Integrated Services Digital Network (ISDN); Advice of Charge (AOC) Supplementary Service; Digital Subscriber Signalling System No. One (DSS1) Protocol; Part 1: Protocol Specification (V1.3.3)
This first part of EN 300 182 specifies the stage three of the Advice of Charge (AOC) supplementary service for the pan- European Integrated Services Digital Network (ISDN) as provided by European public telecommunications operators at the T reference point or coincident S and T reference point (as defined in CCITT Recommendation I.411 [1]) by means of the Digital Subscriber Signalling System No. one (DSS1). Stage three identifies the protocol procedures and switching functions needed to support a telecommunications service (see CCITT Recommendation I.130 [2]). In addition@ the present document specifies the protocol requirements at the T reference point where the service is provided to the user via a private ISDN. The present document does not specify the additional protocol requirements where the service is provided to the user via a telecommunications network that is not an ISDN. Three AOC supplementary services exist: a) Charging information at call set-up time (AOC-S) The AOC-S supplementary service enables a user to receive information about the charging rates at call set-up time and also to receive further information during the call if there is a change of charging rates. b) Charging information during the call (AOC-D) The AOC-D supplementary service enables a user to receive information on the recorded charges for a call during the active phase of the call. c) Charging information at the end of the call (AOC-E) The AOC-E supplementary service enables a user to receive information on the recorded charges for a call when the call is terminated. The AOC supplementary service is applicable to all circuit-switched telecommunication services. Further parts of the present document specify the method of testing required to identify conformance to the present document. The present document is applicable to equipment@ supporting the AOC supplementary service@ to be attached at either side of a T reference point or coincident S and T reference point when used as an access to the public ISDN.