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  2. Disconnect tone - Wikipedia

    en.wikipedia.org/wiki/Disconnect_tone

    Reproduction of an iOS phone disconnect tone (not the original audio) A disconnect tone in telephony is a tone provided to the remaining party to a call after the remote party hangs up. [ 1 ] [ 2 ] Typically, the disconnect tone is a few cycles of the reorder , busy , or the off-hook tone (e.g. in US), or between five and fifteen seconds of the ...

  3. Intercept message - Wikipedia

    en.wikipedia.org/wiki/Intercept_message

    A message may also be played when 0 or 1 followed by an area code is prepended unnecessarily on landline phone calls to local destinations. As of 2021, area code dialing is required in multi area code areas even for local calls, making the "not necessary to dial a 1 or 0" message no longer relevant for some areas.

  4. Special information tone - Wikipedia

    en.wikipedia.org/wiki/Special_information_tone

    The equipment can then make an intelligent choice about what to do next. If the circuits were busy, then calling again later makes sense; if the number was disconnected, then calling again is futile. As an alternative to the in-band SIT tone and recording, SS7 allows call progress advisories to be played/displayed to callers in their own language.

  5. TeleZapper - Wikipedia

    en.wikipedia.org/wiki/Telezapper

    On detecting a ring and answer of any phone on the line, the Telezapper will immediately play a sequence of Special information tones or "SIT": one of eight internationally standardized signals that indicate a call cannot be completed. Typically the "Intercept" or "IC" SIT is used, indicating the number called has been disconnected or changed.

  6. Call-progress tone - Wikipedia

    en.wikipedia.org/wiki/Call-progress_tone

    August 2024) (Learn how and when to remove this message) In telephony , call progress tones are audible tones that provide an indication of the status of a telephone call to the user. The tones are generated by a central office or a private branch exchange (PBX) to the calling party .

  7. Busy signal - Wikipedia

    en.wikipedia.org/wiki/Busy_signal

    A busy signal (or busy tone or engaged tone) in telephony is an audible call-progress tone or audible signal to the calling party that indicates failure to complete the requested connection of that particular telephone call.

  8. Audio converter - Wikipedia

    en.wikipedia.org/wiki/Audio_converter

    February 2024) (Learn how and when to remove this message) An audio converter is a software or hardware tool that converts audio files from one format to another. This process is often necessary when users encounter compatibility issues with different devices, applications, or platforms that support specific audio file formats.

  9. DTMF - Wikipedia

    en.wikipedia.org/wiki/DTMF

    Autovon keypads were one of the few production units to include all 16 DTMF signals. The red keys in the fourth column produce the A, B, C, and D DTMF events. Before the development of DTMF, telephone numbers were dialed by users with a loop-disconnect (LD) signaling, more commonly known as pulse dialing (dial pulse, DP) in the United States.