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  2. Call-recording software - Wikipedia

    en.wikipedia.org/wiki/Call-recording_software

    Call recording software records telephone conversations over PSTN or VoIP in a digital audio file format. Call recording is distinct from call logging and tracking , which record details about the call but not the conversation; however, software may include both recording and logging functionality.

  3. 1-800-FREE-411 - Wikipedia

    en.wikipedia.org/wiki/1-800-FREE-411

    Callers then identify the city and state for the desired information, and can then search either by name or by business type. Free directory assistance is also available from an application for the iPhone and Android mobile phones, [2] and from their website. The service, provided entirely by computer and with no human operators, uses a voice ...

  4. Psophometer - Wikipedia

    en.wikipedia.org/wiki/Psophometer

    The core of the meter is based on a true RMS voltmeter, which measures the level of the noise signal. This was used for the first psophometers, in the 1930s. [2] As the human-perceived level of noise is more important for telephony than their raw voltage, a modern psophometer incorporates a weighting network to represent this perception.

  5. Directory assistance - Wikipedia

    en.wikipedia.org/wiki/Directory_assistance

    Toll-free directory assistance was provided by telecommunication providers, namely AT&T and Verizon, as mandated by the Federal Communications Commission. Companies requested to have their toll-free number listed, and paid the providers each time their phone number was released to a toll-free directory-assistance caller.

  6. Blue box - Wikipedia

    en.wikipedia.org/wiki/Blue_box

    The called office interpreted this tone as the caller hanging up before the call completed, disconnected the call, and began playing 2600 Hz to mark the line free. However, this did not disconnect the call at the caller's end, but instead would leave the caller on a live line that was connected via a long-distance trunk line to a target exchange.

  7. Echo suppression and cancellation - Wikipedia

    en.wikipedia.org/wiki/Echo_suppression_and...

    During the call setup and negotiation period, both modems send a series of unique tones and then listen for them to return through the phone system. They measure the total delay time, then configure a delay line for that same period. Once the connection is completed, they send their signals into the phone lines as normal, but also into the ...

  8. Did your cell phone make a screeching noise today? Here’s why

    www.aol.com/america-national-emergency-alert...

    Essentially, what this means is that hundreds of millions of cell phones around the country made a screeching alert noise at approximately the same time today, beginning around 2:20 pm ET.

  9. Call management - Wikipedia

    en.wikipedia.org/wiki/Call_management

    A call detail record or call recording software is used to record all received calls, including time, date, duration, calling number and called number for future reference. [ 4 ] Interactive voice response is a sound recording device that allows a caller to give information to a system verbally about what services or support they require.