Re: Topos and TLS

I had the issue earlier today and it disappeared when I did a rebuild on the docker pulling the latest version. Hah, that explains it. I first through it was just randomly occurring but this explains it. I am now running 6.1.2 and haven’t encountered the issue since.



/M
From: Calvin E. via sr-users <[email protected]>
Date: Wednesday, 22 April 2026 at 20:15
To: Kamailio (SER) - Users Mailing List <[email protected]>
Cc: Calvin E. <[email protected]>
Subject: [SR-Users] Re: Topos and TLS


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6.1.2 was just released with the fix for this, 6.1.1 was dropping the port and transport when contact mode is 0. Without upgrading you can mitigate by setting contact mode to 1, but it will change the Contact in other ways that may or may not be compatible with your peers.

On Wed, Apr 22, 2026 at 9:21 AM Martin Nyström via sr-users <[email protected]<mailto:[email protected]>> wrote:
Hi,

How am I expected to handle TLS when using TOPOS?

listen=tls:192.168.5.122:5061<http://192.168.5.122:5061> advertise foobar.pbx.com:5061<http://foobar.pbx.com:5061>


modparam("topos", "storage", "db")
modparam("topos", "contact_host", “foobar.pbx.com<http://foobar.pbx.com>")
modparam("topos", "dialog_expire", 10800)


When using TLS, TOPOS sets the contact header as something like this for a 200 OK returned.
Contact: <sip:[email protected]<mailto:sip%[email protected]>>

Is this valid? Or should it not be foobar.pbx.com:5061;transport=TLS

It appears some vendors blindly use the contact header and returns the ACK for an example to a non TLS endpoint, despite the dialog (INVITE) starting out as TLS.


/M
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