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Telephone line signalling

  • Billing (metering) signal
  • Billing pulses are used with payphones and call metering systems.
  • Unlike "Pay tones", these signals are intended for the equipment, not for the user.
  • Also known as the Billing pulse, Metering pulse and Tax pulse.

  • Country Frequency/Level/Duration
    Australia, Austria, Cameroon, Central African Republic, Côte d'Ivoire, Denmark, France, Ireland, Italy, Malta, Portugal, Rwanda, Spain, Sweden, Switzerland, Tunisia, Turkey 12kHz/~2Vrms, differential/~125ms
    Belgium, Czech Republic, Estonia, Finland, Germany, Greece, Israel, Lesotho, Norway, Slovakia, Yugoslavia 16kHz/~2Vrms, differential/~125ms
    Great Britain, Netherlands 50Hz/~50Vrms, longitudinal/~160ms