DIN EN 300364:2004
专用综合业务网.局间信令协议.免打扰和免打扰补偿补充业务
Private Integrated Services Network (PISN) - Inter-exchange signalling protocol - Do not disturb and do not disturb override supplementary services (ISO/IEC 14844 (2003), modified) (Endorsement of the English version EN 300364 V1.3.1 (2004-01) as German s