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• ITU-T Rec. D.35 (11/1988) GENERAL CHARGING AND ACCOUNTING PRINCIPLES IN THE INTERNATIONAL PUBLIC INTERPERSONAL MESSAGING (IPM) SERVICE
• Preamble
• 1 Collection charges
  • 1.1 Basic IPM service (as defined in Recommendation F.400)
  • 1.2 IPM service optional user facilities (as defined in Recommendation F.400)
• 2 International accounting
  • 2.1 Basic IPM service
  • 2.2 IPM service optional user facilities