[SR-Users] Issue with 4.2.0 and nathelper and/or rtpproxy

[Igor Potjevlesch]

Hello,

 

Just to let you know that I tried also with 4.2.1 and the issue is the same.

Regards,

 

Igor.

 

De : Igor Potjevlesch [mailto:igor.potjevlesch at gmail.com] 
Envoyé : jeudi 20 novembre 2014 17:00
À : 'Kamailio (SER) - Users Mailing List'
Objet : RE: [SR-Users] Issue with 4.2.0 and nathelper and/or rtpproxy

 

Hello,

 

No one has experienced the same issue or similar until 4.2.0?

Regards,

 

Igor.

 

De : Igor Potjevlesch [ <mailto:igor.potjevlesch at gmail.com>
mailto:igor.potjevlesch at gmail.com] 
Envoyé : mercredi 19 novembre 2014 12:29
À : 'Kamailio (SER) - Users Mailing List'
Objet : RE: [SR-Users] Issue with 4.2.0 and nathelper and/or rtpproxy

 

Hello,

 

I reviewed the changelogs.

I can see the following updates that could change the previous behaviour:

 

commit 42897d422b60edeac393201326a3e71318445e62

Author: Daniel-Constantin Mierla <miconda at gmail.com
<mailto:miconda at gmail.com> >

Date:   Mon Sep 22 22:04:39 2014 +0200

 

    core: add received parameter to via if rport parameter is present

    

    - required by RFC3581, section 4.

    

    (cherry picked from commit a1e96cbd5a3b43598c59cb50693e6b739801b804)

 

            commit a52c0024723a59d90c3c3966d5deadaf8b0d4440

Author: Daniel-Constantin Mierla <miconda at gmail.com
<mailto:miconda at gmail.com> >

Date:   Sun Sep 28 12:48:53 2014 +0200

 

    core: helper functions to get addr and port to be used in signaling from
socket info

    (cherry picked from commit c725f1dec14863e069bfd1e5c26857a1005528d5)

 

But I can't explain why the same nat_uac_test doesn't behaves the same
between the two versions.

 

Regards,

 

Igor.

 

De : Igor Potjevlesch [ <mailto:igor.potjevlesch at gmail.com>
mailto:igor.potjevlesch at gmail.com] 
Envoyé : mardi 18 novembre 2014 14:00
À :  <mailto:amit at avhan.com> amit at avhan.com; 'Kamailio (SER) - Users Mailing
List'
Objet : RE: [SR-Users] Issue with 4.2.0 and nathelper and/or rtpproxy

 

Hi Amit,

 

The config is the same between the two version. Even this line.

 

Regards,

 

Igor.

 

De : sr-users-bounces at lists.sip-router.org
<mailto:sr-users-bounces at lists.sip-router.org>
[mailto:sr-users-bounces at lists.sip-router.org] De la part de Amit Patkar
Envoyé : mardi 18 novembre 2014 13:16
À : sr-users at lists.sip-router.org <mailto:sr-users at lists.sip-router.org> 
Objet : Re: [SR-Users] Issue with 4.2.0 and nathelper and/or rtpproxy

 

Hi

You should compare this line in your configuration file.

if (nat_uac_test("18")) {

It may be using different parameters.

Regards,

Amit 


  

On 11/18/2014 5:23 PM, Igor Potjevlesch wrote:

Hello,

 

I can reproduce the issue on a pre-production system.

So, I downgraded to 4.1.5.

 

Here is the difference:

The INVITE comes into NATDETECT:

 

route[NATDETECT] {

        xlog("ENTERING NATDETECT routes\n");

#!ifdef WITH_NAT

        force_rport();

        if (nat_uac_test("18")) {

                if (is_method("REGISTER")) {

                        fix_nated_register();

                } else {

                        add_contact_alias();

                }

                setflag(FLT_NATS);

                 xlog("NAT_UAC_TEST OK\n");

        }

#!endif

        return;

}

 

With Kamailio 4.2.0, the NAT_UAC_TEST returns true whereas with 4.1.5
returns false.

 

I also look at the “force_rport”. I’m not sure if it’s related, but with
4.2.0, the Via looks like:

Via: SIP/2.0/UDP
PST_GW:5060;received=PST_GW;rport=5060;branch=z9hG4bK-34d5-1416308856-4847-4
41\r\n

 

In 4.1.5:

Via: SIP/2.0/UDP
PST_GW:5060;rport=5060;branch=z9hG4bK-2e3d-1416311184-4886-146\r\n

 

The received parameters is not added. Note that PSTN_GW refers to a public
IP address (out of RFC1918 and Carrier Grade NAT).

 

Regards,

 

Igor.

 

De : Igor Potjevlesch [mailto:igor.potjevlesch at gmail.com] 
Envoyé : mardi 18 novembre 2014 11:43
À : sr-users at lists.sip-router.org <mailto:users at lists.sip-router.org> 
Objet : Issue with 4.2.0 and nathelper and/or rtpproxy

 

Hello,

 

Since I done the upgrade of Kamailio into 4.2.0, there are, at least, one
new case where the RTPProxy is launched.

 

When I got an INVITE from my PSTN Gateway, for unknown reason (and not for
all calls), Record-Route is append with nat=yes. I looked into an old trace
and this behaviour didn’t exist.

 

What could have changed that can explain this?

 

Regards,

 

Igor.

 

 

 

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