International call progress tones for IP-PBX and VoIP telephony

Telephone Line Signalling

Pay tone

  • 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.

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Related product: CPT-Master tone generator app