The issue of costs of the communication may be a consideration, especially where many parties are affected and a means of communication is used that entails, in some States, relatively high costs, such as videoconferencing.
30. 联系的费用问题可能是一个考虑因素，特别是在受影响的当事人多且使用的信手段如电话会议在某些国家费用相对较高的情况下。