This Recommendation describes the Stage 2 of the Reverse Charging supplementary service, supported by an ISDN. The Stage 2 descriptions are comprised of the switching functions and signalling information flows. The Reverse Charging supplementary service allows:
a) the calling user, on a per call basis, to request that the call be charged to the called party at call set-up time and the calling user has the opportunity to accept or reject these charges;
b) the calling user, on a per call basis, to request that the call be charged to the called party from a time during the active phase of the call and the called party has the opportunity to accept or reject those charges; and
c) the called user, on a per call basis, to request to be charged for the call from a time during the active phase.