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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