Private Integrated Services Network (PISN);Inter-exchang
e signalling protocol;Circuit mode basic services;Network Layer (NL);Part 2: Abstract Test Suite (ATS) specification (Endorsed by Asociación Española de Normalización in January of 2023.)
Private Integrated Services Network (PISN);Inter-exchange signalling protocol;Circuit mode basic services;Network Layer (NL);Part 2: Abstract Test Suite (ATS) specification (Endorsed by Asociación Española de Normalización in January of 2023.)
