That is very interesting.

I've added add_path_received in Kamailio config. And I can see that FreeSWITCH received it and reflected in registration info.

With SIP/UDP there is no problems. FreeSWITCH gets path and respnses and INVITEs goes through Kamailio.

But in case of TLS INVITES goes to Kamailio but FreeSWITCH tries to originate call with TLS.

Mybe this is FreeSWITCH issue. I'll check later.

2016-11-28 14:42 GMT+02:00 Daniel Tryba <d.tryba@pocos.nl>:

On Mon, Nov 28, 2016 at 01:15:03PM +0100, Daniel Tryba wrote:
> > UAC == SIP/TLS ==> Kamailio == SIP/UDP ==> FreeSWITCH
> >
> solution is to use Path on the frontend/loadbalancer.

According to this closed bug report it should work for
Kamailio/Freeswitch:
https://freeswitch.org/jira/si/jira.issueviews:issue-html/FS-4989/FS-4989.html

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С уважением,
Владислав Захожай