The standard specifies the procedures for the establishing, maintaining and clearing of network connections at the ISDN user-network interface. These procedures are defined in terms of messages exchanged over the D-channel of basic and primary rate interface structure. The functions and procedures of this protocol, and the relationship with other layers, are described in general terms in CCITT.Recommendation Q.930.
DS/ETS 300102-1/A2:1995 history
1998DS/ETS 300102-1/A1:1998 Integrated Services Digital Network (ISDN) - User-network interface layer 3 - Specifications for basic call control
1995DS/ETS 300102-1/A2:1995 Integrated Services Digital Network (ISDN); User-network interface layer 3 - Specifications for basic call control
1993DS/ETS 300102-1:1993 Integrated Services Digital Network (ISDN); User-network interface layer 3. Specifications for basic call control