International call progress tones for IP-PBX and VoIP telephony

Telephone Line Signalling

Busy override warning tone

  • Also known as the Busy override warning tone, Busy verification tone and the Trunk offering tone.
  • A tone advising participants during a call that the privacy of the conversation has been breached, e.g. by the intervention of an operator.

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Related product: CPT-Master tone generator app