[Serusers] help! lost invites when using outbound proxy

[Greger V. Teigre]

Yes, record routing should be honored by the softswitch.  You could of 
course also rewrite the contact, but you then have to rewrite it back before 
relaying to the phone.

To the discussion on dedicated outbound proxy (i.e. not directly related to 
the lost invite): There was a discussion on serusers on using Path to 
implement a dedicated outbound proxy (i.e. separate ob and registrar). 
Since then Fermin has submitted a path module to the experimental directory. 
Trying to implement the dedicated outbound proxy scenario with the new path 
module is on my to-do list, but...
    I'm sure Fermin will appreciate some tests on his module.  :-)
g-)

jeff kwong wrote:
> Hi everyone!
>
> I have set up a ser as an outbound proxy with nathelper+rtpproxy. This
> is my set up
>
> IPphone1 -->
>                    nat router --> outbound proxy(OP) -->
> softswitch(SS) IPphone2 -->
>
> with the OP and SS in public. The IPphones are behind the same NAT and
> both configured to the same OP.  I am only testing against this
> softswitch from some vendor so i don't  have any control over it. And
> I used the sample nathelper.cfg from the CVS to get started.
>
> Registration went smoothly. The problem starts when I try to call one
> phone using the other. Nothing happens until I recieve a 408 request
> time out. I did dumps on the OP and
> NAT router and what happens is the that the SS sends the INVITE to the
> NAT router directly instead of sending it to the OP. I tried reading
> the RFC but since im still new with sip and ser i am still at lost.
> Maybe someone here can help enlighten me. On sending INVITES, where in
> the SIP messages does the SS knows where to send the INVITE? Is it
> suppose to send back on what's in the Contact Header in registration?
> Would a Record-Route help solve the problem? Here's a rough
> description on what happens on the INVITES on phone1 calling phone2:
>
> IPphone1 --> NAT --> OP                 --> SS
>                                Adds: Via
>                                Changes Contact with source ip
>
> IPphone1 <-- NAT <--  OP                  <-- SS
>    407         407        407                     407
>                                Removes Via
>
> IPphone1 --> NAT --> OP                   --> SS
> Invite with                  Adds Via
> Authorization             Changes Contact with
>                                source ip
>
>           (lost) NAT <------------------------------ SS
>             sees 3 Vias
>
> Thanks in Advance for any help or ideas.
>
> Regards,
> CGR
>
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