#1 Gaim-vv 0.79-vv-3: video and sound doesn't work

[PhiL]

I definitly cannot manage to get any video or sound
with gaim-vv 0.79-vv-3 when connected with friend via MSN.
All compilations and install where fine.
Both options j2k codec and linphone-vv are selected
within the plugins preferences.
If I initiate a video or audio session, it appears as a
broken connexion for my friends. (they get an error
message)
If my friends initiate these same sessions, nothing
happen on my side.
(Of course, in both cases my friends and I have
accepted to open such sessions.)
I tried without any iptable rules and any filter in my
router (and it works under winblow)
PS: I did these tests without any webcam on my own site.