11 Apr
2005
11 Apr
'05
11:38 p.m.
Andres wrote:
Wouldnt it be a good idea to document such things, ie create a
repository about what NAT devices actually work.
Just an easy list of
Vendor, Modell, NAT type, Work [yes|no], Any special step needed to get
it to work etc.
I wouldnt mind help administering it, if it maybe could be hosted on
onsip.org or similar sites.
Pedro
It is worse than that. The STUN taxonomy is
brittle, there are NATs
which feature different behaviour than anticipated in RFC3489.
Right. There is one we like to call the crap-nat. This nat changes the
source UDP port every few seconds. So once the media flow is
established it only works for 2-3 seconds until the nat switches to
another source port. Needles to say there is absolutely no way to make
VoIP work unders these conditions. We encounter one of these every few
weeks, and the only solution is to have the customer change the NAT
device he is using. (these are usually ADSL modems with inbuilt router)