International call progress tones for IP-PBX and VoIP telephony
Telephone Line Signalling
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- Also known as the Acceptance tone, Function acknowledge tone, Positive indication tone and the Service activated tone.
- A tone used to indicate that an exchange has received information from an access line or has processed a request received from an access line, such as the activation/deactivation of line services.
- It may also indicate that an interrogated service is active.