[Serusers] Rewriting URI in the Contact field

[Nils Ohlmeier]

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Jan just told me that responses are not processed by the script.
Sorry, my fault.

  Nils

On Monday 13 January 2003 00:20, Nils Ohlmeier wrote:
> On Sunday 12 January 2003 23:44, Jan Janak wrote:
> > On 12-01 23:25, Maxim Sobolev wrote:
> > > Everything works just fine when I'm calling from UA1 to UA2, i.e.
> > > from behind the NAT to the "outside world", however there are
> > > some problems when I'm doing it in reverse direction. The problem
> > > is that OK INVITE that the UA1 sends in reply to UA2's INVITE when
> > > the user picks up the phone is not passed to my helper functions
> > > and hence UA2 makes a wrong conclusion about where to send ACK and
> > > BYE to.
> > >
> > > Do you have any ideas on how to overcome this problem?
> >
> >   If I get you right, you need to rewrite Contact in 200 OK response to
> > INVITE comming from the NATed user agent.
> >
> >   You can do this using TM and it's callbacks. TM is transaction module
> > and you can register callbacks with the module. Among others, there is a
> > callback that will be called upon reception of the final response (200 OK
> > in your case). In the callback, you can modify the response and rewrite
> > the contact.
>
> An alternative without additional programing could be to replace your
> search for the User-Agent (which is not realistic in any case) with a
> search for Contact from private adresses.
>
> if ((search("^(Contact|m): .*@(192\.168\.|10\.|172\.16)"))
>    && ( src_ip==192.168.0.0/16 || src_ip==10.0.0.0/8 ||
> src_ip==172.16.0.0/12 ))) {
> 	fix_nated_contact();
> }
>
> If you place this where it also catches 200 you should also be able to fix
> Contacts in the OK.
>
> Greetings
>   Nils

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