Re: [SR-Users] Kamailio and NAT

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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