Private Telecommunication Network (PTN); Specification, functional models and information flows; Do not disturb and do not disturb override supplementary services
专用电信网(PTN);规范、功能模型和信息流;请勿打扰和请勿打扰覆盖补充服务
Contains stage 1 and 2 description of the do not disturb supplementary service and the do not disturb override supplementary service. See ECMA DTR/ECMA-0002 (ECMA-TR/SVC) for a description of these supplementary services. See ENV 41 005 for definition of stage 1 and 2