Best FOSS alternative for skype?
lowen at pari.edu
Wed May 11 14:27:31 UTC 2011
On Wednesday, May 11, 2011 07:49:12 AM Alan Cox wrote:
> It's not really down to "FOSS alternatives". There are *standards* for
> voice over IP.
And thanks to NAT-hatred in the standards process, most of those require finagling firewall forwarding fritters..er... rules; H.323 for instance seems to be designed from the ground up specifically to break NAT, and requires some major work at the NAT box to make work properly. SIP and others as well.
So supporting VoIP from behind a typical residential NAT box isn't as straightforward as it could be; behind a Cisco or a well-configured Linux NAT box it's not hard.
Skype's big selling point is that it works just fine through NAT, even if the NAT is on both ends (NAT444), or on both ends and in the middle (NAT4444, CGN, etc)....and no special port-forwards or other applications-level gatewaying or any of those other tricks the *standard* VoIP protocols seem to require for no good reason....other than to break NAT.... :-)
Sorry, pet peeve there.
More information about the users