International call progress tones for IP-PBX and VoIP telephony
Telephone Line Signalling
Call waiting tone
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- A tone advising the user of the call waiting supplementary service who is engaged on a call that someone is attempting to call his number.
- Typically, the call waiting tone is a slow period tone, where the On period is shorter than the Off period.
- Implementations vary, but typically, a single or double beep is sent every few seconds.