> -----Original Message----- > > Gordon Henderson > Sent: 25 January 2007 08:17 > > > On Wed, 24 Jan 2007, Yuan LIU wrote: > > > I have a really dumb question. It appears that Yahoo, MSN, AIM, you > > name them, they don't have a NAT problem, and some use SIP. I don't > > think they all stay in voice path, either. What takes? > > Their SIP servers aren't behind NAT firewalls, so the problem > shifts from them to you ... > > In the UK, there is a good number (100's of thousands? More?) > of ADSL customers who also connect their PC directly to the > 'net (via free USB adapters that most ISPs supply) so in this > situation you could well be using a soft-phone on one PC to > talk to another soft-phone on another PC, both directly > connected to the net without NAT, using a non NATted SIP > server of some kind to setup the call, then data doesn't need > to be hairpinned via the SIP server. > > And they are possibly using proprietary clients that know > more about NATting than a generic SIP client might, so can > use this to avoid NATting issues too... > > Gordon > _______________________________________________ > --Bandwidth and Colocation provided by Easynews.com -- > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users >
The other thing with programs such as MSN Messenger etc. is that many now support UPNP (I know for a fact MSN Messenger does), and most consumer ADSL boxes and routers also have UPNP enabled, so the NAT / firewall ports _are_ being opened & redirected, but without any user intervention... Robert Jenkins. _______________________________________________ --Bandwidth and Colocation provided by Easynews.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users