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

[John Burke]

Hey Daren,

Aliases should work I believe, however, you can also use the domain module[1] to dynamically maintain “local” FQDNs.

[1] https://opensips.org/docs/modules/devel/domain.html

Sent from my iPhone

> On Feb 21, 2023, at 8:33 AM, Daren FERREIRA <darencrew at hotmail.com> wrote:
> 
> 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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