5 Oct
2004
5 Oct
'04
11:29 a.m.
Hi Mahesh,
force_rport() is used as a part of the NAT traversal solution. When a
request come across a NAT, the server will see a different port (the one
of the NAT), instead of the one advertise in VIA. And to be able to pass
the reply back to UAC (through NAT), the server MUST use the detected
NAT port (otherwise the NAT will not allow the message to pass).
best regards,
Marian
mahesh wrote:
Andrei,
Any significant reason on why this is being done??
Mahesh
At 08:59 PM 10/1/2004, Andrei Pelinescu-Onciul wrote:
On Oct 01, 2004 at 10:16, mahesh
<mahesha(a)intoto.com> wrote:
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Hi Andrei,
Thanks for the reply.
I am using the publicly available iptel proxy server(195.37.77.99)
to test
my implementation of SIP-ALG. I am using the
following configuration
HOST1(winXP)---FW---Internet---HOST2(winCP)
FW is the firewall/NAT device, which has the ALG implementation. I
am using
SJPhone on my hosts to communicate using
SIP(UDP). I observe that the
responses to requests sent by HOST1 come from the proxy(iptel) to the
source port(of FW), from which the request was sent, instead of on
VIA.
There is no "rport" field in the VIA
header field of the request.
Does anyone know if the iptel proxy server is configured to use
"force_rport".
Yes, it is.
Andrei