If I don't talk from the legA no sound can be
listen.
do I need to set a special vars to listen legB as
soon as it answers ?
I don't use any vad.
Watch the logs when you make one of these calls. See if when legA
speaks the first time, there is immediately a green line in the log
saying something about changing ports.
If it is, then look for 'comfort noise' settings on the device that is
legA, could also be listed as a bandwidth preservation mechanism. Turn
it off.