This Recommendation describes the functional requirements and configurations across interfaces for interworking between Frame Relaying Bearer Services (FRBS) and other services. The interworking arrangements covered in this Recommendation are: interworking between Frame Relaying and Frame Switching bearer services; interworking between FRBS and Recommendation X.25/X.31; interworking/interconnection of LANs and FRBS; interworking between FRBS and circuit-switched services; and interworking between FRBS and B-ISDN.