void connector_OnSessionParticipantAddedEvent(object sender, ParticipantAddedEventArgs e)
        {
            VoiceSession s = FindSession(e.SessionHandle, false);

            if (s == null)
            {
                Logger.Log("Orphan participant", Helpers.LogLevel.Error);
                return;
            }
            s.AddParticipant(e.URI);
        }