At 03:53 AM 10/02/2006, you wrote:
Hi Roman,
... delete...
If your network includes Asterisk, an IAX softphone would avoid this
trouble.
You can use any standard H.323 softphone/IP phone. GNUGK has very good NAT
detection apparatus and will automatically proxy calls from the NATed
Endpoints.
Although SIP has the same problem as H.323 in this regard, you may
be able to configure Asterisk and/or SER to deal with this issue,
without having to write any new code.
If you want to receive calls behind a NAT then you can just use a free
GNUGK Nat-Aware softphone which will work without any need for
configuration. You can also use any H.323 softphone/IP phone and just port
forward in your NAT.
If all else fails, you could use a VPN.
If you want encryption then there is a free H.323 secure softphone
available that are fully interperable with GNUGK and other H.323 equipment
so you would never ever need a VPN.
Simon
Good luck,
Stewart
----- Original Message -----
From: "Roman Rusakov" <roman@xxxxxx>
To: <openh323gk-users@xxxxxxxxxxxxxxxxxxxxx>
Sent: Thursday, February 09, 2006 4:46 AM
Subject: RTP problem with some NAT
> When I use a SoftPhone behind NAT, I have following problem:
>
> RRQ packet was sent from 192.168.x.x:4751(external IP:195.128.52.250) ==>
194.242.x.x:1719
> OK, GnuGK understand, what endpoint is behind NAT, and ready to
> receive RTP packets from other port then specified in FastStart.
> As I understand, function, responsive for it is
> UDPProxySocket::ReceiveData():
> ===
> // Workaround: some bad endpoints don't send packets from the specified
port
> ===
> But some bad providers have strange routes, and RTP packets sent from
> 192.168.x.x:5000 came from 87.251.133.254:5000 (alternate route) - not
> from 195.128.52.250!!!
> GnuGK forwards RTP packets from gateway 194.242.33.101 to
195.128.52.250:5000
> OK, we assume NAT preventing ports, but ready to change port
> And GnuGK forwards RTP from 87.251.133.254:5000 to 195.128.52.250:5000
> (i.e. to /dev/null)
>
> ===
> ProxyRTP(0) 1 sockets selected from 2, total 2/0
> RTP Forward 194.242.33.101:27862 to 195.128.52.250:5000
> 195.128.52.250:5000<=>194.242.x.x:53016<=>194.242.33.101:27862 84 bytes
sent
> ProxyRTP(0) 1 sockets selected from 2, total 2/0
> RTP Forward 194.242.33.101:27862 to 195.128.52.250:5000
> 195.128.52.250:5000<=>194.242.x.x:53016<=>194.242.33.101:27862 84 bytes
sent
> ProxyRTP(0) 1 sockets selected from 2, total 2/0
> RTP Forward 194.242.33.101:27862 to 195.128.52.250:5000
> 195.128.52.250:5000<=>194.242.x.x:53016<=>194.242.33.101:27862 84 bytes
sent
> ProxyRTP(0) 1 sockets selected from 2, total 2/0
> RTP Forward 87.251.133.254:5000 to 195.128.52.250:5000
> 195.128.52.250:5000<=>194.242.x.x:53016<=>194.242.33.101:27862 84 bytes
sent
> ProxyRTP(0) 1 sockets selected from 2, total 2/0
> RTP Forward 194.242.33.101:27862 to 195.128.52.250:5000
> 195.128.52.250:5000<=>194.242.x.x:53016<=>194.242.33.101:27862 84 bytes
sent
> ProxyRTP(0) 1 sockets selected from 2, total 2/0
> RTP Forward 87.251.133.254:5000 to 195.128.52.250:5000
> 195.128.52.250:5000<=>194.242.x.x:53016<=>194.242.33.101:27862 84 bytes
sent
> ProxyRTP(0) 1 sockets selected from 2, total 2/0
> RTP Forward 194.242.33.101:27862 to 195.128.52.250:5000
> 195.128.52.250:5000<=>194.242.x.x:53016<=>194.242.33.101:27862 84 bytes
sent
> ProxyRTP(0) 1 sockets selected from 2, total 2/0
> RTP Forward 87.251.133.254:5000 to 195.128.52.250:5000
> 195.128.52.250:5000<=>194.242.x.x:53016<=>194.242.33.101:27862 84 bytes
sent
> ===
>
> I think UDPProxySocket::ReceiveData() must be more robust for this
> type of provider's behavior. If endpoint is behind NAT, GnuGK must not
> believe on any address/port values, this values must be fully
> autodetected.
>
> --
> Best regards,
> Roman mailto:roman@xxxxxx
>
>
>
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