[SR-Users] UAC_AUTH with RTPEngine NAT

[Yuriy Gorlichenko]

You won't see proper $mb after rtpengine changes in that way. $mb will be
rewritten on the latest stage of packet processing. See sngrep or wireshark
or either use read_sdp_pv / write_sdp_pv

Also our can use apply_message_changes before log, but I would not
recommend to do so if this is a production under load.

On Fri, 2 Jul 2021, 10:28 Paul Smith, <paul.smith at claritytele.com> wrote:

>
> Hi,
>
> [Note I posted this yesterday from the wrong email address.]
>
>
> I am struggling to see why my SDP is not being set correctly on the INVITE
> to my supplier with Proxy-Authentication when I use uac_auth().
>
> The initial INVITE to my supplier has correct SDP set by rtpengine_manage.
> Then supplier replies with a 407.  My failure route correctly handles the
> Auth, and also calls NATMANAGE again... but this time the SDP is unchanged
> and the private IP and original media information from the original device
> is relayed to my supplier.
>
> kamailio.cfg isbased on the default config.  Running kamailio 5.4.6 and
> using example from uac module for uac_auth.
>
> My failure route calls NATMANAGE.  Is there anything special about
> uac_auth?  Do I need some extra magic to apply the message body changes
> after I have run rtpengine_manage().
>
>
> I can see that the NATMANAGEr test for nat_uac_test("8") is true, and
> rtpengine_manage() s being called.  But the outgoing SDP is not changed.
>
>
> Thanks for any hints!
>
> Paul
>
>
> ====================
>
> Extract of kamailio.cfg
>
>
> failure_route[TRUNKAUTH] {
>
>     if (t_is_canceled()) {
>
>         exit;
>
>     }
>
>     route(NATMANAGE);
>
>     xlog("L_INFO","In failure route, just finshed NATMANAGE and now body is $mb");
>
>     if(t_check_status("401|407")) {
>
>         # $avp(auser) = "test";
>
>         # $avp(apass) = "test";
>
>         # $avp(apass) = "36d0a02793542b4961e8348347236dbf";
>
>         if (uac_auth()) {
>
>                 t_relay();
>
>         }
>
>         exit;
>
>     }
>
> }
>
>
>
>
>
>
>
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