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  2. Off-hook tone - Wikipedia

    en.wikipedia.org/wiki/Off-hook_tone

    Some central office switches in the United States, notably older GTD-5 EAX systems, utilize a single frequency tone, 480 Hz, known as High Tone for this purpose. In either case, the tone is substantially louder than any other signal transmitted over a copper POTS circuit; loud enough to be heard across a room from an unused off-hook telephone.

  3. Voice-operated switch - Wikipedia

    en.wikipedia.org/wiki/Voice-operated_switch

    It is usually used to turn on a transmitter or recorder when someone speaks and turn it off when they stop speaking. It is used instead of a push-to-talk button on transmitters or to save storage space on recording devices. On cell phones, it is used to save battery life. Intercom systems that use a speaker in a room as both a speaker and a ...

  4. List of SIP response codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SIP_response_codes

    The server is undergoing maintenance or is temporarily overloaded and so cannot process the request. A "Retry-After" header field may specify when the client may reattempt its request. [1]: §21.5.4 504 Server Time-out The server attempted to access another server in attempting to process the request, and did not receive a prompt response.

  5. Handsfree - Wikipedia

    en.wikipedia.org/wiki/Handsfree

    Hands-free phone kit fitted to a Saab 9-5.. Handsfree is an adjective describing equipment that can be used without the use of hands (for example via voice commands) or, in a wider sense, equipment which needs only limited use of hands, or for which the controls are positioned so that the hand can occupy themselves with another task (such as driving) without needing to hunt far afield for the ...

  6. Troubleshoot a dial-up connection - AOL Help

    help.aol.com/articles/troubleshooting-a-dial-up...

    Restart your computer and modem - Sometimes the old "turn it off and on again" approach actually does work! Just wait about five minutes before turning it back on to make sure everything was reset. Check if you can visit other sites with a different browser - The problem may be associated the browser you're using.

  7. List of Bluetooth profiles - Wikipedia

    en.wikipedia.org/wiki/List_of_Bluetooth_profiles

    1.3 — all of 1.0 plus metadata and media-player state support [7] The status of the music source (playing, stopped, etc.) Metadata information on the track itself (artist, track name, etc.). 1.4 — all of 1.3 plus media browsing capabilities for multiple media players [8] Browsing and manipulation of multiple players

  8. Echo suppression and cancellation - Wikipedia

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

    Today's telephony technology often employs echo cancellers in small or handheld communications devices via a software voice engine, which provides cancellation of either acoustic echo or the residual echo introduced by a far-end PSTN gateway system; such systems typically cancel echo reflections with up to 64 milliseconds delay.

  9. Camp-on busy signal - Wikipedia

    en.wikipedia.org/wiki/Camp-on_busy_signal

    In telecommunications, the term camp-on busy signal has the following meanings: . A signal that informs a busy telephone user that another call originator is waiting for a connection.