[Serusers] NAT

[Sebastian Kühner]

Hi!

I'm forwarding to the Gateway. I can forward it with a symmetrical cone nat
now,
too. But with a Port Restricted Cone NAT no... this is my last problem I
hope.

Here my routing:

if (isflagset(6)) {
    force_rtp_proxy();
    t_on_reply("2");
    append_hf("P-Behind-NAT: Yes\r\n");
    append_hf("P-hint: GATEWAY\r\n");
};

if (method=="INVITE") {
    record_route();
    setflag(1);
    if (uri=~"sip:00") {
        strip(3);
        prefix("xxxx");
        rewritehostport("xxx.xxx.xxx.xxx:5060");
    };
};

...

if (!t_relay()) {
    sl_reply_error();
    break;
};

...
onreply_route[2] {
    if (status=~"2[0-9][0-9]") {
        force_rport();
        fix_nated_contact();
        if (search("User-Agent: Cisco ATA.*")) {
            fix_nated_sdp("2");
        };
        force_rtp_proxy();
    };
}

Are there any flags to be set??

Thanks!

Sebastian




----- Original Message ----- 
From: <xwang at cascotec.com>
To: "Sebastian Kühner" <skuehner at veraza.com>
Sent: Thursday, July 21, 2005 1:36 PM
Subject: RE: [Serusers] NAT


> "A restricted cone NAT is one where all requests from the same internal IP
> address and port are mapped to the same external IP address and port.
Unlike
> a full cone NAT, an external host (with IP address X) can send a packet to
> the internal host only if the internal host had previously sent a packet
to
> IP address X"
>
> do you forward calls from SER proxy to Gateway or call to Gateway
directly?
>
> steven
>
> -----Original Message-----
> From: serusers-bounces at iptel.org [mailto:serusers-bounces at lists.iptel.org]On
> Behalf Of Sebastian Kühner
> Sent: Thursday, July 21, 2005 8:14 AM
> To: serusers at lists.iptel.org
> Subject: [Serusers] NAT
>
>
> Hi!
>
> Another problem with NAT... I hope I will solve it soon!
>
> My rtpproxy is running and ser can connect to the rtpproxy. I can make
calls
> to users that are connected to the ser server behind a NAT (Restricted
Cone
> NAT and symmetrical NAT). That's working fine!!! Thanks for your help!!!
>
> But I have the problem that if I want to call to a Cisco PSTN-Gateway,
that
> I can establish the call... but I don't hear anything. The callee is
hearing
> me. What is the difference between an internal user and the Gatway?? The
> routing for Gateway and Users is almost equal (the only difference is the
> "P-hint: GATEWAY").
>
> And: I'm wondering why the communication is OK with a symmetrical NAT
> (Linksys) and WITHOUT rtpproxy. If I turn on the rtpproxy (with symetrical
> NAT) the voice stream of the Gateway isn't arriving anymore.
>
> Any ideas?
>
> Thanks!
>
> Sebastian
>
>
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>
>