Private Telecommunication Network (PTN); Specification, functional models and information flows; Call intrusion supplementary service
专用电信网(PTN);规范、功能模型和信息流;呼叫入侵补充业务
Contains stages 1 and stage 2 description of the intrusion supplementary service. See ECMA DTR/ECMA-0002 (ECMA-TR/SVC) for a description of the intrusion supplementary service. See ENv 41 005 for definition of stages 1 and 2.