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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. Command mode and Data mode - Wikipedia

    en.wikipedia.org/wiki/Command_mode_and_Data_mode

    For example, a DLE followed by the number 2 means the caller pressed the number 2 on his telephone keypad. This could happen in either command or data mode so long as the phone line is in use by the modem and someone is on the other end of the line. The DLE character could appear in fax or audio data.

  4. AOL Dialer: Fix common problems - AOL Help

    help.aol.com/articles/aol-dialer-fix-common-problems

    Dialing *70 can prevent the call from completing when the phone line does not have the call waiting feature active. Leave this option unchecked if you are no longer able to connect. 3. Check or uncheck, “I have to dial this number to reach an outside line” depending on your telephone line. Normally, this should not be selected.

  5. 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.)

  6. Special information tone - Wikipedia

    en.wikipedia.org/wiki/Special_information_tone

    Like a dial tone or busy signal, the SIT is an in-band signal intended both to be heard by the caller, and to be detected by automated dialing equipment to determine a call has failed. In North America, the AT&T/Bellcore SIT standard allows the frequency and duration of the tones to vary slightly - making eight distinct messages specifically ...

  7. On- and off-hook - Wikipedia

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

    On an ordinary two-wire telephone line, off-hook status is communicated to the telephone exchange by a resistance short across the pair. When an off-hook condition persists without dialing, for example because the handset has fallen off or the cable has been flooded, it is treated as a permanent loop or permanent signal.

  8. 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. The busy signal has become less common in the past few decades due to the prevalence of call waiting and voicemail.

  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.

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