scope:

During any phase of a voice or video call, the Online Charging System (OCS) or Converged Charging System (CCS)may need to deliver billing/charging in-session notifications to the end user via announcements as part of the rating, balance management and billing process. For example, the CCS/OCS may need to inform the user about usage states, threshold crossings, offer statuses, reason for call rejection, alerts about low balances, etc.

Such notifications can be delivered pre-, mid- or post-call.

The Announcement service in the present document provides announcement capabilities for use in a Diameter based online or converged charging session. The CCS/OCS is able to specify that a given announcement be played to a call party in order to deliver charging/billing related notifications.