- Private Integrated Services Network (PISN) - Inter-Exchange Signalling Protocol - Call Diversion Supplementary Services (QSIG-CF),
International and European Versions: ISO/IEC 13873, ETSI ETS 300 257
* ECMA-178 - Private Integrated Services Network (PISN) - Inter-Exchange Signalling Protocol - Call Transfer Supplementary Service (QSIG-CT),
International and European Versions: ISO/IEC 13869, ETSI ETS 300 261

Source : (search the list for PISN to find all QSIG related standards at ECMA)

QSIG basically

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