International call progress tones for IP-PBX and VoIP telephony

Telephone Line Signalling

Warning tone

  • End of period - A tone provided to the paying party for a call to indicate that the period for which payment has been credited will soon expire.
  • Operator intervening - A tone warning participants in a call that privacy of the conversation has been breached by the intervention of an operator.
  • Pip tone - A tone provided to the paying party for a call to indicate that expiry of the period for which payment has been credited is imminent.
  • Recorder warning - A tone warning participants in a call that the conversation is being recorded.

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Related product: CPT-Master tone generator app