ITU-T-Q-SERIES

ITU-T telecom signalling recommendations.

Definition

Q.700 series Signalling System 7 (SS7) heritage. Q.931 ISDN Layer 3 signalling. Q.1900 series Bearer Independent Call Control (BICC). Progressive migration toward IETF SIP/RTP for modern VoIP. ITU-T based in Geneva, ~200 member countries. Permanent UN member. Close cooperation with IETF, IEEE, 3GPP.

Origin

ITU founded 1865 (first UIT Paris treaty) ; ITU-T created 1992 by CCITT (since 1956) merger.

Example in context

An enterprise VoIP provider uses ITU-T compliant SIP (Q.1900) ; inter-operator signalling via SBC (Session Border Controller).

Related terms

• IETF — Internet twin.