This Recommendation specifies features to be incorporated in DCEs intended for use in, or communicating with, text telephones primarily used by the deaf and hard of hearing. One of the goals of this Recommendation is to provide a platform on which a universal text telephone can be built. To accommodate this goal, procedures for interworking with identified existing text telephones are provided in clause 5. In addition, this Recommendation has the goal of identifying ways in which the multimedia Recommendations could be used to support new modes of operation or create new multi-mode text telephone devices. To accommodate this additional goal, clause 6 identifies some possible uses of this technology to support text telephony and additionally specifies requirements for multi-mode text telephone devices.
ITU-T V.18 FRENCH-2000 history
2000ITU-T V.18 FRENCH-2000 Operational and interworking requirements for DCEs operating in the text telephone mode