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  2. Talkatone - Wikipedia

    en.wikipedia.org/wiki/Talkatone

    Over time, the app evolved to provide users with its own free phone numbers and the ability to make free calls and send texts to most phone number in the United States and Canada. [2] In May 2014, Talkatone was acquired by Ooma, [6] [7] a company known for its VoIP services and home and office phone solutions.

  3. Call-progress tone - Wikipedia

    en.wikipedia.org/wiki/Call-progress_tone

    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. In this case the ringing state is sent by the host network and the tone is generated by the home network.

  4. Google Voice - Wikipedia

    en.wikipedia.org/wiki/Google_Voice

    Google provides free PC-to-PC voice calling worldwide. As described above, Google Voice users in many countries may make low-cost calls to international phone numbers, and currently may also make free PC-to-phone calls within the United States and Canada. Vincent Paquet, a co-founder of GrandCentral who became a senior product manager at Google ...

  5. International call - Wikipedia

    en.wikipedia.org/wiki/International_call

    The calls were transmitted by cable, communications satellite, radio, and more recently, fiber optics and Voice over Internet Protocol (VoIP). International direct dialling was introduced in the 1970s, so calls can be dialed by country code without an operator. International calls can be paid via telephone card (aka phone

  6. Ringing tone - Wikipedia

    en.wikipedia.org/wiki/Ringing_tone

    Ringing tone (audible ringing, also ringback tone) is a signaling tone in telecommunication that is heard by the originator of a telephone call while the destination terminal is alerting the receiving party. The tone is typically a repeated cadence similar to a traditional power ringing signal (ringtone), but is

  7. Dial tone - Wikipedia

    en.wikipedia.org/wiki/Dial_tone

    A dial tone (dialling tone in the UK) is a telephony signal sent by a telephone exchange or private branch exchange (PBX) to a terminating device, such as a telephone, when an off-hook condition is detected. It indicates that the exchange is working and is ready to initiate a telephone call. The tone stops when the first dialed digit is recognized.

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