[SR-Users] Source Port on TLS OPTIONS from Dispatcher

[Joel Serrano]

Hi Charles,

I don't think your issue is rport, make sure you are setting the Contact
header correctly.

Have you checked this blog post:
https://skalatan.de/en/blog/kamailio-sbc-teams ?

There is a specific section that talks about how to tell Kamailio to send
the OPTIONS like MS Teams wants them.

Good luck,
Joel.

On Thu, Jan 7, 2021 at 4:32 PM Charles Phillips <charles at rustybike.com>
wrote:

> Hello all.  As they say in radio, “long time listener, first time caller”
>
> Anyway, I am having trouble getting past the following road block and any
> help would be greatly appreciated.
>
> Kamailio version is 5.4.3
>
> When attempting to use dispatcher to send OPTIONS packets to several TLS
> destinations, the packets are leaving the Kamailio server on random ports.
> This is a problem because the servers I am sending the OPTIONS to (MS
> Teams) are enforcing rport so the responses are returned to a port that
> Kamailio is not listening on.  I have tried to force the socket in the
> event route (relevant parts of snippet below) but it does not appear to
> help.  I should also mention that I am not behind NAT and the TLS socket is
> specified in the dispatcher attrs.
>
> event_route[tm:local-request] {
>     sip_trace();
>
>
>     $fs = “tls:**ip-address**:5061”;
>
>
> }
>
> I have used Kamailio as a TLS server for many projects, but this is my
> first time as a client.  I am sure I am missing something.
>
> - Charles
>
>
>
>
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