研究将双模终端的DECT和GSM部分的功能进一步集成到TBR 39第一版中的可能性。这包括两种模式同时激活、高层交换和模式间切换等问题。此外，还考虑了使用高级双模终端的网络方面。对于DECT/DCS1800的双模终端和基础设施，以及DECT/GSM/DCS1800的三模终端，也应进行同样的考虑。 应确定进一步标准化的必要性，尤其是作为TBR 39第二版基础的最终ETS的内容。

To investigate the possibilities of integrating the functionalities of the DECT and GSM parts of dual-mode terminals further than is done in the first edition of TBR 39.This includes e.g. the issues of having both modes active simultaneously, swapping of the higher layers and handover between the modes. Also network aspects of the use of advanced dual-mode terminals is considered. The same consideration should be made for dual-mode terminals and infrastructure for DECT/DCS1800 as well as triple-mode terminals DECT/GSM/DCS1800. The need for further standardization should be identified, especially the contents of an eventual ETS as the basis for the second edition of TBR 39.