It appears you are using a vendor specific softphone which has a media
proxy but not signalling proxy. So the signalling is coming directly from
the NATed EP however the media is being proxied through another IP
address. The problem appears that the endpoint is not sending the
correct or omitting the H245_TransportAddress for the RTP proxy in the
OLCack. This is definitely a problem in the softphone. If the provider was
to proxy call signalling then this problem would most likely be fixed.
But to allow GNUGK to detect RTP packets from anywhere and fully
autodetect? This maybe a little dangerous. That decision to make the change
would be up to Jan.
Simon
At 08:46 PM 9/02/2006, you wrote:
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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