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  2. Call-progress tone - Wikipedia

    en.wikipedia.org/wiki/Call-progress_tone

    Telecommunication equipment such as fax machines and modems are designed to recognize certain tones, such as dial tone and busy tone. The ITU-T E.180 and E.182 recommendations define the technical characteristics and intended usage of some of these tones. ToneScript is a tone description format that may be used to specify the tone.

  3. On- and off-hook - Wikipedia

    en.wikipedia.org/wiki/On-_and_Off-hook

    One of two possible signaling states, such as tone or no tone, or ground connection versus battery connection. Note: if on-hook pertains to one state, off-hook pertains to the other. The idle state, i.e., an open loop of a subscriber line or PBX user loop.

  4. Intercept message - Wikipedia

    en.wikipedia.org/wiki/Intercept_message

    In the past, the call would be forwarded to an intercept operator after usually two readings of the message; today, however, this procedure is not observed, and on some systems a fast busy signal follows the second reading of the message instead. (A busy or an Off-Hook may be used depending on the provider.)

  5. Disconnect tone - Wikipedia

    en.wikipedia.org/wiki/Disconnect_tone

    [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 Number Unobtainable tone (e.g. in UK). On some telephone exchanges in the UK, the following audio message is looped for fifteen seconds, interspersed with special information tones (SIT), to ...

  6. Busy signal - Wikipedia

    en.wikipedia.org/wiki/Busy_signal

    In the United Kingdom, the busy tone is a single 400 Hz tone with equal 0.375 s on/off periods. This was the case even when the UK was still part of the EU. The current 400 Hz/375ms tone was adopted in the mid-to-late 1960s and replaced the older busy tone, which was the same 400 Hz signal but at half the pulse duration, 0.75 s on, 0.75 s off.

  7. Hayes AT command set - Wikipedia

    en.wikipedia.org/wiki/Hayes_AT_command_set

    A list of Hayes AT commands Archived 2008-07-10 at the Wayback Machine; 3gpp.org, 3GPP AT command set for User Equipment; Modem initialisation string Archived 2009-03-10 at the Wayback Machine; Extended Hayes AT command parameters for SMS (dead) Determining your Class of Fax / Modem; Openmoko: AT Commands

  8. Why do teens say, ‘Fax, No Printer’? - AOL

    www.aol.com/news/why-teens-fax-no-printer...

    There’s more to “Fax, no printer.” According to Know Your Meme, TikTok creator @Briaalanaa stated “Copy, no translate” in a 2021 video: “Hey yo! The person that sent you this wants you ...

  9. Reorder tone - Wikipedia

    en.wikipedia.org/wiki/Reorder_tone

    The reorder tone, also known as the fast busy tone, or the congestion tone, or all trunks busy (ATB) tone is an audible call progress tone in the public switched telephone network (PSTN) that is returned to a calling party to indicate that the call cannot be processed through the network.