ITU X.625:1996
ITU X.625:1996 Information Technology - Protocol For Providing The Connectionless-mode Network Service: Provision Of The Underlying Service By Isdn Circuit-switched B-channels Specifies the way in which the underlying service assumed by the protocol defined by ITU-T Rec. X.223/ISO/IEC 8473-1 is provided by a subnetwork that conforms to Recommendation Q.931 through the opera