I use Ubuntu 12.10 and it is hardly possible to make calls via Jitsi due
to echo. The other side of the calls uses Ubuntu 12.04. and has
got the same problem.
At Jitsi preferences, in the audio-section, there is no
echo-cancellation box or anything similar. I use the options PulseAudio
and internal audio.
I've already tried different codecs, without any difference.