a） 研究在ITU-T.120系列建议中嵌入SBV可视图文协议，注意X.25和H.221并排；b） 结合STC TE4和TE10，并考虑到TC TE（12/94）关于初始优先级设置的决定，建立DTR/TE-01050中确定的可能场景的优先级列表。对于上述列表中最重要的场景:i）定义并描述与这些场景对应的不同服务；ii）指定相关的交互协议；iii）定义互通单元（如果场景需要）。 c） 研究可能场景对视听终端硬件和软件的可能约束。

a) Study the embedding of SBV videotex protocols within the ITU-T T.120 series of Recommendations, paying attention to X.25 and H.221 being side by side; b) In conjunction with STCs TE4 and TE10, and taking into account the decision of TC TE (12/94) on initial priority setting, establish a priority list of possible scenarios identified in DTR/TE-01050. For the top scenarios of the above mentioned list: i) Define and describe the different services corresponding to these scenarios; ii) Specify the associated interactive protocols; iii) Define the interworking units (if required by the scenario. c) Study the possible constraints of the possible scenarios on the hardware and software of audiovisual terminals.