Hi,

to force kamailio to use, for outbound connections, a specific tcp port (define in a "listen" directive), you have to set the reuse_tcp_port parameter (https://www.kamailio.org/wiki/cookbooks/5.5.x/core#tcp_reuse_port).

Cheers,

Federico

On Wed, Nov 10, 2021 at 4:36 PM Ross McKillop <ross@rsmck.co.uk> wrote:

Hi All,

Try as I may I cannot force an outbound TCP request to use a non-ephemeral source port.

Looking at the documentation it seems that as long as I have a line like

listen=tcp:10.30.0.55:3339

I should be able to force an outbound connection to originate from that host and port, i.e. to establish a persistent connection from a specific socket to a remote host, but having tried to set it via $fs and set_send_socket() it always uses an ephemeral port.

Ideally I would like kamailio to use a specific source port for contacting a specific remote host and keep the TCP socket established, and it seems like it should be simple enough to do but it's not working as expected.

Best,
Ross

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