New subject: [Serusers] NAT

21 Jul 2005


      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@cascotec.com
To: "Sebastian Kühner" skuehner@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@iptel.org [mailto:serusers-bounces@lists.iptel.org]On
Behalf Of Sebastian Kühner
Sent: Thursday, July 21, 2005 8:14 AM
To: serusers@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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Re: [Serusers] NAT