29 Jun
2005
29 Jun
'05
7:38 a.m.
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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