10 Nov
2005
10 Nov
'05
1:54 p.m.
I saw the config files examples and adapted one of them with my own
configuration because I need to use SER Proxy as a simple proxy which
support NAT traversal... To process REGISTER requests or INVITE
requests, I got a SIP¨Server on another entity.
The scheme for my problem is the following :
UAC 1 ------ \
\
|------- NAT ---- SER Proxy ---- SIP Server
/
UAC 2 ------ /
REGISTER requests from UAC1 and UAC2 are processing correctly to SIP
Serever via SER Proxy. But when I'm trying to do a call from UAC1 to
UAC2, things are going bad.
Indeed, the first INVITE request from UAC1 is going to SIP Server via
SER Proxy but when SIP Server process the INVITE request, he's trying to
forward the INVITE Request directly to UAC2 without passing by SER Proxy...
The result is NAT don't allow INVITE request to go to UAC2 and the call
can't be done.
So, is there a way to force my SIP Server to do the INVITE request to
UAC2 via SER Proxy ? by doing a different REGISTER request or INVITE
request ?
Thanks,
Greger V. Teigre a écrit :
Anthony,
If the only thing you want to do, is NAT traversal, then that's been
done before. Have a look at http://onsip.org/ The Getting Started
document and config files explains how to do NAT traversal with
rtpproxy and mediaproxy.
g-)
----- Original Message ----- From: "Anthony Chapellier"
<anthony(a)mbdsys.com>
To: <serusers(a)lists.iptel.org>
Sent: Wednesday, November 09, 2005 3:38 PM
Subject: [Serusers] Rewriting SDP Infos for NAT Traversal
--
M. Anthony Chapellier
---------
MBDSYS SARL
139, avenue Paul Vaillant Couturier
93120 LA COURNEUVE
FRANCE
Tel : +33 (0) 148 35 20 46
Fax : +33 (0) 148 37 79 28
http://www.mbdsys.com
Hi,
When an INVITE request is incoming, I need to rewrite VIA Header
Field, Contact Header Field, (c=) field in SDP message core and (o=)
field in SDP message core too with IP public adress of UAC. Those are
needed by my SIP Server before SER Proxy forward the request to him.
I got some success with rewriting Contact Header File by using
fix_nated_contact() function and (c=) field with fix_nated_sdp("1")
function. But I don't succeed at all in rewriting (o=) field and
partially for VIA Header Field.
To do so, I tried to use the following function :
fix_nated_sdp("8"); No Result :(
forcerport(); It seems to add real IP public adress
and port in VIA header field but
it's not rewriting IP private adress
So, finally is it the good way to do this thing or is there something
wrong with my behaviour ?
Thanks,
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