Hello again

I have attached a Capture.

My public IP is 194.255.22.44, and I have a port forward of 5071 in my router

The Raspberry Pi running the Kamailio is on 192.168.2.9 with an alias 192.168.2.40

My listening is setup like this

listen=127.0.0.1:5071
listen=eth0:5071  advertise 194.255.22.44:5071
alias=194.255.22.44:5071

Kamailio is forwarding an invite from a door phone thus I also rewrite FROM:

uac_replace_from("sip:"+$dbr(ra=>[0,1])+"@194.255.22.44:5071");
And the failure route to
$fu = "sip:"+$dbr(ra=>[0,0])+"@194.255.22.44:5071";

In the route doing the INVITE I also set this:

set_advertised_address("194.255.22.44:5071");

Regarding tcp_reuse_port, if I set this I get this error, which I understand is due to the way TCP works.

Nov  4 18:38:41 scantronpbx /usr/sbin/kamailio[15864]: {1 ACK 16191 ACK C2Az-Xm2b0CEPyV5eQuz7yEf9IJo4PyJ} WARNING: <core> [core/tcp_main.c:1061]: tcp_do_connect(): binding to source address 192.168.2.40:5071 failed: Address already in use [98]

I do have tcp_reuse_port=yes with this capture. But much to my surprise, the 200 OK from is send to 37148, but the ACK to it comes from 37150

-------------------- Med Liberalistiske Hilsner ----------------------
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Hi,

I think you are searching for this parameter:

http://www.kamailio.org/wiki/cookbooks/devel/core#tcp_reuse_port

It basically tells the kernel not to choose a new port at random for a new connection, but it will try to reuse the existing port (in your case 5071).

Thanks,

Carsten

--

Carsten Bock I CTO & Founder

ng-voice GmbH

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Managing Directors: Dr. David Bachmann, Carsten Bock

Am Mi., 4. Nov. 2020 um 12:07 Uhr schrieb Kjeld Flarup <kjeld.flarup@liberalismen.dk>:

Hello

I have a Kamailio running behind NAT, which sends calls to a VOIP
service provider.

I have setup the Kamalio to listen on port 5071, and also setup a port
forward in the router.

Now the problem is that with TCP, 5071 is not used for the dialog, but a
new port is chosen everytime. This means that when the mobile phone
called hands up, I never sees the BYE, because BYE is a new dialog.


To which port is the server supposed to send the BYE, and what field
tells the server this.


--
-------------------- Med Liberalistiske Hilsner ----------------------
    Civilingeniør, Kjeld Flarup - Mit sind er mere åbent end min tegnebog
    Sofienlundvej 6B, 7560 Hjerm, Tlf: 40 29 41 49
    Den ikke akademiske hjemmeside for liberalismen - www.liberalismen.dk


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