[OpenSIPS-Users] Fixing the Contact Header for NAT

Juan Backson juanbackson at gmail.com
Thu Nov 27 13:30:42 CET 2008

Sorry for double posting for the same problem.  This second post was meant
to nail down on the exact issue for the first post.  I am very sorry for any
inconvenience caused.


In the 200OK received by the nated client, the Contact is :Contact: <
sip:1000 at>
Opensips did not add the Record-Route even though I did specify
fix_nated_contact in on_reply_route.  Do you have any idea why that is the

Thanks alot for all your help.


On Wed, Nov 26, 2008 at 7:47 PM, Iñaki Baz Castillo <ibc at aliax.net> wrote:

> El Miércoles, 26 de Noviembre de 2008, Juan Backson escribió:
> > I am having a problem with using B2BUA -> Opensips -> xLite behind NAT.
> > When the B2BUA sends back a 200OK, it is received by the SIP client
> behind
> > NAT, but the SIP client does not response properly with ACK when the
> xLite
> > is not in the same local LAN as the Opensips.  If xLite is connected
> within
> > the local LAN of Opensips, then xLite can response properly with ACK.  I
> > think this is due to Contact header not properly configured, but I did
> use
> > fix_nated_contact() inside the onreply_route[1].
> Well, how is the Contact the callee receives in the 200 OK?
> Does OpenSIPS add Record-Route?
> --
> Iñaki Baz Castillo
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