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International call progress tones for IP-PBX and VoIP telephony
Telephone Line Signalling
Trunk offering 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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Trunk offering tones
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CPT-Master
tone generator app
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