[Serusers] NAT

[Sebastian Kühner]

Can I "show" the Cisco (the PSTN Gateway) that I want to have symetric RTP??
(with the rtpproxy)


----- Original Message ----- 
From: <xwang at cascotec.com>
To: "Sebastian Kühner" <skuehner at veraza.com>; <serusers at lists.iptel.org>
Sent: Thursday, July 21, 2005 3:06 PM
Subject: RE: [Serusers] NAT


> Using 'restricted cone NAT',
> 1. IP address must be the same from external hosts. In other words, PSTN
> gateway must be on SER proxy.
> 2. using STUN might work too.
>
> 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 10:36 AM
> To: serusers at lists.iptel.org
> Subject: Re: [Serusers] NAT
>
>
> 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
> >
> >
> > _______________________________________________
> > Serusers mailing list
> > serusers at lists.iptel.org
> > http://lists.iptel.org/mailman/listinfo/serusers
> >
> >
> >
>
>
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