ISO IEC 15992 pdf download Information technology — Telecommunications and information exchange between systems — Private Integrated Services Network — Inter-exchange signalling protocol — Call Priority Interruption and Call Priority Interruption Protection supplementary services 1.Scope This lnternational Standard specifies the signalling protocol for the support of the Call Priority Interruption (SS-CPI) and CallPriority Interruption Protection (SS-CPIP) supplementary services at the...