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  2. Call-progress tone - Wikipedia

    en.wikipedia.org/wiki/Call-progress_tone

    Mobile phones roaming on a foreign network will often be provided with a ringback tone from the network they are temporarily hosted on. For example, calling a US phone in Europe may return a European ringback tone or vice versa. Increasingly, networks may opt to play their own domestic tones instead, making roaming seamless.

  3. List of codecs - Wikipedia

    en.wikipedia.org/wiki/List_of_codecs

    1.3.4.3 Mobile phone. 1.3.4.3.1 Generation 2. ... Download QR code; Print/export ... is the format for uncompressed audio in media files and it is also the ...

  4. Interactive voice response - Wikipedia

    en.wikipedia.org/wiki/Interactive_voice_response

    In telecommunications, an audio response unit (ARU) (often included in IVR systems) is a device that provides synthesized voice responses to DTMF keypresses by processing calls based on (a) the call-originator input, (b) information received from a database, and (c) information in the incoming call, such as the time of day. ARUs increase the ...

  5. Adaptive Multi-Rate audio codec - Wikipedia

    en.wikipedia.org/wiki/Adaptive_Multi-Rate_audio...

    The Adaptive Multi-Rate (AMR, AMR-NB or GSM-AMR) audio codec is an audio compression format optimized for speech coding. AMR is a multi-rate narrowband speech codec that encodes narrowband (200–3400 Hz) signals at variable bit rates ranging from 4.75 to 12.2 kbit/s with toll quality [ 3 ] speech starting at 7.4 kbit/s.

  6. Comparison of audio coding formats - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_audio_coding...

    Bluetooth audio Yes No No Yes No LHDC: Savitech 2017 5.0.6 (2022-08-03) Non-free Mobile phones, Bluetooth headphones, Home receivers Android 10: Bluetooth audio Yes No Yes Yes No L2HC Huawei: 2020 3.0 (2023-09-19) Non-free Huawei products, EMUI, HarmonyOS: Android 10, OpenHarmony, Oniro OS Bluetooth audio NearLink audio Yes Yes Yes Yes Yes Lyra ...

  7. Dialog K35 - Wikipedia

    en.wikipedia.org/wiki/Dialog_K35

    The Dialog K35 is a dual-SIM slate smartphone operating on the Android platform, originally designed and developed by Innos in China and subsequently marketed by Dialog Axiata in Sri Lanka. Equipped with a 1 GHz Broadcom CPU and 512 MB of RAM , the device delivers reliable performance.

  8. Dial tone - Wikipedia

    en.wikipedia.org/wiki/Dial_tone

    A soft dial tone or express dial tone may be used when no actual service is active on a line, and normal calls cannot be made. It is maintained only so that an attached phone can dial the emergency telephone number (such as 911, 112 or 999), in compliance with the law in most places.

  9. Blue box - Wikipedia

    en.wikipedia.org/wiki/Blue_box

    I called only to explore the phone company as a system, to learn the codes and tricks. I'd talk to the London operator, and convince her I was a New York operator. When I called my parents and my friends, I paid.