UNE-ETS 300366 Ed2:2022 Private Integrated Services Network (PISN);Inter-exchange signalling protocol;Call completion supplementary services [ISO/IEC 13870 (1995) modified] (Endorsed by Asociación Española de Normalización in July of 2022.)
2022UNE-ETS 300366 Ed2:2022 Private Integrated Services Network (PISN);Inter-exchange signalling protocol;Call completion supplementary services [ISO/IEC 13870 (1995) modified] (Endorsed by Asociación Española de Normalización in July of 2022.)
2022UNE-ETS 300366 Ed1:2022 Private Telecommunication Network (PTN);Inter-exchange signalling protocol ;Call completion supplementary services (Endorsed by Asociación Española de Normalización in July of 2022.)