Information technology Telecommunications and information exchange between systems Private Integrated Services Network Specification, functional model and information flows Private User Mobility (PUM) Registration supplementary service ISO/IEC 17875
The Canadian Standards Association (CSA), under
whose auspices this National Standard has been produced,
was chartered in 1919 and accredited by the
Standards Council of Canada to the National Standards
system in 1973. It is a not-for-profit, nonstatu