Shafi
Tel: +49 176 99 83 10 85


Sent from my Huawei P40 5G phone


-------- Original message --------
From: keffa@alcall.net
Date: Fri, 29 Oct 2021, 10:41
To: "Kamailio (SER) - Users Mailing List" <sr-users@lists.kamailio.org>
Subject: [SR-Users] RTPENGINE [ice] Priority collision between candidate pairs
Hello @everyone

Please can you explain me how this message is errors or not ?

«  Oct 29 08:34:44 ip76 rtpengine[649]: WARNING: [YGiXZ1MmIA port 30104]: [ice] Priority collision between candidate pairs 9oZd7sWNVguf6cgl:e4b19f6635447b850 »

thank
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