Re: [Kamailio-Users] How to know if a UAC is behind NAT after fix_nated_register() ? - sr-users

13 Jul 2009

I answer to myself (it may help others) as I could test successfully the
configuration below. Also there is a typo (isbflagset instead of isflagset):

so when I detect a UA is behind NAT, I do:

        if (nat_uac_test("19")) {
                if (method=="REGISTER") {
                        setbflag(7);
                        fix_nated_register();
        ...

Then when my B2BUA sends invite to this UA I do (after lookup("location") ):

        lookup("location");
        ...
        if (is_method("INVITE")) {
                if (isbflagset(7)) {
                        setflag(5);

Regards,
Pascal

On Mon, Jul 13, 2009 at 2:43 PM, Pascal Maugeri &lt;pascal.maugeri(a)gmail.com&gt;wrote;wrote:

...
  I'm not that familiar with flag management.

 so when I detect a UA is behind NAT, I do:

         if (nat_uac_test("19")) {
                 if (method=="REGISTER") {
                         setbflag(7);
                         fix_nated_register();
         ...

 Then when my B2BUA sends invite to this UA I do (after lookup("location")
 ):

         if (is_method("INVITE")) {
                 if (isflagset(7)) {
                         setflag(5);

 Is that correct ?

 BTW, regarding the flag number, is there a table of reserved numbers ? Can
 I use "7" in this case ?

 -pascal

 On Mon, Jul 13, 2009 at 12:00 PM, Daniel-Constantin Mierla <
 miconda(a)gmail.com&gt; wrote:

  Hello,

 On 07/13/2009 11:54 AM, Pascal Maugeri wrote:

  Hi

 A quick question, when I apply a fix_nated_register() to a remote user
 when he/she registers, how can I know later on if this user is behind NAT ?
  set a branch flag for REGISTER before save location. After lookup location
 that flag is recovered and you can test it in the config file.

 Cheers,
 Daniel

  All my calls go through a B2BUA:

 Caller ------> kamailio/rtpproxy ------> B2BUA ------> kamailio/rtpproxy
 ------> Callee

 When my B2BUA calls a user, I want to know if this user is behind NAT or
 not. For now all the calls go through rtpproxy but I would like to apply
 this path only when user is behind NAT.

 Regards,
 Pascal

 ------------------------------------------------------------------------

 _______________________________________________
 Kamailio (OpenSER) - Users mailing list
 Users(a)lists.kamailio.org
 http://lists.kamailio.org/cgi-bin/mailman/listinfo/users
 http://lists.openser-project.org/cgi-bin/mailman/listinfo/users

 --
 Daniel-Constantin Mierla
 http://www.asipto.com/