[OpenSIPS-Users] topology hiding in opensips

[Bogdan-Andrei Iancu]

Hi,

It should be ok, but in your case the TH will not benefit from the 
dialog module (you do not use it) - all the info to he hidden will be 
appended to the Contact hdr (as extra param), while when using the 
dialog support, this info is stored into the dialog.

To be honest, I never tried the combination of nathelper and TH 
_without_ dialog support. But give it a try...if you get a trace, I can 
check if ok.

Regards,

Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
http://www.opensips-solutions.com

On 01/24/2017 02:03 PM, Alberto Gonzales wrote:
> Thanks Bogdan, Well, I have fix_nated_contact() at the very top of my 
> script :
>
> route{
>
>        force_rport();
>        if (nat_uac_test("23")) {
>            fix_nated_contact();
>            setflag(NAT);
>        }
>
>
>        if (!mf_process_maxfwd_header("10")) {
>                sl_send_reply("483","Too Many Hops");
>                exit;
>        }
>
> ....
> ....
>         if (has_totag()) {
> # sequential request withing a dialog should
> # take the path determined by record-routing
> #### remplazar : if (loose_route()) {
> if (topology_hiding_match()) {
>
> ...
> ...
> *## esconder topologia antes de pasar la llamada*
> topology_hiding("UC");
>        route(RELAY);
> }
>
> so is my script correct ?
> I just want to make sure I have a correct script before I do any 
> further work on this.
>
> Thanks.
>
> On Tue, Jan 24, 2017 at 11:52 AM, Bogdan-Andrei Iancu 
> <bogdan at opensips.org <mailto:bogdan at opensips.org>> wrote:
>
>     Hi,
>
>     You can do TH with nathelper, BUT be sure to create the dialog +
>     TH AFTER doing the fix_nated_contact().
>
>     Regards,
>
>     Bogdan-Andrei Iancu
>     OpenSIPS Founder and Developer
>     http://www.opensips-solutions.com <http://www.opensips-solutions.com>
>
>     On 01/20/2017 12:42 PM, Alberto Gonzales wrote:
>>     We used instruction in the book, which states at the end of the
>>     paragraph this :
>>     Topology hiding limitations
>>     You cannot easily combine topology hiding with NAT traversal
>>     because both the
>>     processes mangle the Contact header. Topology hiding will not
>>     hide the address and
>>     other information contained in other headers such as the display
>>     in the From header.
>>     To change the From header, you can use the uac_replace_from()
>>     function.
>>     I think our problem comes from the fact that we are using
>>     nathelper and also an rtpproxy in our script.
>>     can anyone provide help about activating topology hiding along
>>     with nathelper ?
>>     thanks in advance.
>>     On Fri, Jan 20, 2017 at 10:14 AM, Alberto Gonzales
>>     <albertosgonzale at gmail.com <mailto:albertosgonzale at gmail.com>>
>>     wrote:
>>
>>         I forgot to mention that doing this resulted in opensips
>>         crashing after 20 minutes :)
>>         On Fri, Jan 20, 2017 at 9:56 AM, Alberto Gonzales
>>         <albertosgonzale at gmail.com
>>         <mailto:albertosgonzale at gmail.com>> wrote:
>>
>>             Hello grupo,
>>             We have configured topology hiding in opensips 2.2 this
>>             way :
>>             please confirm to us this is the only thing we need to do
>>             or is there anything else that needs to be added.
>>             route {
>>             ....
>>             ....
>>                     if (has_totag()) { # sequential request withing a
>>             dialog should # take the path determined by
>>             record-routing #### remplazar : if (loose_route()) { if
>>             (topology_hiding_match()) { ...
>>             ...
>>             *## esconder topologia antes de pasar la llamada*
>>             topology_hiding("UC");       route(RELAY);}
>>             also what could be a quick test to see if this hiding is
>>             working or not.
>>             thanks in advance.
>>             Alberto
>>
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