When you are running Kamailio behind a NAT you should use advertise parameter of listen address. According to documentation " A typical use case for advertise address is when running SIP server behind a NAT/Firewall, when the local IP address (to be used for bind) is different than the public IP address (to be used for advertising).". For example:

listen=udp:10.10.10.10:5060 advertise  11.11.11.11:5060

For more info refer to http://www.kamailio.org/wiki/cookbooks/3.3.x/core#listen

Regards

Gholamreza Sabery Tabrizy

On Wed, Jan 13, 2016 at 2:39 AM, Daniel-Constantin Mierla <miconda@gmail.com> wrote:

Hello,

can you get the SIP trace with all the packets of such dialog outside of the NAT router? It will help to see the headers and based on that we may be able to provide a solution.

Cheers,
Daniel
On 12/01/16 19:13, Nelson Migliaro wrote:
Thank you for your answer.

The problem I have is with internet router doing to PAT to SIP port.

I am already advertising public IP but unfortunately I cant know the public port I am using.

2015-12-28 18:17 GMT+01:00 Alexandru Covalschi <568691@gmail.com>:

AFAIK bye is usually sent to the address stored in record_route. Try setting changing record_route() to record_route_preset("PUBLICIP:5060;nat=yes:)

2015-12-23 16:28 GMT+02:00 Nelson Migliaro <eng.migliaro@gmail.com>:

Hello,

I am running Kamailio behind NAT.

Kanailio has a private IP and I am relaying NAT to internet router.

I am using:

- #!define WITH_NAT
- listen=udp:PRIVATE-IP:5060 advertise PUBLIC-IP:5060

- Patched RTP proxy including the advertise option

And everything goes fine. I can make calls and have two way audio.

The problem begins when the callee ends the call. BYE is not received in Kamailio (caller)

I included the public IP using "add_contact_alias" because "set_contact_alias" was not adding the public IP. I included this in in NATDETECT (pre loaded router)

        if(is_first_hop()) {
            xlog("L_NOTICE","Metodo: $rm \n");
            xlog("L_NOTICE","is first hop\n");
            #set_contact_alias();
                if (!add_contact_alias("PUBLIC-IP", "$Rp", "udp")) {
                xlog("L_ERR", "Error in aliasing contact $ct\n");
                    send_reply("400", "Bad request");
                            exit;
                    }
        }

I think the problem is related to destination that BYE is sent by the vendor. From what I see IP and port is taken from advertised in contact (PUBLIC-IP and 5060).
The problem is that internet router changes the source port.

Contact: <sip:999999999@PRIVATE-IP:5060;alias=PUBLIC-IP~5060~1>

--- Is it correcto to add_contact_alias("PUBLIC-IP", "$Rp", "udp") in order to received new transactions or should I follow a different procedure???

Thank you

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--

Alexandru Covalschi
ABRISS-Solutions
VoIP engineer and system administrator
phone: +37367398493
web: http://abs-telecom.com/

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-- Daniel-Constantin Mierla http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda Book: SIP Routing With Kamailio - http://www.asipto.com http://miconda.eu
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