[SR-Users] Debian: Kamailio: -> FIN - SYN -> on new port

[Yuriy Gorlichenko]

Usually Kamailio tries to establish connection with the port was described
in latest contact from client. Whydo you expect to call other port?

And the second question - there are keepalive tcp mechanics available at
the kamailio side and reuse port as well. Why not use it to avoid
reistablishing connection?

On Thu, 26 May 2022, 08:04 Kevin Browne, <ktjbrowne at gmail.com> wrote:

> Hi, am looking for some specific Kamailio help i cant seem to find
> anywhere (
>
> #
>
> running Kamailio on Debian/buster ...
>
> ##
>
> after receipt of tcp FIN, port is closed.
>
> when signaling is required again from Kamailio side.
>
> Kam is attempting SYN on FINd (closed) port.
>
> this is rejected RST.
>
> How to change SYN to re-establish tcp on new ephemeral port?
>
>
> ##
>
> another description, same problem:
>
> FIN received from (external) cisco (call owner) due to port recycling, not
> to keep port open after x minutes. everything is as expected re ACKs and
> such.
> When Kam wants to send REFER to cisco after the FIN, tcp attempts a SYN
> (as we'd expect) but sends SYN on old closed port.
>
> ##
>
> Where to change this Kam/OS/other is where i'm attempting to identify,
> then figure how to change.
>
> Thank you.
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