Stage 2 Description for Charging Supplementary Services Clause 3 - Reverse Charging (REV) - General Recommendations on Telephone Switching and Signalling Functions and Information Flows for Services in the ISDN Study Group XI
This Recommendation defines the Stage 2 of the Integrated Services Digital Network (ISDN) as provided by thetelecommunications operators for the Reverse Charging (REV) supplementary service. Stage 2 identifies the functionalcapabilities and the information flows needed to support the service description. The Stage 2 description also identifies user operations not directly associated with a call (see Recommendation I.130 [1]).