Private Integrated Services Network (PISN) - Inter-exchange signalling protocol - Call offer supplementary service - Part 1: Test Suite Structure and Test Purposes (TSS&TP) specification
Private Integrated Services Network (PISN) - Inter-exchange signalling protocol - Call offer supplementary service - Part 2: Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma specification (incl. Diskette!!!)
