The problem refer to chat window with friend. There is Open call button (green). When I do fast recall eg disconnect/connect voice goes only from one side (my friend) not me or even nobody can receive voice. After several recalls only one side can speak until restart of whole program until long period (10 min or more). The text messages works fine and everything like dht indicator and connection over NAT seems to be ok. On similar apps everything works ok (voice recorders, skype etc).