[OpenSIPS-Users] OpenSIPS and Teams - Route headers and FQDN

Daren FERREIRA darencrew at hotmail.com
Tue Feb 21 15:57:29 UTC 2023

Hello Karsten,

Of course I did, that was my first reference ;-)

Have a nice day too


> Le 21 févr. 2023 à 16:48, Karsten Wemheuer <kwem at gmx.de> a écrit :
> Hi Daren,
> because you mention MS Teams: do you know the blogpost "OpenSIPS as MS
> Teams SBC" [1]? Maybe the description will help you.
> Have a nice day,
> Karsten
> [1] https://blog.opensips.org/2019/09/16/opensips-as-ms-teams-sbc/
> Am Dienstag, dem 21.02.2023 um 15:30 +0100 schrieb Daren FERREIRA:
>> Hello,
>> According to my understanding of OpenSIPS Route headers management
>> with loose_route function, it is only able to test matching between
>> local listening IP addresses and Route headers, not with FQDN.
>> In other words, if FQDN are presents in Route headers, they are
>> compared to local IP addresses (well visible in logs), so, this never
>> matches and you get a "WARNING:rr:after_loose: no socket found to
>> match 2nd RR"
>> This has never been a limitation until I had to work with Microsoft
>> TEAMS, that requires the use of FQDN in Route headers.
>> I tried using aliases, Route headers tags, and lots of other things,
>> without success…
>> Even if aliases would have been a solution, that is not a scalable
>> solution when using OpenSIPS as a multi-tenant SBC for Teams (as
>> aliases changes require an OpenSIPS restart).
>> The only workaround I found was rewriting $du and $socket (so
>> partially reimplement loose_route() ) based on context values stored
>> in dialog variables (that’s working quite well anyway).
>> Many people seems to use OpenSIPS successfully with TEAMS and nobody
>> seems to have publicly complained about such limitations on forums.
>> I may have missed something, and so I wonder what can be done to
>> better work with Route headers.
>> Do anybody have any idea on what I may have missed?
>> Thank you for your advices and comments.
>> Daren
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