ISO IEC 23289 pdf download.Information technology — Telecommunications and information exchange between systems — Corporate telecommunication networks 1 Scope This International Standard specifies signalling interworking between “QSIG” and “H.323” in support of basic services within a corporate telecommunication network (CN). “QSIG” is a signalling protocol that operates at the Q reference point between Private Integrated services Network eXchange (PINX) within...