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: &lt;xwang(a)cascotec.com&gt;
To: "Sebastian Kühner" &lt;skuehner(a)veraza.com&gt;
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(a)iptel.org [mailto:serusers-bounces@lists.iptel.org]On
 Behalf Of Sebastian Kühner
 Sent: Thursday, July 21, 2005 8:14 AM
 To: serusers(a)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