International call progress tones for IP-PBX and VoIP telephony
Telephone Line Signalling
Search for Pay tones in the World Tone Database Back to guide
- A tone advising users of a payphone that a payment is required.
- Typically, the pay 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.