_addStream = function (o_view, o_stream, b_audio) {
            if (o_view) {
                attachMediaStream(o_view, o_stream);
                return (b_audio && o_stream && o_stream.getAudioTracks().length > 0) || (!b_audio && o_stream && o_stream.getVideoTracks().length > 0);
            }
        }
Updates or sets the session configuration.
@param {SIPml.Session.Configuration} configuration