研究引入包含所有ISDN补充业务之间业务交互的单独文件的可能性。在当前的方法中，每个相关补充服务的标准中都描述了交互，因此很难跟踪文本的最新版本。本试验文件将包含与第3阶段互动文件最新草案相同的一套经批准的补充服务。在本试验期内，当前的方法将保持平行，即对于目前正在工作的补充服务，在每个补充服务的标准中描述了相互作用。 参考文件:EN 300 195-1 V1。4.1/1998-06.

To study the possibility of introduction of a separate document containing service interactions between all ISDN supplementary services. With the current approach, where the interactions are described in the standard of each supplementary service concerned, it is hard to keep track of where the latest version of the text is located. This trial document will contain the same set of approved supplementary services as the latest draft of the respective stage 3 interaction document. For this trial period the current approach will kept in parallel, i.e. for the supplemantary services currently under work, the interactions are described in the standard of each supplemenatry service. Reference document: EN 300 195-1 V1.4.1/1998-06.