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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. List of mobile virtual network operators in the United States

   en.wikipedia.org/wiki/List_of_mobile_virtual...

   Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the three major cellular carriers in the country, AT&T Mobility, T-Mobile US, and Verizon. In 2016, MVNOs across the nation such as Metro PCS, Boost Mobile, Cricket Wireless, and Tracfone brands served about 36 million subscribers.

4. Linux - Wikipedia

   en.wikipedia.org/wiki/Linux

   Linux ( / ˈlɪnʊks / LIN-uuks) [11] is a family of open-source Unix-like operating systems based on the Linux kernel, [12] an operating system kernel first released on September 17, 1991, by Linus Torvalds.

5. Asterisk (PBX) - Wikipedia

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

   By supporting a variety of traditional and VoIP telephony services, Asterisk allows deployers to build telephone systems, or migrate existing systems to new technologies. 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 ...

6. 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.

7. VMOS (software) - Wikipedia

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

   VMOS is a virtual machine app that runs on Android, which can run another Android OS as the guest operating system. Users can optionally run the guest Android VM as a rooted Android OS. The VMOS guest Android operating system has access to the Google Play Store and other Google apps.