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2. Virtual number - Wikipedia

   en.wikipedia.org/wiki/Virtual_number

   A virtual number, also known as direct inward dialing (DID) or access numbers, is a telephone number without a directly associated telephone line. Usually, these numbers are programmed to forward incoming calls to one of the pre-set telephone numbers, chosen by the client: fixed, mobile or VoIP.

3. FreeSWITCH - Wikipedia

   en.wikipedia.org/wiki/FreeSWITCH

   FreeSWITCH is a free and open-source telephony software for real-time communication protocols using audio, video, text and other forms of media. The software has applications in WebRTC, voice over Internet Protocol (VoIP), video transcoding, Multipoint Control Unit (MCU) functionality and supports Session Initiation Protocol (SIP) features.

4. List of TCP and UDP port numbers - Wikipedia

   en.wikipedia.org/wiki/List_of_TCP_and_UDP_port...

   This is a list of TCP and UDP port numbers used by protocols for operation of network applications. The Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) only need one port for duplex, bidirectional traffic. They usually use port numbers that match the services of the corresponding TCP or UDP implementation, if they exist.

5. Mumble (software) - Wikipedia

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

   Mumble (software) Mumble is a voice over IP (VoIP) application primarily designed for use by gamers and is similar to programs such as TeamSpeak. [5] Mumble uses a client–server architecture which allows users to talk to each other via the same server. [6] It has a very simple administrative interface and features high sound quality and low ...

6. Google Voice - Wikipedia

   en.wikipedia.org/wiki/Google_Voice

   Google Voice requires an existing "real" [non-VOIP] phone number and a generated PIN to register. However, many users simply employ one of numerous text verification websites to supply temporary "real" numbers.

7. Voice over IP - Wikipedia

   en.wikipedia.org/wiki/Voice_over_IP

   Voice over Internet Protocol (VoIP), [a] also called IP telephony, is a method and group of technologies for voice calls for the delivery of voice communication sessions over Internet Protocol (IP) networks, [2] such as the Internet.