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2. Comparison of VoIP software - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_VoIP_software

   This is a comparison of voice over IP ( VoIP) software used to conduct telephone -like voice conversations across Internet Protocol (IP) based networks. For residential markets, voice over IP phone service is often cheaper than traditional public switched telephone network (PSTN) service and can remove geographic restrictions to telephone ...

3. Voice over IP - Wikipedia

   en.wikipedia.org/wiki/Voice_over_IP

   Full-service VoIP phone companies provide inbound and outbound service with direct inbound dialing. Many offer unlimited domestic calling and sometimes international calls for a flat monthly subscription fee. Phone calls between subscribers of the same provider are usually free when flat-fee service is not available.

4. Asterisk (PBX) - Wikipedia

   en.wikipedia.org/wiki/Asterisk_(PBX)

   Some sites are using Asterisk to replace proprietary PBXes, others provide additional features, such as voice mail or voice response menus, or virtual call shops, or to reduce cost by carrying both local and long-distance calls over the Internet.

5. Zoom (software) - Wikipedia

   en.wikipedia.org/wiki/Zoom_(software)

   The feature is available across all Zoom accounts, including free ones. In September 2021 at Zoomtopia, the company announced that end-to-end encryption would now be available as an upgrade for Zoom Phone users.

6. Telehealth - Wikipedia

   en.wikipedia.org/wiki/Telehealth

   Telepsychiatry or telemental health refers to the use of telecommunications technology (mostly videoconferencing and phone calls) to deliver psychiatric care remotely for people with mental health conditions. It is a branch of telemedicine.

7. Telephone exchange - Wikipedia

   en.wikipedia.org/wiki/Telephone_exchange

   A telephone operator manually connecting calls with cord pairs at a telephone switchboard. A modern central office, equipped with voice communication and broadband data capabilities. A telephone exchange, also known as a telephone switch or central office, is a crucial component in the public switched telephone network (PSTN) or large ...