PS. note that you are somewhat vague or confusing yourself, too. You say:
> I'm pretty sure I have a definitive answer.
A definitive answer for what? Or do you mean you don't have an answer?
> I installed version 3.2.6, and it consistently passed the echo test with
> several sites.
Which sites? Have you also tried the call back test on ekiga.net? (520)
> I have a Linksys WRT54GL, with no special provision for SIP--no ports open
> for incoming calls.
WRT54GL is running Linux (according to wikipedia), which should make
it's NAT implementation well-behaved; I've installed OpenWRT on my
WRT54G v3 and it worked without problem.
> I did not use STUN.
As I said Ekiga *does* use STUN in the newer versions automatically.
> Ubuntu Karmic was used with the firewall in default (ports closed) condition.
Aha? Well that might explain problems, no?
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