This Recommendation describes the adaptation of the narrow-band ISDN User Part (ISUP) for the support of narrow-band ISDN services independent of the bearer technology and signalling message transport technology used. This Recommendation is written as a set of exceptions to the ISUP Recommendations. The exceptions to certain sections of text from the ISUP Recommendations are indicated by using revision marks. (Deleted text is shown using strikeouts, and added text is shown underlined.) The protocol defined by this Recommendation is the call control protocol to be used between "Serving Nodes". This protocol is called the "Bearer Independent Call Control" protocol, (BICC). Between Serving Nodes the control of bearers is provided by other protocols - not specified by this Recommendation