On Tue, 10 Jun 2008, David Villasmil wrote:
True (about getting the IP from the register), but that's putting more processing on the server, I'd rather let ths UAC do the ip resolution when we're talking thousands of clients (Which I am)
The behavior I described is made on the client/endpoint which look at the received and rport in the answer to a request sent to the server. (and this is not a DNS resolution: this is just "looking at"...)
The server in this case don't have any processing to do anymore: he always receive the correct contact header.
No need for STUN to have a correct IP/port for SIP even behind symmetric NAT. ;)
tks, Aymeric MOIZARD / ANTISIP amsip - http://www.antisip.com osip2 - http://www.osip.org eXosip2 - http://savannah.nongnu.org/projects/exosip/
Cheers
On Tue, Jun 10, 2008 at 1:59 PM, Aymeric Moizard jack@atosc.org wrote:
Stun can work even behind symmetric NAT if the stun server was running on the same socket the SIP server is running... I hope this feature will come soon!
I can help with this.
Also, SIP don't need to use STUN to work: you can discover your IP address and port very easily by looking at the REGISTER answer or OPTIONS answer which contains the "received" and "rport" parameter.
Of course, symmetric NAT are a nightmare for RTP, but not for SIP...
tks, Aymeric MOIZARD / ANTISIP amsip - http://www.antisip.com osip2 - http://www.osip.org eXosip2 - http://savannah.nongnu.org/projects/exosip/
On Tue, 10 Jun 2008, Iñaki Baz Castillo wrote:
El Tuesday 10 June 2008 10:44:51 Ali Jawad escribió:
Hi All
I had a lot of problems with STUN and symmetric NAT. The thing is that it does not always work with symmetric NAT. That would be mostly routers based on Linux IPTABLES.
STUN **CANNOT** work with symetric NAT. The NAT router maps the internal port with a different public port *depending* on the destination IP:port, so STUN can't work.
-- Iñaki Baz Castillo ibc@in.ilimit.es
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Aymeric Moizard