| 摘要 |
An enhanced Calling Party Pays (CPP) or Paging Party Pays (PPP) system that enables 1) billing of calls originating from traditionally non-billable sources, 2) routing of incoming calls to voicemail if the caller does not wish to incur the additional charges, 3) allowing the caller to complete the call and charge the cellular (or paging) subscriber for additional air-time usage when the caller enters a PIN or security code, also referred to as a billing override code, and 4) allowing the caller to block CPP/PPP charges from being billed to the calling party
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