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  2. iPhone hardware - Wikipedia

    en.wikipedia.org/wiki/IPhone_hardware

    The top and side of an iPhone 5S, externally identical to the SE (2016).From left to right, sides: wake/sleep button, silence switch, volume up, and volume down. The touchscreen on the iPhone has increased in size several times over the years, from 3.5 inches on the original iPhone to iPhone 4S, to the current 6.1 and 6.9 inches on the iPhone 16 and 16 Pro Max series. [1]

  3. Call-progress tone - Wikipedia

    en.wikipedia.org/wiki/Call-progress_tone

    The high frequencies may be the same volume as – or louder than – the low frequencies when sent across the line. The loudness difference between the high and low frequencies can be as large as 3 decibels (dB) and is referred to as "twist." The duration of the tone should be at least 537 ms. [1]

  4. Automatic call distributor - Wikipedia

    en.wikipedia.org/wiki/Automatic_call_distributor

    An automated call distribution system, commonly known as automatic call distributor or automatic call dispatcher (ACD), is a telephony device that answers and distributes incoming calls to a specific group of terminals or agents within an organization. ACDs direct calls based on parameters that may include the caller's telephone number, the ...

  5. Hayes AT command set - Wikipedia

    en.wikipedia.org/wiki/Hayes_AT_command_set

    Answer incoming call A/ Repeat last command Do not preface with AT, do not follow with carriage return. Enter usually aborts. D: Dial Dial the following number and then handshake. P – Pulse Dial T – Touch Tone Dial W – Wait for the second dial tone R – Reverse to answer-mode after dialing @ - Wait for up to 30 seconds for one or more ...

  6. Call waiting - Wikipedia

    en.wikipedia.org/wiki/Call_waiting

    Call waiting is a telephone service where a subscriber can accept a second incoming telephone call by placing an in-progress call on hold—and may also switch between calls. With some providers it can be combined with additional features such as conferencing, call forwarding, and caller ID. Call waiting is intended to alleviate the need to ...

  7. Voice over LTE - Wikipedia

    en.wikipedia.org/wiki/Voice_over_LTE

    VoLTE calling. Voice over Long-Term Evolution (acronym VoLTE) is an LTE high-speed wireless communication standard for voice calls and SMS using mobile phones and data terminals. [1] [2] VoLTE has up to three times more voice [3] and data capacity than older 3G UMTS and up to six times more than 2G GSM.

  8. List of Bluetooth profiles - Wikipedia

    en.wikipedia.org/wiki/List_of_Bluetooth_profiles

    Support for Absolute volume; 1.5 — all of 1.4 plus specification corrections and clarifications to absolute volume control, browsing and other features [9] 1.6 — all of 1.5 plus browsing data and track information [10] Number of items that are in a folder without downloading the list

  9. Radio receiver - Wikipedia

    en.wikipedia.org/wiki/Radio_receiver

    [20] [9] In an AM receiver, the amplitude of the audio signal from the detector, and the sound volume, is proportional to the amplitude of the radio signal, so fading causes variations in the volume. In addition as the receiver is tuned between strong and weak stations, the volume of the sound from the speaker would vary drastically.